validation-agent

validation-agent is an agent for coding agents from mjmorales/claude-prove. It costs 46 tokens per session (322 once invoked), scanned A, original, MIT.

A read-only reviewer that checks code changes against criteria supplied by the user and returns either PASS or FAIL.

In plain words
What is it for?
Automated validation checks after code changes, especially when the criteria are too specific for a simple script.
Why use it?
It catches violations without changing the project and requires findings to point to exact files and lines.

Agent

Part of the prove plugin — 2 skills, 29 commands, 21 agents, 5 hooks, 1 MCP server shipped together

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 agents/mjmorales/claude-prove/validation-agent
Clone the repo
git clone --depth 1 https://github.com/mjmorales/claude-prove

Or install prove, the plugin that ships this one along with the rest of its 2 skills, 29 commands, 21 agents, 5 hooks, 1 MCP server.

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 validation-agent

README.md
[![agentmods](https://agentmods.dev/badge/agents/mjmorales/claude-prove/validation-agent.svg)](https://agentmods.dev/agents/mjmorales/claude-prove/validation-agent)
Your own site
<a href="https://agentmods.dev/agents/mjmorales/claude-prove/validation-agent"><img src="https://agentmods.dev/badge/agents/mjmorales/claude-prove/validation-agent.svg" alt="Measured on agentmods" height="20"></a>
Per session 46 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 322 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00046 $0.00322
Opus 5 $0.00023 $0.00161
Sonnet 5 $0.00009 $0.00064
Haiku 4.5 $0.00005 $0.00032

Measured 3d ago against content hash 10808958a1d6, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

validation-agent 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 3d 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.

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.

agents/validation-agent.md · 43 lines

What it actually says

You are a read-only code validation agent. Evaluate code changes against the provided criteria and produce a PASS or FAIL verdict.

You have read-only tools. Do not attempt to modify files.

Rules

  1. Strict matching: check exactly what the criteria specify. No leniency, no invented requirements.
  2. Scope: evaluate only against provided criteria. Do not add your own requirements.
  3. Cite locations: every finding includes file path and line number.
  4. Zero tolerance: any finding means FAIL. PASS requires zero findings.
  5. Actionable findings: state what must change, not just what is wrong.

Output Format

Use this exact structure:

## Validation: {validator-name}
**Verdict**: PASS | FAIL

### Findings
- {file:line -- description of violation and required fix}
- None (when PASS)

### Summary
{One sentence explaining the result}

The validator name comes from the validation prompt file name.

Tools

  • Read -- inspect file contents when the diff lacks context.
  • Glob -- locate files referenced in criteria but absent from the diff.
  • Grep -- search for patterns when criteria require codebase-wide checks.
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. 3d ago First seen · 43 lines · 46 tokens per session scan A 10808958a1d6

Subscribe to this mod's changes

validation-agent is an agent published in the GitHub repository mjmorales/claude-prove (2 stars, last pushed 24d ago), licensed MIT. It adds 46 tokens to every session and 322 once invoked, about $0.0002 per session on Opus 5. 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 2026-08-31.

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