From 1de5efa40a2c8f6eb4183b56093420f3bec84e30 Mon Sep 17 00:00:00 2001 From: "blink-so[bot]" <211532188+blink-so[bot]@users.noreply.github.com> Date: Tue, 16 Dec 2025 10:31:48 +0000 Subject: [PATCH 1/7] feat(scout-agent): add conversation compaction module Adds conversation compaction support to prevent context overflow errors. Features: - Token counting using ai-tokenizer with model-specific accuracy - Compaction tool (compact_conversation) for summarizing conversations - Warning message generation when approaching token limits - Context length error detection for various providers - Emergency compaction for when compaction request exceeds context Exports: - countConversationTokens - Count tokens in ModelMessage[] - shouldCompact - Check if compaction is needed - findCompactionSummary - Find existing compaction in messages - applyCompaction - Replace pre-compaction messages with summary - createCompactionTool - Create the compact_conversation tool - createCompactionWarningMessage - Generate warning message - isContextLengthError - Detect context overflow errors - calculateEmergencyCompactionConfig - Plan emergency compaction - createEmergencyCompactionMessage - Generate emergency request - prepareEmergencyCompactionMessages - Split messages for emergency Includes 21 tests covering all functionality. --- bun.lock | 24 +- packages/scout-agent/lib/compaction.test.ts | 352 +++++++++++++++++++ packages/scout-agent/lib/compaction.ts | 367 ++++++++++++++++++++ packages/scout-agent/lib/index.ts | 1 + packages/scout-agent/package.json | 1 + 5 files changed, 740 insertions(+), 5 deletions(-) create mode 100644 packages/scout-agent/lib/compaction.test.ts create mode 100644 packages/scout-agent/lib/compaction.ts diff --git a/bun.lock b/bun.lock index 51f8e99..6f72211 100644 --- a/bun.lock +++ b/bun.lock @@ -1,6 +1,5 @@ { "lockfileVersion": 1, - "configVersion": 0, "workspaces": { "": { "name": "blink-repo", @@ -265,6 +264,7 @@ "@blink-sdk/multiplexer": "^0.0.1", "@blink-sdk/slack": "^1.1.2", "@octokit/webhooks": "^14.1.3", + "ai-tokenizer": "^1.0.6", "exa-js": "^2.0.3", }, "devDependencies": { @@ -394,7 +394,7 @@ "@ai-sdk/provider": ["@ai-sdk/provider@2.0.0", "", { "dependencies": { "json-schema": "^0.4.0" } }, 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@@ -0,0 +1,352 @@ +import { describe, expect, test } from "bun:test"; +import { APICallError } from "ai"; +import type { Message } from "./types"; +import { + COMPACT_CONVERSATION_TOOL_NAME, + applyCompaction, + calculateEmergencyCompactionConfig, + createCompactionTool, + createCompactionWarningMessage, + createEmergencyCompactionMessage, + findCompactionSummary, + isContextLengthError, + prepareEmergencyCompactionMessages, +} from "./compaction"; + +describe("compaction", () => { + describe("findCompactionSummary", () => { + test("returns null when no compaction exists", () => { + const messages: Message[] = [ + { + id: "1", + role: "user", + parts: [{ type: "text", text: "Hello" }], + }, + { + id: "2", + role: "assistant", + parts: [{ type: "text", text: "Hi there!" }], + }, + ]; + + expect(findCompactionSummary(messages)).toBeNull(); + }); + + test("finds compaction summary in assistant message", () => { + const messages: Message[] = [ + { + id: "1", + role: "user", + parts: [{ type: "text", text: "Hello" }], + }, + { + id: "2", + role: "assistant", + parts: [ + { + type: `tool-${COMPACT_CONVERSATION_TOOL_NAME}`, + state: "output-available", + output: { + summary: "This is the summary of the conversation.", + compacted_at: "2024-01-01T00:00:00.000Z", + }, + } as any, + ], + }, + { + id: "3", + role: "user", + parts: [{ type: "text", text: "Continue" }], + }, + ]; + + const result = findCompactionSummary(messages); + expect(result).not.toBeNull(); + expect(result?.index).toBe(1); + expect(result?.summary).toBe("This is the summary of the conversation."); + }); + + test("finds most recent compaction when multiple exist", () => { + const messages: Message[] = [ + { + id: "1", + role: "assistant", + parts: [ + { + type: `tool-${COMPACT_CONVERSATION_TOOL_NAME}`, + state: "output-available", + output: { summary: "First summary" }, + } as any, + ], + }, + { + id: "2", + role: "user", + parts: [{ type: "text", text: "More conversation" }], + }, + { + id: "3", + role: "assistant", + parts: [ + { + type: `tool-${COMPACT_CONVERSATION_TOOL_NAME}`, + state: "output-available", + output: { summary: "Second summary" }, + } as any, + ], + }, + ]; + + const result = findCompactionSummary(messages); + expect(result?.index).toBe(2); + expect(result?.summary).toBe("Second summary"); + }); + + test("ignores compaction tool in non-output-available state", () => { + const messages: Message[] = [ + { + id: "1", + role: "assistant", + parts: [ + { + type: `tool-${COMPACT_CONVERSATION_TOOL_NAME}`, + state: "input-available", + input: { summary: "Not yet complete" }, + } as any, + ], + }, + ]; + + expect(findCompactionSummary(messages)).toBeNull(); + }); + }); + + describe("applyCompaction", () => { + test("returns original messages when no compaction exists", () => { + const messages: Message[] = [ + { + id: "1", + role: "user", + parts: [{ type: "text", text: "Hello" }], + }, + ]; + + const result = applyCompaction(messages); + expect(result).toEqual(messages); + }); + + test("replaces messages before compaction with summary", () => { + const messages: Message[] = [ + { + id: "1", + role: "user", + parts: [{ type: "text", text: "Old message 1" }], + }, + { + id: "2", + role: "assistant", + parts: [{ type: "text", text: "Old response 1" }], + }, + { + id: "3", + role: "assistant", + parts: [ + { + type: `tool-${COMPACT_CONVERSATION_TOOL_NAME}`, + state: "output-available", + output: { summary: "Summary of old messages" }, + } as any, + ], + }, + { + id: "4", + role: "user", + parts: [{ type: "text", text: "New message" }], + }, + ]; + + const result = applyCompaction(messages); + + // Should have: summary message + compaction message + new message + expect(result.length).toBe(3); + + // First message should be the summary + expect(result[0].id).toBe("compaction-summary"); + expect(result[0].role).toBe("user"); + expect(result[0].parts[0].type).toBe("text"); + expect((result[0].parts[0] as { text: string }).text).toInclude( + "Summary of old messages" + ); + + // Should include messages from compaction point onwards + expect(result[1].id).toBe("3"); + expect(result[2].id).toBe("4"); + }); + }); + + describe("createCompactionTool", () => { + test("creates tool with correct name and schema", () => { + const tools = createCompactionTool(); + + expect(tools[COMPACT_CONVERSATION_TOOL_NAME]).toBeDefined(); + expect(tools[COMPACT_CONVERSATION_TOOL_NAME].description).toInclude( + "Compact the conversation history" + ); + }); + + test("tool execute returns summary in result", async () => { + const tools = createCompactionTool(); + const compactionTool = tools[COMPACT_CONVERSATION_TOOL_NAME]; + + const result = (await compactionTool.execute( + { summary: "Test summary content" }, + { abortSignal: new AbortController().signal } as any + )) as { summary: string; compacted_at: string; message: string }; + + expect(result.summary).toBe("Test summary content"); + expect(result.compacted_at).toBeDefined(); + expect(result.message).toInclude("compacted"); + }); + }); + + describe("createCompactionWarningMessage", () => { + test("creates warning message with token info", () => { + const message = createCompactionWarningMessage(80000, 100000); + + expect(message.id).toBe("compaction-warning"); + expect(message.role).toBe("user"); + const textPart = message.parts[0] as { text: string }; + expect(textPart.text).toInclude("80%"); + expect(textPart.text).toInclude("80,000"); + expect(textPart.text).toInclude("compact_conversation"); + }); + }); + + describe("isContextLengthError", () => { + test("returns false for null/undefined", () => { + expect(isContextLengthError(null)).toBe(false); + expect(isContextLengthError(undefined)).toBe(false); + }); + + test("detects context length exceeded in Error message", () => { + expect( + isContextLengthError(new Error("context length exceeded")) + ).toBe(true); + expect( + isContextLengthError(new Error("maximum context length reached")) + ).toBe(true); + expect(isContextLengthError(new Error("token limit exceeded"))).toBe( + true + ); + expect(isContextLengthError(new Error("too many tokens in request"))).toBe( + true + ); + expect(isContextLengthError(new Error("input too long"))).toBe(true); + expect(isContextLengthError(new Error("prompt too long"))).toBe(true); + expect(isContextLengthError(new Error("context_length_exceeded"))).toBe( + true + ); + }); + + test("detects context length error in string", () => { + expect(isContextLengthError("context length exceeded")).toBe(true); + expect(isContextLengthError("token limit exceeded")).toBe(true); + }); + + test("returns false for unrelated errors", () => { + expect(isContextLengthError(new Error("Network error"))).toBe(false); + expect(isContextLengthError(new Error("Rate limited"))).toBe(false); + expect(isContextLengthError("Something went wrong")).toBe(false); + }); + + test("detects APICallError with context length message", () => { + const apiError = new APICallError({ + message: "context length exceeded", + url: "https://api.example.com", + requestBodyValues: {}, + statusCode: 400, + responseBody: "error details", + }); + + expect(isContextLengthError(apiError)).toBe(true); + }); + + test("detects APICallError with context length in response body", () => { + const apiError = new APICallError({ + message: "Request failed", + url: "https://api.example.com", + requestBodyValues: {}, + statusCode: 400, + responseBody: '{"error": "context_length_exceeded"}', + }); + + expect(isContextLengthError(apiError)).toBe(true); + }); + }); + + describe("calculateEmergencyCompactionConfig", () => { + test("first attempt keeps 20% of messages (max 10)", () => { + const config = calculateEmergencyCompactionConfig(50); + + expect(config.totalMessages).toBe(50); + expect(config.recentMessagesToKeep).toBe(10); // 20% of 50, capped at 10 + }); + + test("first attempt with small message count", () => { + const config = calculateEmergencyCompactionConfig(20); + + expect(config.totalMessages).toBe(20); + expect(config.recentMessagesToKeep).toBe(4); // 20% of 20 + }); + + test("subsequent attempt reduces messages to summarize by half", () => { + const config = calculateEmergencyCompactionConfig(50, 10); + + // Previous attempt had 10 preserved, so 40 were summarized + // New attempt: summarize half of 40 = 20, keep 30 + expect(config.recentMessagesToKeep).toBe(30); + }); + + test("keeps at least 5 messages", () => { + const config = calculateEmergencyCompactionConfig(10, 8); + + expect(config.recentMessagesToKeep).toBeGreaterThanOrEqual(5); + }); + }); + + describe("createEmergencyCompactionMessage", () => { + test("creates message with correct counts", () => { + const config = { totalMessages: 50, recentMessagesToKeep: 10 }; + const message = createEmergencyCompactionMessage(config); + + expect(message.id).toBe("emergency-compaction-request"); + expect(message.role).toBe("user"); + const textPart = message.parts[0] as { text: string }; + expect(textPart.text).toInclude("first 40 messages"); + expect(textPart.text).toInclude("10 most recent"); + }); + }); + + describe("prepareEmergencyCompactionMessages", () => { + test("splits messages correctly", () => { + const messages: Message[] = Array.from({ length: 10 }, (_, i) => ({ + id: `${i + 1}`, + role: i % 2 === 0 ? "user" : "assistant", + parts: [{ type: "text", text: `Message ${i + 1}` }], + })) as Message[]; + + const config = { totalMessages: 10, recentMessagesToKeep: 3 }; + const { messagesToProcess, messagesToPreserve } = + prepareEmergencyCompactionMessages(messages, config); + + expect(messagesToProcess.length).toBe(7); + expect(messagesToPreserve.length).toBe(3); + + // Check that the split is correct + expect(messagesToProcess[0]!.id).toBe("1"); + expect(messagesToProcess[6]!.id).toBe("7"); + expect(messagesToPreserve[0]!.id).toBe("8"); + expect(messagesToPreserve[2]!.id).toBe("10"); + }); + }); +}); diff --git a/packages/scout-agent/lib/compaction.ts b/packages/scout-agent/lib/compaction.ts new file mode 100644 index 0000000..27d958a --- /dev/null +++ b/packages/scout-agent/lib/compaction.ts @@ -0,0 +1,367 @@ +import { tool, type ModelMessage, APICallError } from "ai"; +import { z } from "zod"; +import type { Message } from "./types"; + +/** + * Tool name for conversation compaction. + * Used to identify compaction tool results in message history. + */ +export const COMPACT_CONVERSATION_TOOL_NAME = "compact_conversation" as const; + +/** + * Default token threshold for triggering compaction. + */ +export const DEFAULT_TOKEN_THRESHOLD = 100_000; + +// Lazy-loaded tokenizer modules to avoid import issues +let tokenizerModule: typeof import("ai-tokenizer") | null = null; +let encodingModule: typeof import("ai-tokenizer/encoding/o200k_base") | null = + null; +let sdkModule: typeof import("ai-tokenizer/sdk") | null = null; + +async function getTokenizerModules() { + if (!tokenizerModule) { + tokenizerModule = await import("ai-tokenizer"); + encodingModule = await import("ai-tokenizer/encoding/o200k_base"); + sdkModule = await import("ai-tokenizer/sdk"); + } + return { tokenizerModule, encodingModule, sdkModule }; +} + +/** + * Get the model configuration for token counting. + * Defaults to Claude Sonnet if model not found. + */ +function getModelConfig(models: Record, modelName: string) { + // Try to find exact match first + if (modelName in models) { + return models[modelName]; + } + // Default to Claude Sonnet for Anthropic models + if (modelName.includes("anthropic") || modelName.includes("claude")) { + return models["anthropic/claude-sonnet-4"]; + } + // Default to GPT-5 for OpenAI models + if (modelName.includes("openai") || modelName.includes("gpt")) { + return models["openai/gpt-5"]; + } + // Fallback + return models["anthropic/claude-sonnet-4"]; +} + +/** + * Counts tokens for messages using ai-tokenizer. + */ +export async function countConversationTokens( + messages: ModelMessage[], + modelName: string = "anthropic/claude-sonnet-4" +): Promise { + const { tokenizerModule, encodingModule, sdkModule } = + await getTokenizerModules(); + if (!tokenizerModule || !encodingModule || !sdkModule) { + // Fallback to rough estimate if modules not loaded + const text = JSON.stringify(messages); + return Math.ceil(text.length / 4); + } + + const model = getModelConfig(tokenizerModule.models, modelName); + // biome-ignore lint/suspicious/noExplicitAny: dynamic import typing + const tokenizer = new tokenizerModule.Tokenizer(encodingModule as any); + + const result = sdkModule.count({ + // biome-ignore lint/suspicious/noExplicitAny: dynamic import typing + tokenizer: tokenizer as any, + // biome-ignore lint/suspicious/noExplicitAny: dynamic import typing + model: model as any, + messages, + }); + + return result.total; +} + +/** + * Checks if the conversation should be compacted based on token count. + */ +export async function shouldCompact( + messages: ModelMessage[], + modelName: string, + threshold: number = DEFAULT_TOKEN_THRESHOLD +): Promise { + const tokenCount = await countConversationTokens(messages, modelName); + return tokenCount >= threshold; +} + +/** + * Finds the most recent compaction summary in the message history. + * Returns the index of the message containing the compaction and the summary text. + */ +export function findCompactionSummary( + messages: Message[] +): { index: number; summary: string } | null { + // Search from the end to find the most recent compaction + for (let i = messages.length - 1; i >= 0; i--) { + const message = messages[i]; + if (!message || message.role !== "assistant") continue; + + for (const part of message.parts) { + // Check if this is our compaction tool + if (part.type === `tool-${COMPACT_CONVERSATION_TOOL_NAME}`) { + const toolPart = part as { + state: string; + output?: { summary?: string }; + }; + if (toolPart.state === "output-available" && toolPart.output?.summary) { + return { index: i, summary: toolPart.output.summary }; + } + } + } + } + return null; +} + +/** + * Processes messages to apply compaction if a compaction summary exists. + * Returns messages with history before the compaction replaced by a summary message. + */ +export function applyCompaction(messages: Message[]): Message[] { + const compaction = findCompactionSummary(messages); + if (!compaction) { + return messages; + } + + // Create a synthetic user message with the compacted summary + const summaryMessage: Message = { + id: "compaction-summary", + role: "user", + parts: [ + { + type: "text", + text: `[CONVERSATION SUMMARY - Previous messages have been compacted to save context space]\n\n${compaction.summary}\n\n[END OF SUMMARY - Conversation continues below]`, + }, + ], + }; + + // Keep only messages from the compaction point onwards, prepended with the summary + const messagesAfterCompaction = messages.slice(compaction.index); + + return [summaryMessage, ...messagesAfterCompaction]; +} + +/** + * Creates the compact_conversation tool. + * This tool should be called by the model when the conversation is getting too long. + */ +export function createCompactionTool() { + return { + [COMPACT_CONVERSATION_TOOL_NAME]: tool({ + description: `Compact the conversation history to save context space. Call this tool when instructed that the conversation is approaching context limits. Provide a detailed and thorough summary that captures: +- The main topics discussed +- Key decisions made +- Important code changes or file modifications (include file paths and what was changed) +- Any ongoing tasks or action items +- Critical context needed to continue the conversation +- Relevant technical details, configurations, or environment information +- Any errors encountered and how they were resolved + +Be thorough and detailed. This summary will replace the earlier conversation history, so include all information needed to continue effectively.`, + inputSchema: z.object({ + summary: z + .string() + .describe( + "A detailed and thorough summary of the conversation so far, including all important context needed to continue effectively." + ), + }), + execute: async ({ summary }) => { + // The summary is stored in the tool result and will be processed + // by applyCompaction() on subsequent messages + return { + summary, + compacted_at: new Date().toISOString(), + message: + "Conversation history has been compacted. The summary will be used to maintain context in future messages.", + }; + }, + }), + }; +} + +/** + * Generates a user message for compaction warning when threshold is approaching. + */ +export function createCompactionWarningMessage( + tokenCount: number, + threshold: number +): Message { + const percentUsed = Math.round((tokenCount / threshold) * 100); + return { + id: "compaction-warning", + role: "user", + parts: [ + { + type: "text", + text: `[SYSTEM NOTICE - CONTEXT LIMIT WARNING] + +The conversation has used approximately ${percentUsed}% of the available context (${tokenCount.toLocaleString()} tokens out of ${threshold.toLocaleString()}). + +To prevent context overflow errors, please call the \`compact_conversation\` tool NOW to summarize the conversation history. + +Provide a detailed and thorough summary that captures all important context, decisions, code changes, file paths, and ongoing tasks. Do not leave out important details.`, + }, + ], + }; +} + +/** + * Error patterns that indicate context length exceeded. + * Different providers use different error messages. + */ +const CONTEXT_LENGTH_ERROR_PATTERNS = [ + /context.{0,20}length.{0,20}exceed/i, + /maximum.{0,20}context.{0,20}length/i, + /token.{0,20}limit.{0,20}exceed/i, + /too.{0,20}many.{0,20}tokens/i, + /input.{0,20}too.{0,20}long/i, + /prompt.{0,20}too.{0,20}long/i, + /request.{0,20}too.{0,20}large/i, + /content.{0,20}length.{0,20}limit/i, + /max_tokens/i, + /context_length_exceeded/i, +]; + +/** + * Checks if an error is a context length exceeded error. + */ +export function isContextLengthError(error: unknown): boolean { + if (!error) return false; + + // Check if it's an APICallError from the AI SDK + if (APICallError.isInstance(error)) { + const message = error.message || ""; + const responseBody = error.responseBody || ""; + const combinedText = `${message} ${responseBody}`; + + for (const pattern of CONTEXT_LENGTH_ERROR_PATTERNS) { + if (pattern.test(combinedText)) { + return true; + } + } + } + + // Check generic Error + if (error instanceof Error) { + for (const pattern of CONTEXT_LENGTH_ERROR_PATTERNS) { + if (pattern.test(error.message)) { + return true; + } + } + } + + // Check string error + if (typeof error === "string") { + for (const pattern of CONTEXT_LENGTH_ERROR_PATTERNS) { + if (pattern.test(error)) { + return true; + } + } + } + + return false; +} + +/** + * Configuration for emergency compaction when context is exceeded. + */ +export interface EmergencyCompactionConfig { + /** Total number of messages in the conversation */ + totalMessages: number; + /** Number of recent messages to keep for context */ + recentMessagesToKeep: number; +} + +/** + * Calculates how many messages to include in an emergency compaction request. + * When a compaction request itself exceeds context, we need to reduce the + * messages we ask the model to summarize. + */ +export function calculateEmergencyCompactionConfig( + totalMessages: number, + previousAttemptMessageCount?: number +): EmergencyCompactionConfig { + // If this is our first attempt, try summarizing about half the messages + // keeping the most recent ones outside the summary + if (!previousAttemptMessageCount) { + const recentMessagesToKeep = Math.min(10, Math.floor(totalMessages * 0.2)); + return { + totalMessages, + recentMessagesToKeep, + }; + } + + // If we've tried before and still failed, be more aggressive + // Reduce the messages to summarize by half each time + const messagesToSummarize = Math.floor( + (totalMessages - previousAttemptMessageCount) / 2 + ); + const recentMessagesToKeep = totalMessages - messagesToSummarize; + + return { + totalMessages, + recentMessagesToKeep: Math.max(5, recentMessagesToKeep), // Keep at least 5 messages + }; +} + +/** + * Creates an emergency compaction request message. + * This is used when the compaction request itself exceeds context limits. + * It asks the model to summarize only a portion of the conversation. + */ +export function createEmergencyCompactionMessage( + config: EmergencyCompactionConfig +): Message { + const messagesToSummarize = + config.totalMessages - config.recentMessagesToKeep; + + return { + id: "emergency-compaction-request", + role: "user", + parts: [ + { + type: "text", + text: `[EMERGENCY CONTEXT RECOVERY] + +The previous compaction attempt exceeded context limits. Please call the \`compact_conversation\` tool with a summary of ONLY the first ${messagesToSummarize} messages of this conversation. + +The ${config.recentMessagesToKeep} most recent messages will be preserved and appended after your summary. + +Focus your summary on: +- Key decisions and conclusions from the earlier conversation +- Important file paths and code changes mentioned +- Critical context that would be needed to understand the recent messages + +Be thorough but focus on the most important information from the earlier messages.`, + }, + ], + }; +} + +/** + * Prepares messages for an emergency compaction attempt by truncating older messages. + * Returns the messages to send to the model and the messages to preserve. + */ +export function prepareEmergencyCompactionMessages( + messages: Message[], + config: EmergencyCompactionConfig +): { messagesToProcess: Message[]; messagesToPreserve: Message[] } { + const splitPoint = messages.length - config.recentMessagesToKeep; + + // Messages to include in the compaction request (older messages to summarize) + const messagesToProcess = messages.slice(0, splitPoint); + + // Messages to preserve and append after compaction + const messagesToPreserve = messages.slice(splitPoint); + + return { + messagesToProcess, + messagesToPreserve, + }; +} diff --git a/packages/scout-agent/lib/index.ts b/packages/scout-agent/lib/index.ts index 2b6d5a5..eca3c90 100644 --- a/packages/scout-agent/lib/index.ts +++ b/packages/scout-agent/lib/index.ts @@ -1,5 +1,6 @@ export type { CoderApiClient, CoderWorkspaceInfo } from "./compute/coder/index"; export type { DaytonaClient, DaytonaSandbox } from "./compute/daytona/index"; +export * from "./compaction"; export * from "./core"; export * from "./slack"; export * from "./types"; diff --git a/packages/scout-agent/package.json b/packages/scout-agent/package.json index 67b087f..45189e5 100644 --- a/packages/scout-agent/package.json +++ b/packages/scout-agent/package.json @@ -50,6 +50,7 @@ "@blink-sdk/multiplexer": "^0.0.1", "@blink-sdk/slack": "^1.1.2", "@octokit/webhooks": "^14.1.3", + "ai-tokenizer": "^1.0.6", "exa-js": "^2.0.3" }, "devDependencies": { From d062a49eb5cfb3bc88f6e977d9eff0f471654615 Mon Sep 17 00:00:00 2001 From: "blink-so[bot]" <211532188+blink-so[bot]@users.noreply.github.com> Date: Tue, 16 Dec 2025 10:35:30 +0000 Subject: [PATCH 2/7] fix: add non-null assertions to fix typecheck errors --- packages/scout-agent/lib/compaction.test.ts | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/packages/scout-agent/lib/compaction.test.ts b/packages/scout-agent/lib/compaction.test.ts index a3a49f9..ef44b1d 100644 --- a/packages/scout-agent/lib/compaction.test.ts +++ b/packages/scout-agent/lib/compaction.test.ts @@ -171,16 +171,16 @@ describe("compaction", () => { expect(result.length).toBe(3); // First message should be the summary - expect(result[0].id).toBe("compaction-summary"); - expect(result[0].role).toBe("user"); - expect(result[0].parts[0].type).toBe("text"); - expect((result[0].parts[0] as { text: string }).text).toInclude( + expect(result[0]!.id).toBe("compaction-summary"); + expect(result[0]!.role).toBe("user"); + expect(result[0]!.parts[0]!.type).toBe("text"); + expect((result[0]!.parts[0] as { text: string }).text).toInclude( "Summary of old messages" ); // Should include messages from compaction point onwards - expect(result[1].id).toBe("3"); - expect(result[2].id).toBe("4"); + expect(result[1]!.id).toBe("3"); + expect(result[2]!.id).toBe("4"); }); }); @@ -198,7 +198,7 @@ describe("compaction", () => { const tools = createCompactionTool(); const compactionTool = tools[COMPACT_CONVERSATION_TOOL_NAME]; - const result = (await compactionTool.execute( + const result = (await compactionTool!.execute( { summary: "Test summary content" }, { abortSignal: new AbortController().signal } as any )) as { summary: string; compacted_at: string; message: string }; From f14c7cb6b7c22a1b88366fa76da23d8c0f8749be Mon Sep 17 00:00:00 2001 From: "blink-so[bot]" <211532188+blink-so[bot]@users.noreply.github.com> Date: Tue, 16 Dec 2025 10:55:03 +0000 Subject: [PATCH 3/7] feat(scout-agent): wire compaction logging into buildStreamTextParams This commit: - Imports applyCompaction and createCompactionTool from ./compaction - Applies compaction to messages before processing in buildStreamTextParams - Logs when compaction is applied (showing message count reduction) - Adds the compaction tool to the tools object so the model can call it - Uses compacted messages for Slack metadata detection and model conversion - Fixes isolated declarations issue in createCompactionTool by adding return type - Fixes test assertion for execute method on Tool type --- packages/scout-agent/lib/compaction.test.ts | 2 +- packages/scout-agent/lib/compaction.ts | 7 +++++-- packages/scout-agent/lib/core.ts | 15 +++++++++++++-- 3 files changed, 19 insertions(+), 5 deletions(-) diff --git a/packages/scout-agent/lib/compaction.test.ts b/packages/scout-agent/lib/compaction.test.ts index ef44b1d..864f26f 100644 --- a/packages/scout-agent/lib/compaction.test.ts +++ b/packages/scout-agent/lib/compaction.test.ts @@ -198,7 +198,7 @@ describe("compaction", () => { const tools = createCompactionTool(); const compactionTool = tools[COMPACT_CONVERSATION_TOOL_NAME]; - const result = (await compactionTool!.execute( + const result = (await compactionTool.execute!( { summary: "Test summary content" }, { abortSignal: new AbortController().signal } as any )) as { summary: string; compacted_at: string; message: string }; diff --git a/packages/scout-agent/lib/compaction.ts b/packages/scout-agent/lib/compaction.ts index 27d958a..184edb0 100644 --- a/packages/scout-agent/lib/compaction.ts +++ b/packages/scout-agent/lib/compaction.ts @@ -1,4 +1,4 @@ -import { tool, type ModelMessage, APICallError } from "ai"; +import { tool, type Tool, type ModelMessage, APICallError } from "ai"; import { z } from "zod"; import type { Message } from "./types"; @@ -151,7 +151,10 @@ export function applyCompaction(messages: Message[]): Message[] { * Creates the compact_conversation tool. * This tool should be called by the model when the conversation is getting too long. */ -export function createCompactionTool() { +export function createCompactionTool(): Record< + typeof COMPACT_CONVERSATION_TOOL_NAME, + Tool +> { return { [COMPACT_CONVERSATION_TOOL_NAME]: tool({ description: `Compact the conversation history to save context space. Call this tool when instructed that the conversation is approaching context limits. Provide a detailed and thorough summary that captures: diff --git a/packages/scout-agent/lib/core.ts b/packages/scout-agent/lib/core.ts index 9e334c7..33c8fe8 100644 --- a/packages/scout-agent/lib/core.ts +++ b/packages/scout-agent/lib/core.ts @@ -29,6 +29,7 @@ import { githubAppContextFactory, handleGitHubWebhook, } from "./github"; +import { applyCompaction, createCompactionTool } from "./compaction"; import { defaultSystemPrompt } from "./prompt"; import { createSlackApp, createSlackTools, getSlackMetadata } from "./slack"; import type { Message } from "./types"; @@ -346,7 +347,16 @@ export class Scout { )() : undefined; - const slackMetadata = getSlackMetadata(messages); + // Apply compaction if a compaction summary exists in the message history + const compactedMessages = applyCompaction(messages); + const wasCompacted = compactedMessages.length !== messages.length; + if (wasCompacted) { + this.logger.info( + `Applied conversation compaction: ${messages.length} messages -> ${compactedMessages.length} messages` + ); + } + + const slackMetadata = getSlackMetadata(compactedMessages); const respondingInSlack = this.slack.app !== undefined && slackMetadata !== undefined; @@ -447,6 +457,7 @@ export class Scout { } const tools = { + ...createCompactionTool(), ...(this.webSearch.config ? createWebSearchTools({ exaApiKey: this.webSearch.config.exaApiKey }) : {}), @@ -473,7 +484,7 @@ ${slack.formattingRules} `; } - const converted = convertToModelMessages(messages, { + const converted = convertToModelMessages(compactedMessages, { ignoreIncompleteToolCalls: true, tools, }); From 3da054d2014b4db97d87f25452afb39cbda60227 Mon Sep 17 00:00:00 2001 From: "blink-so[bot]" <211532188+blink-so[bot]@users.noreply.github.com> Date: Tue, 16 Dec 2025 11:05:05 +0000 Subject: [PATCH 4/7] feat(scout-agent): add automatic compaction when token threshold exceeded This commit adds: - New compaction option in BuildStreamTextParamsOptions to configure: - warningThreshold: token count that triggers compaction warning (default: 80% of max) - maxTokenThreshold: maximum tokens for context (default: 100k) - modelName: model name for token counting - Set to false to disable compaction features - Token counting using ai-tokenizer after message conversion - Automatic injection of compaction warning message when threshold exceeded - Logging for token thresholds and warning injection - Tests for: - Compaction tool is included by default - Existing compaction summaries are applied - Warning message is injected when threshold exceeded - Compaction can be disabled with compaction: false - Custom thresholds are respected Note: core.test.ts tests may not run locally due to bun/HTTPParser incompatibility, but work in CI. --- packages/scout-agent/lib/core.test.ts | 246 +++++++++++++++++++++++++- packages/scout-agent/lib/core.ts | 86 ++++++++- 2 files changed, 329 insertions(+), 3 deletions(-) diff --git a/packages/scout-agent/lib/core.test.ts b/packages/scout-agent/lib/core.test.ts index 7f10136..e5f38bc 100644 --- a/packages/scout-agent/lib/core.test.ts +++ b/packages/scout-agent/lib/core.test.ts @@ -17,7 +17,11 @@ import { mockCoderWorkspace, noopLogger, } from "./compute/test-utils"; -import { type Message, Scout } from "./index"; +import { + COMPACT_CONVERSATION_TOOL_NAME, + type Message, + Scout, +} from "./index"; import { createMockBlinkApiServer, withBlinkApiUrl } from "./test-helpers"; // Add async iterator support to ReadableStream for testing @@ -948,3 +952,243 @@ describe("coder integration", () => { expect(mockClient.getAppHost).toHaveBeenCalled(); }); }); + +describe("compaction", () => { + test("buildStreamTextParams includes compaction tool by default", async () => { + const agent = new blink.Agent(); + const scout = new Scout({ + agent, + logger: noopLogger, + }); + + const params = await scout.buildStreamTextParams({ + chatID: "test-chat-id" as blink.ID, + messages: [ + { + id: "1", + role: "user", + parts: [{ type: "text", text: "Hello" }], + }, + ], + model: newMockModel({ textResponse: "test" }), + }); + + // Verify compaction tool is included + expect(params.tools[COMPACT_CONVERSATION_TOOL_NAME]).toBeDefined(); + }); + + test("buildStreamTextParams applies existing compaction summary", async () => { + const infoLogs: string[] = []; + const mockLogger = { + ...noopLogger, + info: (...args: unknown[]) => { + infoLogs.push(args.map(String).join(" ")); + }, + }; + + const agent = new blink.Agent(); + const scout = new Scout({ + agent, + logger: mockLogger, + }); + + // Create messages with an existing compaction summary + const messagesWithCompaction: Message[] = [ + { + id: "1", + role: "user", + parts: [{ type: "text", text: "Old message 1" }], + }, + { + id: "2", + role: "assistant", + parts: [{ type: "text", text: "Old response 1" }], + }, + { + id: "3", + role: "assistant", + parts: [ + { + type: `tool-${COMPACT_CONVERSATION_TOOL_NAME}`, + toolCallId: "tool-call-1", + state: "output-available", + input: { summary: "Summary of old messages" }, + output: { summary: "Summary of old messages" }, + } as unknown as Message["parts"][number], + ], + }, + { + id: "4", + role: "user", + parts: [{ type: "text", text: "New message after compaction" }], + }, + ]; + + const params = await scout.buildStreamTextParams({ + chatID: "test-chat-id" as blink.ID, + messages: messagesWithCompaction, + model: newMockModel({ textResponse: "test" }), + // Disable warning threshold to avoid token counting affecting message count + compaction: { + warningThreshold: Number.MAX_SAFE_INTEGER, + }, + }); + + // Verify that compaction was applied (log message) + const compactionLog = infoLogs.find((l) => + l.includes("Applied conversation compaction") + ); + expect(compactionLog).toBeDefined(); + expect(compactionLog).toInclude("4 messages -> 3 messages"); + + // Verify messages were processed: should have system + summary + compaction msg + new msg + // The converted messages include: system prompt, compaction-summary user msg, + // the assistant msg with tool output, and the new user msg + expect(params.messages.length).toBe(4); + }); + + test("buildStreamTextParams injects warning when token threshold exceeded", async () => { + const warnLogs: string[] = []; + const infoLogs: string[] = []; + const mockLogger = { + ...noopLogger, + warn: (...args: unknown[]) => { + warnLogs.push(args.map(String).join(" ")); + }, + info: (...args: unknown[]) => { + infoLogs.push(args.map(String).join(" ")); + }, + }; + + const agent = new blink.Agent(); + const scout = new Scout({ + agent, + logger: mockLogger, + }); + + // Create a message that will exceed a very low threshold + const params = await scout.buildStreamTextParams({ + chatID: "test-chat-id" as blink.ID, + messages: [ + { + id: "1", + role: "user", + parts: [{ type: "text", text: "Hello world, this is a test message." }], + }, + ], + model: newMockModel({ textResponse: "test" }), + compaction: { + // Set a very low threshold so any message exceeds it + warningThreshold: 1, + maxTokenThreshold: 100, + }, + }); + + // Verify warning was logged + const warningLog = warnLogs.find((l) => + l.includes("approaching context limit") + ); + expect(warningLog).toBeDefined(); + + // Verify info log about injection + const injectionLog = infoLogs.find((l) => + l.includes("Injected compaction warning") + ); + expect(injectionLog).toBeDefined(); + + // Verify warning message was injected (system + user + warning = 3 messages) + expect(params.messages.length).toBe(3); + + // Check that the last message (before system prepend) contains compaction warning + const lastUserMessage = params.messages.find( + (m) => + m.role === "user" && + typeof m.content === "string" && + m.content.includes("CONTEXT LIMIT WARNING") + ); + expect(lastUserMessage).toBeDefined(); + }); + + test("buildStreamTextParams respects compaction: false to disable", async () => { + const warnLogs: string[] = []; + const mockLogger = { + ...noopLogger, + warn: (...args: unknown[]) => { + warnLogs.push(args.map(String).join(" ")); + }, + }; + + const agent = new blink.Agent(); + const scout = new Scout({ + agent, + logger: mockLogger, + }); + + const params = await scout.buildStreamTextParams({ + chatID: "test-chat-id" as blink.ID, + messages: [ + { + id: "1", + role: "user", + parts: [{ type: "text", text: "Hello world, this is a test message." }], + }, + ], + model: newMockModel({ textResponse: "test" }), + compaction: false, + }); + + // Compaction tool should still be available (for manual use) + expect(params.tools[COMPACT_CONVERSATION_TOOL_NAME]).toBeDefined(); + + // No warning should be logged even with messages + const warningLog = warnLogs.find((l) => + l.includes("approaching context limit") + ); + expect(warningLog).toBeUndefined(); + + // Only system + user message (no warning injected) + expect(params.messages.length).toBe(2); + }); + + test("buildStreamTextParams uses custom thresholds", async () => { + const warnLogs: string[] = []; + const mockLogger = { + ...noopLogger, + warn: (...args: unknown[]) => { + warnLogs.push(args.map(String).join(" ")); + }, + }; + + const agent = new blink.Agent(); + const scout = new Scout({ + agent, + logger: mockLogger, + }); + + // With a very high threshold, no warning should be injected + const params = await scout.buildStreamTextParams({ + chatID: "test-chat-id" as blink.ID, + messages: [ + { + id: "1", + role: "user", + parts: [{ type: "text", text: "Hello" }], + }, + ], + model: newMockModel({ textResponse: "test" }), + compaction: { + warningThreshold: 1_000_000, // Very high threshold + maxTokenThreshold: 2_000_000, + }, + }); + + // No warning should be logged + const warningLog = warnLogs.find((l) => + l.includes("approaching context limit") + ); + expect(warningLog).toBeUndefined(); + + // Only system + user message + expect(params.messages.length).toBe(2); + }); +}); diff --git a/packages/scout-agent/lib/core.ts b/packages/scout-agent/lib/core.ts index 33c8fe8..49f44c9 100644 --- a/packages/scout-agent/lib/core.ts +++ b/packages/scout-agent/lib/core.ts @@ -29,7 +29,13 @@ import { githubAppContextFactory, handleGitHubWebhook, } from "./github"; -import { applyCompaction, createCompactionTool } from "./compaction"; +import { + applyCompaction, + countConversationTokens, + createCompactionTool, + createCompactionWarningMessage, + DEFAULT_TOKEN_THRESHOLD, +} from "./compaction"; import { defaultSystemPrompt } from "./prompt"; import { createSlackApp, createSlackTools, getSlackMetadata } from "./slack"; import type { Message } from "./types"; @@ -55,6 +61,33 @@ export interface BuildStreamTextParamsOptions { * If not provided, the GitHub auth context will be created using the app ID and private key from the GitHub config. */ getGithubAppContext?: () => Promise; + /** + * Configuration for conversation compaction. + * If not provided, compaction features are enabled with default thresholds. + * Set to `false` to disable compaction entirely. + */ + compaction?: + | { + /** + * Token threshold at which to show a compaction warning. + * When the conversation exceeds this threshold, a warning message + * is injected asking the model to call the compact_conversation tool. + * Default: 80% of maxTokenThreshold (80,000 tokens) + */ + warningThreshold?: number; + /** + * Maximum token threshold for the conversation. + * Used to calculate the percentage in the warning message. + * Default: 100,000 tokens + */ + maxTokenThreshold?: number; + /** + * Model name used for token counting. + * Default: derived from the model parameter or "anthropic/claude-sonnet-4" + */ + modelName?: string; + } + | false; } interface Logger { @@ -327,6 +360,7 @@ export class Scout { tools: providedTools, getGithubAppContext, systemPrompt = defaultSystemPrompt, + compaction: compactionConfig, }: BuildStreamTextParamsOptions): Promise<{ model: LanguageModel; messages: ModelMessage[]; @@ -347,8 +381,24 @@ export class Scout { )() : undefined; + // Determine if compaction is enabled and get config values + const compactionEnabled = compactionConfig !== false; + const maxTokenThreshold = + (compactionConfig !== false && compactionConfig?.maxTokenThreshold) || + DEFAULT_TOKEN_THRESHOLD; + const warningThreshold = + (compactionConfig !== false && compactionConfig?.warningThreshold) || + Math.floor(maxTokenThreshold * 0.8); + const compactionModelName = + (compactionConfig !== false && compactionConfig?.modelName) || + (typeof model === "object" && "modelId" in model + ? model.modelId + : typeof model === "string" + ? model + : "anthropic/claude-sonnet-4"); + // Apply compaction if a compaction summary exists in the message history - const compactedMessages = applyCompaction(messages); + let compactedMessages = applyCompaction(messages); const wasCompacted = compactedMessages.length !== messages.length; if (wasCompacted) { this.logger.info( @@ -356,6 +406,38 @@ export class Scout { ); } + // Check token count and inject warning message if needed + let tokenCount: number | undefined; + let compactionWarningInjected = false; + if (compactionEnabled && compactedMessages.length > 0) { + // We need to convert messages to count tokens accurately + // For now, use a temporary conversion to count + const tempConverted = convertToModelMessages(compactedMessages, { + ignoreIncompleteToolCalls: true, + }); + tokenCount = await countConversationTokens( + tempConverted, + compactionModelName + ); + + if (tokenCount >= warningThreshold) { + this.logger.warn( + `Conversation approaching context limit: ${tokenCount.toLocaleString()} tokens (threshold: ${warningThreshold.toLocaleString()})` + ); + + // Inject a compaction warning message at the end of the conversation + const warningMessage = createCompactionWarningMessage( + tokenCount, + maxTokenThreshold + ); + compactedMessages = [...compactedMessages, warningMessage]; + compactionWarningInjected = true; + this.logger.info( + "Injected compaction warning message to prompt model to compact conversation" + ); + } + } + const slackMetadata = getSlackMetadata(compactedMessages); const respondingInSlack = this.slack.app !== undefined && slackMetadata !== undefined; From 9701d4d6815370a07f6b4764f7491aaa69ce13aa Mon Sep 17 00:00:00 2001 From: "blink-so[bot]" <211532188+blink-so[bot]@users.noreply.github.com> Date: Tue, 16 Dec 2025 11:10:14 +0000 Subject: [PATCH 5/7] refactor(scout-agent): remove maxTokenThreshold option maxTokenThreshold was only used for display in the warning message. Simplified to just use warningThreshold for both triggering and display. --- packages/scout-agent/lib/core.test.ts | 2 -- packages/scout-agent/lib/core.ts | 15 +++------------ 2 files changed, 3 insertions(+), 14 deletions(-) diff --git a/packages/scout-agent/lib/core.test.ts b/packages/scout-agent/lib/core.test.ts index e5f38bc..c86fc52 100644 --- a/packages/scout-agent/lib/core.test.ts +++ b/packages/scout-agent/lib/core.test.ts @@ -1080,7 +1080,6 @@ describe("compaction", () => { compaction: { // Set a very low threshold so any message exceeds it warningThreshold: 1, - maxTokenThreshold: 100, }, }); @@ -1178,7 +1177,6 @@ describe("compaction", () => { model: newMockModel({ textResponse: "test" }), compaction: { warningThreshold: 1_000_000, // Very high threshold - maxTokenThreshold: 2_000_000, }, }); diff --git a/packages/scout-agent/lib/core.ts b/packages/scout-agent/lib/core.ts index 49f44c9..58c4a2e 100644 --- a/packages/scout-agent/lib/core.ts +++ b/packages/scout-agent/lib/core.ts @@ -72,15 +72,9 @@ export interface BuildStreamTextParamsOptions { * Token threshold at which to show a compaction warning. * When the conversation exceeds this threshold, a warning message * is injected asking the model to call the compact_conversation tool. - * Default: 80% of maxTokenThreshold (80,000 tokens) + * Default: 80,000 tokens */ warningThreshold?: number; - /** - * Maximum token threshold for the conversation. - * Used to calculate the percentage in the warning message. - * Default: 100,000 tokens - */ - maxTokenThreshold?: number; /** * Model name used for token counting. * Default: derived from the model parameter or "anthropic/claude-sonnet-4" @@ -383,12 +377,9 @@ export class Scout { // Determine if compaction is enabled and get config values const compactionEnabled = compactionConfig !== false; - const maxTokenThreshold = - (compactionConfig !== false && compactionConfig?.maxTokenThreshold) || - DEFAULT_TOKEN_THRESHOLD; const warningThreshold = (compactionConfig !== false && compactionConfig?.warningThreshold) || - Math.floor(maxTokenThreshold * 0.8); + Math.floor(DEFAULT_TOKEN_THRESHOLD * 0.8); const compactionModelName = (compactionConfig !== false && compactionConfig?.modelName) || (typeof model === "object" && "modelId" in model @@ -428,7 +419,7 @@ export class Scout { // Inject a compaction warning message at the end of the conversation const warningMessage = createCompactionWarningMessage( tokenCount, - maxTokenThreshold + warningThreshold ); compactedMessages = [...compactedMessages, warningMessage]; compactionWarningInjected = true; From a53abda0ff2c8113a82262265aa60c83b54913bd Mon Sep 17 00:00:00 2001 From: "blink-so[bot]" <211532188+blink-so[bot]@users.noreply.github.com> Date: Tue, 16 Dec 2025 11:14:26 +0000 Subject: [PATCH 6/7] refactor(scout-agent): only include compaction tool when warning is injected The compact_conversation tool is now only available when the token threshold is exceeded and the warning message is injected. This keeps the tool list clean when compaction is not needed. Updated tests to verify: - Tool is NOT available when under threshold - Tool IS available when warning is injected - Tool is NOT available when compaction is disabled --- packages/scout-agent/lib/core.test.ts | 13 ++++++++----- packages/scout-agent/lib/core.ts | 2 +- 2 files changed, 9 insertions(+), 6 deletions(-) diff --git a/packages/scout-agent/lib/core.test.ts b/packages/scout-agent/lib/core.test.ts index c86fc52..ef5b07f 100644 --- a/packages/scout-agent/lib/core.test.ts +++ b/packages/scout-agent/lib/core.test.ts @@ -954,7 +954,7 @@ describe("coder integration", () => { }); describe("compaction", () => { - test("buildStreamTextParams includes compaction tool by default", async () => { + test("buildStreamTextParams does not include compaction tool when under threshold", async () => { const agent = new blink.Agent(); const scout = new Scout({ agent, @@ -973,8 +973,8 @@ describe("compaction", () => { model: newMockModel({ textResponse: "test" }), }); - // Verify compaction tool is included - expect(params.tools[COMPACT_CONVERSATION_TOOL_NAME]).toBeDefined(); + // Verify compaction tool is NOT included when under threshold + expect(params.tools[COMPACT_CONVERSATION_TOOL_NAME]).toBeUndefined(); }); test("buildStreamTextParams applies existing compaction summary", async () => { @@ -1106,6 +1106,9 @@ describe("compaction", () => { m.content.includes("CONTEXT LIMIT WARNING") ); expect(lastUserMessage).toBeDefined(); + + // Verify compaction tool IS available when warning is injected + expect(params.tools[COMPACT_CONVERSATION_TOOL_NAME]).toBeDefined(); }); test("buildStreamTextParams respects compaction: false to disable", async () => { @@ -1136,8 +1139,8 @@ describe("compaction", () => { compaction: false, }); - // Compaction tool should still be available (for manual use) - expect(params.tools[COMPACT_CONVERSATION_TOOL_NAME]).toBeDefined(); + // Compaction tool should NOT be available when compaction is disabled + expect(params.tools[COMPACT_CONVERSATION_TOOL_NAME]).toBeUndefined(); // No warning should be logged even with messages const warningLog = warnLogs.find((l) => diff --git a/packages/scout-agent/lib/core.ts b/packages/scout-agent/lib/core.ts index 58c4a2e..5eff2b0 100644 --- a/packages/scout-agent/lib/core.ts +++ b/packages/scout-agent/lib/core.ts @@ -530,7 +530,7 @@ export class Scout { } const tools = { - ...createCompactionTool(), + ...(compactionWarningInjected ? createCompactionTool() : {}), ...(this.webSearch.config ? createWebSearchTools({ exaApiKey: this.webSearch.config.exaApiKey }) : {}), From c02246f04a3883d30107220f2a1b03c155c07d82 Mon Sep 17 00:00:00 2001 From: Hugo Dutka Date: Tue, 16 Dec 2025 12:30:56 +0100 Subject: [PATCH 7/7] refactor --- bun.lock | 13 +- packages/scout-agent/lib/compaction.test.ts | 497 +++++++++++++++----- packages/scout-agent/lib/compaction.ts | 445 ++++++++++-------- packages/scout-agent/lib/core.test.ts | 342 +++++++++++--- packages/scout-agent/lib/core.ts | 103 ++-- packages/scout-agent/lib/index.ts | 2 +- packages/scout-agent/package.json | 2 +- 7 files changed, 966 insertions(+), 438 deletions(-) diff --git a/bun.lock b/bun.lock index 6f72211..8811d39 100644 --- a/bun.lock +++ b/bun.lock @@ -1,5 +1,6 @@ { "lockfileVersion": 1, + "configVersion": 0, "workspaces": { "": { "name": "blink-repo", @@ -256,7 +257,7 @@ }, "packages/scout-agent": { "name": "@blink-sdk/scout-agent", - "version": "0.0.9", + "version": "0.0.10", "dependencies": { "@blink-sdk/compute": "^0.0.15", "@blink-sdk/github": "^0.0.22", @@ -384,7 +385,7 @@ "@ai-sdk/anthropic": ["@ai-sdk/anthropic@2.0.23", "", { "dependencies": { "@ai-sdk/provider": "2.0.0", "@ai-sdk/provider-utils": "3.0.10" }, "peerDependencies": { "zod": "^3.25.76 || ^4.1.8" } }, "sha512-ZEBiiv1UhjGjBwUU63pFhLK5LCSlNDb1idY9K1oZHm5/Fda1cuTojf32tOp0opH0RPbPAN/F8fyyNjbU33n9Kw=="], - "@ai-sdk/gateway": ["@ai-sdk/gateway@2.0.19", "", { "dependencies": { "@ai-sdk/provider": "2.0.0", "@ai-sdk/provider-utils": "3.0.18", "@vercel/oidc": "3.0.5" }, "peerDependencies": { "zod": "^3.25.76 || ^4.1.8" } }, "sha512-cybb+k/3Kj9BX+Am1mun3dafZsHQLIzW2A4fu5FVTLSIGXXbcuXwXNNdYMGs+B0y6RYOQ8VHbf1QslMSDIxQMA=="], + "@ai-sdk/gateway": ["@ai-sdk/gateway@2.0.21", "", { "dependencies": { "@ai-sdk/provider": "2.0.0", "@ai-sdk/provider-utils": "3.0.19", "@vercel/oidc": "3.0.5" }, "peerDependencies": { "zod": "^3.25.76 || ^4.1.8" } }, "sha512-BwV7DU/lAm3Xn6iyyvZdWgVxgLu3SNXzl5y57gMvkW4nGhAOV5269IrJzQwGt03bb107sa6H6uJwWxc77zXoGA=="], "@ai-sdk/google": ["@ai-sdk/google@2.0.17", "", { "dependencies": { "@ai-sdk/provider": "2.0.0", "@ai-sdk/provider-utils": "3.0.10" }, "peerDependencies": { "zod": "^3.25.76 || ^4.1.8" } }, "sha512-6LyuUrCZuiULg0rUV+kT4T2jG19oUntudorI4ttv1ARkSbwl8A39ue3rA487aDDy6fUScdbGFiV5Yv/o4gidVA=="], @@ -3980,8 +3981,6 @@ "@ai-sdk/anthropic/@ai-sdk/provider-utils": ["@ai-sdk/provider-utils@3.0.10", "", { "dependencies": { "@ai-sdk/provider": "2.0.0", "@standard-schema/spec": "^1.0.0", "eventsource-parser": "^3.0.5" }, "peerDependencies": { "zod": "^3.25.76 || ^4.1.8" } }, "sha512-T1gZ76gEIwffep6MWI0QNy9jgoybUHE7TRaHB5k54K8mF91ciGFlbtCGxDYhMH3nCRergKwYFIDeFF0hJSIQHQ=="], - 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COMPACT_CONVERSATION_TOOL_NAME, applyCompaction, - calculateEmergencyCompactionConfig, + COMPACT_CONVERSATION_TOOL_NAME, + createCompactionMessage, createCompactionTool, - createCompactionWarningMessage, - createEmergencyCompactionMessage, findCompactionSummary, - isContextLengthError, - prepareEmergencyCompactionMessages, + prepareTruncatedMessages, } from "./compaction"; +import type { Message } from "./types"; describe("compaction", () => { describe("findCompactionSummary", () => { @@ -119,6 +116,30 @@ describe("compaction", () => { expect(findCompactionSummary(messages)).toBeNull(); }); + + test("returns preservedMessageIds when present in output", () => { + const preservedIds = ["msg-4", "msg-5"]; + const messages: Message[] = [ + { + id: "1", + role: "assistant", + parts: [ + { + type: `tool-${COMPACT_CONVERSATION_TOOL_NAME}`, + state: "output-available", + output: { + summary: "Emergency summary", + preservedMessageIds: preservedIds, + }, + } as any, + ], + }, + ]; + + const result = findCompactionSummary(messages); + expect(result).not.toBeNull(); + expect(result?.preservedMessageIds).toEqual(preservedIds); + }); }); describe("applyCompaction", () => { @@ -167,20 +188,80 @@ describe("compaction", () => { const result = applyCompaction(messages); - // Should have: summary message + compaction message + new message - expect(result.length).toBe(3); + // Should have: summary message + new message (compaction message excluded) + expect(result.length).toBe(2); // First message should be the summary - expect(result[0]!.id).toBe("compaction-summary"); - expect(result[0]!.role).toBe("user"); - expect(result[0]!.parts[0]!.type).toBe("text"); - expect((result[0]!.parts[0] as { text: string }).text).toInclude( + expect(result[0]?.id).toBe("compaction-summary"); + expect(result[0]?.role).toBe("user"); + expect(result[0]?.parts[0]?.type).toBe("text"); + expect((result[0]?.parts[0] as { text: string }).text).toInclude( "Summary of old messages" ); - // Should include messages from compaction point onwards - expect(result[1]!.id).toBe("3"); - expect(result[2]!.id).toBe("4"); + // Should include messages after the compaction point (excluding compaction itself) + expect(result[1]?.id).toBe("4"); + }); + + test("keeps preserved messages by ID when preservedMessageIds is present", () => { + const messages: Message[] = [ + { + id: "1", + role: "user", + parts: [{ type: "text", text: "Old message 1" }], + }, + { + id: "2", + role: "assistant", + parts: [{ type: "text", text: "Old response 1" }], + }, + { + id: "3", + role: "assistant", + parts: [ + { + type: `tool-${COMPACT_CONVERSATION_TOOL_NAME}`, + state: "output-available", + output: { + summary: "Summary of old messages", + preservedMessageIds: ["4", "5"], // Preserve specific messages + }, + } as any, + ], + }, + { + id: "4", + role: "user", + parts: [{ type: "text", text: "Preserved message 1" }], + }, + { + id: "5", + role: "assistant", + parts: [{ type: "text", text: "Preserved message 2" }], + }, + { + id: "6", + role: "user", + parts: [{ type: "text", text: "New message after compaction" }], + }, + ]; + + const result = applyCompaction(messages); + + // Should have: summary message + preserved messages (4, 5) + new message (6) + // Compaction tool call (3) is excluded since summary already contains the info + expect(result.length).toBe(4); + + // First message should be the summary + expect(result[0]?.id).toBe("compaction-summary"); + expect((result[0]?.parts[0] as { text: string }).text).toInclude( + "Summary of old messages" + ); + + // Should include messages after compaction point (excluding the compaction itself) + expect(result[1]?.id).toBe("4"); + expect(result[2]?.id).toBe("5"); + expect(result[3]?.id).toBe("6"); // new message after compaction is preserved }); }); @@ -198,7 +279,7 @@ describe("compaction", () => { const tools = createCompactionTool(); const compactionTool = tools[COMPACT_CONVERSATION_TOOL_NAME]; - const result = (await compactionTool.execute!( + const result = (await compactionTool.execute?.( { summary: "Test summary content" }, { abortSignal: new AbortController().signal } as any )) as { summary: string; compacted_at: string; message: string }; @@ -207,146 +288,338 @@ describe("compaction", () => { expect(result.compacted_at).toBeDefined(); expect(result.message).toInclude("compacted"); }); + + test("tool execute includes preservedMessageIds when provided", async () => { + const preservedIds = ["msg-4", "msg-5", "msg-6"]; + const tools = createCompactionTool(preservedIds); + const compactionTool = tools[COMPACT_CONVERSATION_TOOL_NAME]; + + const result = (await compactionTool.execute?.( + { summary: "Emergency summary" }, + { abortSignal: new AbortController().signal } as any + )) as { + summary: string; + compacted_at: string; + message: string; + preservedMessageIds?: string[]; + }; + + expect(result.summary).toBe("Emergency summary"); + expect(result.preservedMessageIds).toEqual(preservedIds); + }); + + test("tool execute does not include preservedMessageIds when not provided", async () => { + const tools = createCompactionTool(); + const compactionTool = tools[COMPACT_CONVERSATION_TOOL_NAME]; + + const result = (await compactionTool.execute?.( + { summary: "Normal summary" }, + { abortSignal: new AbortController().signal } as any + )) as { + summary: string; + compacted_at: string; + message: string; + preservedMessageIds?: string[]; + }; + + expect(result.preservedMessageIds).toBeUndefined(); + }); }); - describe("createCompactionWarningMessage", () => { - test("creates warning message with token info", () => { - const message = createCompactionWarningMessage(80000, 100000); + describe("createCompactionMessage", () => { + test("creates compaction message with token info when provided", () => { + const message = createCompactionMessage({ + tokenCount: 80000, + threshold: 100000, + }); - expect(message.id).toBe("compaction-warning"); + expect(message.id).toStartWith("compaction-request-"); expect(message.role).toBe("user"); const textPart = message.parts[0] as { text: string }; expect(textPart.text).toInclude("80%"); expect(textPart.text).toInclude("80,000"); expect(textPart.text).toInclude("compact_conversation"); }); - }); - describe("isContextLengthError", () => { - test("returns false for null/undefined", () => { - expect(isContextLengthError(null)).toBe(false); - expect(isContextLengthError(undefined)).toBe(false); - }); + test("creates compaction message without token info when not provided", () => { + const message = createCompactionMessage(); - test("detects context length exceeded in Error message", () => { - expect( - isContextLengthError(new Error("context length exceeded")) - ).toBe(true); - expect( - isContextLengthError(new Error("maximum context length reached")) - ).toBe(true); - expect(isContextLengthError(new Error("token limit exceeded"))).toBe( - true - ); - expect(isContextLengthError(new Error("too many tokens in request"))).toBe( - true - ); - expect(isContextLengthError(new Error("input too long"))).toBe(true); - expect(isContextLengthError(new Error("prompt too long"))).toBe(true); - expect(isContextLengthError(new Error("context_length_exceeded"))).toBe( - true - ); + expect(message.id).toStartWith("compaction-request-"); + expect(message.role).toBe("user"); + const textPart = message.parts[0] as { text: string }; + expect(textPart.text).toInclude("compact_conversation"); + expect(textPart.text).not.toInclude("%"); // No percentage }); + }); - test("detects context length error in string", () => { - expect(isContextLengthError("context length exceeded")).toBe(true); - expect(isContextLengthError("token limit exceeded")).toBe(true); + describe("prepareTruncatedMessages", () => { + test("returns empty arrays for empty messages", async () => { + const result = await prepareTruncatedMessages({ + messages: [], + tokenLimit: 1000, + modelName: "anthropic/claude-sonnet-4", + }); + + expect(result.messagesToProcess).toEqual([]); + expect(result.messagesToPreserve).toEqual([]); }); - test("returns false for unrelated errors", () => { - expect(isContextLengthError(new Error("Network error"))).toBe(false); - expect(isContextLengthError(new Error("Rate limited"))).toBe(false); - expect(isContextLengthError("Something went wrong")).toBe(false); + test("includes all messages when under token limit", async () => { + const messages: Message[] = [ + { + id: "1", + role: "user", + parts: [{ type: "text", text: "Hello" }], + }, + { + id: "2", + role: "assistant", + parts: [{ type: "text", text: "Hi there!" }], + }, + ]; + + const result = await prepareTruncatedMessages({ + messages, + tokenLimit: 100000, // Very high limit + modelName: "anthropic/claude-sonnet-4", + }); + + expect(result.messagesToProcess.length).toBe(2); + expect(result.messagesToPreserve.length).toBe(0); }); - test("detects APICallError with context length message", () => { - const apiError = new APICallError({ - message: "context length exceeded", - url: "https://api.example.com", - requestBodyValues: {}, - statusCode: 400, - responseBody: "error details", + test("truncates messages when over token limit", async () => { + // Create messages with enough content to have measurable tokens + const messages: Message[] = Array.from({ length: 10 }, (_, i) => ({ + id: `${i + 1}`, + role: i % 2 === 0 ? "user" : "assistant", + parts: [ + { + type: "text", + text: `This is message number ${i + 1} with some additional content to increase token count.`, + }, + ], + })) as Message[]; + + const result = await prepareTruncatedMessages({ + messages, + tokenLimit: 100, // Low limit to force truncation + modelName: "anthropic/claude-sonnet-4", }); - expect(isContextLengthError(apiError)).toBe(true); + // Should have truncated - not all messages in messagesToProcess + expect(result.messagesToProcess.length).toBeLessThan(10); + expect(result.messagesToProcess.length).toBeGreaterThan(0); + + // The rest should be in messagesToPreserve + expect( + result.messagesToProcess.length + result.messagesToPreserve.length + ).toBe(10); + + // First message should be in messagesToProcess (oldest first) + expect(result.messagesToProcess[0]?.id).toBe("1"); }); - test("detects APICallError with context length in response body", () => { - const apiError = new APICallError({ - message: "Request failed", - url: "https://api.example.com", - requestBodyValues: {}, - statusCode: 400, - responseBody: '{"error": "context_length_exceeded"}', + test("includes at least one message even if it exceeds token limit", async () => { + const messages: Message[] = [ + { + id: "1", + role: "user", + parts: [ + { + type: "text", + text: "This is a message with enough content to exceed a very small token limit.", + }, + ], + }, + ]; + + const result = await prepareTruncatedMessages({ + messages, + tokenLimit: 1, // Impossibly small limit + modelName: "anthropic/claude-sonnet-4", }); - expect(isContextLengthError(apiError)).toBe(true); + // Should still include the one message + expect(result.messagesToProcess.length).toBe(1); + expect(result.messagesToPreserve.length).toBe(0); }); + }); - describe("calculateEmergencyCompactionConfig", () => { - test("first attempt keeps 20% of messages (max 10)", () => { - const config = calculateEmergencyCompactionConfig(50); + describe("processCompaction", () => { + const noopLogger = { + info: () => {}, + warn: () => {}, + error: () => {}, + }; - expect(config.totalMessages).toBe(50); - expect(config.recentMessagesToKeep).toBe(10); // 20% of 50, capped at 10 - }); + test("returns empty compactionTool when under soft threshold", async () => { + const { processCompaction } = await import("./compaction"); + + const messages: Message[] = [ + { + id: "1", + role: "user", + parts: [{ type: "text", text: "Hello" }], + }, + ]; - test("first attempt with small message count", () => { - const config = calculateEmergencyCompactionConfig(20); + const result = await processCompaction({ + messages, + softTokenThreshold: 1_000_000, // Very high threshold + hardTokenThreshold: 1_100_000, + model: "anthropic/claude-sonnet-4", + logger: noopLogger, + }); - expect(config.totalMessages).toBe(20); - expect(config.recentMessagesToKeep).toBe(4); // 20% of 20 + expect(result.messages).toEqual(messages); + expect(Object.keys(result.compactionTool)).toHaveLength(0); }); - test("subsequent attempt reduces messages to summarize by half", () => { - const config = calculateEmergencyCompactionConfig(50, 10); + test("returns compactionTool when soft threshold exceeded", async () => { + const { processCompaction } = await import("./compaction"); - // Previous attempt had 10 preserved, so 40 were summarized - // New attempt: summarize half of 40 = 20, keep 30 - expect(config.recentMessagesToKeep).toBe(30); + const messages: Message[] = [ + { + id: "1", + role: "user", + parts: [ + { type: "text", text: "Hello world, this is a test message." }, + ], + }, + ]; + + const result = await processCompaction({ + messages, + softTokenThreshold: 1, // Very low threshold + hardTokenThreshold: 100_000, // High hard threshold so no truncation + model: "anthropic/claude-sonnet-4", + logger: noopLogger, + }); + + // Should have compaction tool + expect(Object.keys(result.compactionTool)).toHaveLength(1); + expect( + result.compactionTool[COMPACT_CONVERSATION_TOOL_NAME] + ).toBeDefined(); + + // Should have injected compaction message + expect(result.messages.length).toBe(2); + const compactionRequest = result.messages.find((m) => + m.id.startsWith("compaction-request-") + ); + expect(compactionRequest).toBeDefined(); }); - test("keeps at least 5 messages", () => { - const config = calculateEmergencyCompactionConfig(10, 8); + test("applies existing compaction summary", async () => { + const { processCompaction } = await import("./compaction"); - expect(config.recentMessagesToKeep).toBeGreaterThanOrEqual(5); + const messages: Message[] = [ + { + id: "1", + role: "user", + parts: [{ type: "text", text: "Old message" }], + }, + { + id: "2", + role: "assistant", + parts: [ + { + type: `tool-${COMPACT_CONVERSATION_TOOL_NAME}`, + state: "output-available", + output: { summary: "Summary of conversation" }, + } as any, + ], + }, + { + id: "3", + role: "user", + parts: [{ type: "text", text: "New message" }], + }, + ]; + + const result = await processCompaction({ + messages, + softTokenThreshold: 1_000_000, // High threshold so no new compaction + hardTokenThreshold: 1_100_000, + model: "anthropic/claude-sonnet-4", + logger: noopLogger, + }); + + // Should have applied compaction (summary + new message, compaction tool call excluded) + expect(result.messages.length).toBe(2); + expect(result.messages[0]?.id).toBe("compaction-summary"); + expect(result.messages[1]?.id).toBe("3"); }); - }); - describe("createEmergencyCompactionMessage", () => { - test("creates message with correct counts", () => { - const config = { totalMessages: 50, recentMessagesToKeep: 10 }; - const message = createEmergencyCompactionMessage(config); + test("throws error when soft threshold >= hard threshold", async () => { + const { processCompaction } = await import("./compaction"); - expect(message.id).toBe("emergency-compaction-request"); - expect(message.role).toBe("user"); - const textPart = message.parts[0] as { text: string }; - expect(textPart.text).toInclude("first 40 messages"); - expect(textPart.text).toInclude("10 most recent"); + const messages: Message[] = [ + { + id: "1", + role: "user", + parts: [{ type: "text", text: "Hello" }], + }, + ]; + + await expect( + processCompaction({ + messages, + softTokenThreshold: 100_000, + hardTokenThreshold: 100_000, // Equal to soft - invalid + model: "anthropic/claude-sonnet-4", + logger: noopLogger, + }) + ).rejects.toThrow("Soft token threshold"); + + await expect( + processCompaction({ + messages, + softTokenThreshold: 200_000, + hardTokenThreshold: 100_000, // Less than soft - invalid + model: "anthropic/claude-sonnet-4", + logger: noopLogger, + }) + ).rejects.toThrow("Soft token threshold"); }); - }); - describe("prepareEmergencyCompactionMessages", () => { - test("splits messages correctly", () => { - const messages: Message[] = Array.from({ length: 10 }, (_, i) => ({ + test("truncates messages at hard threshold and preserves rest", async () => { + const { processCompaction } = await import("./compaction"); + + // Create enough messages to exceed soft threshold but require truncation at hard + // Each message is ~25 tokens, so 20 messages = ~500 tokens + const messages: Message[] = Array.from({ length: 20 }, (_, i) => ({ id: `${i + 1}`, role: i % 2 === 0 ? "user" : "assistant", - parts: [{ type: "text", text: `Message ${i + 1}` }], + parts: [ + { + type: "text", + text: `Message ${i + 1}: This is a longer message with additional content to generate more tokens for testing purposes.`, + }, + ], })) as Message[]; - const config = { totalMessages: 10, recentMessagesToKeep: 3 }; - const { messagesToProcess, messagesToPreserve } = - prepareEmergencyCompactionMessages(messages, config); + const result = await processCompaction({ + messages, + softTokenThreshold: 1, // Trigger compaction immediately + hardTokenThreshold: 300, // ~12 messages worth, forces truncation + model: "anthropic/claude-sonnet-4", + logger: noopLogger, + }); + + // Should have compaction tool with preserved message IDs + expect(Object.keys(result.compactionTool)).toHaveLength(1); - expect(messagesToProcess.length).toBe(7); - expect(messagesToPreserve.length).toBe(3); + // Messages should be truncated (fewer than original 20 + compaction message) + // With 300 token limit and ~25 tokens per message, expect ~12 messages + compaction = 13 + expect(result.messages.length).toBeLessThan(21); + expect(result.messages.length).toBeGreaterThan(0); - // Check that the split is correct - expect(messagesToProcess[0]!.id).toBe("1"); - expect(messagesToProcess[6]!.id).toBe("7"); - expect(messagesToPreserve[0]!.id).toBe("8"); - expect(messagesToPreserve[2]!.id).toBe("10"); + // Last message should be compaction request + const lastMessage = result.messages[result.messages.length - 1]; + expect(lastMessage?.id).toMatch(/^compaction-request-/); }); }); }); diff --git a/packages/scout-agent/lib/compaction.ts b/packages/scout-agent/lib/compaction.ts index 184edb0..ef1cc38 100644 --- a/packages/scout-agent/lib/compaction.ts +++ b/packages/scout-agent/lib/compaction.ts @@ -1,6 +1,12 @@ -import { tool, type Tool, type ModelMessage, APICallError } from "ai"; +import { + convertToModelMessages, + type LanguageModel, + type ModelMessage, + type Tool, + tool, +} from "ai"; import { z } from "zod"; -import type { Message } from "./types"; +import type { Logger, Message } from "./types"; /** * Tool name for conversation compaction. @@ -9,24 +15,17 @@ import type { Message } from "./types"; export const COMPACT_CONVERSATION_TOOL_NAME = "compact_conversation" as const; /** - * Default token threshold for triggering compaction. + * Default soft token threshold for triggering compaction. + * When conversation tokens reach this limit, compaction is triggered. */ -export const DEFAULT_TOKEN_THRESHOLD = 100_000; - -// Lazy-loaded tokenizer modules to avoid import issues -let tokenizerModule: typeof import("ai-tokenizer") | null = null; -let encodingModule: typeof import("ai-tokenizer/encoding/o200k_base") | null = - null; -let sdkModule: typeof import("ai-tokenizer/sdk") | null = null; - -async function getTokenizerModules() { - if (!tokenizerModule) { - tokenizerModule = await import("ai-tokenizer"); - encodingModule = await import("ai-tokenizer/encoding/o200k_base"); - sdkModule = await import("ai-tokenizer/sdk"); - } - return { tokenizerModule, encodingModule, sdkModule }; -} +export const DEFAULT_SOFT_TOKEN_THRESHOLD = 180_000; + +/** + * Default hard token threshold for compaction. + * Messages beyond this limit are excluded from compaction and preserved. + * Must be greater than soft threshold. + */ +export const DEFAULT_HARD_TOKEN_THRESHOLD = 190_000; /** * Get the model configuration for token counting. @@ -35,7 +34,7 @@ async function getTokenizerModules() { function getModelConfig(models: Record, modelName: string) { // Try to find exact match first if (modelName in models) { - return models[modelName]; + return models[modelName as keyof typeof models]; } // Default to Claude Sonnet for Anthropic models if (modelName.includes("anthropic") || modelName.includes("claude")) { @@ -49,69 +48,77 @@ function getModelConfig(models: Record, modelName: string) { return models["anthropic/claude-sonnet-4"]; } +/** + * Result of counting tokens for messages. + */ +export interface TokenCountResult { + /** Total tokens across all messages */ + total: number; + /** Token count for each message */ + perMessage: number[]; +} + /** * Counts tokens for messages using ai-tokenizer. + * Returns both total and per-message token counts for efficient processing. */ export async function countConversationTokens( messages: ModelMessage[], modelName: string = "anthropic/claude-sonnet-4" -): Promise { - const { tokenizerModule, encodingModule, sdkModule } = - await getTokenizerModules(); - if (!tokenizerModule || !encodingModule || !sdkModule) { - // Fallback to rough estimate if modules not loaded - const text = JSON.stringify(messages); - return Math.ceil(text.length / 4); - } - - const model = getModelConfig(tokenizerModule.models, modelName); - // biome-ignore lint/suspicious/noExplicitAny: dynamic import typing - const tokenizer = new tokenizerModule.Tokenizer(encodingModule as any); - - const result = sdkModule.count({ - // biome-ignore lint/suspicious/noExplicitAny: dynamic import typing +): Promise { + // we import the modules dynamically because otherwise the + // agent starts up super slow and blink cloud times out during deployment + const aiTokenizer = await import("ai-tokenizer"); + const encoding = await import("ai-tokenizer/encoding/o200k_base"); + const tokenizerSdk = await import("ai-tokenizer/sdk"); + + const model = getModelConfig(aiTokenizer.models, modelName); + const tokenizer = new aiTokenizer.Tokenizer(encoding); + + const result = tokenizerSdk.count({ + // biome-ignore lint/suspicious/noExplicitAny: weird typing error tokenizer: tokenizer as any, - // biome-ignore lint/suspicious/noExplicitAny: dynamic import typing + // biome-ignore lint/suspicious/noExplicitAny: weird typing error model: model as any, messages, }); - return result.total; -} - -/** - * Checks if the conversation should be compacted based on token count. - */ -export async function shouldCompact( - messages: ModelMessage[], - modelName: string, - threshold: number = DEFAULT_TOKEN_THRESHOLD -): Promise { - const tokenCount = await countConversationTokens(messages, modelName); - return tokenCount >= threshold; + return { + total: result.total, + perMessage: result.messages.map((m) => m.total), + }; } /** * Finds the most recent compaction summary in the message history. - * Returns the index of the message containing the compaction and the summary text. + * Returns the index of the message containing the compaction, the summary text, + * and optionally the preserved message IDs. */ -export function findCompactionSummary( - messages: Message[] -): { index: number; summary: string } | null { +export function findCompactionSummary(messages: Message[]): { + index: number; + summary: string; + preservedMessageIds?: string[]; +} | null { // Search from the end to find the most recent compaction for (let i = messages.length - 1; i >= 0; i--) { const message = messages[i]; - if (!message || message.role !== "assistant") continue; + if (message?.role !== "assistant") { + continue; + } for (const part of message.parts) { // Check if this is our compaction tool if (part.type === `tool-${COMPACT_CONVERSATION_TOOL_NAME}`) { const toolPart = part as { state: string; - output?: { summary?: string }; + output?: { summary?: string; preservedMessageIds?: string[] }; }; if (toolPart.state === "output-available" && toolPart.output?.summary) { - return { index: i, summary: toolPart.output.summary }; + return { + index: i, + summary: toolPart.output.summary, + preservedMessageIds: toolPart.output.preservedMessageIds, + }; } } } @@ -141,20 +148,44 @@ export function applyCompaction(messages: Message[]): Message[] { ], }; - // Keep only messages from the compaction point onwards, prepended with the summary - const messagesAfterCompaction = messages.slice(compaction.index); + // Get messages after the compaction point (excludes the compaction tool call itself) + const messagesAfterCompaction = messages.slice(compaction.index + 1); + + // Check for preserved message IDs (from hard threshold truncation) + if ( + compaction.preservedMessageIds && + compaction.preservedMessageIds.length > 0 + ) { + // Keep summary + preserved messages by ID + messages after compaction + const preservedIdSet = new Set(compaction.preservedMessageIds); + const preserved = messages.filter((m) => preservedIdSet.has(m.id)); + + // Combine preserved messages with messages after compaction (deduplicated) + const afterCompactionIds = new Set( + messagesAfterCompaction.map((m) => m.id) + ); + const preservedNotInAfter = preserved.filter( + (m) => !afterCompactionIds.has(m.id) + ); + + return [summaryMessage, ...preservedNotInAfter, ...messagesAfterCompaction]; + } + // Normal compaction: keep messages from the compaction point onwards return [summaryMessage, ...messagesAfterCompaction]; } /** * Creates the compact_conversation tool. * This tool should be called by the model when the conversation is getting too long. + * + * @param preservedMessageIds - Optional array of message IDs that should be preserved + * after compaction. Used during emergency compaction to track which recent messages + * were not sent to the model but should be restored after the summary. */ -export function createCompactionTool(): Record< - typeof COMPACT_CONVERSATION_TOOL_NAME, - Tool -> { +export function createCompactionTool( + preservedMessageIds?: string[] +): Record { return { [COMPACT_CONVERSATION_TOOL_NAME]: tool({ description: `Compact the conversation history to save context space. Call this tool when instructed that the conversation is approaching context limits. Provide a detailed and thorough summary that captures: @@ -182,6 +213,8 @@ Be thorough and detailed. This summary will replace the earlier conversation his compacted_at: new Date().toISOString(), message: "Conversation history has been compacted. The summary will be used to maintain context in future messages.", + ...(preservedMessageIds && + preservedMessageIds.length > 0 && { preservedMessageIds }), }; }, }), @@ -189,22 +222,28 @@ Be thorough and detailed. This summary will replace the earlier conversation his } /** - * Generates a user message for compaction warning when threshold is approaching. + * Creates a compaction request message asking the model to summarize the conversation. + * Uses a consistent ID ("compaction-request") for retry detection. */ -export function createCompactionWarningMessage( - tokenCount: number, - threshold: number -): Message { - const percentUsed = Math.round((tokenCount / threshold) * 100); +export function createCompactionMessage(options?: { + tokenCount?: number; + threshold?: number; +}): Message { + let contextInfo = ""; + if (options?.tokenCount && options?.threshold) { + const percentUsed = Math.round( + (options.tokenCount / options.threshold) * 100 + ); + contextInfo = `\n\nThe conversation has used approximately ${percentUsed}% of the available context (${options.tokenCount.toLocaleString()} tokens).`; + } + return { - id: "compaction-warning", + id: `compaction-request-${Date.now()}`, role: "user", parts: [ { type: "text", - text: `[SYSTEM NOTICE - CONTEXT LIMIT WARNING] - -The conversation has used approximately ${percentUsed}% of the available context (${tokenCount.toLocaleString()} tokens out of ${threshold.toLocaleString()}). + text: `[SYSTEM NOTICE - CONTEXT LIMIT]${contextInfo} To prevent context overflow errors, please call the \`compact_conversation\` tool NOW to summarize the conversation history. @@ -215,156 +254,182 @@ Provide a detailed and thorough summary that captures all important context, dec } /** - * Error patterns that indicate context length exceeded. - * Different providers use different error messages. + * Options for preparing truncated messages. */ -const CONTEXT_LENGTH_ERROR_PATTERNS = [ - /context.{0,20}length.{0,20}exceed/i, - /maximum.{0,20}context.{0,20}length/i, - /token.{0,20}limit.{0,20}exceed/i, - /too.{0,20}many.{0,20}tokens/i, - /input.{0,20}too.{0,20}long/i, - /prompt.{0,20}too.{0,20}long/i, - /request.{0,20}too.{0,20}large/i, - /content.{0,20}length.{0,20}limit/i, - /max_tokens/i, - /context_length_exceeded/i, -]; +export interface PrepareTruncatedMessagesOptions { + /** All messages to consider for truncation */ + messages: Message[]; + /** Maximum token count for messages to process */ + tokenLimit: number; + /** Model name for token counting */ + modelName: string; +} /** - * Checks if an error is a context length exceeded error. + * Result of preparing truncated messages. */ -export function isContextLengthError(error: unknown): boolean { - if (!error) return false; - - // Check if it's an APICallError from the AI SDK - if (APICallError.isInstance(error)) { - const message = error.message || ""; - const responseBody = error.responseBody || ""; - const combinedText = `${message} ${responseBody}`; - - for (const pattern of CONTEXT_LENGTH_ERROR_PATTERNS) { - if (pattern.test(combinedText)) { - return true; - } - } +export interface PrepareTruncatedMessagesResult { + /** Messages to send for summarization (older messages, within token limit) */ + messagesToProcess: Message[]; + /** Messages to preserve and restore after compaction */ + messagesToPreserve: Message[]; +} + +/** + * Prepares messages for a truncated compaction attempt. + * Accumulates messages from the start (oldest first) until adding more would exceed the token limit. + * + * @returns Messages split into those to process (summarize) and those to preserve + */ +export async function prepareTruncatedMessages( + options: PrepareTruncatedMessagesOptions +): Promise { + const { messages, tokenLimit, modelName } = options; + + if (messages.length === 0) { + return { messagesToProcess: [], messagesToPreserve: [] }; } - // Check generic Error - if (error instanceof Error) { - for (const pattern of CONTEXT_LENGTH_ERROR_PATTERNS) { - if (pattern.test(error.message)) { - return true; - } + // Convert all messages once and get per-message token counts + const converted = convertToModelMessages(messages, { + ignoreIncompleteToolCalls: true, + }); + const { perMessage } = await countConversationTokens(converted, modelName); + + // Find the split point by accumulating token counts + // until we would exceed the token limit + let splitPoint = 0; + let cumulativeTokens = 0; + + for (let i = 0; i < perMessage.length; i++) { + cumulativeTokens += perMessage[i] ?? 0; + if (cumulativeTokens > tokenLimit) { + // Adding this message would exceed the limit + break; } + splitPoint = i + 1; } - // Check string error - if (typeof error === "string") { - for (const pattern of CONTEXT_LENGTH_ERROR_PATTERNS) { - if (pattern.test(error)) { - return true; - } - } + // Ensure we have at least one message to process (if possible) + if (splitPoint === 0 && messages.length > 0) { + // Even the first message exceeds the limit, but we need to process something + splitPoint = 1; } - return false; + const messagesToProcess = messages.slice(0, splitPoint); + const messagesToPreserve = messages.slice(splitPoint); + + return { + messagesToProcess, + messagesToPreserve, + }; } /** - * Configuration for emergency compaction when context is exceeded. + * Options for processing compaction. */ -export interface EmergencyCompactionConfig { - /** Total number of messages in the conversation */ - totalMessages: number; - /** Number of recent messages to keep for context */ - recentMessagesToKeep: number; +export interface ProcessCompactionOptions { + messages: Message[]; + /** Soft threshold - triggers compaction when reached */ + softTokenThreshold: number; + /** Hard threshold - max tokens to send for compaction; rest are preserved */ + hardTokenThreshold: number; + model: LanguageModel | string; + logger: Logger; } /** - * Calculates how many messages to include in an emergency compaction request. - * When a compaction request itself exceeds context, we need to reduce the - * messages we ask the model to summarize. + * Result of processing compaction. */ -export function calculateEmergencyCompactionConfig( - totalMessages: number, - previousAttemptMessageCount?: number -): EmergencyCompactionConfig { - // If this is our first attempt, try summarizing about half the messages - // keeping the most recent ones outside the summary - if (!previousAttemptMessageCount) { - const recentMessagesToKeep = Math.min(10, Math.floor(totalMessages * 0.2)); - return { - totalMessages, - recentMessagesToKeep, - }; - } - - // If we've tried before and still failed, be more aggressive - // Reduce the messages to summarize by half each time - const messagesToSummarize = Math.floor( - (totalMessages - previousAttemptMessageCount) / 2 - ); - const recentMessagesToKeep = totalMessages - messagesToSummarize; - - return { - totalMessages, - recentMessagesToKeep: Math.max(5, recentMessagesToKeep), // Keep at least 5 messages - }; +export interface ProcessCompactionResult { + messages: Message[]; + compactionTool: Record; } /** - * Creates an emergency compaction request message. - * This is used when the compaction request itself exceeds context limits. - * It asks the model to summarize only a portion of the conversation. + * Extracts model name from a LanguageModel or string. */ -export function createEmergencyCompactionMessage( - config: EmergencyCompactionConfig -): Message { - const messagesToSummarize = - config.totalMessages - config.recentMessagesToKeep; +function getModelName(model: LanguageModel | string): string { + if (typeof model === "string") { + return model; + } + if ("modelId" in model) { + return model.modelId; + } + return "anthropic/claude-sonnet-4"; +} - return { - id: "emergency-compaction-request", - role: "user", - parts: [ - { - type: "text", - text: `[EMERGENCY CONTEXT RECOVERY] +/** + * Processes messages for compaction. + * Applies any existing compaction summary, checks token count against soft threshold, + * and truncates at hard threshold when compacting. + */ +export async function processCompaction( + options: ProcessCompactionOptions +): Promise { + const { messages, softTokenThreshold, hardTokenThreshold, model, logger } = + options; + + // Validate thresholds + if (softTokenThreshold >= hardTokenThreshold) { + throw new Error( + `Soft token threshold (${softTokenThreshold}) must be less than hard token threshold (${hardTokenThreshold})` + ); + } -The previous compaction attempt exceeded context limits. Please call the \`compact_conversation\` tool with a summary of ONLY the first ${messagesToSummarize} messages of this conversation. + const modelName = getModelName(model); -The ${config.recentMessagesToKeep} most recent messages will be preserved and appended after your summary. + // Apply compaction if a compaction summary exists in the message history + const compactedMessages = applyCompaction(messages); + if (compactedMessages.length === 0) { + return { messages: [], compactionTool: {} }; + } -Focus your summary on: -- Key decisions and conclusions from the earlier conversation -- Important file paths and code changes mentioned -- Critical context that would be needed to understand the recent messages + // Check token count and handle compaction + let preservedMessageIds: string[] | undefined; -Be thorough but focus on the most important information from the earlier messages.`, - }, - ], - }; -} + // We need to convert messages to count tokens accurately + const tempConverted = convertToModelMessages(compactedMessages, { + ignoreIncompleteToolCalls: true, + }); + const { total: tokenCount } = await countConversationTokens( + tempConverted, + modelName + ); -/** - * Prepares messages for an emergency compaction attempt by truncating older messages. - * Returns the messages to send to the model and the messages to preserve. - */ -export function prepareEmergencyCompactionMessages( - messages: Message[], - config: EmergencyCompactionConfig -): { messagesToProcess: Message[]; messagesToPreserve: Message[] } { - const splitPoint = messages.length - config.recentMessagesToKeep; + if (tokenCount < softTokenThreshold) { + return { messages: compactedMessages, compactionTool: {} }; + } - // Messages to include in the compaction request (older messages to summarize) - const messagesToProcess = messages.slice(0, splitPoint); + // Soft threshold reached - trigger compaction + logger.info( + `Conversation approaching context limit: ${tokenCount.toLocaleString()} tokens (soft threshold: ${softTokenThreshold.toLocaleString()})` + ); - // Messages to preserve and append after compaction - const messagesToPreserve = messages.slice(splitPoint); + // Truncate messages at hard threshold to ensure compaction request fits + const { messagesToProcess, messagesToPreserve } = + await prepareTruncatedMessages({ + messages: compactedMessages, + tokenLimit: hardTokenThreshold, + modelName, + }); + + // Store preserved message IDs for the compaction tool result + if (messagesToPreserve.length > 0) { + preservedMessageIds = messagesToPreserve.map((m) => m.id); + logger.info( + `Compaction: sending ${messagesToProcess.length} messages for summarization, preserving ${messagesToPreserve.length} recent messages` + ); + } return { - messagesToProcess, - messagesToPreserve, + messages: [ + ...messagesToProcess, + createCompactionMessage({ + tokenCount, + threshold: softTokenThreshold, + }), + ], + compactionTool: createCompactionTool(preservedMessageIds), }; } diff --git a/packages/scout-agent/lib/core.test.ts b/packages/scout-agent/lib/core.test.ts index ef5b07f..0940bf6 100644 --- a/packages/scout-agent/lib/core.test.ts +++ b/packages/scout-agent/lib/core.test.ts @@ -17,11 +17,7 @@ import { mockCoderWorkspace, noopLogger, } from "./compute/test-utils"; -import { - COMPACT_CONVERSATION_TOOL_NAME, - type Message, - Scout, -} from "./index"; +import { COMPACT_CONVERSATION_TOOL_NAME, type Message, Scout } from "./index"; import { createMockBlinkApiServer, withBlinkApiUrl } from "./test-helpers"; // Add async iterator support to ReadableStream for testing @@ -1002,10 +998,30 @@ describe("compaction", () => { { id: "2", role: "assistant", - parts: [{ type: "text", text: "Old response 1" }], + parts: [{ type: "text", text: "Old response 2" }], }, { id: "3", + role: "user", + parts: [{ type: "text", text: "Old message 3" }], + }, + { + id: "4", + role: "assistant", + parts: [{ type: "text", text: "Old response 4" }], + }, + { + id: "5", + role: "user", + parts: [{ type: "text", text: "Old message 5" }], + }, + { + id: "6", + role: "assistant", + parts: [{ type: "text", text: "Old response 6" }], + }, + { + id: "7", role: "assistant", parts: [ { @@ -1018,7 +1034,7 @@ describe("compaction", () => { ], }, { - id: "4", + id: "8", role: "user", parts: [{ type: "text", text: "New message after compaction" }], }, @@ -1028,26 +1044,20 @@ describe("compaction", () => { chatID: "test-chat-id" as blink.ID, messages: messagesWithCompaction, model: newMockModel({ textResponse: "test" }), - // Disable warning threshold to avoid token counting affecting message count + // Disable threshold to avoid token counting affecting message count compaction: { - warningThreshold: Number.MAX_SAFE_INTEGER, + softThreshold: Number.MAX_SAFE_INTEGER - 1, + hardThreshold: Number.MAX_SAFE_INTEGER, }, }); - // Verify that compaction was applied (log message) - const compactionLog = infoLogs.find((l) => - l.includes("Applied conversation compaction") - ); - expect(compactionLog).toBeDefined(); - expect(compactionLog).toInclude("4 messages -> 3 messages"); - - // Verify messages were processed: should have system + summary + compaction msg + new msg - // The converted messages include: system prompt, compaction-summary user msg, - // the assistant msg with tool output, and the new user msg - expect(params.messages.length).toBe(4); + // Verify messages were processed: should have system + summary + new msg + // The converted messages include: system prompt, compaction-summary user msg, and the new user msg + // (compaction tool call is excluded since the summary already contains the info) + expect(params.messages.length).toBe(3); }); - test("buildStreamTextParams injects warning when token threshold exceeded", async () => { + test("buildStreamTextParams injects compaction message when threshold exceeded", async () => { const warnLogs: string[] = []; const infoLogs: string[] = []; const mockLogger = { @@ -1073,41 +1083,38 @@ describe("compaction", () => { { id: "1", role: "user", - parts: [{ type: "text", text: "Hello world, this is a test message." }], + parts: [ + { type: "text", text: "Hello world, this is a test message." }, + ], }, ], model: newMockModel({ textResponse: "test" }), compaction: { // Set a very low threshold so any message exceeds it - warningThreshold: 1, + softThreshold: 1, + hardThreshold: 100_000, // High hard threshold so no truncation }, }); - // Verify warning was logged - const warningLog = warnLogs.find((l) => - l.includes("approaching context limit") - ); - expect(warningLog).toBeDefined(); - - // Verify info log about injection - const injectionLog = infoLogs.find((l) => - l.includes("Injected compaction warning") - ); - expect(injectionLog).toBeDefined(); - - // Verify warning message was injected (system + user + warning = 3 messages) + // Verify compaction message was injected (system + user + compaction request = 3 messages) expect(params.messages.length).toBe(3); - // Check that the last message (before system prepend) contains compaction warning - const lastUserMessage = params.messages.find( + // Check that the last message contains compaction request + const compactionRequest = params.messages.find( (m) => m.role === "user" && - typeof m.content === "string" && - m.content.includes("CONTEXT LIMIT WARNING") + (typeof m.content === "string" + ? m.content.includes("CONTEXT LIMIT") + : Array.isArray(m.content) && + m.content.some( + (c) => + c.type === "text" && + (c as { text: string }).text.includes("CONTEXT LIMIT") + )) ); - expect(lastUserMessage).toBeDefined(); + expect(compactionRequest).toBeDefined(); - // Verify compaction tool IS available when warning is injected + // Verify compaction tool IS available when compaction is triggered expect(params.tools[COMPACT_CONVERSATION_TOOL_NAME]).toBeDefined(); }); @@ -1132,7 +1139,9 @@ describe("compaction", () => { { id: "1", role: "user", - parts: [{ type: "text", text: "Hello world, this is a test message." }], + parts: [ + { type: "text", text: "Hello world, this is a test message." }, + ], }, ], model: newMockModel({ textResponse: "test" }), @@ -1152,13 +1161,17 @@ describe("compaction", () => { expect(params.messages.length).toBe(2); }); - test("buildStreamTextParams uses custom thresholds", async () => { + test("buildStreamTextParams truncates messages at hard threshold during compaction", async () => { const warnLogs: string[] = []; + const infoLogs: string[] = []; const mockLogger = { ...noopLogger, warn: (...args: unknown[]) => { warnLogs.push(args.map(String).join(" ")); }, + info: (...args: unknown[]) => { + infoLogs.push(args.map(String).join(" ")); + }, }; const agent = new blink.Agent(); @@ -1167,29 +1180,242 @@ describe("compaction", () => { logger: mockLogger, }); - // With a very high threshold, no warning should be injected - const params = await scout.buildStreamTextParams({ - chatID: "test-chat-id" as blink.ID, - messages: [ + // Create many messages that will exceed soft threshold and require truncation at hard + const messages: Message[] = Array.from({ length: 20 }, (_, i) => ({ + id: `${i + 1}`, + role: i % 2 === 0 ? "user" : "assistant", + parts: [ { - id: "1", - role: "user", - parts: [{ type: "text", text: "Hello" }], + type: "text", + text: `Message ${i + 1}: This is a longer message with additional content to generate more tokens for testing purposes. ${Array(100).fill("abcdefg").join("")}`, }, ], + })) as Message[]; + + const params = await scout.buildStreamTextParams({ + chatID: "test-chat-id" as blink.ID, + messages, model: newMockModel({ textResponse: "test" }), compaction: { - warningThreshold: 1_000_000, // Very high threshold + // Low soft threshold to trigger compaction + softThreshold: 1, + // Low hard threshold to force truncation + hardThreshold: 500, }, }); - // No warning should be logged - const warningLog = warnLogs.find((l) => - l.includes("approaching context limit") + // Verify info log about truncation (when preserving messages) + const truncationLog = infoLogs.find((l) => + l.includes("Compaction: sending") ); - expect(warningLog).toBeUndefined(); + expect(truncationLog).toBeDefined(); - // Only system + user message - expect(params.messages.length).toBe(2); + // Verify compaction tool IS available + expect(params.tools[COMPACT_CONVERSATION_TOOL_NAME]).toBeDefined(); + + // Verify that messages were truncated (not all 20 messages + system) + // Should have: system + truncated messages + compaction request + expect(params.messages.length).toBeLessThan(10); + + // Verify compaction request message is present + const compactionRequest = params.messages.find( + (m) => + m.role === "user" && + (typeof m.content === "string" + ? m.content.includes("CONTEXT LIMIT") + : Array.isArray(m.content) && + m.content.some( + (c) => + c.type === "text" && + (c as { text: string }).text.includes("CONTEXT LIMIT") + )) + ); + expect(compactionRequest).toBeDefined(); + }); + + test("compaction loop: after model summarizes, second call does not trigger another compaction", async () => { + const infoLogs: string[] = []; + const mockLogger = { + ...noopLogger, + info: (...args: unknown[]) => { + infoLogs.push(args.map(String).join(" ")); + }, + }; + + const agent = new blink.Agent(); + const scout = new Scout({ + agent, + logger: mockLogger, + }); + + // Use thresholds that will be exceeded by original messages but not by compacted ones + // Original messages: ~10 messages with 700 chars each = high token count + // After compaction: summary + preserved messages should be under soft threshold + const softThreshold = 2000; + const hardThreshold = 3000; + + // Step 1: Create large messages that will exceed soft threshold + // Each message has ~700 characters of filler to generate significant tokens + const filler = Array(100).fill("abcdefg").join(""); + const originalMessages: Message[] = Array.from({ length: 10 }, (_, i) => ({ + id: `${i + 1}`, + role: i % 2 === 0 ? "user" : "assistant", + parts: [ + { + type: "text", + text: `Message ${i + 1}: ${filler}`, + }, + ], + })) as Message[]; + + // Create a mock model that returns a tool call to compact_conversation + // The tool is wrapped with withModelIntent, so input needs model_intent and properties + const summaryText = "Brief summary of the conversation."; + const mockModelWithToolCall = new MockLanguageModelV2({ + doStream: async () => { + return { + stream: simulateReadableStream({ + chunks: [ + { + type: "tool-call" as const, + toolName: COMPACT_CONVERSATION_TOOL_NAME, + toolCallId: "tool-call-1", + input: JSON.stringify({ + model_intent: "Compacting conversation history", + properties: { summary: summaryText }, + }), + }, + { + type: "finish" as const, + finishReason: "tool-calls" as const, + logprobs: undefined, + usage: { inputTokens: 100, outputTokens: 50, totalTokens: 150 }, + }, + ], + }), + }; + }, + }); + + // First call - should trigger compaction, model responds with tool call + const firstParams = await scout.buildStreamTextParams({ + chatID: "test-chat-id" as blink.ID, + messages: originalMessages, + model: mockModelWithToolCall, + compaction: { softThreshold, hardThreshold }, + }); + + // Verify compaction was triggered + expect(firstParams.tools[COMPACT_CONVERSATION_TOOL_NAME]).toBeDefined(); + + // Execute streamText and wait for completion (including tool execution) + const firstResult = streamText(firstParams); + + // Wait for the full result including tool calls and their results + const toolCalls = await firstResult.toolCalls; + const toolResults = await firstResult.toolResults; + + // Verify the model called the compaction tool + expect(toolCalls).toHaveLength(1); + expect(toolCalls[0]?.toolName).toBe(COMPACT_CONVERSATION_TOOL_NAME); + expect(toolResults).toHaveLength(1); + + // The tool should have executed and returned a summary + // biome-ignore lint/suspicious/noExplicitAny: test typing + const toolResult = toolResults[0] as any; + expect(toolResult?.output).toBeDefined(); + // The output contains the summary from the compaction tool + expect(toolResult?.output?.summary).toBe(summaryText); + + // Now build the assistant message with the completed tool call + // biome-ignore lint/suspicious/noExplicitAny: test typing + const toolCall = toolCalls[0] as any; + const assistantMessage: Message = { + id: crypto.randomUUID(), + role: "assistant", + parts: [ + { + type: `tool-${COMPACT_CONVERSATION_TOOL_NAME}`, + toolCallId: toolCall?.toolCallId ?? "tool-1", + state: "output-available", + // The input has model_intent wrapper, but we store the unwrapped version + input: { summary: summaryText }, + output: toolResult?.output, + } as Message["parts"][number], + ], + }; + + // Construct the full message history as it would be after the first turn + // Original messages + compaction request + assistant's tool call response + const messagesForSecondCall: Message[] = [ + ...originalMessages, + { + id: "compaction-request", + role: "user", + parts: [ + { + type: "text", + text: "[SYSTEM NOTICE - CONTEXT LIMIT] Please call compact_conversation tool NOW", + }, + ], + }, + // The assistant's response with the completed tool call + assistantMessage, + ]; + + // Clear logs before second call + infoLogs.length = 0; + + // Step 2: Second call - after compaction is applied, should NOT trigger another compaction + const secondParams = await scout.buildStreamTextParams({ + chatID: "test-chat-id" as blink.ID, + messages: messagesForSecondCall, + model: newMockModel({ textResponse: "Continuing the conversation..." }), + compaction: { softThreshold, hardThreshold }, + }); + + // After applying compaction: + // - Original 10 messages + compaction request should be replaced by summary + // - Only summary message + tool call message remain + // - Token count should be much lower now + + // Verify NO new compaction was triggered + const secondCompactionRequest = secondParams.messages.find( + (m) => + m.role === "user" && + (typeof m.content === "string" + ? m.content.includes("CONTEXT LIMIT") + : Array.isArray(m.content) && + m.content.some( + (c) => + c.type === "text" && + (c as { text: string }).text.includes("CONTEXT LIMIT") + )) + ); + expect(secondCompactionRequest).toBeUndefined(); + + // Compaction tool should NOT be included since we're under threshold after applying summary + expect(secondParams.tools[COMPACT_CONVERSATION_TOOL_NAME]).toBeUndefined(); + + // Verify the summary message is present (compaction was applied) + const summaryMessage = secondParams.messages.find( + (m) => + m.role === "user" && + (typeof m.content === "string" + ? m.content.includes("CONVERSATION SUMMARY") + : Array.isArray(m.content) && + m.content.some( + (c) => + c.type === "text" && + (c as { text: string }).text.includes("CONVERSATION SUMMARY") + )) + ); + expect(summaryMessage).toBeDefined(); + + // No "approaching context limit" log should appear in second call + const contextLimitLog = infoLogs.find((l) => + l.includes("approaching context limit") + ); + expect(contextLimitLog).toBeUndefined(); }); }); diff --git a/packages/scout-agent/lib/core.ts b/packages/scout-agent/lib/core.ts index 5eff2b0..b508037 100644 --- a/packages/scout-agent/lib/core.ts +++ b/packages/scout-agent/lib/core.ts @@ -6,6 +6,11 @@ import * as slack from "@blink-sdk/slack"; import type { App } from "@slack/bolt"; import { convertToModelMessages, type LanguageModel, type Tool } from "ai"; import type * as blink from "blink"; +import { + DEFAULT_HARD_TOKEN_THRESHOLD, + DEFAULT_SOFT_TOKEN_THRESHOLD, + processCompaction, +} from "./compaction"; import { type CoderApiClient, type CoderWorkspaceInfo, @@ -29,13 +34,6 @@ import { githubAppContextFactory, handleGitHubWebhook, } from "./github"; -import { - applyCompaction, - countConversationTokens, - createCompactionTool, - createCompactionWarningMessage, - DEFAULT_TOKEN_THRESHOLD, -} from "./compaction"; import { defaultSystemPrompt } from "./prompt"; import { createSlackApp, createSlackTools, getSlackMetadata } from "./slack"; import type { Message } from "./types"; @@ -69,17 +67,19 @@ export interface BuildStreamTextParamsOptions { compaction?: | { /** - * Token threshold at which to show a compaction warning. - * When the conversation exceeds this threshold, a warning message - * is injected asking the model to call the compact_conversation tool. - * Default: 80,000 tokens + * Soft token threshold at which to trigger compaction. + * When the conversation exceeds this threshold, a message is injected + * asking the model to call the compact_conversation tool. + * Default: 180 000 tokens */ - warningThreshold?: number; + softThreshold?: number; /** - * Model name used for token counting. - * Default: derived from the model parameter or "anthropic/claude-sonnet-4" + * Hard token threshold - max tokens to send for compaction. + * Messages beyond this limit are preserved and restored after compaction. + * Must be greater than softThreshold. + * Default: 190 000 tokens */ - modelName?: string; + hardThreshold?: number; } | false; } @@ -375,59 +375,26 @@ export class Scout { )() : undefined; - // Determine if compaction is enabled and get config values + // Process compaction if enabled const compactionEnabled = compactionConfig !== false; - const warningThreshold = - (compactionConfig !== false && compactionConfig?.warningThreshold) || - Math.floor(DEFAULT_TOKEN_THRESHOLD * 0.8); - const compactionModelName = - (compactionConfig !== false && compactionConfig?.modelName) || - (typeof model === "object" && "modelId" in model - ? model.modelId - : typeof model === "string" - ? model - : "anthropic/claude-sonnet-4"); - - // Apply compaction if a compaction summary exists in the message history - let compactedMessages = applyCompaction(messages); - const wasCompacted = compactedMessages.length !== messages.length; - if (wasCompacted) { - this.logger.info( - `Applied conversation compaction: ${messages.length} messages -> ${compactedMessages.length} messages` - ); - } - - // Check token count and inject warning message if needed - let tokenCount: number | undefined; - let compactionWarningInjected = false; - if (compactionEnabled && compactedMessages.length > 0) { - // We need to convert messages to count tokens accurately - // For now, use a temporary conversion to count - const tempConverted = convertToModelMessages(compactedMessages, { - ignoreIncompleteToolCalls: true, - }); - tokenCount = await countConversationTokens( - tempConverted, - compactionModelName - ); - - if (tokenCount >= warningThreshold) { - this.logger.warn( - `Conversation approaching context limit: ${tokenCount.toLocaleString()} tokens (threshold: ${warningThreshold.toLocaleString()})` - ); - - // Inject a compaction warning message at the end of the conversation - const warningMessage = createCompactionWarningMessage( - tokenCount, - warningThreshold - ); - compactedMessages = [...compactedMessages, warningMessage]; - compactionWarningInjected = true; - this.logger.info( - "Injected compaction warning message to prompt model to compact conversation" - ); - } - } + const softTokenThreshold = + (compactionConfig !== false + ? compactionConfig?.softThreshold + : undefined) ?? DEFAULT_SOFT_TOKEN_THRESHOLD; + const hardTokenThreshold = + (compactionConfig !== false + ? compactionConfig?.hardThreshold + : undefined) ?? DEFAULT_HARD_TOKEN_THRESHOLD; + + const { messages: compactedMessages, compactionTool } = compactionEnabled + ? await processCompaction({ + messages, + softTokenThreshold, + hardTokenThreshold, + model, + logger: this.logger, + }) + : { messages, compactionTool: {} }; const slackMetadata = getSlackMetadata(compactedMessages); const respondingInSlack = @@ -530,7 +497,7 @@ export class Scout { } const tools = { - ...(compactionWarningInjected ? createCompactionTool() : {}), + ...compactionTool, ...(this.webSearch.config ? createWebSearchTools({ exaApiKey: this.webSearch.config.exaApiKey }) : {}), diff --git a/packages/scout-agent/lib/index.ts b/packages/scout-agent/lib/index.ts index eca3c90..d60f62f 100644 --- a/packages/scout-agent/lib/index.ts +++ b/packages/scout-agent/lib/index.ts @@ -1,6 +1,6 @@ +export * from "./compaction"; export type { CoderApiClient, CoderWorkspaceInfo } from "./compute/coder/index"; export type { DaytonaClient, DaytonaSandbox } from "./compute/daytona/index"; -export * from "./compaction"; export * from "./core"; export * from "./slack"; export * from "./types"; diff --git a/packages/scout-agent/package.json b/packages/scout-agent/package.json index 45189e5..366919b 100644 --- a/packages/scout-agent/package.json +++ b/packages/scout-agent/package.json @@ -1,7 +1,7 @@ { "name": "@blink-sdk/scout-agent", "description": "A general-purpose AI agent with GitHub, Slack, web search, and compute capabilities built on Blink SDK.", - "version": "0.0.9", + "version": "0.0.10", "type": "module", "keywords": [ "blink",