Borrowing it
Nothing to install: this file belongs to christopherlouet/claude-base. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/christopherlouet/claude-base/main/.claude/settings.jsongit clone --depth 1 https://github.com/christopherlouet/claude-baseWrote 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.
[](https://agentmods.dev/hooks/christopherlouet/claude-base/pre-tool-use)<a href="https://agentmods.dev/hooks/christopherlouet/claude-base/pre-tool-use"><img src="https://agentmods.dev/badge/hooks/christopherlouet/claude-base/pre-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.
<a href="https://agentmods.dev/hooks/christopherlouet/claude-base/pre-tool-use"><img src="https://agentmods.dev/badge/hooks/christopherlouet/claude-base/pre-tool-use.svg" alt="Reviewed on agentmods" width="80" height="20"></a>Grade A, and why
PreToolUse 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 10d 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.
How it starts
The opening of the file, as written. The whole thing — 136 lines — stays where its author put it; the contents beside it link to each section on GitHub.
{
"PreToolUse": [
{
"description": "Prevent modifications on the main/master branch (disable with ALLOW_MAIN_EDIT=1)",
"matcher": "Edit|Write|MultiEdit|NotebookEdit",
"hooks": [
{
"type": "command",
"command": "bash \"$CLAUDE_PROJECT_DIR/scripts/hooks/main-branch-guard.sh\"",
"timeout": 30,
"onFailure": "block"
}
]
},
{
"description": "Block hardcoded secrets before writing (built-in zero-dep scan; also runs gitleaks if present). Disable with SKIP_SECRET_SCAN=1",
"matcher": "Edit|Write|MultiEdit|NotebookEdit",
"hooks": [
{
"type": "command",
"command": "bash \"$CLAUDE_PROJECT_DIR/scripts/hooks/secret-scan.sh\"",
"timeout": 30,
"onFailure": "block"
}
]
},
{
"description": "Run tests before a commit (disable with SKIP_PRE_COMMIT_TESTS=1). Detects Husky and adapts behavior.",
"matcher": "Bash",
"hooks": [
{
"type": "command",
"command": "bash \"$CLAUDE_PROJECT_DIR/scripts/hooks/pre-commit-tests.sh\"",
"timeout": 1800,
"onFailure": "block"
}
]
},
{
"description": "Check local CI before git push (disable with SKIP_PRE_PUSH_CI=1)",
"matcher": "Bash",
"hooks": [
{
"type": "command",
"command": "bash \"$CLAUDE_PROJECT_DIR/scripts/hooks/pre-push-ci.sh\"",
"timeout": 1800,
"onFailure": "block"
}
]
},
{
"description": "Mandatory confirmation before destructive operations on data (disable with SKIP_DESTRUCTIVE_CHECK=1)",
"matcher": "Bash",
"hooks": [
{
"type": "command",
"command": "bash \"$CLAUDE_PROJECT_DIR/scripts/hooks/destructive-ops.sh\"",
"timeout": 30,
"onFailure": "block"
}
]
},
{
"description": "Pre-deploy safety: verify buiWhat else settings.json configures
This page is one entry in a file that holds 18. Installing the file brings all of them; each is measured and scanned on its own page.
- Settings file claude-base D not measured
- Hook Elicitation A not measured
- Hook ElicitationResult A not measured
- Hook InstructionsLoaded A not measured
- Hook Notification A not measured
- Hook PermissionDenied A not measured
- Hook PostCompact A not measured
- Hook PostToolUse A not measured
- Hook PostToolUseFailure A not measured
- Hook PreCompact A not measured
- Hook SessionEnd A not measured
- Hook SessionStart A not measured
- Hook Setup A not measured
- Hook SubagentStop A not measured
- Hook TaskCompleted A not measured
- Hook TeammateIdle A not measured
- Hook UserPromptSubmit A not measured
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.
- 10d ago Changed · +22 lines 51490d5c0d9e
- 1mo ago Changed · -10 lines 603a404db71f
- 1mo ago First seen · 124 lines scan A 644dd367be9e
PreToolUse is a hook published in the GitHub repository christopherlouet/claude-base (5 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 2026-09-03.
Other hooks, from other repositories
PreToolUse
Runs before the agent uses a tool for Bash tool calls, running an inline shell check. From ApexIQ/skillsmith.
SessionStart
Runs when a session starts on startup, executing install_pkgs.sh. From supabase/supabase.
PostToolUse
Runs after a tool call finishes for Write and Edit tool calls, executing format_and_lint.sh. From supabase/supabase.
SessionStart
Runs when a session starts, executing on-start.js via node. From google-gemini/gemini-cli.
PreToolUse
Runs before the agent uses a tool for Bash tool calls, running an inline shell check. From apache/superset.
PreToolUse
Runs before the agent uses a tool, executing pre-write.sh and pre-bash.sh (2 commands). From anthropics/claude-cookbooks.