Borrowing it
Nothing to install: this file belongs to apmantza/pi-lens. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/apmantza/pi-lens/master/.claude/skills/retro/SKILL.mdgit clone --depth 1 https://github.com/apmantza/pi-lensWrote 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.
[](https://agentmods.dev/skills/apmantza/pi-lens/retro)<a href="https://agentmods.dev/skills/apmantza/pi-lens/retro"><img src="https://agentmods.dev/badge/skills/apmantza/pi-lens/retro/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.
<a href="https://agentmods.dev/skills/apmantza/pi-lens/retro"><img src="https://agentmods.dev/badge/skills/apmantza/pi-lens/retro.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00089 | $0.00498 |
| Opus 5.5 | $0.00036 | $0.00199 |
| Sonnet 5.5 | $0.00018 | $0.00100 |
| Haiku 4.5 | $0.00009 | $0.00050 |
Grade A, and why
retro 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 1mo 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.
What it actually says
Retro
Source of truth:
docs/pi-lens-retro.md. This file is the invocation procedure; on any conflict the contract wins.
Invoke
/retro with no argument runs over the current session's ledger and
transcripts. /retro <PR|issue|run id|"incident: ..."> scopes it to one
incident. The retro is read-only on the repo except for the outputs the
contract names.
Steps
- Read
docs/pi-lens-retro.mdin full, then the inputs it names for the scope: ledger, transcripts, PR bodies and verdicts, CI logs on the exact head. - Collect candidates by category; skip categories with no evidence.
- Classify each candidate mechanical or judgement. Mechanical is the default.
- Mechanical: build the check now when it is contained (governance test, hook, CI job, preflight row) and paste its red on the incident's shape and its mutation transcript; otherwise file it with the recurrence named. Judgement: one line in the catalog or the owning role contract.
- Steering audit: every no-op line names the decision it changed or is deleted.
- Record one mistake row per distinct mistake in
docs/pi-lens-merge-policy.md("Common mistakes"). - Report the fixed-shape table (Finding, Evidence, Class, Deliverable,
Status) ordered by severity, and the list of changes made or filed. When
delegated without Git authority, hand off through
RETRO.mdat the worktree root.
Do not
- Ship a check without its red transcript.
- Write a rule for a mechanical mistake.
- Create a new home for rules; the catalog, the role contracts, and the merge-policy mistake table are the only three.
- Mix the retro with implementation or review in one delegation.
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.
- 1mo ago Changed 40a800a14e36
- 1mo ago First seen · 45 lines · 89 tokens per session scan A e350cfae9142
retro is a skill published in the GitHub repository apmantza/pi-lens (514 stars, last pushed yesterday), licensed MIT. It adds 89 tokens to every session and 498 once invoked, about $0.0004 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 2026-09-16.
retro compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| retroapmantza/pi-lens | Skill | 514 | yesterday | MIT | A | 89 | Claude Code |
| systematic-debuggingopen-metadata/OpenMetadata | Skill | 16k | yesterday | Apache-2.0 | A | 37 | Claude Code |
| log-error-digestzebbern/claude-code-guide | Skill | 4.7k | 3d ago | MIT | A | 71 | Claude Code, Codex |
| cwv-optimizeradobe/skills | Skill | 319 | yesterday | Apache-2.0 | A | 112 | Claude Code |
| ci-fixersipyourdrink-ltd/bernstein | Skill | 1.2k | yesterday | Apache-2.0 | A | 15 | Claude Code, Codex |
| incident-response-incident-responsermyndharis/antigravity-skills | Skill | 1.9k | 23d ago | MIT | A | 36 | Claude Code |
| triaging-web-analytics-supportPostHog/posthog | Skill | 41k | yesterday | none | A | 151 | Claude Code, Codex |