Observed arrival · 2026-10-06
Brakelog, a flight recorder for coding agents
An open-source Claude Code hook that records tool calls, blocks selected risky actions, and lets you pause an agent mid-run.
○Open
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✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- People running Claude Code with tool-call guardrails
- Worth noticing
- The limits section says someone outside the agent with access to its log folder could rewrite the chain; saving the head hash elsewhere helps prove earlier entries.
Field notes
Claude Code invokes the hook before each tool call; the page describes checks against a policy and pause flag, followed by a hash-chained JSONL record. Setup starts with a Python script that prints hook configuration, and an audit mode can show prospective blocks without enforcing them. The page also makes the integrity limitation explicit: a hash chain alone does not protect against someone outside the agent who can edit the log folder.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
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