how-to-create-implementation-plan

how-to-create-implementation-plan is a skill for Claude Code, Codex from ApexIQ/skillsmith. It costs 23 tokens per session (440 once invoked), scanned A, original, MIT.

A guide to writing a technical implementation plan before coding a feature. It organizes the goal, proposed file changes, verification steps, risks, and decisions for review.

In plain words
What is it for?
Use it to plan frontend, backend, or database changes, define automated and manual checks, document alternatives, and divide large work into phases.
Why use it?
It turns a vague feature request into an agreed plan and helps reveal missing work, breaking changes, and scope that is too large.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to plan frontend, backend, or database changes, define automated and manual checks, document alternatives, and divide large work into phases.

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Install with agentmods
npx agentmods add skills/apexiq/skillsmith/how_to_create_implementation_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 ApexIQ/skillsmith --skill how_to_create_implementation_plan
Clone the repo
git clone --depth 1 https://github.com/ApexIQ/skillsmith

Made for: Claude Code, Codex.

Wrote this? Show the measurements

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README.md
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Per session 23 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 440 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.
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 $0.00023 $0.00440
Opus 5 $0.00012 $0.00220
Sonnet 5 $0.00005 $0.00088
Haiku 4.5 $0.00002 $0.00044

Measured 8d ago against content hash 25abae5b1b4c, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

how-to-create-implementation-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.

.agent/skills/how_to_create_implementation_plan/SKILL.md · 57 lines

What it actually says

📝 How to Create an Implementation Plan

Why: A plan is a contract. It prevents "scope creep" and ensures alignment before coding.

1. Structure (The Blueprint)

Every implementation plan should include:

A. Goal & Overview

  • Goal: 1-sentence summary (e.g., "Add user authentication").
  • Background: Why is this needed? What problem does it solve?
  • User Review: Flag breaking changes or significant tech decisions.

B. Proposed Changes

Group by component (Frontend/Backend/Database).

  • [NEW] File/component to create.
  • [MODIFY] Existing file + bullet points of changes.
  • [DELETE] Files to remove.

C. Verification Plan

  • Automated Tests: What tests will cover this?
  • Manual Testing: Step-by-step "click path" to verify the feature.

D. Risks & Considerations

  • What could go wrong?
  • Are there alternative approaches?

2. Methodology

  1. Research First: Understand the existing code before proposing changes.
  2. Think in Systems: If you add a frontend button, does the backend API exist?
  3. Keep it Bite-Sized: Plans >3 days of work should be split into phases.

3. Checklist

  • Is the goal clearly stated?
  • Are all affected files listed?
  • Is the verification plan executable?
  • Have risks been considered?

Examples

  • Good plan: Clear goal, specific file changes, test plan included.
  • Bad plan: Vague "refactor backend", no specifics.

Guidelines

  • Get plan approved before writing code.
  • Update the plan if scope changes during implementation.
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 First seen · 57 lines · 23 tokens per session scan A 25abae5b1b4c

Subscribe to this mod's changes

how-to-create-implementation-plan is a skill published in the GitHub repository ApexIQ/skillsmith (5 stars, last pushed 5mo ago), licensed MIT. It adds 23 tokens to every session and 440 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 2026-08-31.