validate_plan

validate_plan is a skill for Claude Code from hoblin/claude-ruby-marketplace. It costs 11 tokens per session (1,122 once invoked), scanned A, original, MIT.

A procedure for checking whether an implementation matches its technical plan. It gathers the plan, expected changes, success conditions, Git history, code differences, and test results.

In plain words
What is it for?
Use it after implementing a planned change to inspect the code, review commits and differences, and run the project's checks and tests.
Why use it?
It helps find missing work, unintended changes, and unmet requirements before an implementation is considered complete.

Skill for Claude Code

Written for Claude Code: argument-hint in frontmatter.

Part of the rpi plugin — 13 skills, 12 agents shipped together

Good fit Use it after implementing a planned change to inspect the code, review commits and differences, and run the project's checks and tests.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/hoblin/claude-ruby-marketplace/validate_plan
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 hoblin/claude-ruby-marketplace --skill validate_plan
Clone the repo
git clone --depth 1 https://github.com/hoblin/claude-ruby-marketplace

Made for: Claude Code.

Or install rpi, the plugin that ships this one along with the rest of its 13 skills, 12 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 validate_plan

README.md
[![agentmods](https://agentmods.dev/badge/skills/hoblin/claude-ruby-marketplace/validate_plan/github.svg)](https://agentmods.dev/skills/hoblin/claude-ruby-marketplace/validate_plan)
Your own site
<a href="https://agentmods.dev/skills/hoblin/claude-ruby-marketplace/validate_plan"><img src="https://agentmods.dev/badge/skills/hoblin/claude-ruby-marketplace/validate_plan/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 validate_plan

Your own site · 80×15
<a href="https://agentmods.dev/skills/hoblin/claude-ruby-marketplace/validate_plan"><img src="https://agentmods.dev/badge/skills/hoblin/claude-ruby-marketplace/validate_plan.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 11 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,122 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 $0.00011 $0.01122
Opus 5 $0.00005 $0.00561
Sonnet 5 $0.00002 $0.00224
Haiku 4.5 $0.00001 $0.00112

Measured 3d ago against content hash d32f1f818fc0, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

validate_plan 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.

plugins/rpi/skills/validate_plan/SKILL.md · 167 lines

How it starts

The opening of the file, as written. The whole thing — 167 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Validate Plan

You are tasked with validating that an implementation plan was correctly executed, verifying all success criteria and identifying any deviations or issues.

Initial Setup

When invoked:

  1. Determine context - Are you in an existing conversation or starting fresh?

    • If existing: Review what was implemented in this session
    • If fresh: Need to discover what was done through git and codebase analysis
  2. Locate the plan:

    • If plan path provided, use it
    • Otherwise, search recent commits for plan references or ask user
  3. Gather implementation evidence:

    # Check recent commits
    git log --oneline -n 20
    git diff HEAD~N..HEAD  # Where N covers implementation commits
    
    # Run comprehensive checks
    cd $(git rev-parse --show-toplevel) && make check test
    

Validation Process

Step 1: Context Discovery

If starting fresh or need more context:

  1. Read the implementation plan completely

  2. Identify what should have changed:

    • List all files that should be modified
    • Note all success criteria (automated and manual)
    • Identify key functionality to verify
  3. Spawn parallel research tasks to discover implementation:

    Task 1 - Verify database changes:
    Research if migration [N] was added and schema changes match plan.
    Check: migration files, schema version, table structure
    Return: What was implemented vs what plan specified
    
    Task 2 - Verify code changes:
    Find all modified files related to [feature].
    Compare actual changes to plan specifications.
    Return: File-by-file comparison of planned vs actual
    
    Task 3 - Verify test coverage:
    Check if tests were added/modified as specified.
    Run test commands and capture results.
    Return: Test status and any missing coverage
    

Step 2: Systematic Validation

For each phase in the plan:

  1. Check completion status:
    • Look for checkmarks in the plan (- [x])
    • Verify the actual code matches claimed completion

Read the full file on GitHub · 167 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. 3d ago First seen · 167 lines · 11 tokens per session scan A d32f1f818fc0

Subscribe to this mod's changes

validate_plan is a skill published in the GitHub repository hoblin/claude-ruby-marketplace (37 stars, last pushed 3d ago), licensed MIT. It adds 11 tokens to every session and 1,122 once invoked, about $0.0001 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 2026-09-07.

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