A set of automatic actions that run after certain coding-agent tools finish, such as writing, editing, reading, or running a task. The listed actions run JavaScript files that record learning, retrieved reading, or search activity.

Use it to trigger post-action processing after writes, edits, tasks, skills, reads, and selected episodic-memory searches.

It adds follow-up processing after selected agent actions without requiring the agent to start each action manually. The input does not explain what those scripts ultimately change or report.

PostToolUse — Hook for Claude Code by robinslange/learning-loop

Install

Getting it into your agent

This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.

Claude Code

/plugin marketplace add robinslange/learning-loop

Claude Code

/plugin install learning-loop

Made for: Claude Code.

Or install learning-loop, the plugin that ships this one along with the rest of its 24 skills, 20 agents, 7 hooks.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/hooks/robinslange/learning-loop/post-tool-use/github.svg)](https://agentmods.dev/hooks/robinslange/learning-loop/post-tool-use)

Your own site

<a href="https://agentmods.dev/hooks/robinslange/learning-loop/post-tool-use"><img src="https://agentmods.dev/badge/hooks/robinslange/learning-loop/post-tool-use/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/hooks/robinslange/learning-loop/post-tool-use"><img src="https://agentmods.dev/badge/hooks/robinslange/learning-loop/post-tool-use.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

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. A grade says what 26 rules found in the file — not that it is safe.

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 1mo 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.

plugin/hooks/hooks.json · 34 lines

What it actually says

{
  "PostToolUse": [
    {
      "matcher": "Write|Edit|Task|Skill|Agent",
      "hooks": [
        {
          "type": "command",
          "command": "cd \"$HOME\" && node \"${CLAUDE_PLUGIN_ROOT}/hooks/run.mjs\" hooks/post-tool.js",
          "timeout": 12
        }
      ]
    },
    {
      "matcher": "Read",
      "hooks": [
        {
          "type": "command",
          "command": "cd \"$HOME\" && node \"${CLAUDE_PLUGIN_ROOT}/hooks/run.mjs\" hooks/post-read-retrieval.js",
          "timeout": 5
        }
      ]
    },
    {
      "matcher": "mcp__plugin_episodic-memory",
      "hooks": [
        {
          "type": "command",
          "command": "cd \"$HOME\" && node \"${CLAUDE_PLUGIN_ROOT}/hooks/run.mjs\" hooks/post-search-tracking.js",
          "timeout": 5
        }
      ]
    }
  ]
}

Same file

What else `hooks.json` configures

This page is one entry in a file that holds 7. Installing the file brings all of them; each is measured and scanned on its own page.

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.

1mo ago Changed 33a088755270
2mo ago Changed 509c99fd0e91
2mo ago First seen · 34 lines scan A 1f0a400cdb47

Subscribe to this mod's changes

PostToolUse is a hook published in the GitHub repository robinslange/learning-loop (13 stars, last pushed 4d ago), licensed Apache-2.0. 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.

PostToolUse next to 6 hooks from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
PostToolUserobinslange/learning-loop	Hook	13	4d ago	Apache-2.0	A	—	Claude Code
PostToolUsesupabase/supabase	Hook	115k	yesterday	Apache-2.0	A	—	Claude Code
SessionStartsupabase/supabase	Hook	115k	yesterday	Apache-2.0	A	—	Claude Code
SessionStartgoogle-gemini/gemini-cli	Hook	109k	yesterday	Apache-2.0	A	—	Claude Code
PreToolUseapache/superset	Hook	75k	yesterday	Apache-2.0	A	—	Claude Code
PreToolUseanthropics/claude-cookbooks	Hook	54k	2d ago	MIT	A	—	Claude Code
PostToolUseanthropics/claude-plugins-official	Hook	46k	yesterday	Apache-2.0	A	—	Claude Code

PostToolUse