agentmods.dev

PostToolUseFailure

A hook that runs a Bash script when another tool call fails.

In plain words
What is it for?
It helps run context-awareness-hook.sh after tool errors.
Why use it?
It gives the add-on a defined point to react to failed tool calls and update the session context.

Hook

21 1mo ago A scan tokens not measured no licence
View the source file hesreallyhim/really-claude-code
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/hesreallyhim/really-claude-code/post-tool-use-failure
Clone the repo
git clone --depth 1 https://github.com/hesreallyhim/really-claude-code
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 unknown No closer match found 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 yesterday.

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.

agent-autonomy/context-awareness/hooks/hooks.json · 13 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

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. yesterday First seen · 13 lines scan A fcadd0db4bde

Subscribe to this mod's changes

PostToolUseFailure is a hook published in the GitHub repository hesreallyhim/really-claude-code (21 stars, last pushed 1mo ago), with no licence file. 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.

Autonomous AgentsMemory and contextagentic-codingagentic-engineeringclaude-codeclaude-code-plugincontext
Related

Other hooks, from other repositories

FileChanged

Runs on the FileChanged event for .envrc, .env and .env.local tool calls, executing hooks.py via python3. From shanraisshan/claude-code-best-practice.

shanraisshan/claude-code-best-practice · not measured

PreToolUse

Runs before the agent uses a tool, executing hooks.py via python3. From shanraisshan/claude-code-best-practice.

shanraisshan/claude-code-best-practice · not measured

Setup

Runs once when the project is set up, executing hooks.py via python3. From shanraisshan/claude-code-best-practice.

shanraisshan/claude-code-best-practice · not measured

PostToolUse

Runs after a tool call finishes, executing hooks.py via python3. From shanraisshan/claude-code-best-practice.

shanraisshan/claude-code-best-practice · not measured

UserPromptExpansion

Runs to expand your prompt before the agent sees it, executing hooks.py via python3. From shanraisshan/claude-code-best-practice.

shanraisshan/claude-code-best-practice · not measured

Notification

Runs when the agent sends a notification, executing hooks.py via python3. From shanraisshan/claude-code-best-practice.

shanraisshan/claude-code-best-practice · not measured