verify

verify is a skill for Claude Code, Codex from blake-simpson/belmont. It costs 10 tokens per session (10,837 once invoked), scanned A, original, Apache-2.0.

A verification workflow that reviews completed Belmont tasks against their requirements and code-quality expectations. Belmont is a project-planning system that stores feature plans and progress in files.

In plain words
What is it for?
Use it to verify completed tasks for a selected feature and run code review across its Belmont planning and progress records.
Why use it?
It provides a structured review after implementation instead of relying only on the implementer’s report. It can identify unfinished requirements or problems in completed work.

Skill for Claude CodeCodex

Part of the belmont plugin — 17 skills, 6 agents 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 skills/blake-simpson/belmont/verify
Any agent
npx skills add blake-simpson/belmont --skill verify
Clone the repo
git clone --depth 1 https://github.com/blake-simpson/belmont

Made for: Claude Code, Codex.

Or install belmont, the plugin that ships this one along with the rest of its 17 skills, 6 agents.

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 verify

README.md
[![agentmods](https://agentmods.dev/badge/skills/blake-simpson/belmont/verify.svg)](https://agentmods.dev/skills/blake-simpson/belmont/verify)
Your own site
<a href="https://agentmods.dev/skills/blake-simpson/belmont/verify"><img src="https://agentmods.dev/badge/skills/blake-simpson/belmont/verify.svg" alt="Measured on agentmods" height="20"></a>
Per session 10 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 10,837 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. 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 $0.00010 $0.10837
Opus 5 $0.00005 $0.05418
Sonnet 5 $0.00002 $0.02167
Haiku 4.5 $0.00001 $0.01084

Measured 4d ago against content hash 065e086f20d5, 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 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 4d 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

1. **Never curl, probe, or assume `localhost:3000`** (or any other well-known default) is "yours". A port that's already bound from outside your worktree belongs to someone else — another worktree, the user's own dev ses
plugin/skills/verify/SKILL.md · 582 lines

How it starts

The opening of the file, as written. The whole thing — 582 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Belmont: Verify

You are the verification orchestrator. Your job is to run comprehensive verification and code review on all completed tasks, checking that implementations meet requirements and code quality standards.

Feature Selection

Belmont organizes work into features — each feature gets its own directory under .belmont/features/<slug>/ with its own PRD, PROGRESS, TECH_PLAN, and MILESTONE files.

Select the Active Feature

  1. List all feature directories under .belmont/features/
  2. If features exist: read each feature's PRD.md for its name and status, then Ask which feature to verify, or auto-select the one with completed tasks
  3. If no features exist: tell the user to run /belmont:product-plan to create their first feature, then stop
  4. Set the base path to .belmont/features/<selected-slug>/

Base Path Convention

Once the base path is resolved, use {base} as shorthand:

  • {base}/PRD.md — the feature PRD
  • {base}/PROGRESS.md — the feature progress tracker
  • {base}/TECH_PLAN.md — the feature tech plan
  • {base}/MILESTONE.md — the active milestone file
  • {base}/MILESTONE-*.done.md — archived milestones
  • {base}/NOTES.md — learnings and discoveries from previous sessions

Master files (always at .belmont/ root):

  • .belmont/PR_FAQ.md — strategic PR/FAQ document
  • .belmont/PRD.md — master PRD (feature catalog)
  • .belmont/PROGRESS.md — master progress tracking (feature summary table)
  • .belmont/TECH_PLAN.md — master tech plan (cross-cutting architecture)

Worktree Environment

If the environment variable BELMONT_WORKTREE is set to 1, you are running in an isolated git worktree for parallel execution. Several sibling worktrees may be running the same project concurrently on different ports. Ignoring the port rules below will cause silent merge conflicts, verification flakes, and processes killing each other — treat this section as load-bearing.

Port variables set for you

Belmont populates these before your process starts. Use them directly; do not guess at port numbers, and do not copy ports out of package.json or config files.

Read the full file on GitHub · 582 lines

Files

What ships with it

2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 4d ago First seen · 582 lines · 10 tokens per session scan A 065e086f20d5

Subscribe to this mod's changes

verify is a skill published in the GitHub repository blake-simpson/belmont (4 stars, last pushed 16d ago), licensed Apache-2.0. It adds 10 tokens to every session and 10,837 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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