---
title: "Write Spec - Air Market"
description: "Somebody asked for a feature and all you have is a sentence. This turns that into a structured document - what it is for, what it is not, how you will know it worked. Reach for it when an idea needs…"
canonical: "https://airmarket.ai/app/write-spec"
---

[Air Market](/) / [Writing](/category/writing) / Write Spec

Skill by [Anthropic](/@anthropics)

# Write Spec

Turn a vague feature idea into a document people can build from

## What this does

Somebody asked for a feature and all you have is a sentence. This turns that into a structured document - what it is for, what it is not, how you will know it worked. Reach for it when an idea needs to become something a team can actually read and build against.

### Top 3 things it does for you

- Turn a rough idea into a spec
- Set the goals and non-goals
- Define success metrics and acceptance criteria

## Information

**Write Spec at a glance**

|  |  |
| --- | --- |
| Kind | Skill |
| Publisher | [Anthropic](/@anthropics) |
| Category | [Writing](/category/writing) |
| Works with | Agent Skills - an open standard supported by 40+ agents |
| Size | 12 KB |
| Licence | Apache-2.0 |
| Repository | [anthropics/knowledge-work-plugins](https://github.com/anthropics/knowledge-work-plugins/tree/9789ea78ad66e395a9c709146cacecdc14ce2abf/product-management/skills/write-spec) |
| GitHub stars | 23,642 (as of Nov 2026) |
| Installs | 3,723, counted by skills.sh (Nov 2026) |

## Security report

**Verified.** AIR scanned this exact version of Write Spec and flagged nothing. AIR's verdict: **safe**.

**What Write Spec's check was run against**

|  |  |
| --- | --- |
| Commit | 9789ea78ad66e395a9c709146cacecdc14ce2abf |
| Content hash | 0d7fc73a7d813e96f795968632d9f5aacef7c4c910acdf70471249787d19282c |
| Files read | [Browse the files at this exact commit](https://github.com/anthropics/knowledge-work-plugins/blob/9789ea78ad66e395a9c709146cacecdc14ce2abf/product-management/skills/write-spec/SKILL.md) |

A scan is named by the exact content it read, not by a version number. A different version is a different artifact, and nothing here applies to a version AIR has not scanned.

[Read the full security report for Write Spec](/security/write-spec)

## About Write Spec

Takes a problem statement or a feature idea and writes the spec or PRD from it.

Use it when a vague idea or a user request needs to become a structured document, when you are scoping a feature and want the goals and non-goals stated, when you need success metrics and acceptance criteria defined, or when a big ask has to be broken into a phased spec.

## What's inside

- SKILL.md - instructions

## Questions

### Is Write Spec safe to install?

AIR scanned this exact version of Write Spec and flagged nothing. AIR's verdict: safe. The verdict is named by the content that was read, at commit 9789ea78ad66, so it cannot drift onto a version nobody scanned. The full report is at https://airmarket.ai/security/write-spec.

### How do I install Write Spec?

Open https://airmarket.ai/app/write-spec on Air Market and use the install action: Air Market hands Claude a prompt naming this exact skill, and Claude sets it up. Source, pinned to the exact commit this listing describes: https://github.com/anthropics/knowledge-work-plugins/tree/9789ea78ad66e395a9c709146cacecdc14ce2abf/product-management/skills/write-spec. Install from that link, not the branch.

## Related on Air Market

- [More Writing listings](/category/writing)
- [Everything by Anthropic](/@anthropics)

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Canonical URL: <https://airmarket.ai/app/write-spec>