What is plugin-review?

A review tool for checking Base MCP plugin files against the current Plugin Specification. MCP is a standard way for AI tools to connect to external services.

Use it to self-check a plugin, review a pull request, fetch the current specification, and produce actionable conformance findings.

It finds specification and language problems before a plugin is submitted or merged.

plugin-review — Skill by base

Install

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.

agentmods

npx agentmods add skills/base/skills/plugin-review

Any agent

npx skills add base/skills --skill plugin-review

Clone the repo

git clone --depth 1 https://github.com/base/skills

Made for: Claude Code, Codex.

Per session 95 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,166 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 1 finding. Scan, not verified.

Origin original No closer match found in the catalogue.

Token cost

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	$0.00095	$0.01166
Opus 5	$0.00048	$0.00583
Sonnet 5	$0.00019	$0.00233
Haiku 4.5	$0.00010	$0.00117

Measured yesterday against content hash 81fcf80b4121, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

plugin-review scanned grade A with 1 finding 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 yesterday.

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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

curl -s https://raw.githubusercontent.com/base/skills/master/skills/base-mcp/references/plugin-spec.md

.claude/skills/plugin-review/SKILL.md · 52 lines

How it starts

The opening of the file, as written. The whole thing — 52 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Plugin Review

Validate Base MCP plugin files against the current Plugin Specification. Produces a conformance report with actionable findings.

Works for both authors (self-check before submitting a PR) and reviewers (evaluate an incoming PR).

Workflow

Fetch the current spec (it changes — never rely on a stale copy):
```
curl -s https://raw.githubusercontent.com/base/skills/master/skills/base-mcp/references/plugin-spec.md
```
Related docs worth reading: references/custom-plugins.md, references/approval-mode.md, references/batch-calls.md, and SKILL.md (the root skill). Existing native plugins under skills/base-mcp/plugins/ are the precedent for conventions.

Read the plugin file in full. If reviewing a PR:

gh pr view <n> --repo base/skills --json title,body,number,headRefName,files,additions,deletions
gh pr diff <n> --repo base/skills
# raw plugin file (diff may be truncated):
gh api "repos/base/skills/pulls/<n>/files" --jq '.[] | select(.filename|endswith(".md")) | .raw_url'

Static conformance evaluation — assess against every dimension in references/evaluation-criteria.md (includes compliance/language checks and high-risk category gates). Write the report using references/report-template.md.
(Optional) Live API / SDK verification — exercise the documented endpoints/SDK/contracts with read-only calls. See references/live-testing.md. For perps/prediction-market/gambling plugins, also run the geoblock verification (compare frontend vs API access restrictions). Append a ## Live API / SDK Verification section to the report. This routinely overturns doc claims (fabricated/locked endpoints, broken hosts, wrong response shapes).
Save the report. If reviewing a PR and asked to comment, draft a PR comment from the report using references/comment-guidelines.md and post with: gh pr comment <n> --repo base/skills --body-file <comment-file>.

Multiple PRs

Read the full file on GitHub · 52 lines

Files

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.

Changes

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.

yesterday First seen · 52 lines · 95 tokens per session scan A 81fcf80b4121

Subscribe to this mod's changes

plugin-review is a skill published in the GitHub repository base/skills (114 stars, last pushed 8d ago), licensed MIT. It adds 95 tokens to every session and 1,166 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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plugin-review