An automatic action that runs after a tool finishes editing or writing a file. In this case, it runs shell scripts that analyze and format the code.

Use it to run project analysis and code formatting after file edits. The configured commands are analyze.sh and format.sh, each with a 30-second limit.

It catches problems and applies formatting immediately after changes, reducing the need to run those checks by hand. It applies specifically to Edit and Write operations.

PostToolUse — Hook by VeryGoodOpenSource

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/verygoodopensource/vgv-ai-flutter-plugin/post-tool-use

Clone the repo

git clone --depth 1 https://github.com/VeryGoodOpenSource/vgv-ai-flutter-plugin

Or install vgv-ai-flutter-plugin, the plugin that ships this one along with the rest of its 15 skills, 1 agent, 3 hooks, 2 MCP servers.

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 58% copy Near-identical to another mod 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.

Origin

This is a copy

58% identical to SessionStart — 14 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

hooks/hooks.json · 19 lines

What it actually says

{
  "PostToolUse": [
    {
      "matcher": "Edit|Write",
      "hooks": [
        {
          "type": "command",
          "command": "bash ${CLAUDE_PLUGIN_ROOT}/hooks/scripts/analyze.sh",
          "timeout": 30
        },
        {
          "type": "command",
          "command": "bash ${CLAUDE_PLUGIN_ROOT}/hooks/scripts/format.sh",
          "timeout": 30
        }
      ]
    }
  ]
}

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.

3d ago First seen · 19 lines scan A f5fadba08c3d

Subscribe to this mod's changes

PostToolUse is a hook published in the GitHub repository VeryGoodOpenSource/vgv-ai-flutter-plugin (157 stars, last pushed 13d 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. It is 58% identical to SessionStart, differing in 14 lines, and is treated as a copy.

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PostToolUse

Getting it into your agent

Grade A, and why

Nothing flagged

This is a copy

What it actually says

What this file has done since we first saw it

Other hooks, from other repositories

PreToolUse

PostToolUse

Stop

BeforeTool

SessionEnd

Stop