PostToolUseFailure

PostToolUseFailure is a hook for Claude Code from babamba2/superclaude-for-sap. Its token cost is not measured, scanned A, a copy of SessionStart, MIT.

A failure hook that runs two Node.js commands after any tool call fails: one failure handler and one syntax checker.

In plain words
What is it for?
Triggering failure handling and syntax checks after unsuccessful tool calls.
Why use it?
It automatically records or processes tool failures and checks related code without requiring a separate manual step.

Hook for Claude Code

Written for Claude Code: $CLAUDE_PLUGIN_ROOT variable.

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 sc4sap plugin — 14 skills, 26 agents, 11 hooks, 1 MCP server shipped together

One of 11 entries in hooks.json upstream. Installing this one merges just its entry into your config; the other 10 are separate, each on its own page.

Good fit Triggering failure handling and syntax checks after unsuccessful tool calls.

Compare 6 hooks from other repositories ↓
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 babamba2/superclaude-for-sap
Claude Code
/plugin install sc4sap

Made for: Claude Code.

Or install sc4sap, the plugin that ships this one along with the rest of its 14 skills, 26 agents, 11 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 PostToolUseFailure

README.md
[![agentmods](https://agentmods.dev/badge/hooks/babamba2/superclaude-for-sap/post-tool-use-failure/github.svg)](https://agentmods.dev/hooks/babamba2/superclaude-for-sap/post-tool-use-failure)
Your own site
<a href="https://agentmods.dev/hooks/babamba2/superclaude-for-sap/post-tool-use-failure"><img src="https://agentmods.dev/badge/hooks/babamba2/superclaude-for-sap/post-tool-use-failure/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.

agentmods 80×15 button for PostToolUseFailure

Your own site · 80×15
<a href="https://agentmods.dev/hooks/babamba2/superclaude-for-sap/post-tool-use-failure"><img src="https://agentmods.dev/badge/hooks/babamba2/superclaude-for-sap/post-tool-use-failure.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 84% copy Near-identical to another mod in the catalogue.
Security

Grade A, and why

PostToolUseFailure 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 9d 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

84% identical to SessionStart — 33 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

{
  "PostToolUseFailure": [
    {
      "matcher": "*",
      "hooks": [
        {
          "type": "command",
          "command": "node \"$CLAUDE_PLUGIN_ROOT\"/scripts/run.cjs \"$CLAUDE_PLUGIN_ROOT\"/scripts/post-tool-use-failure.mjs",
          "timeout": 3
        },
        {
          "type": "command",
          "command": "node \"$CLAUDE_PLUGIN_ROOT\"/scripts/run.cjs \"$CLAUDE_PLUGIN_ROOT\"/scripts/syntax-checker.mjs",
          "timeout": 5
        }
      ]
    }
  ]
}
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. 9d ago First seen · 19 lines scan A 4af8537191d0

Subscribe to this mod's changes

PostToolUseFailure is a hook published in the GitHub repository babamba2/superclaude-for-sap (54 stars, last pushed 17d 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 84% identical to SessionStart, differing in 33 lines, and is treated as a copy.