write-plan-doc

A skill for writing structured implementation plans with project context, phases, success criteria, testing, and out-of-scope work. It saves the plan in the project's documented thoughts directory using the required naming format.

In plain words
What is it for?
Use it when planning a new feature or change, recording implementation phases, linking relevant project references, defining tests, and tracking progress.
Why use it?
It turns a feature idea into a shared written plan before implementation begins. This clarifies the current and desired state, the work sequence, and how completion will be checked.

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/eveld/claude/write-plan-doc
Any agent
npx skills add eveld/claude --skill write-plan-doc
Clone the repo
git clone --depth 1 https://github.com/eveld/claude

Made for: Claude Code, Codex.

Per session 24 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,022 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 $0.00024 $0.01022
Opus 5 $0.00012 $0.00511
Sonnet 5 $0.00005 $0.00204
Haiku 4.5 $0.00002 $0.00102

Measured 2d ago against content hash e99847b99084, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

write-plan-doc 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.

skills/write-plan-doc/SKILL.md · 148 lines

How it starts

The opening of the file, as written. The whole thing — 148 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Write Plan Document

Create structured implementation plans following project conventions.

Document Structure

Use the template from templates/plan-document.md:

  1. Overview - Brief description
  2. Current State Analysis - What exists now
  3. Desired End State - Specification and verification
  4. What We're NOT Doing - Explicit out-of-scope items
  5. Implementation Approach - High-level strategy
  6. Project References - Links to commands.md and testing.md
  7. Phases - Detailed implementation steps
  8. Changelog - Implementation tracking (created during implementation)
    • Not created by plan command
    • Implementation command creates and maintains it
    • Used for auto-correction loop
  9. Testing Strategy - Unit, integration, manual
  10. References - Links to tickets, research

File Path and Naming

Determine feature slug first using determine-feature-slug skill:

  • If implementing from existing research: Use same slug (same directory)
  • If new feature: Auto-detect namespace and next number, suggest description from plan title
  • Prompts user to accept or customize

Save to: thoughts/{namespace}/NNNN-description/plan.md

Example workflow:

  1. Planning from research doc thoughts/erik/0005-authentication/research.md
  2. Skill suggests: erik/0005-authentication (same directory)
  3. Document saved to: thoughts/erik/0005-authentication/plan.md

Collaboration: Plans start in personal namespace. Use share-docs skill to promote to thoughts/shared/ when ready for team implementation.

Backward compatibility: Old path thoughts/shared/plans/YYYY-MM-DD-NN-description.md still recognized.

Phase Structure

Each phase must include:

Overview - What this phase accomplishes

Changes Required - Specific files and code changes

Success Criteria - Split into two sections:

  • Automated Verification: Commands that can be run
  • Manual Verification: Human testing needed

Milestone Structure

Group related phases into testable milestones:

Read the full file on GitHub · 148 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 · 148 lines · 24 tokens per session scan A e99847b99084

Subscribe to this mod's changes

write-plan-doc is a skill published in the GitHub repository eveld/claude (10 stars, last pushed 6mo ago), licensed MIT. It adds 24 tokens to every session and 1,022 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.

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