implement-plan

A procedure for carrying out an approved technical plan stored in a project folder. It coordinates implementation, testing, review, and progress updates across the plan's phases.

In plain words
What is it for?
Reading a plan, checking completed items, delegating implementation and reviews, running verification commands, and updating the plan's progress.
Why use it?
It turns a written plan into tracked work with verification, while keeping the implementation and quality checks organized by phase.

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/nikeyes/stepwise-dev/implement-plan
Any agent
npx skills add nikeyes/stepwise-dev --skill implement-plan
Clone the repo
git clone --depth 1 https://github.com/nikeyes/stepwise-dev

Made for: Claude Code, Codex.

Per session 13 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,360 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 $0.00013 $0.01360
Opus 5 $0.00006 $0.00680
Sonnet 5 $0.00003 $0.00272
Haiku 4.5 $0.00001 $0.00136

Measured 2d ago against content hash 4a0d3e402e77, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

implement-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 2d 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.

core/skills/implement-plan/SKILL.md · 165 lines

How it starts

The opening of the file, as written. The whole thing — 165 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Implement Plan

You are tasked with implementing an approved technical plan from thoughts/shared/plans/. These plans contain phases with specific changes and success criteria.

Getting Started

When given a plan path:

  • Read the plan completely and check for any existing checkmarks (- [x])
  • Read the original ticket if referenced
  • Create a todo list to track your progress (one item per phase)
  • Then follow the Phase Cycle below for each phase

Do NOT read source or test files mentioned in the plan. The delegated skills will read them. Your role is orchestrator: you understand the plan's structure and delegate execution. If you read the implementation files, you will be tempted to implement directly — that defeats the purpose of this skill.

If no plan path provided, ask for one.

Your Role: Orchestrator

Your job is to coordinate, not to implement on your own initiative:

  • Understand what each phase needs to accomplish
  • Delegate implementation to /stepwise-core:tdd — let it decide what to write and when
  • Delegate quality checks to /stepwise-core:bugmagnet and /stepwise-core:test-desiderata
  • Run verification commands and update progress

You may edit files when a delegated skill instructs you to. What you must not do is decide on your own to write code, add tests, or modify source files.

If a delegated skill reports a structural mismatch (file doesn't exist, architecture changed), STOP and ask the user:

Issue in Phase [N]:
Expected: [what the plan says]
Found: [actual situation]
Why this matters: [explanation]

How should I proceed?

Phase Cycle

For each phase in the plan, follow this cycle in order:

Step 1 — Delegate to TDD skill

Invoke /stepwise-core:tdd using the Skill tool. Pass it:

  • The phase description (copy the relevant section from the plan)
  • The file paths that need to be created or modified
  • The success criteria for this phase

Read the full file on GitHub · 165 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. 2d ago First seen · 165 lines · 13 tokens per session scan A 4a0d3e402e77

Subscribe to this mod's changes

implement-plan is a skill published in the GitHub repository nikeyes/stepwise-dev (24 stars, last pushed 13d ago), licensed Apache-2.0. It adds 13 tokens to every session and 1,360 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 2026-08-30.

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