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 agentmods add skills/duolingo/pre-commit-hooks/my-skillnpx skills add duolingo/pre-commit-hooks --skill my-skillgit clone --depth 1 https://github.com/duolingo/pre-commit-hooksWhat 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 | $0.00007 | $0.00018 |
| Opus 5 | $0.00003 | $0.00009 |
| Sonnet 5 | $0.00001 | $0.00004 |
| Haiku 4.5 | $0.00001 | $0.00002 |
Grade A, and why
my-skill 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 2d 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.
What it actually says
Test skill content.
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.
- 2d ago First seen · 7 lines · 7 tokens per session scan A c7cce4c83b5b
my-skill is a skill published in the GitHub repository duolingo/pre-commit-hooks (68 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 7 tokens to every session and 18 once invoked, about $0.0000 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 2026-08-30.
Other skills, from other repositories
prettier-docs
Prettier 3.9.5 — opinionated code formatter. CLI, API, config, plugins, editor integration, CI.
setup-pre-commit
Use when bootstrapping or extending the pre-commit hook chain (Husky + lint-staged + Prettier + typecheck + integration tests) for an EVOKORE-style TypeScript repo, including detecting an existing setup, surfacing the diff, and never silently overwriting a configured chain.
ruff-docs
Ruff — fast Python linter and formatter in Rust. 900+ rules, Black-compatible formatter, LSP, CI/CD.
type-inference
Use this skill when working on Biome's Salsa-backed JavaScript and TypeScript inference, including type-aware lint rules, raw collection or inferred representations, analyzer requests, tracked queries, import or cycle resolution, profiling, and Salsa invalidation tests. Do not use for standalone CSS/HTML module-graph…
biome-code-review
Use this skill only when asked to review completed Biome changes in a PR, branch, commit range, diff, or working tree. Perform a read-only static review and report findings without editing files or running project code. Do not use for triage, reproduction, or implementation.
doc-comments
Use this skill whenever writing or editing Rust //, ///, or //! comments in Biome, including comments added incidentally and end-user rustdoc inside lint/assist declarations. For lint/assist rustdoc, also load lint-rule-development for content requirements. Do not use for formatter handling of comments in user code.