writing-verification-plans

writing-verification-plans is a skill for Claude Code from britt/agent-skills. It costs 55 tokens per session (923 once invoked), scanned A, original, MIT.

A skill for writing verification plans that test a feature through real, running systems rather than mocks or fakes. The plans contain acceptance scenarios, observable success criteria, and a pass/fail record.

In plain words
What is it for?
Use it when setting up a project, adding a feature that needs real-world validation, or creating procedures for checking that integrations and user-facing behaviour work correctly.
Why use it?
It defines how to prove that a feature works end to end in realistic conditions, especially when a project has no verification plan.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: mentions CLAUDE.md.

Part of the agent-skills plugin — 28 skills shipped together

Good fit Use it when setting up a project, adding a feature that needs real-world validation, or creating procedures for checking that integrations and user-facing behaviour work correctly.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/britt/agent-skills/writing-verification-plans
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.

Any agent
npx skills add britt/agent-skills --skill writing-verification-plans
Clone the repo
git clone --depth 1 https://github.com/britt/agent-skills

Made for: Claude Code.

Or install agent-skills, the plugin that ships this one along with the rest of its 28 skills.

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 writing-verification-plans

README.md
[![agentmods](https://agentmods.dev/badge/skills/britt/agent-skills/writing-verification-plans/github.svg)](https://agentmods.dev/skills/britt/agent-skills/writing-verification-plans)
Your own site
<a href="https://agentmods.dev/skills/britt/agent-skills/writing-verification-plans"><img src="https://agentmods.dev/badge/skills/britt/agent-skills/writing-verification-plans/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for writing-verification-plans

Your own site · 80×15
<a href="https://agentmods.dev/skills/britt/agent-skills/writing-verification-plans"><img src="https://agentmods.dev/badge/skills/britt/agent-skills/writing-verification-plans.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 55 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 923 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 $0.00055 $0.00923
Opus 5 $0.00028 $0.00462
Sonnet 5 $0.00011 $0.00185
Haiku 4.5 $0.00006 $0.00092

Measured 10d ago against content hash 0366a7028c15, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

writing-verification-plans 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 10d 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/writing-verification-plans/SKILL.md · 134 lines

How it starts

The opening of the file, as written. The whole thing — 134 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Writing Verification Plans

Overview

Help Claude write verification plans that validate a project works in real-world scenarios before completing tasks.

Core principle: Verification is not integration testing. It uses real systems, never mocks or fakes. A test environment is acceptable only if it's a fully running copy of the system being integrated with.

Announce at start: "I'm using the writing-verification-plans skill to create acceptance testing procedures."

When to Use This Skill

Use this skill when:

  • Setting up a new project (called from setting-up-a-project skill)
  • A project lacks a VERIFICATION_PLAN.md
  • The developer asks for a verification plan
  • Adding new features that require real-world validation

When NOT to use: Not for writing automated test suites — this skill produces manual/agent-executed acceptance procedures, not unit or integration tests.

Writing the Verification Plan

Ask the user about the real-world scenarios that need to be validated. For each scenario, gather:

  1. What is being tested? The feature or capability to verify
  2. What does success look like? Concrete, observable outcomes
  3. What environment is needed? Real systems, test accounts, sample data
  4. What could go wrong? Edge cases and failure modes to check

VERIFICATION_PLAN.md Format

# Verification Plan

**Verification runs automatically after completing any task. Do not wait for the developer to request it.**

## Prerequisites

[List everything needed before verification can run]
- Test environment setup instructions
- Required accounts or credentials
- Sample data or test fixtures
- External systems that must be running

## Scenarios

### Scenario 1: [Name]

**Context**: [What state the system should be in before starting]

**Steps**:
1. [Specific action Claude should take]
2. [Next action]
3. [Continue until complete]

**Success Criteria**:
- [ ] [Observable outcome that must be true]
- [ ] [Another required outcome]

**If Blocked**: [When to stop and ask developer for help]

[Add a section like Scenario 1 for each additional scenario]

## Verification Rules

- Never use mocks or fakes
- Test environments must be fully running copies of real systems
- If any success criterion fails, verification fails
- Ask developer for help if blocked, don't guess

Read the full file on GitHub · 134 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. 10d ago First seen · 134 lines · 55 tokens per session scan A 0366a7028c15

Subscribe to this mod's changes

writing-verification-plans is a skill published in the GitHub repository britt/agent-skills (5 stars, last pushed 7d ago), licensed MIT. It adds 55 tokens to every session and 923 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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