Claude Code Plugins Directory is a marketplace containing plugins for Claude Code, including tools, commands, skills, agents, hooks, and model context servers. Claude Code users browse it to install Anthropic-maintained or approved third-party extensions.
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 anthropics/claude-plugins-official --skill math-olympiadgit clone --depth 1 https://github.com/anthropics/claude-plugins-officialWrote 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/anthropics/claude-plugins-official/math-olympiad)<a href="https://agentmods.dev/skills/anthropics/claude-plugins-official/math-olympiad"><img src="https://agentmods.dev/badge/skills/anthropics/claude-plugins-official/math-olympiad/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/anthropics/claude-plugins-official/math-olympiad"><img src="https://agentmods.dev/badge/skills/anthropics/claude-plugins-official/math-olympiad.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk pass
- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium Prompt Injection · line 165 Large whitespace padding was detected (a block of blank lines or a long run of spaces). This can push injected instructions below or to the right of the visible area so a human reviewer never sees them while the agent still reads them. Manual review of the hidden content is recommended.Fix: Remove the large whitespace padding (blank-line blocks or long space runs) and review any content hidden below or to the right of it. Keep skill files compact and reviewable so no instructions can be
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 | $0.00163 | $0.04533 |
| Opus 5 | $0.00081 | $0.02266 |
| Sonnet 5 | $0.00033 | $0.00907 |
| Haiku 4.5 | $0.00016 | $0.00453 |
Grade A, and why
math-olympiad 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 5d 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.
Copies of this mod
5 near-identical copies found in the catalogue:
- math-olympiad — 100% identical, 21 lines differ
- math-olympiad — 100% identical, 0 lines differ
- math-olympiad — 100% identical, 0 lines differ
- math-olympiad — 100% identical, 0 lines differ
- math-olympiad — 100% identical, 0 lines differ
How it starts
The opening of the file, as written. The whole thing — 412 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Math Olympiad Solver
The five things that change outcomes
- Strip thinking before verifying — a verifier that sees the reasoning is biased toward agreement. Fresh context, cleaned proof only.
- "Does this prove RH?" — if your theorem's specialization to ζ is a famous open problem, you have a gap. Most reliable red flag.
- Short proof → extract the general lemma — try 2×2 counterexamples. If general form is false, find what's special about THIS instance.
- Same gap twice → step back — the case split may be obscuring a unified argument. Three lines sometimes does what twelve pages couldn't.
- Say "no confident solution" — wrong-and-confident is worse than honest abstain.
Tool policy: Solvers and verifiers use THINKING ONLY in the tight-budget workflow. Competition math is reasoning. Computation is for deep mode (§6c), and even then bounded — a recurrence that's doubly-exponential can't be computed past n~30, work mod 2^m instead.
When to use which approach
| Problem | Approach | Verification |
|---|---|---|
| AIME numeric answer | Best-of-N → majority vote | Answer check only |
| Olympiad proof (IMO/Putnam/USAMO) | Full workflow below | 5-pass adversarial |
| "Is this proof correct?" | Skip to verification (step 4) | Adversarial + spec-gaming |
| Full problem set (e.g. all 6 from a competition) | Sequential: one full workflow per problem, collect results, compile single PDF | Per-problem adversarial |
What ships with it
10 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.
- evals/trigger_eval.json 2.0 KB
- references/adversarial_prompts.md 12 KB
- references/attempt_agent.md 1.9 KB
- references/known_constructions.md 2.0 KB
- references/model_tier_defaults.md 2.9 KB
- references/presentation_prompts.md 6.0 KB
- references/solver_heuristics.md 5.9 KB
- references/verifier_patterns.md 8.1 KB
- scripts/check_latex.sh 205 B runs code
- scripts/compile_pdf.sh 1.5 KB runs code
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.
- 5d ago First seen · 412 lines · 163 tokens per session scan A f697e195d343
math-olympiad is a skill published in the GitHub repository anthropics/claude-plugins-official (36,026 stars, last pushed yesterday), licensed Apache-2.0. It adds 163 tokens to every session and 4,533 once invoked, about $0.0008 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 2026-09-03.
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