A retrospective report for a completed batch or milestone, where a milestone is a larger piece of planned work. It checks goals and contracts, compares planned tasks with delivered work, and suggests rule updates.

Use it after a batch or milestone to review reports, task lists, goals, contracts, and relevant Git history.

It turns completed work into a record of what was covered, skipped, or changed, making gaps and process improvements easier to see.

chief-retro — Skill for Claude Code by thaitype: A retrospective report for a completed batch or milestone…

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.

agentmods

npx agentmods add skills/thaitype/chief/chief-retro

Any agent

npx skills add thaitype/chief --skill chief-retro

Clone the repo

git clone --depth 1 https://github.com/thaitype/chief

Made for: Claude Code.

Or install chief-skills, the plugin that ships this one along with the rest of its 14 skills.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/thaitype/chief/chief-retro.svg)](https://agentmods.dev/skills/thaitype/chief/chief-retro)

Your own site

<a href="https://agentmods.dev/skills/thaitype/chief/chief-retro"><img src="https://agentmods.dev/badge/skills/thaitype/chief/chief-retro.svg" alt="Measured on agentmods" height="20"></a>

Per session 44 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 741 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

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.

Model	Per session	Once invoked
Fable 5.1	$0.00044	$0.00741
Opus 5	$0.00022	$0.00370
Sonnet 5	$0.00009	$0.00148
Haiku 4.5	$0.00004	$0.00074

Measured 6d ago against content hash 1d1ce2edc31f, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

chief-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 6d 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/chief/chief-retro/SKILL.md · 103 lines

How it starts

The opening of the file, as written. The whole thing — 103 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Run a retrospective on the current milestone.

Scope Detection

Auto-detect the scope:

Read _plan/_todo.md in the active milestone.
If ALL tasks are marked [x] → milestone retro.
If some tasks remain → batch retro (covers only the latest completed batch).

Input Sources

Batch retro

Latest _report/autopilot-run-batch-<N>.md
_plan/_todo.md (completed vs remaining)
_goal/ and _contract/ files
git log for commits since the previous batch report (or milestone start)

Milestone retro

ALL _report/ files (batch reports, task outputs, etc.)
_plan/_todo.md (full history)
_goal/ and _contract/ files
git log for the entire milestone

Report Sections

Write the report with these sections:

# Retro: <milestone> — <batch N | milestone>

## Coverage Check

For each goal and contract file, check whether the work done satisfies it:

| File | Status | Notes |
|------|--------|-------|
| _goal/xxx.md | ✅ Satisfied / ⚠️ Partial / ❌ Missing | what's done or missing |
| _contract/xxx.md | ✅ / ⚠️ / ❌ | ... |

## Planned vs Delivered

- What was in the TODO
- What was actually completed
- What was skipped or changed mid-execution

## Blockers Hit

- Issues encountered during execution
- How they were resolved (or not)

## Lessons Learned

- Patterns observed (good and bad)
- Recurring problems
- Surprises or unexpected outcomes
- What worked well and should be repeated

## Proposed Rule Updates

For each proposal:
- **What:** the rule to add or change
- **Where:** which file in `.chief/_rules/` (e.g. `_standard/auth.md`, `_verification/tests.md`)
- **Why:** what happened that motivates this rule
- **Suggestion:** recommended for the user

## User Action Needed

Items requiring human decision:
- Uncovered goals or contracts that need another batch
- Decisions to promote to permanent rules
- Manual steps that automation couldn't handle

Output File

Batch retro → .chief/<milestone>/_report/retro-batch-<N>.md
Milestone retro → .chief/<milestone>/_report/retro-milestone.md

Read the full file on GitHub · 103 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.

6d ago First seen · 103 lines · 44 tokens per session scan A 1d1ce2edc31f

Subscribe to this mod's changes

chief-retro is a skill published in the GitHub repository thaitype/chief (59 stars, last pushed today), licensed MIT. It adds 44 tokens to every session and 741 once invoked, about $0.0002 per session on Opus 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.

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