agentmods.dev

PostToolUse

A post-tool hook that runs selected commands after agent, web, search, MCP, question and file or shell tools finish.

In plain words
What is it for?
Running safety checks on web and external-tool calls, recording agent activity and updating tab or work state after tools run.
Why use it?
It adds automatic checks and state updates around tool use, helping the agent track safety and session changes.

Hook

19k 18d ago A scan tokens not measured original MIT
View the source file danielmiessler/LifeOS
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/danielmiessler/lifeos/post-tool-use
Clone the repo
git clone --depth 1 https://github.com/danielmiessler/LifeOS
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.

LifeOS/install/hooks/hooks.json · 213 lines

How it starts

The opening of the file, as written. The whole thing — 213 lines — stays where its author put it; the contents beside it link to each section on GitHub.

{
  "PostToolUse": [
    {
      "matcher": "Agent",
      "hooks": [
        {
          "type": "command",
          "command": "$HOME/.claude/hooks/AgentInvocation.hook.ts"
        }
      ]
    },
    {
      "matcher": "WebFetch",
      "hooks": [
        {
          "type": "command",
          "command": "$HOME/.claude/hooks/Safety.hook.ts",
          "timeout": 5
        }
      ]
    },
    {
      "matcher": "WebSearch",
      "hooks": [
        {
          "type": "command",
          "command": "$HOME/.claude/hooks/Safety.hook.ts",
          "timeout": 5
        }
      ]
    },
    {
      "matcher": "mcp__.*",
      "hooks": [
        {
          "type": "command",
          "command": "$HOME/.claude/hooks/Safety.hook.ts",
          "timeout": 5
        }
      ]
    },
    {
      "matcher": "ToolSearch",
      "hooks": [
        {
          "type": "command",
          "command": "$HOME/.claude/hooks/Safety.hook.ts",
          "timeout": 5
        }
      ]
    },
    {
      "matcher": "AskUserQuestion",
      "hooks": [
        {
          "type": "command",
          "command": "$HOME/.claude/hooks/TabState.hook.ts"
        }
      ]
    },
    {
      "matcher": "Read",
      "hooks": [
        {
          "type": "command",
          "command": "$HOME/.claude/hooks/ISAStaleWriteGuard.hook.ts"
        }
      ]
    },
    {
      "matcher": "Write",
      "hooks": [
        {
          "type": "command",
          "command": "$HOME/.claude/hooks/ISASync.hook.ts"
        },
        {
          "type": "command",
          "command": "$HOME/.claude/hooks/ISAStaleWriteGuard.hook.ts"
        },
        {
          "type": "command",
          "command": "$HOME/.claude/hooks/CheckpointPerISC.hook.ts",
          "timeout": 30
        },
        {
          "type": "command",
          "command": "$HOME/.claude/hooks/ConfigEvalFire.hook.ts"
        },
        {
          "type": "command",
          "command": "$HOME/.claude/hooks/AtlasEventCapture.hook

Read the full file on GitHub · 213 lines

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 · 213 lines scan A 5004a9c918b7

Subscribe to this mod's changes

PostToolUse is a hook published in the GitHub repository danielmiessler/LifeOS (18,798 stars, last pushed 18d 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.

aiai-harnessaugmentationhumansintent-engineering
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PreToolUse

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UserPromptSubmit

Runs when you submit a prompt, before the agent sees it, executing skill-keyword-injector.js and svop-injector.js via node (2 commands). From Global-mindee/WAY.

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SessionStart

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