verify

A verification procedure that uses three independent reviewers: one looks for problems, one challenges those findings, and one decides what holds up. It is intended for checking important code changes.

In plain words
What is it for?
Use it to review authentication, permissions, migrations, financial calculations, breaking API changes, or other high-risk work.
Why use it?
It helps catch missed bugs and weak conclusions before or after changes involving security, data, money, or public interfaces.

Skill for Claude CodeCodex

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 skills/darkroomengineering/cc-settings/verify
Any agent
npx skills add darkroomengineering/cc-settings --skill verify
Clone the repo
git clone --depth 1 https://github.com/darkroomengineering/cc-settings

Made for: Claude Code, Codex.

Per session 46 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,690 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 $0.01690
Opus 5 $0.00023 $0.00845
Sonnet 5 $0.00009 $0.00338
Haiku 4.5 $0.00005 $0.00169

Measured 2d ago against content hash 8daaedd6c3ba, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

verify 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 2d 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.

skills/verify/SKILL.md · 192 lines

How it starts

The opening of the file, as written. The whole thing — 192 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Adversarial Verification

Three agents with competing incentives: one finds issues, one disproves them, one judges.

Standalone Codex

Skip the Claude marker below. Create each fresh panelist with spawn_agent, deliver context while it runs with send_message, trigger another turn once it is idle with followup_task, wait with wait_agent, and stop its current turn with interrupt_agent only when necessary. Never spawn codex-verifier and never run codex-run.ts from inside Codex.

Only read-only reviewers may overlap. Writers share the working tree unless the live host explicitly offers isolation, so any implementer and test-writer follow-up must use non-overlapping ownership and run serially.

Claude-only marker: standalone Codex must skip this command. mkdir -p ~/.claude/tmp && echo "verify" > ~/.claude/tmp/heavy-skill-active && date -u +"%Y-%m-%dT%H:%M:%SZ" >> ~/.claude/tmp/heavy-skill-active

When to Use

  • Security-sensitive code (auth, crypto, permissions)
  • Data integrity (migrations, schema changes, ETL)
  • Financial logic (payments, billing, calculations)
  • Breaking changes (API contracts, public interfaces)

The Three-Agent Pattern

Agent 1: Finder

Agent(reviewer, "You are a bug finder. Analyze the following code/changes thoroughly.
Score yourself: +1 for low-impact issues, +5 for medium-impact, +10 for critical.
Report every potential issue you find — edge cases, race conditions, missing validation,
security holes, logic errors, performance problems.
Report your total score at the end.

Target: [describe what to verify]
Files: [list files]")

Finder over-reports by design — this is the superset of all possible issues.

Standalone Codex panel

Use three separate native agents instead of the Claude bridge: spawn a fresh issue-finder, wait until it finishes, pass its report to a separate disprover, then wait until that agent finishes before spawning the judge with both reports. Follow the lifecycle above for each role. Skip the Claude cross-model finder below.

Read the full file on GitHub · 192 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. 2d ago First seen · 192 lines · 46 tokens per session scan A 8daaedd6c3ba

Subscribe to this mod's changes

verify is a skill published in the GitHub repository darkroomengineering/cc-settings (42 stars, last pushed 4d ago), licensed MIT. It adds 46 tokens to every session and 1,690 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 2026-08-30.

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