capstone

capstone is a skill for Claude Code, Codex from OutlineDriven/odin-claude-plugin. It costs 57 tokens per session (369 once invoked), scanned A, original, Apache-2.0.

A learning-project workflow for building one runnable, readable or usable project from concepts the learner has already cleared. TDD means test-driven development, but it is not mentioned in the provided description.

In plain words
What is it for?
Use it to read the learner’s progress, choose a suitable project, write milestones and a completion test, then assess the finished result.
Why use it?
It prevents a project from being sized beyond the learner’s current knowledge. It also defines an observable completion test and reviews the finished work against the original brief.

Skill for Claude CodeCodex

Written for Claude Code and Codex: argument-hint in frontmatter, but also agents/openai.yaml present.

Part of the odin plugin — 29 skills, 14 plugins 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/outlinedriven/odin-claude-plugin/capstone
Any agent
npx skills add OutlineDriven/odin-claude-plugin --skill capstone
Clone the repo
git clone --depth 1 https://github.com/OutlineDriven/odin-claude-plugin

Made for: Claude Code, Codex.

Or install odin, the plugin that ships this one along with the rest of its 29 skills, 14 plugins.

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 capstone

README.md
[![agentmods](https://agentmods.dev/badge/skills/outlinedriven/odin-claude-plugin/capstone.svg)](https://agentmods.dev/skills/outlinedriven/odin-claude-plugin/capstone)
Your own site
<a href="https://agentmods.dev/skills/outlinedriven/odin-claude-plugin/capstone"><img src="https://agentmods.dev/badge/skills/outlinedriven/odin-claude-plugin/capstone.svg" alt="Measured on agentmods" height="20"></a>
Per session 57 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 369 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 5.1 $0.00057 $0.00369
Opus 5 $0.00028 $0.00185
Sonnet 5 $0.00011 $0.00074
Haiku 4.5 $0.00006 $0.00037

Measured 6d ago against content hash 4f73f7e00553, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

capstone 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 6d 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/capstone/SKILL.md · 27 lines

What it actually says

Turn what the learner has cleared into something runnable, readable, or usable. One project per run.

Scope it

Read PROGRESS.md for what is cleared (its independent rung passed with no hints). The project may use only cleared concepts plus at most one unfamiliar one; two or more and it is a tutorial. Ask for the domain when the argument does not carry it. No PROGRESS.md means ask what the user can already do, once, and size to the answer.

The brief

Write the brief to capstone-<slug>.md at the workspace root, per references/BRIEF-FORMAT.md. The brief carries the done test, the milestones, and the concepts exercised.

Review it

When the learner brings the finished work back, judge it against the done test and the concept list item by item, then name the concepts the work shows they have not cleared. Hand those to drill, which owns the record; this skill writes no progress lines.

Rules

  • The done test is observable by someone else. "Understand X" is not a done test.
  • The project produces something runnable, readable, or usable. Anything smaller is an exercise; send it to drill.
  • Review against the brief's done test and concept list, item by item.
  • Order milestones so each one leaves something that works.
Files

What ships with it

2 files 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. 6d ago First seen · 27 lines · 57 tokens per session scan A 4f73f7e00553

Subscribe to this mod's changes

capstone is a skill published in the GitHub repository OutlineDriven/odin-claude-plugin (35 stars, last pushed today), licensed Apache-2.0. It adds 57 tokens to every session and 369 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 2026-08-30.

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