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 hooks/q00/ouroboros/post-tool-usegit clone --depth 1 https://github.com/Q00/ouroborosWrote 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/hooks/q00/ouroboros/post-tool-use)<a href="https://agentmods.dev/hooks/q00/ouroboros/post-tool-use"><img src="https://agentmods.dev/badge/hooks/q00/ouroboros/post-tool-use.svg" alt="Measured on agentmods" height="20"></a>Grade A, and why
PostToolUse 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 4d ago.
A static scan of the commands this hook runs, not an audit. A hook is shell that executes on your machine at the event it names, which is why every command in it is printed with what was found.
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.
This is a copy
86% identical to UserPromptSubmit — 7 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
What it actually says
{
"PostToolUse": [
{
"matcher": "Write|Edit",
"hooks": [
{
"type": "command",
"command": "ROOT=\"${PLUGIN_ROOT:-${CLAUDE_PLUGIN_ROOT:-$PWD}}\"; SCRIPT=\"$ROOT/scripts/drift-monitor.py\"; if [ ! -r \"$SCRIPT\" ]; then printf '%s\\n' \"Ouroboros hook skipped: $SCRIPT is unavailable.\" >&2; exit 0; fi; if command -v python3 >/dev/null 2>&1; then PYTHON=python3; elif command -v python >/dev/null 2>&1; then PYTHON=python; else printf '%s\\n' 'Ouroboros hook skipped: Python is unavailable.' >&2; exit 0; fi; \"$PYTHON\" \"$SCRIPT\" || { STATUS=$?; printf '%s\\n' \"Ouroboros hook failed open: $SCRIPT exited with code $STATUS.\" >&2; exit 0; }",
"timeout": 3
}
]
}
]
}What else settings.json configures
This page is one entry in a file that holds 3. Installing the file brings all of them; each is measured and scanned on its own page.
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.
- 4d ago First seen · 14 lines scan A 028b59124d60
PostToolUse is a hook published in the GitHub repository Q00/ouroboros (5,747 stars, last pushed 2d ago), licensed MIT. Its token cost is not measured: a hook is shell that never enters the context. A static security scan graded it A with 0 findings. It is 86% identical to UserPromptSubmit, differing in 7 lines, and is treated as a copy.
Other hooks, from other repositories
PreToolUse
Runs before the agent uses a tool for Edit, Write, Edit and Write tool calls, running an inline shell check (2 commands). From deepklarity/harness-kit.
PostCompact
Runs after the context is compacted, running bar-hook PostCompact. From bar181/bar-observatory.
StopFailure
Runs on the StopFailure event, running an inline shell check. From microsoft/intelligent-terminal.
PreToolUse
Runs before the agent uses a tool for Write, Edit, Bash, Agent, Task, SendMessage and TaskStop tool calls, running bash (3 commands). From modu-ai/moai-adk.
SubagentStop
Runs when a subagent finishes, executing collector-hook.js via node. From core0-io/nio.
Stop
Runs when the agent finishes a response, executing hooks.py via python3. From shanraisshan/codex-cli-best-practice.