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feat: Add startTime/endTime to trace types and persist traces to disk #172

@christso

Description

@christso

Trace Timestamps & Persistence

Goal

Add startTime/endTime to trace types and persist full traces to disk via --trace flag.

Scope

1. Add startTime/endTime to core type interfaces

Replace timestamp with startTime/endTime on ToolCall, OutputMessage, and ProviderResponse. Add startTime/endTime/llmCallCount to TraceSummary and ExecutionMetrics. Since we have few users, replace timestamp directly (no soft deprecation).

Files:

  • packages/core/src/evaluation/providers/types.ts
  • packages/core/src/evaluation/trace.ts
  • All references to old timestamp field across providers and tests

2. Update computeTraceSummary to derive timing from spans

  • Derive startTime/endTime from message boundaries (earliest start, latest end)
  • Compute toolDurations from startTime/endTime when durationMs not provided
  • Count llmCallCount from assistant messages

Files:

  • packages/core/src/evaluation/trace.ts
  • New: packages/core/test/evaluation/trace-summary.test.ts

3. Add --trace flag and TraceWriter for trace persistence

  • Add --trace CLI flag that writes full outputMessages to .agentv/traces/ as JSONL
  • Add outputMessages to EvaluationResult (optional, stripped before results output)
  • TraceWriter writes JSONL trace records with spans derived from outputMessages

Files:

  • New: apps/cli/src/commands/eval/trace-writer.ts
  • apps/cli/src/commands/eval/index.ts
  • apps/cli/src/commands/eval/run-eval.ts
  • packages/core/src/evaluation/types.ts
  • packages/core/src/evaluation/orchestrator.ts

Out of scope

Aggregate threshold checks (max_total_duration_ms, max_llm_calls, max_tool_calls) are handled by #103 (execution_metrics evaluator), not this issue.

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