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little-canary

80 / 100 · Low risk

Fine to try. Some of what it can do is expected: a coding skill usually runs build and test commands.

By hermes-labs-ai/little-canary (GitHub) · coding · 41 stars · scanned at commit 4b80a14

Use when you need to screen inbound untrusted text before it reaches a primary model — detecting prompt injection by its behavioral effect on a sacrificial canary model, not just pattern matching — and want a block/flag/pass routing decision plus explicit behavioral-coverage state. Inbound preflight sensor, not a guarantee.

Works with any agent that supports SKILL.md skills.

What this skill can do

Install

Paste this into your terminal. It downloads exactly the version we scanned, not whatever is newest.

if [ -e ~/.agents/skills/'little-canary' ] || [ -L ~/.agents/skills/'little-canary' ]; then echo 'A skill folder named little-canary already exists — not replacing it' >&2; false; else d=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/hermes-labs-ai/little-canary' "$d" && git -C "$d" checkout --quiet '4b80a143bd2e4a584e857f4355adef1142f18925' -- '.agents/skills/little-canary' && mkdir -p ~/.agents/skills && cp -R "$d"/'.agents/skills/little-canary' ~/.agents/skills/'little-canary' && rm -rf "$d"; fi

Codex reads ~/.agents/skills directly. For Claude Code, Cursor, Copilot, Gemini CLI, Antigravity or OpenCode, also link it. For Claude Code: ln -s ~/.agents/skills/'little-canary' ~/.claude/skills/'little-canary' (other agents: ~/.cursor/skills, ~/.copilot/skills, ~/.gemini/skills, ~/.gemini/config/skills, ~/.config/opencode/skills). Or install through the finder skill, which does both.

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