write-spec

An instruction for writing a feature specification or product requirements document (PRD) from a problem or idea. It structures scope, goals, exclusions, success measures, and acceptance checks.

In plain words
What is it for?
Use it to define a feature, set boundaries, document acceptance criteria, or divide a larger request into planned phases.
Why use it?
It turns an unclear request into an agreed description of what should be built and how completion will be judged.

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/joosure/maestro/write-spec
Any agent
npx skills add joosure/Maestro --skill write-spec
Clone the repo
git clone --depth 1 https://github.com/joosure/Maestro

Made for: Claude Code, Codex.

Per session 60 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,741 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00060 $0.02741
Opus 5 $0.00030 $0.01371
Sonnet 5 $0.00012 $0.00548
Haiku 4.5 $0.00006 $0.00274

Measured 2d ago against content hash 08570e8337e7, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

write-spec 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 2d 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.

.codex/skills/write-spec/SKILL.md · 251 lines

The source is not reproduced here

Licensed AGPL-3.0

The repository is licensed AGPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

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. 2d ago First seen · 251 lines · 60 tokens per session scan A 08570e8337e7

Subscribe to this mod's changes

write-spec is a skill published in the GitHub repository joosure/Maestro (45 stars, last pushed 1mo ago), licensed AGPL-3.0. It adds 60 tokens to every session and 2,741 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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