Mastra

Mastra Framework Guide

Build AI applications with Mastra. This skill teaches you how to find current documentation and build agents and workflows.

⚠️ Critical: Do not trust internal knowledge

Everything you know about Mastra is likely outdated or wrong. Never rely on memory. Always verify against current documentation.

Your training data contains obsolete APIs, deprecated patterns, and incorrect usage. Mastra evolves rapidly - APIs change between versions, constructor signatures shift, and patterns get refactored.

Prerequisites

Before writing any Mastra code, check if packages are installed:

ls node_modules/@mastra/

• If packages exist: Use embedded docs first (most reliable)
• If no packages: Install first or use remote docs

Documentation lookup guide

Quick Reference

| User Question | First Check | How To | | ----------------------------------- | ---------------------------------------------------------------- | ---------------------------------------------- | | "Create/install Mastra project" | [references/create-mastra.md](references/create-mastra.md) | Setup guide with CLI and manual steps | | "How do I use Agent/Workflow/Tool?" | [references/embedded-docs.md](references/embedded-docs.md) | Look up in node_modules/@mastra/*/dist/docs/ | | "How do I use X?" (no packages) | [references/remote-docs.md](references/remote-docs.md) | Fetch from https://mastra.ai/llms.txt | | "I'm getting an error..." | [references/common-errors.md](references/common-errors.md) | Common errors and solutions | | "Upgrade from v0.x to v1.x" | [references/migration-guide.md](references/migration-guide.md) | Version upgrade workflows |

Priority order for writing code

⚠️ Never write code without checking current docs first

1. Embedded docs first (if packages installed)

```bash # Check what's available cat nodemodules/@mastra/core/dist/docs/SOURCEMAP.json | grep '"Agent"'

# Read the actual type definition cat node_modules/@mastra/core/dist/[path-from-source-map] ```

• Why: Matches your EXACT installed version
• Most reliable source of truth
• See: [references/embedded-docs.md](references/embedded-docs.md)

1. Remote docs second (if packages not installed)

``bash # Fetch latest docs # https://mastra.ai/llms.txt ``

• Why: Latest published docs (may be ahead of installed version)
• Use when: Packages not installed or exploring new features
• See: [references/remote-docs.md](references/remote-docs.md)

Core concepts

Agents vs workflows

Agent: Autonomous, makes decisions, uses tools Use for: Open-ended tasks (support, research, analysis)

Workflow: Structured sequence of steps Use for: Defined processes (pipelines, approvals, ETL)

Key components

• Tools: Extend agent capabilities (APIs, databases, external services)
• Memory: Maintain context (message history, working memory, semantic recall)
• RAG: Query external knowledge (vector stores, graph relationships)
• Storage: Persist data (Postgres, LibSQL, MongoDB)

Critical requirements

TypeScript config

Mastra requires ES2022 modules. CommonJS will fail.

{
  "compilerOptions": {
    "target": "ES2022",
    "module": "ES2022",
    "moduleResolution": "bundler"
  }
}

Model format

Always use "provider/model-name":

• "openai/gpt-4o"
• "anthropic/claude-3-5-sonnet-20241022"
• "google/gemini-2.5-pro"

When you see errors

Type errors often mean your knowledge is outdated.

Common signs of outdated knowledge:

• Property X does not exist on type Y
• Cannot find module
• Type mismatch errors
• Constructor parameter errors

What to do:

1. Check [references/common-errors.md](references/common-errors.md)
2. Verify current API in embedded docs
3. Don't assume the error is a user mistake - it might be your outdated knowledge

Development workflow

Always verify before writing code:

1. Check packages installed

``bash ls node_modules/@mastra/ ``

1. Look up current API

• If installed → Use embedded docs [references/embedded-docs.md](references/embedded-docs.md)
• If not → Use remote docs [references/remote-docs.md](references/remote-docs.md)

1. Write code based on current docs

1. Test in Studio

``bash npm run dev # http://localhost:4111 ``

Resources

• Setup: [references/create-mastra.md](references/create-mastra.md)
• Embedded docs lookup: [references/embedded-docs.md](references/embedded-docs.md) - Start here if packages are installed
• Remote docs lookup: [references/remote-docs.md](references/remote-docs.md)
• Common errors: [references/common-errors.md](references/common-errors.md)
• Migrations: [references/migration-guide.md](references/migration-guide.md)
• Official site: https://mastra.ai (verify against embedded docs first)

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: Array-Ventures
• Source: Array-Ventures/coworker
• License: Apache-2.0
• Homepage: https://railway.com/deploy/coworker

Install and usage instructions live in the source repository linked above.