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event-log-tracing

event-log-tracing is a skill for Claude Code, Codex from baphuongna/pi-crew. It costs 45 tokens per session (3,092 once invoked), scanned A, original, MIT.

A format and guide for recording worker and agent activity as a persistent event log. Each event is stored as one JSON object per line, including lifecycle events such as workers starting, failing, or stopping.

In plain words
What is it for?
Use it to record or trace worker lifecycles, inspect run history, support crash recovery, and understand what happened during a multi-agent run.
Why use it?
It provides an evidence trail for investigating crashes, stuck agents, and abandoned runs.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

not rated 57repo changed 2mo ago A scan SkillSpector: warn 45 tokens original MIT

Good fit Use it to record or trace worker lifecycles, inspect run history, support crash recovery, and understand what happened during a multi-agent run.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/baphuongna/pi-crew/event-log-tracing
View source ↗ baphuongna/pi-crew
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add baphuongna/pi-crew --skill event-log-tracing
Clone the repo
git clone --depth 1 https://github.com/baphuongna/pi-crew

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for event-log-tracing

README.md
[![agentmods](https://agentmods.dev/badge/skills/baphuongna/pi-crew/event-log-tracing/github.svg)](https://agentmods.dev/skills/baphuongna/pi-crew/event-log-tracing)
Your own site
<a href="https://agentmods.dev/skills/baphuongna/pi-crew/event-log-tracing"><img src="https://agentmods.dev/badge/skills/baphuongna/pi-crew/event-log-tracing/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for event-log-tracing

Your own site · 80×15
<a href="https://agentmods.dev/skills/baphuongna/pi-crew/event-log-tracing"><img src="https://agentmods.dev/badge/skills/baphuongna/pi-crew/event-log-tracing.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 45 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,092 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector warn 7 Sept 2026
SkillSpector: 1 finding, up to medium

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

  • medium MCP Rug Pull · line 313
    npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.
    Fix: Pin the version: npx @scope/[email protected]
How audits are shown
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00045 $0.03092
Opus 5.5 $0.00018 $0.01237
Sonnet 5.5 $0.00009 $0.00618
Haiku 4.5 $0.00005 $0.00309

Measured 2mo ago against content hash c69af39dbce7, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

event-log-tracing scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/event-log-tracing/SKILL.md · 317 lines

How it starts

The opening of the file, as written. The whole thing — 317 lines — stays where its author put it; the contents beside it link to each section on GitHub.

event-log-tracing

Every pi-crew run writes a persistent event log at .crew/state/runs/<runId>/events.jsonl. Events are the primary evidence for understanding what happened — especially when workers crash, agents get stuck, or runs become orphaned.

Event Format

Every event is a JSON object on one line:

{
  "time": "2026-05-14T10:27:52.000Z",
  "type": "worker.spawned",
  "runId": "team_20260514092752_218fe358085d7115",
  "taskId": "01_explore",
  "message": "Worker spawned: pid 12345",
  "data": { "pid": 12345, "role": "explorer" },
  "metadata": {
    "seq": 42,
    "provenance": "team_runner",
    "fingerprint": "a1b2c3d4e5f6g7h8"
  }
}

Required fields: time, type, runId Optional fields: taskId, message, data, metadata Metadata auto-populated: seq (line number), provenance (who wrote it), fingerprint (for terminal events)

Event Taxonomy

Worker Lifecycle Events (from child-pi.ts via onLifecycleEvent callback)

Event When Data
worker.spawned Child process starts with a PID {pid, cwd}
worker.spawn_error Spawn failed (no PID, binary not found, permission denied) {pid?, error}
worker.response_timeout No stdout for responseTimeoutMs (default 5 min) {pid, error}
worker.final_drain Child finished but lingered — SIGTERM sent {pid}
worker.hard_kill Child still alive after hardKillMs — SIGKILL sent {pid}
worker.exit Process exited (before close) {pid, exitCode}
worker.close stdio fully closed {pid, exitCode}

Tracing worker crashes:

  • worker.spawned followed by worker.exit with non-zero code → worker crashed
  • worker.spawned followed immediately by worker.spawn_error → spawn failed
  • worker.spawned followed by worker.response_timeout → worker hung
  • worker.spawned followed by worker.final_drain → worker lingered but completed
  • worker.spawned followed by worker.hard_kill → worker had to be forcibly killed

Read the full file on GitHub · 317 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2mo ago Changed · +3 lines · +27 tokens per session c69af39dbce7
  2. 2mo ago First seen · 314 lines · 18 tokens per session scan A 46bb7bfcaf54

Subscribe to this mod's changes

event-log-tracing is a skill published in the GitHub repository baphuongna/pi-crew (57 stars, last pushed 7d ago), licensed MIT. It adds 45 tokens to every session and 3,092 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Debugging
Related

event-log-tracing compared with skills from other repositories

event-log-tracing next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
event-log-tracingbaphuongna/pi-crewSkill577d agoMITA45Claude Code, Codex
systematic-debuggingopen-metadata/OpenMetadataSkill16ktodayApache-2.0A37Claude Code
log-error-digestzebbern/claude-code-guideSkill4.7ktodayMITA71Claude Code, Codex
cwv-optimizeradobe/skillsSkill326todayApache-2.0A112Claude Code
ci-fixersipyourdrink-ltd/bernsteinSkill1.2ktodayApache-2.0A15Claude Code, Codex
diagnosing-missing-recordingsPostHog/posthogSkill41ktodaynoneA76Claude Code, Codex
triaging-web-analytics-supportPostHog/posthogSkill41ktodaynoneA151Claude Code, Codex