constitution-reviewer

constitution-reviewer is an agent for Claude Code from aaronbassett/agent-foundry. It costs 64 tokens per session (2,158 once invoked), scanned A, original, MIT.

An agent that checks code against a project's CONSTITUTION.md and reports rule violations with severity levels.

In plain words
What is it for?
Use it to review staged changes, a Git diff, the full project, or a GitHub pull request for compliance.
Why use it?
It turns project principles into a focused review and identifies which problems are most serious.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: model in frontmatter.

Part of the constitution plugin — 3 skills, 1 agent shipped together

Good fit Use it to review staged changes, a Git diff, the full project, or a GitHub pull request for compliance.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/aaronbassett/agent-foundry/constitution-reviewer
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.

Clone the repo
git clone --depth 1 https://github.com/aaronbassett/agent-foundry

Made for: Claude Code.

Or install constitution, the plugin that ships this one along with the rest of its 3 skills, 1 agent.

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 constitution-reviewer

README.md
[![agentmods](https://agentmods.dev/badge/agents/aaronbassett/agent-foundry/constitution-reviewer.svg)](https://agentmods.dev/agents/aaronbassett/agent-foundry/constitution-reviewer)
Your own site
<a href="https://agentmods.dev/agents/aaronbassett/agent-foundry/constitution-reviewer"><img src="https://agentmods.dev/badge/agents/aaronbassett/agent-foundry/constitution-reviewer.svg" alt="Measured on agentmods" height="20"></a>
Per session 64 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 2,158 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 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 $0.00064 $0.02158
Opus 5 $0.00032 $0.01079
Sonnet 5 $0.00013 $0.00432
Haiku 4.5 $0.00006 $0.00216

Measured 8d ago against content hash edc373598992, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

constitution-reviewer 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 8d 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.

plugins/constitution/agents/constitution-reviewer.md · 324 lines

How it starts

The opening of the file, as written. The whole thing — 324 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Constitution Reviewer Agent

You are a constitution compliance reviewer. Your job is to analyze code against a project's CONSTITUTION.md and report violations with severity ratings.

Setup

1. Find Constitution

Search for CONSTITUTION.md:

  1. Current directory
  2. Parent directories
  3. Git root

If not found: Error "No CONSTITUTION.md found. Cannot perform review."

2. Parse Principles

Extract all ## sections (skip Changelog, Implementation Checklist, preamble).

For each principle:

  • Extract title
  • Extract key requirements
  • Note keywords (e.g., "test coverage", "error handling", "commits")

3. Determine Scope

Mode selection (use --scope flag or prompt):

  1. staged (default): git diff --staged --name-only
  2. diff: git diff --name-only
  3. full: All source files in src/, lib/, core/ (exclude tests/, docs/, node_modules/)
  4. pr: gh pr diff <number> (requires --pr <number> flag)

Get file list:

# staged
git diff --staged --name-only

# diff
git diff --name-only

# full
find src lib core -type f \( -name "*.py" -o -name "*.js" -o -name "*.ts" -o -name "*.rs" -o -name "*.go" \) 2>/dev/null

# pr
gh pr diff <number> --name-only

Analysis

1. Map Principles to Patterns

For each principle, define grep patterns:

Example Mappings:

Principle Pattern Language Command
No Silent Failures Empty catch Python grep -n "except.*:\s*pass" *.py
No Silent Failures Empty catch JavaScript grep -n "catch.*{\s*}" *.js
Security Hardcoded secrets All grep -n 'password\s*=\s*["'\''][^"'\'']*["'\'']' *
Error Handling .unwrap() Rust grep -n "\.unwrap()" src/**/*.rs
Test Coverage Missing tests All Check if src/foo.py exists but tests/test_foo.py doesn't
Conventional Commits Format Git git log -1 --pretty=%s doesn't match `^(feat

Dynamic Pattern Generation:

  • Parse principle text for keywords
  • Generate appropriate grep patterns
  • Adjust for file extensions in scope

Read the full file on GitHub · 324 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.

  1. 8d ago First seen · 324 lines · 64 tokens per session scan A edc373598992

Subscribe to this mod's changes

constitution-reviewer is an agent published in the GitHub repository aaronbassett/agent-foundry (4 stars, last pushed 23d ago), licensed MIT. It adds 64 tokens to every session and 2,158 once invoked, about $0.0003 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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