Why does fact-forcing work better than self-evaluation?

LLM self-evaluation questions like 'are you sure?' almost always return a false positive. By requiring the model to query file imports and schema definitions with search tools, it brings critical context directly into the prompt before generating code.

What is GateGuard and how does it work?

GateGuard is a PreToolUse hook for Claude Code that blocks the initial execution of Edit, Write, or destructive Bash operations. It forces Claude to gather concrete facts—such as importing files, public interfaces, and data schemas—before allowing the action to proceed on retry.

How can I exempt specific paths like tests or generated files?

You can configure the GATEGUARD_EXEMPT_GLOBS environment variable with comma-separated globs (such as **/tests/** or **/dist/**) to bypass first-touch fact forcing for low-risk directories.

Does GateGuard slow down every single Bash command?

No. Routine non-destructive commands are only gated once per session. Full fact-forcing triggers on the first edit per file and strictly on destructive shell commands like rm -rf, git reset --hard, or drop table.

GateGuard - Pre-Action Gate Claude Code Skill

GateGuard is a pre-tool-use hook that intercepts Edit, Write, and Bash operations in Claude Code, requiring concrete factual investigation into dependent modules, data schemas, and user instructions before permitting modifications. Rather than relying on ineffective LLM self-evaluation, GateGuard utilizes a three-stage deny-force-allow pattern to ensure context is actively gathered through tree searches and file inspections. This fact-forcing mechanism eliminates unverified assumptions, guards against destructive CLI operations with rollback mandates, and measurably improves code design depth across complex codebases.

主な機能

01Three-stage deny-force-allow gating pattern for first-touch edits and file creations

02Pre-action fact verification forcing cross-module dependency and schema discovery

03Destructive Bash command protection requiring explicit rollback plans

04Context-saving condensed denials to avoid bloating session context windows

05Flexible configuration via glob exemptions and granular environment toggles

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ユースケース

01Refactoring complex, interconnected codebases where edits risk breaking cross-module dependencies

02Preventing accidental destructive terminal actions such as hard resets, force pushes, or recursive file deletions

03Working with strict data structures and date formats where unverified assumptions cause silent bugs

Tieline — product intent grounded in code

GateGuard Pre-Action Gate

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