prove_it: Skill for Claude Code

.claude/skills/test-local/SKILL.md

test-local is a skill for Claude Code from searlsco/prove_it. It costs 33 tokens per session (556 once invoked), scanned D, original, MIT.

A local testing skill for running prove_it directly from its source code against an example project or temporary folder. It checks how the tool behaves when it receives events such as starting a session, editing a file, or attempting a commit.

In plain words
What is it for?
Use it to test SessionStart, Stop, file-edit protection, commit checks, and initial setup locally. If no target is given, it uses the basic example project.
Why use it?
It lets you verify hook behaviour before relying on a packaged or Homebrew-installed version. This can reveal whether protections and setup actions work as expected in a controlled project.

Skill for Claude Code

Written for Claude Code: SessionStart hook event.

This is searlsco/prove_it's own configuration. It tells Claude Code how to work on prove_it itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything prove_it configures →

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/skills/test-local/SKILL.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.

agentmods badge for test-local

README.md
[![agentmods](https://agentmods.dev/badge/skills/searlsco/prove_it/test-local.svg)](https://agentmods.dev/skills/searlsco/prove_it/test-local)
Your own site
<a href="https://agentmods.dev/skills/searlsco/prove_it/test-local"><img src="https://agentmods.dev/badge/skills/searlsco/prove_it/test-local.svg" alt="Measured on agentmods" height="20"></a>
Per session 33 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 556 The whole file, excluding the scripts and references it only reads on demand.
Security scan D 2 findings. 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00033 $0.00556
Opus 5 $0.00016 $0.00278
Sonnet 5 $0.00007 $0.00111
Haiku 4.5 $0.00003 $0.00056

Measured 7d ago against content hash 12fdfe246671, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade D, and why

test-local scanned grade D with 2 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 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.

cat .claude/prove_it/config.json

Recursive force deletehighDestructive command

rm -rf with a variable or a broad path is one typo away from removing the wrong tree.

rm -rf "$tmpdir"
.claude/skills/test-local/SKILL.md · 66 lines

What it actually says

Test prove_it locally

Run prove_it from the repo source (not the Homebrew install) to test hook behavior.

Steps

  1. Identify the test target. If the user didn't specify, use example/basic/.

  2. Set up the PATH shim so prove_it resolves to the repo's cli.js:

    export PATH="$(git rev-parse --show-toplevel)/test/bin:$PATH"
    which prove_it   # should show test/bin/prove_it
    
  3. Run the requested test. Common scenarios:

    Test a specific hook event:

    cd example/basic
    echo '{"hook_event_name":"Stop","session_id":"test","cwd":"."}' | prove_it hook claude:Stop
    

    Test SessionStart:

    echo '{"hook_event_name":"SessionStart","source":"startup","session_id":"test","cwd":"."}' | prove_it hook claude:SessionStart
    

    Test PreToolUse (edit protection):

    echo '{"hook_event_name":"PreToolUse","tool_name":"Edit","tool_input":{"file_path":"src/greet.js"},"session_id":"test","cwd":"."}' | prove_it hook claude:PreToolUse
    

    Test PreToolUse (commit gate):

    echo '{"hook_event_name":"PreToolUse","tool_name":"Bash","tool_input":{"command":"git commit -m test"},"session_id":"test","cwd":"."}' | prove_it hook claude:PreToolUse
    

    Test init in a temp directory:

    tmpdir=$(mktemp -d)
    cd "$tmpdir" && git init
    prove_it init --no-default-checks
    cat .claude/prove_it/config.json
    prove_it deinit
    rm -rf "$tmpdir"
    

    Test doctor:

    cd example/basic
    prove_it doctor
    
  4. Report the output and whether the behavior matches expectations.

Notes

  • The shim at test/bin/prove_it just does exec node ../../cli.js "$@"
  • All $(prove_it prefix)/libexec/* commands in configs will also resolve through the shim
  • This tracks with the current git ref—check out any commit to test that version
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. 7d ago First seen · 66 lines · 33 tokens per session scan D 12fdfe246671

Subscribe to this mod's changes

test-local is a skill published in the GitHub repository searlsco/prove_it (199 stars, last pushed 4mo ago), licensed MIT. It adds 33 tokens to every session and 556 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it D with 2 findings (reads agent configuration directories, recursive force delete). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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