skill CX Codex

planner — Claude Code skill: what it does, how to install

Q: How to install planner in Claude Code?

Run `npx skills add am-will/codex-skills --skill planner -a claude-code` in your terminal. This writes the skill to `~/.claude/skills/planner/SKILL.md`.

Splits bug fixes and feature development into structured sprints and atomic tasks. It helps you design software changes before writing any code.

Install into Claude Code · Skills CLI (Vercel) All methods and platforms ↓

npx skills add am-will/codex-skills --skill planner -a claude-code

Open on GitHub

What planner does

The skill inspects codebase architecture and related components, then asks between five and ten clarifying questions regarding scope, edge cases, and tech constraints. When external libraries or APIs are involved, it pulls documentation using the Context7 skill. After clarifying requirements, it drafts an overview with incremental sprints where each milestone yields testable work.

Tasks within each sprint stay atomic and committable. The plan lists file paths, dependencies, and verification criteria. The skill saves the output as a Markdown file ending in -plan.md. Right after saving, it analyzes potential pitfalls and can prompt for up to three details about missing steps or edge cases.

Planner strictly avoids implementing code. If you expect an agent to start editing source files right away, this skill will slow you down because its only job is drafting the roadmap.

What it helps with

decompose a bug fix into atomic, committable tasks
clarify technical scope with targeted questions before coding
draft sprint structures with testable increments and rollback steps
catch missing dependencies and edge cases ahead of time

Example prompts for the agent

/planner map out token authentication in src/auth.ts
break this down into tasks: migrate cache layer to redis
/plan outline steps to resolve session memory leaks

How to install planner

1Skills CLI (Vercel)

npx skills add am-will/codex-skills --skill planner -a claude-code

2Manually: put the files in place

~/.claude/skills/planner/SKILL.md

Copy the whole skill folder; for one project use .claude/skills/planner/

1Skills CLI (Vercel)

npx skills add am-will/codex-skills --skill planner -a codex

2Manually: put the files in place

.agents/skills/planner/SKILL.md

For all projects use ~/.agents/skills/

1Skills CLI (Vercel)

npx skills add am-will/codex-skills --skill planner -a cursor

2Manually: put the files in place

.cursor/skills/planner/SKILL.md

Cursor also reads .agents/skills/ and .claude/skills/

1GitHub CLI

gh skill install am-will/codex-skills planner

2Manually: put the files in place

.github/skills/planner/SKILL.md

1Skills CLI (Vercel)

npx skills add am-will/codex-skills --skill planner -a gemini-cli

2Platform CLI

gemini skills install https://github.com/am-will/codex-skills --path skills/planner

Manually: put the files in place

.devin/skills/planner/SKILL.md

The legacy .windsurf/skills/ path still works

Skills CLI (Vercel)

npx skills add am-will/codex-skills --skill planner -a opencode

Step by step, with commands for each platform: How to install skills in Claude Code: five ways

Questions about planner

How to install planner in Claude Code?

Run npx skills add am-will/codex-skills --skill planner -a claude-code in your terminal. This writes the skill to ~/.claude/skills/planner/SKILL.md.

What does the planner skill do?

It surveys your codebase, asks clarifying questions, and compiles a Markdown implementation plan. The document includes sprints, atomic tasks, acceptance criteria, and rollback instructions.

Does planner implement the code for you?

No, planner only produces the plan file. It identifies gotchas and asks follow-up questions, leaving code execution to you or subsequent prompts.

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