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.
npx skills add hmcts/agentic-plugins-marketplace --skill openapi-spec-reviewergit clone --depth 1 https://github.com/hmcts/agentic-plugins-marketplaceWrote 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/hmcts/agentic-plugins-marketplace/openapi-spec-reviewer)<a href="https://agentmods.dev/skills/hmcts/agentic-plugins-marketplace/openapi-spec-reviewer"><img src="https://agentmods.dev/badge/skills/hmcts/agentic-plugins-marketplace/openapi-spec-reviewer/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/hmcts/agentic-plugins-marketplace/openapi-spec-reviewer"><img src="https://agentmods.dev/badge/skills/hmcts/agentic-plugins-marketplace/openapi-spec-reviewer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00078 | $0.01758 |
| Opus 5 | $0.00039 | $0.00879 |
| Sonnet 5 | $0.00016 | $0.00352 |
| Haiku 4.5 | $0.00008 | $0.00176 |
Grade A, and why
openapi-spec-reviewer 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 9d 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 — 216 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill: OpenAPI Spec Reviewer
Trigger
Invoke this skill when a user provides an OpenAPI v3.x specification (YAML or JSON) and asks for a review, audit, or policy check.
Invocation command: /openapi-spec-reviewer
Prerequisites
Before beginning the review, load and internalise the following knowledge documents as active review lenses. They define the policy constraints against which the spec will be assessed.
The knowledge files are bundled with this skill in its knowledge/ directory
(resolve relative to this SKILL.md):
knowledge/data-sharing-policy.mdknowledge/infrastructure-sla.mdknowledge/api-standards.mdknowledge/security-standards.md
Input Handling
Version Guard
Check the openapi field at the root of the document.
-
If the version is
2.x(i.e. a Swagger/OAS2 spec), stop immediately and respond:Unsupported specification version. This skill only supports OpenAPI 3.x and higher. The provided specification declares
openapi: <detected-version>, which is OpenAPI v2 (Swagger). Please upgrade your spec to OpenAPI 3.0.x or 3.1.x before requesting a review. -
If the
openapifield is absent or the document cannot be parsed, respond:Parse error. The provided input could not be read as a valid OpenAPI document. Please check that:
- The document is valid YAML or JSON
- The root-level
openapifield is present (e.g.openapi: "3.0.3") - All
$refvalues point to resolvable locations
Paste the corrected spec and re-run
/openapi-spec-reviewer. -
If the document is structurally parseable but incomplete (e.g. missing
info,paths, orcomponents), continue the review but flag each missing section as a Critical finding under the relevant lens.
Review Process
Apply each of the four lenses in sequence. For every issue found, record a finding using the structure defined in the Output Format section below.
Lens 1 — Data Sharing Policy
What ships with it
4 files 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.
- 9d ago First seen · 216 lines · 78 tokens per session scan A b368d43d0e1e
openapi-spec-reviewer is a skill published in the GitHub repository hmcts/agentic-plugins-marketplace (3 stars, last pushed today), licensed MIT. It adds 78 tokens to every session and 1,758 once invoked, about $0.0004 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 2026-08-31.
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