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skill CX Codex

plan-harder — Claude Code skill: what it does, how to install

Turns complex requests into structured sprint plans with atomic tasks. Triggers when you tell the agent to plan harder, focusing purely on architecture and risks.

Install into Claude Code · Skills CLI (Vercel) All methods and platforms ↓ 
npx skills add am-will/codex-skills --skill plan-harder -a claude-code
Open on GitHub

What plan-harder does

The skill triggers when you explicitly include "plan harder" in your prompt. It inspects the codebase layout, architectural patterns, and existing components. If requirements lack clarity, it asks up to 10 questions using the request_user_input tool before finalizing the plan.

The plan organizes work into testable sprints with small committable tasks, dependencies, and file paths. It saves the output to a kebab-case file with a -plan.md suffix. Once saved, the agent inspects the document for potential pitfalls and asks a subagent to review the file.

Keep in mind that this skill only plans. It maps out edge cases and rollback steps, but it will deliberately refuse to write any implementation code.

What it helps with

  • break complex features into verifiable sprints
  • generate atomic task lists with explicit file paths
  • spot architecture edge cases before editing code
  • save technical specifications into a Markdown file

Example prompts for the agent

  • plan harder: migrate the auth flow to OAuth
  • fix the race condition in worker jobs, plan harder
  • plan harder for splitting the database service

How to install plan-harder

1Skills CLI (Vercel)

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

2Manually: put the files in place

~/.claude/skills/plan-harder/SKILL.md

Copy the whole skill folder; for one project use .claude/skills/plan-harder/

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

Questions about plan-harder

How to install plan-harder in Claude Code?

Run npx skills add am-will/codex-skills --skill plan-harder -a claude-code. Alternatively, place the file directly at ~/.claude/skills/plan-harder/SKILL.md.

What does the plan-harder skill do?

It researches your codebase, asks clarifying questions, and drafts a phased sprint plan with acceptance criteria. The resulting plan is saved as a Markdown file with a -plan.md suffix.

Does plan-harder implement the generated tasks?

No. The agent is explicitly instructed to only create the plan, check for pitfalls, and gather subagent feedback without writing implementation code.

Similar skills

All skills for Agent setup: memory, context, orchestration →
alan-plan tryalan-ai Walks the agent through planning: analyze the task, ask clarifying questions, draft the plan and persist it as an Alan artifact. CX Codex +1 1,800installs update-implementation-plan official github Updates an existing implementation plan for new requirements, refactoring, package upgrades, or architecture changes. Use it when a plan needs actionable tasks and checks. 11,107installs Implementation Plan Generation Mode official github Writes a structured implementation plan for a new feature or a refactor. It leaves your code alone and breaks the work into phases and tasks. ★ 40,418repo stars ce-plan EveryInc Builds structured technical implementation plans without touching production code. Useful when scoping features before passing work to execution agents. CX Codex +1 3,700installs ralph-plan mastra-ai An interactive planning skill for Claude Code and coding agents. It helps build structured ralph-loop commands through guided dialog and codebase exploration. CX Codex +1 2,600installs speckit-plan github-spec-kit Executes implementation planning workflows inside spec-kit projects to produce research notes and interface contracts. CX Codex +1 2,500installs

From the same set13

openai-docs-skill Pulls current OpenAI developer documentation through an MCP server without leaving the terminal. Handy when the agent writes Responses API or SDK code and guessing parameters is not an option. CX Codex +1 1,200installs gemini-computer-use Runs Gemini 2.5 Computer Use agents with Playwright to drive browser workflows. It captures screenshots, calls UI actions, and prompts for confirmation on risky steps. CX Codex +1 1,200installs llm-council This skill runs several CLI agents as independent planners, strips their identities, and merges the results into one final plan. Useful when a single model's bias is the problem. CX Codex +1 1,200installs Agent Browser A skill that hands your agent a Rust-based headless browser: navigate, click, fill forms and snapshot pages through structured commands. CX Codex +1 1,200installs parallel-task This skill reads a development plan and assigns ready tasks to subagents in parallel. Use it to follow task dependencies and keep progress recorded in the plan. CX Codex +1 1,200installs read-github Lets the agent pull documentation and code from any GitHub repository through the gitmcp.io MCP service. Useful when you need to understand a project without cloning it. CX Codex +1 1,200installs planner Splits bug fixes and feature development into structured sprints and atomic tasks. It helps you design software changes before writing any code. CX Codex +1 1,200installs super-swarm-spark Turns a markdown plan into a queue of subagent tasks and keeps a rolling pool busy until the code is integrated and tested. CX Codex +1 1,100installs

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