build-plan

build-plan is a skill for Claude Code from shawnclybor/clybor-claude-tooling. It costs 122 tokens per session (2,341 once invoked), scanned A, original, no licence file.

A planning tool that turns a product requirements document, or PRD, into a step-by-step implementation plan. It identifies required reading, a similar part of the codebase to follow, tasks, and the acceptance test, without writing code.

In plain words
What is it for?
Use it to plan a build from a PRD and define how the finished result will be evaluated.
Why use it?
It makes the work and its checks explicit before implementation begins, reducing guesswork about what to read and build.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter.

Good fit Use it to plan a build from a PRD and define how the finished result will be evaluated.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/shawnclybor/clybor-claude-tooling/build-plan
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.

Any agent
npx skills add shawnclybor/clybor-claude-tooling --skill build-plan
Clone the repo
git clone --depth 1 https://github.com/shawnclybor/clybor-claude-tooling

Made for: Claude Code.

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 build-plan

README.md
[![agentmods](https://agentmods.dev/badge/skills/shawnclybor/clybor-claude-tooling/build-plan/github.svg)](https://agentmods.dev/skills/shawnclybor/clybor-claude-tooling/build-plan)
Your own site
<a href="https://agentmods.dev/skills/shawnclybor/clybor-claude-tooling/build-plan"><img src="https://agentmods.dev/badge/skills/shawnclybor/clybor-claude-tooling/build-plan/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for build-plan

Your own site · 80×15
<a href="https://agentmods.dev/skills/shawnclybor/clybor-claude-tooling/build-plan"><img src="https://agentmods.dev/badge/skills/shawnclybor/clybor-claude-tooling/build-plan.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 122 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,341 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.00122 $0.02341
Opus 5 $0.00061 $0.01171
Sonnet 5 $0.00024 $0.00468
Haiku 4.5 $0.00012 $0.00234

Measured 7d ago against content hash 1e9b784fdcbf, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

build-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 7d 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.

.claude/skills/build-plan/SKILL.md · 147 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

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. 7d ago First seen · 147 lines · 122 tokens per session scan A 1e9b784fdcbf

Subscribe to this mod's changes

build-plan is a skill published in the GitHub repository shawnclybor/clybor-claude-tooling (5 stars, last pushed 7d ago), with no licence file. It adds 122 tokens to every session and 2,341 once invoked, about $0.0006 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 2026-09-05.