implement-plan

implement-plan is a skill for Claude Code, Codex from nikeyes/stepwise-dev. It costs 13 tokens per session (1,345 once invoked), scanned A, original, Apache-2.0.

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

Written for Claude Code and Codex: disable-model-invocation in frontmatter, but also agents/openai.yaml present. Also seen: model in frontmatter.

Part of the stepwise-core plugin — 14 skills, 10 agents shipped together

Good fit Reading a plan, checking completed items, delegating implementation and reviews, running verification commands, and updating the plan's progress.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/nikeyes/stepwise-dev/implement-plan
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.

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.

Or install stepwise-core, the plugin that ships this one along with the rest of its 14 skills, 10 agents.

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 implement-plan

README.md
[![agentmods](https://agentmods.dev/badge/skills/nikeyes/stepwise-dev/implement-plan/github.svg)](https://agentmods.dev/skills/nikeyes/stepwise-dev/implement-plan)
Your own site
<a href="https://agentmods.dev/skills/nikeyes/stepwise-dev/implement-plan"><img src="https://agentmods.dev/badge/skills/nikeyes/stepwise-dev/implement-plan/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for implement-plan

Your own site · 80×15
<a href="https://agentmods.dev/skills/nikeyes/stepwise-dev/implement-plan"><img src="https://agentmods.dev/badge/skills/nikeyes/stepwise-dev/implement-plan.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 13 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,345 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
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 5.1 $0.00013 $0.01345
Opus 5.5 $0.00005 $0.00538
Sonnet 5.5 $0.00003 $0.00269
Haiku 4.5 $0.00001 $0.00135

Measured 8d ago against content hash 6d9c5e4e955f, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, 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 8d 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 · 144 lines

How it starts

The opening of the file, as written. The whole thing — 144 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, /stepwise-core:mutation-testing 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 · 144 lines

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 8d ago Changed · +12 lines 6d9c5e4e955f
  2. 9d ago Changed · -33 lines be148fb6ba1a
  3. 1mo ago Changed d4df02c617ec
  4. 1mo ago Changed 21b25685c309
  5. 1mo 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 6d ago), licensed Apache-2.0. It adds 13 tokens to every session and 1,345 once invoked, about $0.0001 per session on Opus 5.5. 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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