William Valentin
674 lines
19 KiB
JavaScript
674 lines
19 KiB
JavaScript
#!/usr/bin/env node
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import { randomUUID } from 'node:crypto';
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import { hostname, homedir } from 'node:os';
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import { readFileSync, writeFileSync, mkdirSync, unlinkSync } from 'node:fs';
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import { join } from 'node:path';
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const INGEST_URL = process.env.AGENTMON_INGEST_URL || 'http://localhost:8080';
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const FRAMEWORK = process.env.AGENTMON_FRAMEWORK || 'claude-code';
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const HOST = process.env.AGENTMON_HOST || hostname();
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const BATCH_SIZE = 10;
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const FLUSH_MS = 2000;
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const FETCH_TIMEOUT_MS = 500;
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interface Dict { [key: string]: any }
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// ── Persisted state (survives between hook subprocess invocations) ──────────
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interface SessionState {
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runId?: string;
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spans: { [key: string]: string }; // key = sessionKey:toolName, value = spanId
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spanStartTimes?: { [spanId: string]: number }; // spanId -> epoch ms
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subagent?: { name: string; spanId: string };
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compactSpanId?: string;
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}
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const STATE_DIR = join(homedir(), '.agentmon-state');
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function ensureStateDir() {
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try { mkdirSync(STATE_DIR, { recursive: true }); } catch { /* ignore */ }
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}
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function loadState(sessionKey: string): SessionState {
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try {
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const raw = readFileSync(join(STATE_DIR, sessionKey + '.json'), 'utf8');
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return JSON.parse(raw) as SessionState;
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} catch {
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return { spans: {} };
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}
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}
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function saveState(sessionKey: string, state: SessionState) {
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ensureStateDir();
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try {
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writeFileSync(join(STATE_DIR, sessionKey + '.json'), JSON.stringify(state), 'utf8');
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} catch { /* ignore */ }
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}
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function clearState(sessionKey: string) {
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try { unlinkSync(join(STATE_DIR, sessionKey + '.json')); } catch { /* ignore */ }
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}
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// ─────────────────────────────────────────────────────────────────────────────
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let buffer: Dict[] = [];
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let flushTimer: ReturnType<typeof setTimeout> | null = null;
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let isFlushing = false;
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const activeRuns = new Map<string, string>();
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const activeSpans = new Map<string, string>();
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const activeSubagents = new Map<string, { name: string; spanId: string }>();
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function isRecord(value: unknown): value is Dict {
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return value !== null && typeof value === 'object' && !Array.isArray(value);
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}
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function pickString(...values: unknown[]): string | undefined {
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for (const value of values) {
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if (typeof value === 'string' && value.trim() !== '') {
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return value;
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}
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}
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return undefined;
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}
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function pickNumber(...values: unknown[]): number | undefined {
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for (const value of values) {
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if (typeof value === 'number' && Number.isFinite(value)) {
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return value;
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}
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}
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return undefined;
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}
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function truncate(value: unknown, limit: number): string | undefined {
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if (value === undefined || value === null) {
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return undefined;
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}
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const text = typeof value === 'string' ? value : safeJSONStringify(value);
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if (!text) {
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return undefined;
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}
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if (text.length <= limit) {
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return text;
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}
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return text.slice(0, limit) + '...';
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}
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function safeJSONStringify(value: unknown): string {
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try {
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return JSON.stringify(value);
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} catch {
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return String(value);
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}
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}
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function getSessionKey(input: Dict): string | undefined {
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return pickString(
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input.sessionId,
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input.session_id,
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input.conversationId,
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input.conversation_id,
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);
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}
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function getUsage(input: Dict): Dict | undefined {
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const usage = isRecord(input.usage) ? input.usage :
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isRecord(input.llm) ? input.llm :
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undefined;
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if (!usage) return undefined;
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const result: Dict = {};
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if (usage.input_tokens !== undefined) result.input_tokens = usage.input_tokens;
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if (usage.output_tokens !== undefined) result.output_tokens = usage.output_tokens;
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if (usage.cache_creation_tokens !== undefined) result.cache_creation_tokens = usage.cache_creation_tokens;
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if (usage.cache_read_tokens !== undefined) result.cache_read_tokens = usage.cache_read_tokens;
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if (usage.thinking_tokens !== undefined) result.thinking_tokens = usage.thinking_tokens;
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if (usage.total_tokens !== undefined) result.total_tokens = usage.total_tokens;
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if (usage.total_cost !== undefined) result.total_cost = usage.total_cost;
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return Object.keys(result).length > 0 ? result : undefined;
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}
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function getContextWindow(input: Dict): Dict | undefined {
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const stats = isRecord(input.context_stats) ? input.context_stats :
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isRecord(input.stats) ? input.stats : undefined;
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if (!stats) return undefined;
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const result: Dict = {};
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if (stats.input_tokens !== undefined) result.input_tokens = stats.input_tokens;
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if (stats.output_tokens !== undefined) result.output_tokens = stats.output_tokens;
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if (stats.used_tokens !== undefined) result.used_tokens = stats.used_tokens;
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if (stats.max_tokens !== undefined) result.max_tokens = stats.max_tokens;
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if (stats.tokens_remaining !== undefined) result.tokens_remaining = stats.tokens_remaining;
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return Object.keys(result).length > 0 ? result : undefined;
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}
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function buildEnvelope(
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type: string,
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sessionKey?: string,
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opts: {
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runId?: string;
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spanId?: string;
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parentSpanId?: string;
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attributes?: Dict;
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payload?: Dict;
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} = {},
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): Dict {
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const correlation: Dict = {};
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if (sessionKey) {
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correlation.session_id = sessionKey;
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}
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if (opts.runId) {
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correlation.run_id = opts.runId;
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}
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if (opts.spanId) {
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correlation.span_id = opts.spanId;
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}
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if (opts.parentSpanId) {
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correlation.parent_span_id = opts.parentSpanId;
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}
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const envelope: Dict = {
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schema: { name: 'agentmon.event', version: 1 },
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event: {
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id: randomUUID(),
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type,
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ts: new Date().toISOString(),
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source: {
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framework: FRAMEWORK,
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client_id: HOST,
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host: HOST,
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},
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},
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};
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if (Object.keys(correlation).length > 0) {
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envelope.correlation = correlation;
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}
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if (opts.attributes && Object.keys(opts.attributes).length > 0) {
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envelope.attributes = opts.attributes;
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}
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if (opts.payload && Object.keys(opts.payload).length > 0) {
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envelope.payload = opts.payload;
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}
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return envelope;
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}
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function scheduleFlush() {
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if (!flushTimer) {
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flushTimer = setTimeout(() => {
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void flush();
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}, FLUSH_MS);
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}
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}
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function enqueue(event: Dict) {
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buffer.push(event);
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if (buffer.length >= BATCH_SIZE) {
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void flush();
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} else {
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scheduleFlush();
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}
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}
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async function postBatch(batch: Dict[]) {
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const controller = new AbortController();
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const timeout = setTimeout(() => controller.abort(), FETCH_TIMEOUT_MS);
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try {
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await fetch(`${INGEST_URL}/v1/events`, {
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method: 'POST',
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headers: { 'Content-Type': 'application/json' },
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body: JSON.stringify(batch),
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signal: controller.signal,
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});
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} finally {
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clearTimeout(timeout);
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}
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}
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async function flush() {
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if (flushTimer) {
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clearTimeout(flushTimer);
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flushTimer = null;
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}
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if (isFlushing || buffer.length === 0) {
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return;
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}
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isFlushing = true;
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const batch = buffer.splice(0, BATCH_SIZE);
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try {
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await postBatch(batch);
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} catch {
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console.debug(`[agentmon] failed to flush ${batch.length} events`);
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} finally {
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isFlushing = false;
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if (buffer.length > 0) {
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if (buffer.length >= BATCH_SIZE) {
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void flush();
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} else {
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scheduleFlush();
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}
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}
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}
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}
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function emitError(sessionKey: string | undefined, runId: string | undefined, spanId: string | undefined, errorValue: unknown) {
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if (errorValue === undefined || errorValue === null || errorValue === false) {
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return;
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}
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const errorRecord = isRecord(errorValue) ? errorValue : {};
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const message = pickString(errorRecord.message, errorRecord.error, errorValue) || 'unknown';
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const errType = pickString(errorRecord.type, errorRecord.code) || FRAMEWORK;
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enqueue(buildEnvelope('error', sessionKey, {
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runId,
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spanId,
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payload: {
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error: {
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type: errType,
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message,
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},
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},
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}));
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}
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async function handleSessionStart(input: Dict) {
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const sessionKey = getSessionKey(input) || randomUUID();
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const runId = randomUUID();
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activeRuns.set(sessionKey, runId);
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saveState(sessionKey, { runId, spans: {} });
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const contextWindow = getContextWindow(input);
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enqueue(buildEnvelope('session.start', sessionKey, {
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attributes: contextWindow ? { context_window: contextWindow } : undefined,
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}));
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enqueue(buildEnvelope('run.start', sessionKey, {
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runId,
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attributes: {
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trigger: pickString(input.trigger_type, input.trigger),
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},
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payload: {
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prompt_preview: truncate(input.prompt, 200),
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},
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}));
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await flush();
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}
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async function handleSessionEnd(input: Dict) {
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const sessionKey = getSessionKey(input);
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const state = sessionKey ? loadState(sessionKey) : { spans: {} };
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const runId = sessionKey ? (activeRuns.get(sessionKey) || state.runId) : undefined;
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const usage = getUsage(input);
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const contextWindow = getContextWindow(input);
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const duration = pickNumber(input.duration_ms, input.elapsed_ms);
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if (runId) {
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enqueue(buildEnvelope('run.end', sessionKey, {
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runId,
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payload: {
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status: 'success',
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duration_ms: duration,
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model: pickString(input.model),
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...(usage && { usage }),
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...(contextWindow && { context_window: contextWindow }),
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},
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}));
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}
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enqueue(buildEnvelope('session.end', sessionKey, {
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payload: {
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...(usage && { usage }),
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...(contextWindow && { context_window: contextWindow }),
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},
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}));
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activeRuns.delete(sessionKey || '');
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activeSpans.clear();
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activeSubagents.clear();
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if (sessionKey) clearState(sessionKey);
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await flush();
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}
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async function handlePromptSubmit(input: Dict) {
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const sessionKey = getSessionKey(input);
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const state = sessionKey ? loadState(sessionKey) : { spans: {} };
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const runId = sessionKey ? (activeRuns.get(sessionKey) || state.runId) : undefined;
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const prompt = pickString(input.prompt, input.text, input.message);
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if (runId && prompt) {
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enqueue(buildEnvelope('run.end', sessionKey, {
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runId,
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payload: {
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status: 'success',
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duration_ms: pickNumber(input.elapsed_ms, input.duration_ms),
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},
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}));
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}
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const newRunId = randomUUID();
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if (sessionKey) {
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activeRuns.set(sessionKey, newRunId);
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saveState(sessionKey, { runId: newRunId, spans: {} });
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}
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enqueue(buildEnvelope('run.start', sessionKey, {
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runId: newRunId,
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attributes: {
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type: 'user_prompt',
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},
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payload: {
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prompt_preview: truncate(prompt, 200),
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},
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}));
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await flush();
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}
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async function handleToolStart(input: Dict) {
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const sessionKey = getSessionKey(input);
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const state = sessionKey ? loadState(sessionKey) : { spans: {} };
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const runId = sessionKey ? (activeRuns.get(sessionKey) || state.runId) : undefined;
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const toolName = pickString(input.tool, input.tool_name, input.name) || 'unknown';
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const toolInput = isRecord(input.input) ? input.input : {};
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const spanId = randomUUID();
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const spanKey = sessionKey ? sessionKey + ':' + toolName : undefined;
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if (spanKey) {
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activeSpans.set(spanKey, spanId);
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state.spans[spanKey] = spanId;
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state.spanStartTimes = state.spanStartTimes || {};
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state.spanStartTimes[spanId] = Date.now();
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if (runId) state.runId = runId;
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if (sessionKey) saveState(sessionKey, state);
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}
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enqueue(buildEnvelope('span.start', sessionKey, {
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runId,
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spanId,
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attributes: {
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span_kind: 'tool',
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name: toolName,
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},
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payload: {
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input: truncate(toolInput, 200),
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},
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}));
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await flush();
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}
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async function handleToolEnd(input: Dict) {
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const sessionKey = getSessionKey(input);
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const state = sessionKey ? loadState(sessionKey) : { spans: {} };
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const runId = sessionKey ? (activeRuns.get(sessionKey) || state.runId) : undefined;
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const toolName = pickString(input.tool, input.tool_name, input.name) || 'unknown';
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const spanKey = sessionKey ? sessionKey + ':' + toolName : undefined;
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const spanId = spanKey ? (activeSpans.get(spanKey) || state.spans[spanKey]) : undefined;
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const result = isRecord(input.result) ? input.result : isRecord(input.output) ? input.output : {};
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const success = !result.error;
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const startTime = spanId ? state.spanStartTimes?.[spanId] : undefined;
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const duration = pickNumber(input.duration_ms, input.elapsed_ms) ?? (startTime ? Date.now() - startTime : undefined);
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if (spanId && state.spanStartTimes) {
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delete state.spanStartTimes[spanId];
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if (sessionKey) saveState(sessionKey, state);
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}
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enqueue(buildEnvelope('span.end', sessionKey, {
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runId,
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spanId,
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attributes: {
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span_kind: 'tool',
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name: toolName,
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},
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payload: {
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status: success ? 'success' : 'error',
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result_preview: truncate(result.output ?? result.error ?? result, 500),
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duration_ms: duration,
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},
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}));
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if (!success) {
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emitError(sessionKey, runId, spanId, result.error);
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}
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activeSpans.delete(spanKey || '');
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await flush();
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}
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async function handleSubagentStart(input: Dict) {
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const sessionKey = getSessionKey(input);
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const state = sessionKey ? loadState(sessionKey) : { spans: {} };
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const runId = sessionKey ? (activeRuns.get(sessionKey) || state.runId) : undefined;
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const agentName = pickString(input.agent, input.agent_name, input.name) || 'unknown';
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const spanId = randomUUID();
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if (sessionKey) {
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activeSubagents.set(sessionKey, { name: agentName, spanId });
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state.subagent = { name: agentName, spanId };
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state.spanStartTimes = state.spanStartTimes || {};
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state.spanStartTimes[spanId] = Date.now();
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if (runId) state.runId = runId;
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saveState(sessionKey, state);
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}
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enqueue(buildEnvelope('span.start', sessionKey, {
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runId,
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spanId,
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attributes: {
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span_kind: 'agent',
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name: agentName,
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type: 'subagent',
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},
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payload: {
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prompt_preview: truncate(input.prompt, 200),
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},
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}));
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await flush();
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}
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async function handleSubagentStop(input: Dict) {
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const sessionKey = getSessionKey(input);
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const state = sessionKey ? loadState(sessionKey) : { spans: {} };
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const runId = sessionKey ? (activeRuns.get(sessionKey) || state.runId) : undefined;
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const subagent = sessionKey ? (activeSubagents.get(sessionKey) || state.subagent) : undefined;
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const spanId = subagent?.spanId;
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const agentName = subagent?.name || pickString(input.agent, input.agent_name) || 'unknown';
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const startTime = spanId ? state.spanStartTimes?.[spanId] : undefined;
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const duration = pickNumber(input.duration_ms, input.elapsed_ms) ?? (startTime ? Date.now() - startTime : undefined);
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const usage = getUsage(input);
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if (spanId && state.spanStartTimes) {
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delete state.spanStartTimes[spanId];
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if (sessionKey) saveState(sessionKey, state);
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}
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enqueue(buildEnvelope('span.end', sessionKey, {
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runId,
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spanId,
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attributes: {
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span_kind: 'agent',
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name: agentName,
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type: 'subagent',
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},
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payload: {
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status: 'success',
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duration_ms: duration,
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...(usage && { usage }),
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},
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}));
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activeSubagents.delete(sessionKey || '');
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await flush();
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}
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async function handleCompactStart(input: Dict) {
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const sessionKey = getSessionKey(input);
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const state = sessionKey ? loadState(sessionKey) : { spans: {} };
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const runId = sessionKey ? (activeRuns.get(sessionKey) || state.runId) : undefined;
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const spanId = randomUUID();
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if (sessionKey) {
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activeSpans.set(sessionKey + ':compact', spanId);
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state.compactSpanId = spanId;
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state.spanStartTimes = state.spanStartTimes || {};
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state.spanStartTimes[spanId] = Date.now();
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if (runId) state.runId = runId;
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saveState(sessionKey, state);
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}
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enqueue(buildEnvelope('span.start', sessionKey, {
|
|
runId,
|
|
spanId,
|
|
attributes: {
|
|
span_kind: 'internal',
|
|
name: 'context_compaction',
|
|
},
|
|
}));
|
|
|
|
await flush();
|
|
}
|
|
|
|
async function handleCompactEnd(input: Dict) {
|
|
const sessionKey = getSessionKey(input);
|
|
const state = sessionKey ? loadState(sessionKey) : { spans: {} };
|
|
const runId = sessionKey ? (activeRuns.get(sessionKey) || state.runId) : undefined;
|
|
const spanKey = sessionKey ? sessionKey + ':compact' : undefined;
|
|
const spanId = spanKey ? (activeSpans.get(spanKey) || state.compactSpanId) : undefined;
|
|
const startTime = spanId ? state.spanStartTimes?.[spanId] : undefined;
|
|
const duration = pickNumber(input.duration_ms, input.elapsed_ms) ?? (startTime ? Date.now() - startTime : undefined);
|
|
const contextWindow = getContextWindow(input);
|
|
if (spanId && state.spanStartTimes) {
|
|
delete state.spanStartTimes[spanId];
|
|
if (sessionKey) saveState(sessionKey, state);
|
|
}
|
|
|
|
enqueue(buildEnvelope('span.end', sessionKey, {
|
|
runId,
|
|
spanId,
|
|
attributes: {
|
|
span_kind: 'internal',
|
|
name: 'context_compaction',
|
|
},
|
|
payload: {
|
|
status: 'success',
|
|
duration_ms: duration,
|
|
...(contextWindow && { context_window: contextWindow }),
|
|
},
|
|
}));
|
|
|
|
activeSpans.delete(spanKey || '');
|
|
|
|
await flush();
|
|
}
|
|
|
|
async function handleNotification(input: Dict) {
|
|
const sessionKey = getSessionKey(input);
|
|
const notificationType = pickString(input.notification_type, input.type);
|
|
const usage = getUsage(input);
|
|
const contextWindow = getContextWindow(input);
|
|
const duration = pickNumber(input.duration_ms, input.elapsed_ms);
|
|
|
|
if (notificationType === 'Done' || notificationType === 'success') {
|
|
const state = sessionKey ? loadState(sessionKey) : { spans: {} };
|
|
const runId = sessionKey ? (activeRuns.get(sessionKey) || state.runId) : undefined;
|
|
|
|
if (runId) {
|
|
enqueue(buildEnvelope('run.end', sessionKey, {
|
|
runId,
|
|
payload: {
|
|
status: 'success',
|
|
duration_ms: duration,
|
|
model: pickString(input.model),
|
|
...(usage && { usage }),
|
|
...(contextWindow && { context_window: contextWindow }),
|
|
},
|
|
}));
|
|
}
|
|
|
|
// Do NOT emit session.end or clear state here — "Done" means Claude
|
|
// finished a turn, not the session. State must persist so tool calls
|
|
// between turns still have a runId. The actual session.end is emitted
|
|
// by handleSessionEnd when the Stop hook fires.
|
|
}
|
|
|
|
await flush();
|
|
}
|
|
|
|
const handler = async () => {
|
|
const args = process.argv.slice(2);
|
|
const hookType = args[0] || 'unknown';
|
|
|
|
let input: Dict = {};
|
|
try {
|
|
const stdin = await readStdin();
|
|
if (stdin) {
|
|
input = JSON.parse(stdin);
|
|
}
|
|
} catch {
|
|
input = {};
|
|
}
|
|
|
|
try {
|
|
switch (hookType) {
|
|
case 'start':
|
|
await handleSessionStart(input);
|
|
break;
|
|
case 'stop':
|
|
await handleSessionEnd(input);
|
|
break;
|
|
case 'prompt':
|
|
await handlePromptSubmit(input);
|
|
break;
|
|
case 'tool-start':
|
|
await handleToolStart(input);
|
|
break;
|
|
case 'tool-end':
|
|
await handleToolEnd(input);
|
|
break;
|
|
case 'subagent-start':
|
|
await handleSubagentStart(input);
|
|
break;
|
|
case 'subagent-stop':
|
|
await handleSubagentStop(input);
|
|
break;
|
|
case 'compact-start':
|
|
await handleCompactStart(input);
|
|
break;
|
|
case 'compact-end':
|
|
await handleCompactEnd(input);
|
|
break;
|
|
case 'notification':
|
|
await handleNotification(input);
|
|
break;
|
|
default:
|
|
console.debug(`[agentmon] unknown hook type: ${hookType}`);
|
|
}
|
|
} catch (err) {
|
|
console.debug('[agentmon] handler error:', err);
|
|
}
|
|
};
|
|
|
|
async function readStdin(): Promise<string> {
|
|
return new Promise((resolve) => {
|
|
let data = '';
|
|
process.stdin.on('data', (chunk) => data += chunk);
|
|
process.stdin.on('end', () => resolve(data));
|
|
process.stdin.on('error', () => resolve(''));
|
|
setTimeout(() => resolve(data), 100);
|
|
});
|
|
}
|
|
|
|
handler();
|