Skill Library Mission

Overview

A retiring distinguished fellow's final task: package everything the project knows into a skill library under .claude/skills/, so that cheaper sessions and newer engineers can carry the project forward at the same standard. This skill turns that one-off exercise into a repeatable mission with three gated phases: discover, author, review.

The mission produced its first library in this repository on 2026-07-02 (15 skills, mission skill-library-2026-07-02). The generalized dispatch prompt distilled from that run is preserved verbatim in references/mission-prompt.md.

When To Use

• A repository has deep tribal knowledge and no .claude/skills/ library, and future sessions (human or model) must operate without the current expert.
• An existing project library has drifted and needs a full re-discovery and re-review pass.
• Onboarding cost is high: the same questions get re-answered and the same dead ends get re-fought across sessions.

When NOT To Use

Situation	Use instead
Authoring or improving one skill	Skill(abstract:skill-authoring)
Skills shipped inside a plugin	Skill(plugin-dev:skill-development)
Auditing existing skills only	Skill(abstract:skills-eval)
Full project lifecycle (code, not knowledge)	Skill(attune:mission-orchestrator)

Mission Shape

Run as an attune mission with custom phases so the run survives interruption and records user directives:

{
  "mission_id": "skill-library-YYYY-MM-DD",
  "type": "custom",
  "phases": ["discover", "author", "review", "report"],
  "artifacts": { "library_root": ".claude/skills/" }
}

Save this to .attune/mission-state.json, advance current_phase at each gate, and record every user decision and override in decisions / directive_overrides. A later session must be able to resume from the state file alone.

Phase 1: Discover

No authoring happens in this phase. Investigate like an incoming principal engineer:

• README, manifest, contributor docs
• Build system and how tests actually run (not how docs claim)
• CI config and quality gates
• Git history: what changed, what got reverted, what stalled
• TODO/FIXME hotspots and issue-shaped artifacts
• Generated-data, deploy, and artifact conventions
• Any project memory available (discussions, ADRs, journals)

Then ask the user at most five questions, only for what the repo cannot tell you. The canonical five: the hardest live problem, unwritten discipline rules, the audience and what it lacks, the most expensive past failures, and what "beyond state of the art" means here. Fold the answers into every later phase.

Phase 2: Author

workflows/skill-library.js runs authoring and review as one pipeline, so each skill's review starts when that skill is written rather than when the slowest one is. It runs only when asked for, and it returns review findings instead of applying them, because fixing edits files that already exist. Without it, dispatch by hand:

Dispatch one authoring agent per skill, in parallel, following the taxonomy in modules/taxonomy.md (adapt it: merge thin categories, split deep ones, add domain categories). Aim for 10 to 16 skills. Every agent prompt embeds the rules in modules/authoring-rules.md; the non-negotiables are ground-truth-only claims, a "Provenance and maintenance" section per skill, and a write fence limiting agents to .claude/skills/.

Phase 3: Review

After all skills exist, run the three-reviewer-plus-fixer protocol in modules/review-protocol.md: factual, doctrine, and usability lenses in parallel, then one fixer applying blocking and important findings. Finish with the report: skill inventory with one-line descriptions, what was spot-checked, and what remains uncertain.

Constraints

• Run discovery even on a small repository. The five questions come from it, and there is no other source for them.
• Verify against ground truth even in a codebase you know. A wrong runbook is worse than none.
• Review the library even when it looks complete. Authoring agents cannot see each other's contradictions.
• Date-stamp every claim and give it a re-verification command. A claim that is probably still true is a claim nobody checked.

Exit Criteria

• .attune/mission-state.json exists with the custom phase list and reaches report with all prior phases completed.
• .claude/skills/ contains 10 to 16 skill directories, each with a SKILL.md whose frontmatter has name and a trigger-rich description.
• Every skill ends with a "Provenance and maintenance" section containing one-line re-verification commands.
• All three review lenses ran and every blocking or important finding is either applied or skipped with a recorded reason.
• The final report lists the inventory, spot-check evidence, and remaining uncertainties.

Provenance and Maintenance

• Origin: mission skill-library-2026-07-02 in claude-night-market; generalized prompt captured 2026-07-03.
• Verify the reference prompt still matches this skill's phases: rg -c "Phase" plugins/attune/skills/skill-library-mission/references/mission-prompt.md
• Verify the first library still exists where this skill claims: ls .claude/skills/ | head -5