What is prove_it CLAUDE.md?

A development guide for prove_it, a configuration-based framework that runs checks when Claude Code or Git reaches events such as starting a session, using a tool, stopping, committing, or pushing.

Use it when developing, reviewing, or testing prove_it commands, dispatchers, checks, configuration, lifecycle hooks, or Git hooks.

It explains the framework’s architecture and the roles of its main files, so changes can be made in the correct place. It also documents how Claude Code hooks and tests fit together.

How searlsco/prove_it configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to searlsco/prove_it. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/searlsco/prove_it/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/searlsco/prove_it

Made for: Claude Code.

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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/searlsco/prove_it/claude-md.svg)](https://agentmods.dev/instructions/searlsco/prove_it/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/searlsco/prove_it/claude-md"><img src="https://agentmods.dev/badge/instructions/searlsco/prove_it/claude-md.svg" alt="Measured on agentmods" height="20"></a>

Per session 1,381 This file is loaded in full into every session.

When invoked 1,381 The same file — it is already loaded in full.

Security scan B 1 finding. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.01381	$0.01381
Opus 5	$0.00691	$0.00691
Sonnet 5	$0.00276	$0.00276
Haiku 4.5	$0.00138	$0.00138

Measured 7d ago against content hash ccd5c6af6ab8, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade B, and why

prove_it CLAUDE.md scanned grade B with 1 finding 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 7d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Reads agent configuration directoriesmediumAgent snooping

.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.

- **`install`/`uninstall`** manage global hook registrations in `~/.claude/settings.json`

CLAUDE.md · 107 lines

How it starts

The opening of the file, as written. The whole thing — 107 lines — stays where its author put it; the contents beside it link to each section on GitHub.

prove_it Development Guide

Architecture

prove_it is a config-driven hook framework for Claude Code. It reads .claude/prove_it/config.json from a project directory and runs matching tasks when Claude Code fires lifecycle events (SessionStart, PreToolUse, Stop). It also dispatches git hooks (pre-commit, pre-push).

Key modules

cli.js—CLI entry point, commands: install, uninstall, init, deinit, doctor, monitor, hook, prefix
lib/dispatcher/claude.js—Main dispatcher for Claude Code events
lib/dispatcher/git.js—Dispatcher for git hooks
lib/dispatcher/protocol.js—Output formatting for Claude Code hook API
lib/checks/script.js—Runs shell commands as tasks
lib/checks/agent.js—Runs AI agent reviewer tasks
lib/checks/env.js—Runs env tasks that inject environment variables via CLAUDE_ENV_FILE
libexec/guard-config—Standalone script: blocks edits to prove_it config files
libexec/briefing—Standalone script: renders session orientation on SessionStart
lib/defaults.js—Single source of truth for config defaults (CONFIG_DEFAULTS, DEFAULT_MODELS, DEFAULT_ALLOWED_TOOLS)
lib/config.js—Config loading, merging, and buildConfig() for init
lib/init.js—Project initialization, git hook shim management
lib/template.js—Template variable expansion for agent prompts
lib/globs.js—File matching, source detection, config path detection
lib/monitor.js—prove_it monitor CLI: tails session logs in human-readable format

Claude Code Hook API

PreToolUse: permissionDecision valid values are "allow", "deny", "ask" (inside hookSpecificOutput). Never use "block" or "approve"—Claude Code silently ignores them.
Stop: uses top-level decision: "block" or "approve" (different schema from PreToolUse).
SessionStart: outputs JSON with additionalContext and optionally systemMessage.
session_id is available in hook input for all events.

Testing

./script/test          # lint + unit tests + integration tests (the verification oracle)
./script/test_fast     # lint + unit tests only (runs on Stop hook)
npm run test:integration  # integration tests

Read the full file on GitHub · 107 lines

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.

7d ago First seen · 107 lines · 1,381 tokens per session scan B ccd5c6af6ab8

Subscribe to this mod's changes

prove_it CLAUDE.md is an instructions file published in the GitHub repository searlsco/prove_it (199 stars, last pushed 4mo ago), licensed MIT. It adds 1,381 tokens to every session, about $0.0069 per session on Opus 5. A static security scan graded it B with 1 finding (reads agent configuration directories). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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