writing-plans

writing-plans is a skill for Claude Code, Codex from StringKe/ai-agents. It costs 65 tokens per session (833 once invoked), scanned A, original, no licence file.

A method for turning design specifications into a detailed implementation plan called plan.md. It breaks the work into small tasks and follows principles that avoid repetition and unnecessary features.

In plain words
What is it for?
Use it to write fine-grained development plans from design specifications, with small tasks suitable for carrying out one at a time.
Why use it?
It makes a large feature easier to implement by giving each step a clear, manageable scope. The plan keeps work aligned with the design while limiting avoidable complexity.

Skill for Claude CodeCodex

Part of the ai-agents plugin — 16 skills, 1 agent, 2 MCP servers shipped together

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/stringke/ai-agents/writing-plans
Any agent
npx skills add StringKe/ai-agents --skill writing-plans
Clone the repo
git clone --depth 1 https://github.com/StringKe/ai-agents

Made for: Claude Code, Codex.

Or install ai-agents, the plugin that ships this one along with the rest of its 16 skills, 1 agent, 2 MCP servers.

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 writing-plans

README.md
[![agentmods](https://agentmods.dev/badge/skills/stringke/ai-agents/writing-plans.svg)](https://agentmods.dev/skills/stringke/ai-agents/writing-plans)
Your own site
<a href="https://agentmods.dev/skills/stringke/ai-agents/writing-plans"><img src="https://agentmods.dev/badge/skills/stringke/ai-agents/writing-plans.svg" alt="Measured on agentmods" height="20"></a>
Per session 65 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 833 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin unknown 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 $0.00065 $0.00833
Opus 5 $0.00032 $0.00417
Sonnet 5 $0.00013 $0.00167
Haiku 4.5 $0.00006 $0.00083

Measured 4d ago against content hash f86b6e199609, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

writing-plans 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.

skills/writing-plans/SKILL.md · 103 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

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. 4d ago First seen · 103 lines · 65 tokens per session scan A f86b6e199609

Subscribe to this mod's changes

writing-plans is a skill published in the GitHub repository StringKe/ai-agents (9 stars, last pushed 5mo ago), with no licence file. It adds 65 tokens to every session and 833 once invoked, about $0.0003 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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