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 instructions/duolingo/pre-commit-hooks/copilot-instructionsgit 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 | $0.00336 | $0.00336 |
| Opus 5 | $0.00168 | $0.00168 |
| Sonnet 5 | $0.00067 | $0.00067 |
| Haiku 4.5 | $0.00034 | $0.00034 |
Grade A, and why
pre-commit-hooks copilot-instructions.md 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
Development Rules
Each rule below has the following properties:
- Description: Tells you exactly when to read and apply this rule to your current task
- File scope: Defines which files/directories this rule applies to
- Always apply: false = apply only when relevant; true = always apply this rule
Read the properties of each rule and apply those that match your current task. When you decide to apply a rule, you MUST read the entire contents of the actual rule file using the file path shown
Architecture
Architecture Rule → @.cursor/rules/architecture/architecture-rule.mdc
- Description: Architecture rule description
- File scope: **/*.swift
- Always apply: false
Build Deploy
Github Actions → @.cursor/rules/build-deploy/github-actions.mdc
- Description: GitHub Actions workflow guidelines
- File scope: **/.github/workflows/.yml, /.github/actions//.yml
- Always apply: false
Root
Rule → @.cursor/rules/rule.mdc
- Description: Rule description
- File scope: All files
- Always apply: false
Testing
Testing Rule → @.cursor/rules/testing/testing-rule.mdc
- Description: Testing rule description
- File scope: **/*Test.swift
- Always apply: true
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 · 48 lines · 336 tokens per session scan A 0bdacb5b88c1
pre-commit-hooks copilot-instructions.md is an instructions file published in the GitHub repository duolingo/pre-commit-hooks (68 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 336 tokens to every session, about $0.0017 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.
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