agentmods.dev

PostToolUse

PostToolUse is a hook for Claude Code from Uncle-Peke/ui-chan-mcp. Its token cost is not measured, scanned A, original, MIT.

A hook that runs reaction.js after Bash, Edit, Write, NotebookEdit, or MultiEdit tool calls finish. A hook is an automatic action attached to another action.

In plain words
What is it for?
Use it to trigger post-call processing after shell commands and file or notebook edits. The description does not specify what reaction.js does.
Why use it?
It removes the need to run the same follow-up script manually after each listed tool call.

Hook for Claude Code

Written for Claude Code: ${CLAUDE_PLUGIN_ROOT} variable. Also seen: names the NotebookEdit tool.

Runs only inside its plugin — its command needs a path that Claude Code sets for a plugin’s own hooks and for nothing else. Install the plugin, not this.

Part of the ui-chan plugin — 4 skills, 2 agents, 7 hooks, 1 MCP server shipped together

One of 7 entries in hooks.json — they are configured in one file and arrive together.

not rated 0repo today A scan tokens not measured original MIT

Good fit Use it to trigger post-call processing after shell commands and file or notebook edits. The description does not specify what reaction.js does.

Compare 6 hooks from other repositories ↓
View source ↗ Uncle-Peke/ui-chan-mcp
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 Uncle-Peke/ui-chan-mcp
Claude Code
/plugin install ui-chan

Made for: Claude Code.

Or install ui-chan, the plugin that ships this one along with the rest of its 4 skills, 2 agents, 7 hooks, 1 MCP server.

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.

agentmods badge for PostToolUse

README.md
[![agentmods](https://agentmods.dev/badge/hooks/uncle-peke/ui-chan-mcp/post-tool-use.svg)](https://agentmods.dev/hooks/uncle-peke/ui-chan-mcp/post-tool-use)
Your own site
<a href="https://agentmods.dev/hooks/uncle-peke/ui-chan-mcp/post-tool-use"><img src="https://agentmods.dev/badge/hooks/uncle-peke/ui-chan-mcp/post-tool-use.svg" alt="Measured on agentmods" 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 6d 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.

hooks/hooks.json · 13 lines

What it actually says

{
  "PostToolUse": [
    {
      "matcher": "Bash|Edit|Write|NotebookEdit|MultiEdit",
      "hooks": [
        {
          "type": "command",
          "command": "\"${CLAUDE_PLUGIN_ROOT}/bin/ui-chan-node\" \"${CLAUDE_PLUGIN_ROOT}/hooks/reaction.js\""
        }
      ]
    }
  ]
}
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.

  1. 6d ago First seen · 13 lines scan A f8512946a8ec

Subscribe to this mod's changes

PostToolUse is a hook published in the GitHub repository Uncle-Peke/ui-chan-mcp (0 stars, last pushed today), 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 2026-08-31.

Claude Codeclaude-code-plugindesktop-mascotelectronmcpmodel-context-protocol
Related

Other hooks, from other repositories

UserPromptSubmit

Runs when you submit a prompt, before the agent sees it for /arckit:pages, /arckit:health, /arckit:traceability, /arckit:analyze, /arckit:search, /arckit:impact, /arckit:navigator and /arckit:graph-report tool calls, running node (10 commands). From tractorjuice/arckit-claude.

tractorjuice/arckit-claude · not measured

PreToolUse

Runs before the agent uses a tool for Read, Bash, Agent, Write, Edit and Write tool calls, running node (7 commands). From tractorjuice/arckit-claude.

tractorjuice/arckit-claude · not measured

SessionStart

Runs when a session starts, running node (4 commands). From tractorjuice/arckit-claude.

tractorjuice/arckit-claude · not measured

Stop

Runs when the agent finishes a response, running node. From tractorjuice/arckit-claude.

tractorjuice/arckit-claude · not measured

StopFailure

Runs on the StopFailure event, running node. From tractorjuice/arckit-claude.

tractorjuice/arckit-claude · not measured

TaskCreated

Runs on the TaskCreated event, running node. From tractorjuice/arckit-claude.

tractorjuice/arckit-claude · not measured