Borrowing it
Nothing to install: this file belongs to friedbotstudio/baseline. 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/friedbotstudio/baseline/main/.claude/skills/spec-lint/SKILL.mdgit clone --depth 1 https://github.com/friedbotstudio/baselineWrote 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/friedbotstudio/baseline/spec-lint)<a href="https://agentmods.dev/skills/friedbotstudio/baseline/spec-lint"><img src="https://agentmods.dev/badge/skills/friedbotstudio/baseline/spec-lint/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/friedbotstudio/baseline/spec-lint"><img src="https://agentmods.dev/badge/skills/friedbotstudio/baseline/spec-lint.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00071 | $0.00929 |
| Opus 5.5 | $0.00028 | $0.00372 |
| Sonnet 5.5 | $0.00014 | $0.00186 |
| Haiku 4.5 | $0.00007 | $0.00093 |
Grade A, and why
spec-lint 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.
How it starts
The opening of the file, as written. The whole thing — 76 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Checker config (tier-dial:read-path): this checker's floor/ceiling come from the tier dial at
.claude/hooks/lib/tier-dial.mjsviaresolveCheckerThreshold('spec'). Advisory only this slice (v1 piece 2); blocking is piece 5.
spec-lint — preflight a spec draft
Invocable by both user (/spec-lint <slug>) and Claude (when iterating on a spec and wanting to check status before writing).
What it checks
Five checks always run, same logic as the hooks, but advisory (no writes are blocked). One more appears only when its trigger fires.
Checks are identified by row name, in the order the report prints them. Ordinals are deliberately
absent: they have already drifted once — lint.mjs labels the codesign check "#4" in its own comment
while the report prints it last — and a number that means one thing in the source and another in the
table is worse than no number.
| Check | Row name | Hook it mirrors |
|---|---|---|
Every plantuml fence parses under plantuml -checkonly |
plantuml_syntax |
plantuml_syntax_guard |
Required diagram kinds present (config: project.json → artifacts.required_diagrams.spec) |
diagram_presence |
spec_diagram_presence_guard |
Every AC-NNN row in the Acceptance criteria table references a §Behavior #N section that exists |
ac_traceability |
(no hook — unique to the lint) |
Each ## Design calls row carries a populated Reference target and Quality criteria |
design_calls |
spec_design_calls_guard |
Each ## System delta row resolves — an add anchors inside the governed surface, a change/remove names an existing element |
system_delta |
(no hook — the guard checks only that the section is present) |
| Conditional check | Row name | Fires when |
|---|---|---|
A ## Decisions section is present |
codesign_decisions |
workflow.json → codesign_mode is true |
system_delta reports SKIP when project.json → memory.architecture_map.enabled is not true. The
corpus at docs/system/ is opt-in, so a project that has not adopted it declares no delta and the
check has nothing to resolve.
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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 First seen · 76 lines · 71 tokens per session scan A c78fcebc63be
spec-lint is a skill published in the GitHub repository friedbotstudio/baseline (14 stars, last pushed 13d ago), licensed Apache-2.0. It adds 71 tokens to every session and 929 once invoked, about $0.0003 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 2026-08-30.
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