dvy1987 Run Trace
You append low-overhead, structured records per meaningful step — tool call, observation, reflection, error. Three surfaces: operational, cognitive, contextual. Never block execution to log.
Hard Rules
Append to .agent-loom/traces/<run-id>.jsonl — one JSON object per line per references/TRACE-SCHEMA.md.
Reuse step_id from active structured-planning plan when present.
Never persist secrets — refs only in input_ref / output_ref.
Logging is append-only — never rewrite prior lines.
Ensure .agent-loom/traces/ is gitignored in consumer projects.
Workflow
Step 1 — Allocate run_id
Format: YYYY-MM-DDTHH:MM:SSZ-<slug> at run start. Create empty jsonl file.
Step 2 — Append per step
After each meaningful event, append one record with correct surface:
| Event | Surface |
|---|---|
| Tool/command executed | operational |
| Plan/route/reflection | cognitive |
| cwd, branch, versions | contextual |
Step 3 — On error
Set error field on the operational record. Continue tracing if run continues.
Step 4 — Query when needed
python3 .agents/skills/run-trace/scripts/trace_query.py <path> timeline
python3 .agents/skills/run-trace/scripts/trace_query.py <path> errors
Step 5 — Hand off
On failed run, pass trace path to fault-localize.
Gotchas
- Pretty-printed JSON breaks JSONL — single-line objects only.
- Logging raw env vars may leak secrets — whitelist keys only.
- High-frequency polling loops — batch or sample; don't log every poll.
Output Format
## Run trace — [run_id]
Trace file: `.agent-loom/traces/[run_id].jsonl`
Records: N | Errors: N
Latest:
- [ts] [surface] [step_id] [action]
Query: trace_query.py [path] timeline
Examples
Teaser: 5-step plan run → 12 operational + 3 cognitive records → S3 error captured with exit code.
Full pairs: references/examples.md
Common Rationalizations
| Excuse | Reality |
|---|---|
| "Tracing is too heavy" | One JSON line per step is cheap. |
| "I'll remember what happened" | You won't — especially after revert. |
| "Chat history is enough" | Not structured; can't query errors programmatically. |
| "Secrets in output are fine locally" | Traces get committed, shared, uploaded — refs only. |
| "Skip cognitive surface" | Route decisions are the hardest to debug. |
Verification
- Trace file exists and is valid JSONL
- step_ids align with plan when planning active
- No secrets in trace payloads
- traces/ gitignored
Red Flags
- Trace file with invalid JSON lines
- Missing error field on failed tool steps
- Secrets written to jsonl
Prune Log
Last pruned: 2026-07-05
- Initial release from high-leverage skill spec (Skill 4 family)
Impact Report
Trace: [run_id] | Records: N | Errors: N | Path: .agent-loom/traces/...