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@tethral/acr-hook

v0.2.1

Published

Claude Code PreToolUse/PostToolUse hook that emits ACR receipts for every tool call your agent makes. Host-side observation — no log_interaction calls required. Pairs with @tethral/acr-mcp for querying the resulting interaction profile.

Vulnerabilities

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Links

Maintainers

tethralaitethralai

Keywords

acrclaude-codehookobservationagent

Readme

@tethral/acr-hook

Claude Code hook that emits ACR receipts for every tool call.

Observation at the transport boundary — no agent cooperation required. Works alongside @tethral/acr-mcp: the MCP observes MCP-transported activity, this hook observes Claude Code's built-in tools (Bash, Read, Write, WebFetch, Task, …) and its connected MCP servers.

Install

npm install -g @tethral/acr-hook

Configure

Add to ~/.claude/settings.json:

{
  "hooks": {
    "PreToolUse":  [{ "matcher": ".*", "hooks": [["npx", "@tethral/acr-hook", "pre"]] }],
    "PostToolUse": [{ "matcher": ".*", "hooks": [["npx", "@tethral/acr-hook", "post"]] }]
  }
}

The hook reads agent_id and api_url from ~/.claude/.acr-state.json, which @tethral/acr-mcp writes on first registration. No per-user config needed.

What gets observed

Every tool call Claude Code makes, mapped to a canonical target:

| Tool | Target | |-----------------------|------------------------| | Bash | tool:bash | | Read / Write / Edit | tool:fs-* | | Grep / Glob | tool:fs-* | | Task | agent:subagent | | WebFetch | api:<hostname> | | WebSearch | api:web-search | | mcp__<server>__<tool> | mcp:<server> |

Receipts carry source='claude-code-hook' so the dashboard can filter them out of agent-reported totals or surface them as a separate cohort.

Fire-and-forget

The hook never blocks the tool call. Timeouts are 1.5s on the receipt POST; if ACR is unreachable or slow, the receipt is dropped silently. Stdout and stderr are never written to (would interleave with tool output).