Conciseness

There is no padding or explanation of concepts Claude already knows, but the ~17KB body inlines reference-grade material — the 157-finding catalog by class, the planted-bug "What a pass proves" history with commit hashes, and sync-commit provenance — that could be tightened or moved. Not 4: the trimming opportunity is more than minor; large sections read as a verification report rather than operating instructions.

Actionability

Fully executable, copy-paste-ready commands ("pnpm check:markdown-round-trip", "--inline=3 --part=round-trip", "--case='<identity or part of one>'", "--lower", "--jobs=<n>") with exit-code semantics, timing/case-count expectations, real example finding output, and a concrete three-way triage procedure. These cover the common cases.

Workflow Clarity

The multi-step process is clearly sequenced (run the gate → read a failure → triage real bug vs modeling error vs intended change → fix → run --lower) with explicit validation checkpoints (exit 0/1/2 meanings, the GATE_CASES count check, baseline comparison) and feedback loops ("the gate fails until you run pnpm check:markdown-round-trip --lower"; "Never weaken a rule or add a baseline entry to get green"), plus a three-point re-check checklist for the coverage record. As a batch operation it has validation, so the cap at 3 does not apply.

Progressive Disclosure

No bundle files exist, and while the single SKILL.md has well-organized section headers, substantial content that belongs in separate one-level-deep reference files — the Findings class catalog, the planted-bug validation history, and the coverage-record table — is inlined in the monolithic body. Not 4: the inlining is substantial rather than a minor organization gap; not 2: the section structure itself is clear and easy to navigate.

Specificity

The description lists multiple concrete actions — "parses, serializes and parses again to the same document" and "a streamed parse that continues its previous result equals a fresh parse at every chunking" — comprehensively covering both verification rules the skill performs. Not 4: there is no gap in the actions described for what this check does.

Completeness

Both questions are explicitly answered: the "what" states both verification properties concretely, and the "when" gives concrete trigger phrases ("Use before and after changing packages/platejs/src/markdown/lib… when the markdown-round-trip step of pnpm check fails, or when fixing a Markdown or streaming bug"). This matches the 5 anchor exactly.

Trigger Term Quality

Good natural keyword coverage: "Markdown", "streamed parse", "markdown-round-trip step of pnpm check", "streaming bug", and the concrete path "packages/platejs/src/markdown/lib". Not 5: a few natural phrasings a user might say (e.g. "serialization", "round trip" as a standalone phrase) are missing, and terms like "a seed or a tester found" are repo jargon rather than user vocabulary.

Distinctiveness Conflict Risk

A clear niche — this repository's Markdown round-trip and streaming verification gate — with triggers tied to specific paths and a named check step, so it is unlikely to fire for any other skill. Not 4: overlap risk is effectively nil given the path- and check-name-specific triggers.