plan

plan is a skill for Claude Code, Codex from owainlewis/youtube-tutorials. It costs 48 tokens per session (915 once invoked), scanned A, original, MIT.

A guide for turning a software task into a clear implementation plan before coding. It supports both short plans and longer plans that can guide work across several stages.

In plain words
What is it for?
Use it to plan a new feature, break down a ticket, define success criteria, or keep a multi-step coding task organized.
Why use it?
It helps clarify the work, boundaries, and checks needed when a request is vague or affects multiple files, interfaces, settings, or data structures.

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/owainlewis/youtube-tutorials/plan-skill
Any agent
npx skills add owainlewis/youtube-tutorials --skill plan-skill
Clone the repo
git clone --depth 1 https://github.com/owainlewis/youtube-tutorials

Made for: Claude Code, Codex.

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 plan

README.md
[![agentmods](https://agentmods.dev/badge/skills/owainlewis/youtube-tutorials/plan-skill.svg)](https://agentmods.dev/skills/owainlewis/youtube-tutorials/plan-skill)
Your own site
<a href="https://agentmods.dev/skills/owainlewis/youtube-tutorials/plan-skill"><img src="https://agentmods.dev/badge/skills/owainlewis/youtube-tutorials/plan-skill.svg" alt="Measured on agentmods" height="20"></a>
Per session 48 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 915 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 $0.00048 $0.00915
Opus 5 $0.00024 $0.00458
Sonnet 5 $0.00010 $0.00183
Haiku 4.5 $0.00005 $0.00092

Measured 4d ago against content hash bf34f926df02, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

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 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.

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.

tutorials/codex-for-developers/resources/04-skills/plan-skill/SKILL.md · 147 lines

How it starts

The opening of the file, as written. The whole thing — 147 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Plan

Purpose

Turn a ticket, feature request, or rough idea into a plan that is clear enough to implement against.

For smaller work, that means a short working plan.

For larger multi-hour work, that means a longer living execution plan in the style of PLANS.md.

When to use

  • Starting a new feature or meaningful change
  • A Linear ticket is good, but still needs cleaner implementation intent
  • Requirements, scope, or success criteria are unclear
  • The change touches multiple files, interfaces, config, schema, or data flow
  • The task is large enough that you want a document to guide several implementation passes

Choose the right level of planning

1. Lightweight plan

Use this when:

  • the ticket is already fairly descriptive
  • the change is small or medium
  • you mainly need clearer scope, steps, and verification

Output:

  • a short Markdown plan
  • usually 5-20 lines
  • enough for one focused implementation session

2. Full execution plan

Use this when:

  • the task may take multiple hours
  • the work spans multiple milestones
  • you need a living document during implementation
  • another engineer or agent should be able to continue from the plan alone

Output:

  • a self-contained plan in the style of PLANS.md
  • prose-first, explicit, and updateable during implementation

Process

  1. Read the ticket, product context, AGENTS.md, and relevant code before planning.
  2. Restate the goal in plain English.
  3. Decide whether this needs a lightweight plan or a full execution plan.
  4. If a material decision is missing, ask a concise question or state an explicit assumption.
  5. Write the plan so someone could implement from it without relying on hidden context.

What a lightweight plan should contain

  • Goal
  • Context
  • Scope
  • Non-goals
  • Proposed steps
  • Risks
  • Verification

Example:

# GRA-141 Plan

Goal: persist scraped jobs into Postgres while keeping CSV export.

Context:
- Current scraper exports CSV.
- We want minimal persistence without broadening scope into UI or API work.

Scope:
- Add DB configuration.
- Define a minimal jobs table.
- Persist jobs from the scraper flow.

Non-goals:
- No new UI.
- No API endpoints.
- No broad data model redesign.

Steps:
1. Add DB configuration and connection setup.
2. Define minimal `jobs` table.
3. Implement job upsert logic.
4. Wire scraper CLI to persist jobs.
5. Keep CSV export optional.
6. Add tests for upsert and rerun behavior.
7. Run review and cleanup.

Verification:
- Targeted tests pass.
- Existing CLI flow still works.

Read the full file on GitHub · 147 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. 4d ago First seen · 147 lines · 48 tokens per session scan A bf34f926df02

Subscribe to this mod's changes

plan is a skill published in the GitHub repository owainlewis/youtube-tutorials (375 stars, last pushed 12d ago), licensed MIT. It adds 48 tokens to every session and 915 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.