agentmods.dev

PostToolUse

A post-tool hook configuration that runs a Python validation script after Write or Edit operations finish. A hook is an automatic command triggered by a specified event.

In plain words
What is it for?
Use it in projects that contain .claude/hooks/validate_brain_file.py and need that script run after Write and Edit tool calls. The configuration comes from phuryn/pm-brain.
Why use it?
It provides an automatic validation step after files are changed, so invalid brain files can be detected immediately. The input does not describe what the validator checks beyond its script name.

Hook for Claude Code

537 +2 3mo ago A scan tokens not measured original MIT
View the source file phuryn/pm-brain
Install

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.

agentmods
npx agentmods add hooks/phuryn/pm-brain/post-tool-use
Clone the repo
git clone --depth 1 https://github.com/phuryn/pm-brain

Made for: Claude Code.

Per session not measured What this adds to a session before it is invoked.
When invoked not measured Not applicable: nothing here is loaded into a session.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Security

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 3d 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.

.claude/skills/pm-brain/scaffold/.claude/settings.json · 13 lines

What it actually says

{
  "PostToolUse": [
    {
      "matcher": "Write|Edit",
      "hooks": [
        {
          "type": "command",
          "command": "python .claude/hooks/validate_brain_file.py"
        }
      ]
    }
  ]
}
Changes

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.

  1. 3d ago First seen · 13 lines scan A 66df3761536e

Subscribe to this mod's changes

PostToolUse is a hook published in the GitHub repository phuryn/pm-brain (537 stars, last pushed 3mo 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. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Testingclaude-codesecond-brain
Related

Other hooks, from other repositories

Stop

Runs when the agent finishes a response, running python3. From AgriciDaniel/claude-obsidian.

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PostToolUse

Runs after a tool call finishes for Write, Edit, MultiEdit, NotebookEdit and create_file tool calls, executing validate-ai-first.sh. From eugeniughelbur/obsidian-second-brain.

eugeniughelbur/obsidian-second-brain · not measured

SessionStart

Runs when a session starts, executing load_vault_context.py via python3. From eugeniughelbur/obsidian-second-brain.

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PostToolUse

Runs after a tool call finishes for Read tool calls, executing run-hook.cmd. From guhcostan/claude-mega-brain.

guhcostan/claude-mega-brain · not measured

PostToolUse

Runs after a tool call finishes for Write tool calls, executing prp-confidence-check.py. From TheSmokeDev/taskchad-os.

TheSmokeDev/taskchad-os · not measured

SessionEnd

Runs when a session ends for prompt_input_exit, clear and other tool calls, executing session-end-flush.py. From TheSmokeDev/taskchad-os.

TheSmokeDev/taskchad-os · not measured