plan-checker

A checker for software implementation plans before coding begins. It examines whether the plan covers the requirements, names valid file paths, follows dependencies, and fits the project.

In plain words
What is it for?
It is for reviewing plans for new features, migrations, or other code changes before someone executes them.
Why use it?
It catches incomplete plans, wrong paths, missing steps, and ordering problems before they waste implementation time.

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/random6913/claude-code-superkit/plan-checker
Any agent
npx skills add RaNDoM6913/claude-code-superkit --skill plan-checker
Clone the repo
git clone --depth 1 https://github.com/RaNDoM6913/claude-code-superkit

Made for: Claude Code, Codex.

Per session 24 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 713 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 $0.00024 $0.00713
Opus 5 $0.00012 $0.00357
Sonnet 5 $0.00005 $0.00143
Haiku 4.5 $0.00002 $0.00071

Measured yesterday against content hash 650e5698fddd, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

plan-checker 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 yesterday.

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.

packages/codex/skills/plan-checker/SKILL.md · 98 lines

How it starts

The opening of the file, as written. The whole thing — 98 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Plan Checker

Validates implementation plans BEFORE execution begins. Catches incomplete, incorrect, or infeasible plans early — when fixing is cheap.

Phase 0: Load Project Context

Read if exists:

  1. AGENTS.md or CLAUDE.md — project conventions, file structure, tech stack
  2. docs/architecture/ — existing architecture (verify plan references match reality)

Use this context to:

  • Verify file paths in plan actually exist (or parent dirs exist for new files)
  • Check that plan follows project conventions
  • Validate migration numbering against existing migrations

When to Use

  • BEFORE Phase 3 (Implement) in dev-orchestrator — mandatory gate
  • After writing any implementation plan
  • Dispatched automatically by dev-orchestrator

Validation Dimensions (8 checks)

1. Requirement Coverage (CRITICAL)

  • Every stated goal has at least 1 task addressing it
  • No requirements mentioned in description but missing from tasks

2. File Path Accuracy (CRITICAL)

  • Every "Modify: path" → verify file exists
  • Every "Create: path" → verify parent directory exists
  • Flag wrong paths before execution wastes time

3. Dependency Order (HIGH)

  • Migrations before code that uses new tables
  • Interfaces before implementations
  • API changes before consumers

4. Scope Sanity (HIGH)

  • More than 15 tasks → suggest splitting
  • More than 20 files → suggest phasing
  • Tasks too vague ("update frontend") → request specifics

5. Convention Compliance (MEDIUM)

  • Migration naming matches project pattern
  • Files in correct layer directories
  • Commit messages follow conventional format

6. Documentation Completeness (MEDIUM)

  • API changed → doc update task exists?
  • Migration added → AGENTS.md/project docs counter update?
  • File structure changed → tree update?

7. Test Coverage (MEDIUM)

  • New endpoints → test tasks?
  • Business logic → service tests?
  • Bug fixes → regression tests?

8. Factual Accuracy (CRITICAL)

  • Claims about existing code → verify by reading actual files
  • "Currently X does Y" → grep to confirm
  • Number claims (endpoint count, migration count) → verify
  • Most important check — catches assumptions that become bugs

Read the full file on GitHub · 98 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. yesterday First seen · 98 lines · 24 tokens per session scan A 650e5698fddd

Subscribe to this mod's changes

plan-checker is a skill published in the GitHub repository RaNDoM6913/claude-code-superkit (2 stars, last pushed 1mo ago), licensed MIT. It adds 24 tokens to every session and 713 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 2026-08-31.

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