impl

impl is a skill for Claude Code, Codex from AlanHuang168/AI-Project-Workflow. It costs 0 tokens per session (699 once invoked), scanned A, original, MIT.

An implementation stage that builds a project from its approved requirements, architecture, detailed design, and test plan.

In plain words
What is it for?
Use it to implement the approved scope, run suitable verification, update workflow state, and report real results and remaining risks.
Why use it?
It prevents coding from starting without the documents and workflow approvals needed to define the intended behavior.

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/alanhuang168/ai-project-workflow/impl
Any agent
npx skills add AlanHuang168/AI-Project-Workflow --skill impl
Clone the repo
git clone --depth 1 https://github.com/AlanHuang168/AI-Project-Workflow

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 impl

README.md
[![agentmods](https://agentmods.dev/badge/skills/alanhuang168/ai-project-workflow/impl.svg)](https://agentmods.dev/skills/alanhuang168/ai-project-workflow/impl)
Your own site
<a href="https://agentmods.dev/skills/alanhuang168/ai-project-workflow/impl"><img src="https://agentmods.dev/badge/skills/alanhuang168/ai-project-workflow/impl.svg" alt="Measured on agentmods" height="20"></a>
Per session 0 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 699 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 $0.00000 $0.00699
Opus 5 $0.00000 $0.00349
Sonnet 5 $0.00000 $0.00140
Haiku 4.5 $0.00000 $0.00070

Measured 4d ago against content hash 65aa6e6e3e7e, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

impl 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.

adapters/catpaw/.catpaw/skills/impl/SKILL.md · 91 lines

How it starts

The opening of the file, as written. The whole thing — 91 lines — stays where its author put it; the contents beside it link to each section on GitHub.


name: impl description: Implement the project according to the approved PRD, architecture, detailed design, and test plan. Use when the user asks to begin implementation or invokes /impl. version: 1.0.0 stage: impl

Goal

Implement strictly according to the approved SDD and Test Plan, run suitable verification, and report real results.

Use Cases

  • The user invokes /impl.
  • The user asks to begin implementation.
  • The user asks to implement according to the SDD.

Preconditions

  • docs/PRD.md, docs/ARCH.md, docs/SDD.md, and docs/TEST.md exist and are not empty.
  • Workflow state shows sdd complete unless the user explicitly approves a skip and the reason is recorded.

Required Context

  • AGENTS.md
  • .ai-workflow/state.json
  • core/rules/execution-policy.md
  • core/rules/verification-policy.md
  • docs/PRD.md
  • docs/ARCH.md
  • docs/SDD.md
  • docs/TEST.md
  • Relevant source and test directories

Inputs

  • Approved SDD and Test Plan.
  • Explicit implementation scope from the user.

Allowed Changes

  • Business code and test code defined by the SDD.
  • Necessary build, configuration, README, or script files.
  • .ai-workflow/state.json
  • Do not add business behavior that the SDD does not define.

Steps

  1. Confirm that upstream documents exist and are not empty.
  2. Extract tasks, interfaces, data structures, state transitions, error handling, and implementation order from the SDD.
  3. Extract acceptance criteria and verification commands from the Test Plan.
  4. Implement in small scoped steps according to the SDD.
  5. Stop and ask the user if the SDD does not cover a required business scenario.
  6. Run suitable build, test, or static checks after implementation.
  7. If verification fails, fix and rerun when possible. If not possible, report the failure and remaining risk.
  8. Write or update the implementation report when the project convention requires one.
  9. Update workflow state: add impl to completedStages, set currentStage = "review", and update the timestamp.

Read the full file on GitHub · 91 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 · 91 lines · 0 tokens per session scan A 65aa6e6e3e7e

Subscribe to this mod's changes

impl is a skill published in the GitHub repository AlanHuang168/AI-Project-Workflow (27 stars, last pushed 1mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 699 tokens. 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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