plan

plan is a skill for Claude Code, Codex from rickywo/Formic. It costs 25 tokens per session (851 once invoked), scanned A, original, MIT.

An implementation-planning tool for Formic tasks, based on an existing feature specification.

In plain words
What is it for?
Use it to read a task specification and create PLAN.md and subtasks.json files describing the work.
Why use it?
It turns a feature request into a written plan and smaller work items, so the implementation has a clear structure before coding starts.

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/rickywo/formic/plan
Any agent
npx skills add rickywo/Formic --skill plan
Clone the repo
git clone --depth 1 https://github.com/rickywo/Formic

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 plan

README.md
[![agentmods](https://agentmods.dev/badge/skills/rickywo/formic/plan.svg)](https://agentmods.dev/skills/rickywo/formic/plan)
Your own site
<a href="https://agentmods.dev/skills/rickywo/formic/plan"><img src="https://agentmods.dev/badge/skills/rickywo/formic/plan.svg" alt="Measured on agentmods" height="20"></a>
Per session 25 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 851 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 $0.00025 $0.00851
Opus 5 $0.00013 $0.00426
Sonnet 5 $0.00005 $0.00170
Haiku 4.5 $0.00003 $0.00085

Measured 4d ago against content hash ba44bbe774cf, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

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 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/plan/SKILL.md · 129 lines

How it starts

The opening of the file, as written. The whole thing — 129 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Plan Skill - Generate Implementation Plan & Subtasks

You are a senior Technical Project Manager. Your task is to generate implementation planning documents based on an existing feature specification.

Task Title: $TASK_TITLE

Task ID: $TASK_ID

Task Docs Path: $TASK_DOCS_PATH


Instructions

Step 1: Read the Feature Specification

Read the README.md file at $TASK_DOCS_PATH/README.md to understand:

  • The task's goals and objectives
  • Key capabilities to implement
  • Non-goals (what to avoid)
  • Requirements to fulfill

Also read kanban-development-guideline.md in the project root if it exists for project-specific standards.


Step 2: Generate PLAN.md

Create a high-level implementation overview for human readers. Write to: $TASK_DOCS_PATH/PLAN.md

# [Task Title] - Implementation Plan

## Status
**PENDING** - Plan created, implementation to begin.

## Context
[1-2 sentences summarizing the task from README.md]

## Implementation Overview

### Phase 1: [First logical grouping]
[Brief description of what this phase accomplishes]

### Phase 2: [Second logical grouping]
[Brief description of what this phase accomplishes]

### Phase 3: [Third logical grouping if needed]
[Brief description of what this phase accomplishes]

## Key Milestones
- [Milestone 1]
- [Milestone 2]
- [Milestone 3]

## Success Criteria
- [Measurable outcome 1]
- [Measurable outcome 2]

Step 3: Generate subtasks.json

Create a structured subtask list that the agent will use as the source of truth during execution. Write to: $TASK_DOCS_PATH/subtasks.json

The subtasks.json file MUST follow this exact schema:

{
  "version": "1.0",
  "taskId": "$TASK_ID",
  "title": "$TASK_TITLE",
  "createdAt": "[ISO 8601 timestamp]",
  "updatedAt": "[ISO 8601 timestamp]",
  "subtasks": [
    {
      "id": "1",
      "content": "[Specific actionable task - be precise about files/functions]",
      "status": "pending"
    },
    {
      "id": "2",
      "content": "[Another specific actionable task]",
      "status": "pending"
    }
  ]
}

Read the full file on GitHub · 129 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 · 129 lines · 25 tokens per session scan A ba44bbe774cf

Subscribe to this mod's changes

plan is a skill published in the GitHub repository rickywo/Formic (41 stars, last pushed 1mo ago), licensed MIT. It adds 25 tokens to every session and 851 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 2026-08-30.

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