plan

plan is a skill for Claude Code, Codex from psd401/psd-claude-plugins. It costs 48 tokens per session (1,031 once invoked), scanned A, original, MIT.

A planning workflow that turns a software request into tasks and a testable Definition of Done. The Definition of Done is a precise checklist for deciding whether the work is finished.

In plain words
What is it for?
Clarifying requirements, researching options, designing an approach, breaking work into tasks, and optionally creating GitHub issues for later implementation.
Why use it?
It surfaces unanswered questions and edge cases before coding, so the implementation has a clear target and can be checked consistently.

Skill for Claude CodeCodex

Part of the psd-coding-system plugin — 9 skills, 5 hooks 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/psd401/psd-claude-plugins/plan
Any agent
npx skills add psd401/psd-claude-plugins --skill plan
Clone the repo
git clone --depth 1 https://github.com/psd401/psd-claude-plugins

Made for: Claude Code, Codex.

Or install psd-coding-system, the plugin that ships this one along with the rest of its 9 skills, 5 hooks.

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/psd401/psd-claude-plugins/plan.svg)](https://agentmods.dev/skills/psd401/psd-claude-plugins/plan)
Your own site
<a href="https://agentmods.dev/skills/psd401/psd-claude-plugins/plan"><img src="https://agentmods.dev/badge/skills/psd401/psd-claude-plugins/plan.svg" alt="Measured on agentmods" height="20"></a>
Per session 48 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,031 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 $0.00048 $0.01031
Opus 5 $0.00024 $0.00515
Sonnet 5 $0.00010 $0.00206
Haiku 4.5 $0.00005 $0.00103

Measured 3d ago against content hash 3865f7d8857e, 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 3d 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.

plugins/psd-coding-system/skills/plan/SKILL.md · 82 lines

How it starts

The opening of the file, as written. The whole thing — 82 lines — stays where its author put it; the contents beside it link to each section on GitHub.

PLAN — clarify, research, design, define done

The single planning surface. It scales from a quick fix to a full feature. It absorbs the old /architect, /brainstorm, /scope, /product-manager, /deepen-plan, and /issue. Its output is always the same shape: a task breakdown plus a machine-checkable Definition of Done — the exact contract /lfg drives to.

Capture the intent behind the request, not just the request — who the work is for and what it unblocks shapes the design more than any checklist. The phases below are the shape of the output; scale your depth within them to the problem.

Target: $ARGUMENTS

Contracts: docs/patterns/definition-of-done.md, docs/patterns/issue-contract.md.

Phase 1: Clarify first (don't code the wrong thing)

Surface the unknowns before designing. Ask the sharp questions a senior engineer would — edge cases, failure modes, scope boundaries, who the user is, what "done" means. Use AskUserQuestion for the few decisions that genuinely change the design. Keep going until you could write a testable Definition of Done without guessing.

If $ARGUMENTS is an existing issue number, read it (gh issue view N --comments) and refine rather than restart.

Phase 2: Size it

  • Small (a fix, a contained change) → skip straight to a tight DoD + a short task list.
  • Medium (a feature) → research + design + DoD + task breakdown.
  • Large (a system / multi-surface effort) → add architecture and a short PRD section (problem, users, success metrics, risks), then decompose into several contract-compliant issues.

State which size you picked and why.

Phase 3: Research (parallel)

Dispatch in parallel via Task (skip any that don't apply):

  • learnings-researcher — prior learnings in this repo.
  • repo-research-analyst — how this codebase does this today; conventions to follow.
  • best-practices-researcher / framework-docs-researcher — external patterns, and confirm nothing recommended is deprecated.
  • spec-flow-analyzer — user-flow permutations and edge cases.
  • architect-specialist (large only) — architecture options and trade-offs.

Read the full file on GitHub · 82 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. 3d ago First seen · 82 lines · 48 tokens per session scan A 3865f7d8857e

Subscribe to this mod's changes

plan is a skill published in the GitHub repository psd401/psd-claude-plugins (2 stars, last pushed 2d ago), licensed MIT. It adds 48 tokens to every session and 1,031 once invoked, about $0.0002 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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