plan

plan is a skill for Claude Code, Codex from ai-swiss/base. It costs 35 tokens per session (529 once invoked), scanned A, original, Apache-2.0.

A code-planning guide that turns a software request into a detailed, step-by-step implementation plan.

In plain words
What is it for?
Use it to break a change into vertical slices, document design decisions, identify likely traps, and define exact verification commands.
Why use it?
It reduces guesswork by grounding the plan in the existing code and recording decisions, rules, and checks before consequential work begins.

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/ai-swiss/base/plan
Any agent
npx skills add ai-swiss/base --skill plan
Clone the repo
git clone --depth 1 https://github.com/ai-swiss/base

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/ai-swiss/base/plan.svg)](https://agentmods.dev/skills/ai-swiss/base/plan)
Your own site
<a href="https://agentmods.dev/skills/ai-swiss/base/plan"><img src="https://agentmods.dev/badge/skills/ai-swiss/base/plan.svg" alt="Measured on agentmods" height="20"></a>
Per session 35 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 529 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 $0.00035 $0.00529
Opus 5 $0.00017 $0.00264
Sonnet 5 $0.00007 $0.00106
Haiku 4.5 $0.00003 $0.00053

Measured 3d ago against content hash 532065ae6fe1, 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.

.ai/agents/base-contributor/skills/processes/plan/SKILL.md · 50 lines

What it actually says

Plan a change

A plan turns intent into something a junior or a context-free agent can follow without inventing. The doctrine lives in skills/competences/code-planning/SKILL.md; load it and apply it. The shape lives in templates/plan.md.

Steps

  1. Ground first. Run understand-state (or read specs/ and the matrix) so the plan rests on what exists, not on memory.
  2. Ask only design-changing questions. Three at most, each with concrete options; if visual, an ASCII mock-up per option. Record the answers in the plan's Origin section. If the user proposes something better, take it.
  3. Write the plan to .plans/YYYY-MM-DD_subject.md from templates/plan.md: origin, non-negotiable rules + exact verification commands, engineering doctrine (named principles anchored in this ticket), the slice table, detailed vertical slices, known traps, the self-review grid, the definition of done.
  4. Keep slices vertical, green, irreversible. Each one crosses all layers and ships observable behaviour; each ends with every gate green; each kills the code it replaces in the same slice.
  5. Hand off to implement, slice by slice.

What you never do

  • Write truth into the plan: the plan is disposable, the code and specs/ are the source.
  • Leave a fuzzy task (no end test means not ready) or plan speculative generality for two cases.
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 · 50 lines · 35 tokens per session scan A 532065ae6fe1

Subscribe to this mod's changes

plan is a skill published in the GitHub repository ai-swiss/base (42 stars, last pushed 20d ago), licensed Apache-2.0. It adds 35 tokens to every session and 529 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 2026-08-30.

Related

Other skills, from other repositories

pr-to-video

Turn a GitHub pull request (a PR URL, owner/repo#N, or 'this PR' in a checked-out repo) into a code-change explainer video — changelog, feature reveal, fix, or refactor walkthrough built from the diff, commits, and files: the input is a code change, not a website. Not a product promo (/product-launch-video) or a no-PR…

heygen-com/hyperframes · 104 tokens

general-video

Author or edit a custom HyperFrames composition when no specialized workflow fits, or when BRIEF.md sets flow: companion. Use for longer or multi-scene pieces, brand and sizzle reels, montages, static loops, static title cards, footage remixes, and freeform builds. Use motion-graphics instead for a short unnarrated…

heygen-com/hyperframes · 92 tokens

motion-graphics

A short, design-led motion graphic where motion is the message — kinetic typography, stat count-up, chart/data-viz hit, logo sting / brand lockup, lower-third / callout / social overlay, animated map (highlight regions, connect places, zoom to a location), animated tweet / news-article / headline, webpage / UI…

heygen-com/hyperframes · 139 tokens

implementation-final-review

Perform the repository's risk-tiered independent final review before implementation completion. Use only when explicitly invoked or when repository instructions require it after behavior-impacting implementation work; audit the complete task diff, supported contracts, lifecycle and security boundaries, complexity, and…

openai/openai-agents-python · 58 tokens

hyperframes-core

The HyperFrames composition contract — build one renderable project. Use for composition structure, the data- timing attributes, class="clip", tracks, sub-compositions, variables, framework-owned media playback, deterministic-render rules, and validation. Also covers Tailwind projects and the STORYBOARD.md / SCRIPT.md…

heygen-com/hyperframes · 77 tokens

technical-writing

Write, edit, review, or audit user-facing documentation for the eve repository. Use for changes under docs/, documentation tied to eve APIs or CLI behavior, docs work based on Slack or support feedback, and requests to make eve docs clearer, more natural, or less AI-patterned while verifying claims against current…

vercel/eve · 78 tokens