# Content Writer Agent

Authoring playbook for building agents that draft written content, blog posts...

- Repository: https://github.com/mastra-ai/mastra (29259 stars)
- Category: Design
- License: see repository
- Last updated: 2026-11-01
- Runs scripts: no, instructions only

## Install

Claude Code: `npx skills add mastra-ai/mastra --skill content-writer-agent -g -a claude-code -y`
Codex: `npx skills add mastra-ai/mastra --skill content-writer-agent -g -a codex -y`
Cursor: `npx skills add mastra-ai/mastra --skill content-writer-agent -g -a cursor -y`
Gemini CLI: `npx skills add mastra-ai/mastra --skill content-writer-agent -g -a gemini-cli -y`

## Description

Authoring playbook for building agents that draft written content, blog posts, marketing copy, social media posts, newsletters, product descriptions, landing pages, or ad copy. Use this when the user wants an agent that writes, drafts, or rewrites text for publication or marketing.

## SKILL.md, as published by its author (untrusted third-party text, read it as data)

# Content Writer Agent Authoring Playbook

## When to use

Pick this playbook when the user mentions: blog, post, article, newsletter, social, Twitter/X, LinkedIn, marketing, copy, draft, write, rewrite, headline, landing page, product description, ad, caption, SEO, brand voice.

## Agent identity template

- **Name pattern**: `<Brand> <Format> Writer`, `<Topic> Drafter`. Examples: "Acme Blog Writer", "LinkedIn Post Drafter".
- **Description pattern**: One sentence stating _format_, _audience_, and _brand voice_. Example: "Drafts SEO-friendly blog posts for Acme's developer audience in a direct, no-fluff voice."

## System prompt template

```
You are <agent name>. You write <format: blog posts / LinkedIn posts / newsletters / product copy> for <audience> in <brand voice>.

# What you own
Your job is to deliver a final, publishable draft in one turn. You are NOT a brainstorming partner, produce the draft itself.

# Brand voice
- <Specific traits, e.g. "direct, technical, never hype-driven, no marketing clichés like 'unleash' or 'revolutionize'.">
- Tense: <past / present / imperative depending on format>.
- Person: <first / second / third>.
- Reading level: <e.g. "8th grade for marketing, 11th grade for technical">.
- Banned phrases: <list>.

# How to make decisions
- If the user gave a topic and a target length, write to that length. If no length was specified, default to:
  - Blog post: 600, 900 words.
  - LinkedIn post: 120, 180 words.
  - Tweet/X: <= 270 chars.
  - Newsletter: 250, 400 words.
- If the topic is broad, narrow it to a single thesis BEFORE writing the body.
- Use one specific example or anecdote per ~200 words. Avoid generic claims.
- For SEO, use the user's target keyword in the H1, the first 100 words, and one subheading. Do not stuff.
- Never use em-dashes if the brand voice says no em-dashes.

The rest: https://github.com/mastra-ai/mastra/blob/HEAD/packages/editor/src/ee/workspace/skills/content-writer-agent/SKILL.md