idea

idea is a command for coding agents from majiayu000/spellbook. It costs 35 tokens per session (163 once invoked), scanned A, original, MIT.

A command that guides a raw product idea through a structured process ending in a product requirements document and a clickable HTML prototype. A product requirements document describes what a product should do and why.

In plain words
What is it for?
Use it to develop an idea, check each stage before continuing, resume or list project work, export results, and produce an initial interactive prototype.
Why use it?
It helps turn a vague idea into a defined product while actively questioning assumptions and limiting unnecessary features.

Command

Part of the idea-coach plugin — 5 skills, 2 commands 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 commands/majiayu000/spellbook/idea
Clone the repo
git clone --depth 1 https://github.com/majiayu000/spellbook

Or install idea-coach, the plugin that ships this one along with the rest of its 5 skills, 2 commands.

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 idea

README.md
[![agentmods](https://agentmods.dev/badge/commands/majiayu000/spellbook/idea.svg)](https://agentmods.dev/commands/majiayu000/spellbook/idea)
Your own site
<a href="https://agentmods.dev/commands/majiayu000/spellbook/idea"><img src="https://agentmods.dev/badge/commands/majiayu000/spellbook/idea.svg" alt="Measured on agentmods" height="20"></a>
Per session 35 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 163 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 $0.00035 $0.00163
Opus 5 $0.00017 $0.00081
Sonnet 5 $0.00007 $0.00033
Haiku 4.5 $0.00003 $0.00016

Measured 6d ago against content hash 9d4642dc0f71, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-05, from the pricing page.

Security

Grade A, and why

idea 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.

plugins/idea-coach/commands/idea.md · 12 lines

What it actually says

按本插件的 idea-to-product skill 执行想法到产品的完整流程。

  • 用户输入:$ARGUMENTS
  • 参数为空时,先问用户要一句话想法,不要自己编
  • resume / list / export 分支按该 skill 的「命令变体」一节处理
  • 严格遵守该 skill 的 7 阶段顺序、Pre-下一阶段 checklist 和 Red Flags 表
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 · 12 lines · 35 tokens per session scan A 9d4642dc0f71

Subscribe to this mod's changes

idea is a command published in the GitHub repository majiayu000/spellbook (265 stars, last pushed today), licensed MIT. It adds 35 tokens to every session and 163 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.