Conciseness

The body is efficient — it explains only repo-specific failure modes ("a `git add` of the whole of it sweeps in anything a concurrent session left there") and never concepts Claude already knows — but a few sections could be tightened, e.g. the "Where this sits" prose and the twice-visited transcripts-absent rationale, leaving minor over-explanation rather than the leanest possible form.

Actionability

Fully executable throughout: copy-paste bash for every step (`bun run --cwd tools/pr-metrics card -- --resolve-issue`, the branch-slug `tr -c 'a-zA-Z0-9._-' '-'` transform, the `grep -c '^<details><summary>Session metrics'` duplicate check), exact flag semantics, and a complete `RETRO.md` template covering the common cases.

Workflow Clarity

A clearly sequenced Steps 1–7 workflow with explicit validation and recovery: environment probes before Step 1, the duplicate-block check before appending to the PR body ("read the body out and append to it — never compose a new one"), and per-failure fallbacks ("No `gh`: write the card with whatever identity you know and leave the block in a file").

Progressive Disclosure

Good structure with a single, verified, one-level reference (`references/card-signals.md`) clearly signaled ("Read it before Step 3") and external detail correctly deferred to `wiki/conventions/session-metrics.md` and `tools/pr-metrics/README.md`; however, the 330-line body's Step 4 signal table overlaps the reference file's role and some of it could be split out, leaving minor organization gaps.

Specificity

The description lists multiple concrete, verb-led actions with named artifacts — "write and commit the session-metrics card for the branch", "read what the session actually cost against the difficulty declared before it started", "turn that into concrete changes to the skills, `AGENTS.md`, the wiki, the tests or the brief" — covering the skill's whole job with no consequential gaps, matching the comprehensive-coverage anchor.

Completeness

It opens with an explicit trigger clause ("Use when running the retrospective on a piece of work that has just finished") and pairs it with three concrete capabilities, explicitly and clearly answering both what the skill does and when to use it.

Trigger Term Quality

Good natural-term coverage including the synonym pair "the retrospective"/"the retro", "session-metrics card", and the pipeline trigger "`prep-pr` opens the pull request"; a few common variations (e.g. "postmortem", "session cost") are missing, so it sits at good-but-not-comprehensive.

Distinctiveness Conflict Risk

A clear niche (the step straight after `prep-pr` on a finished pull request) plus an explicit ownership boundary — "Also the owner of the card — nothing else writes one carrying the pull request's identity" — keeps conflict risk with neighbouring skills minimal.