M365 Agent Developer

This comprehensive skill provides expert guidance on the Microsoft 365 Copilot agent development lifecycle: from architectural design through TypeSpec implementation to deployment and publishing using the Agents Toolkit (ATK) CLI.

⚠️ For creating new projects, use the m365-agent-scaffolder skill first ⚠️

🚨 CRITICAL DEPLOYMENT RULE 🚨 When using this skill to make edits to an agent, you MUST ALWAYS deploy the agent using atk provision before returning to the user. This ensures changes are immediately reflected in M365 Copilot. Never return to the user with undeployed changes.

When to Use This Skill

Use this skill when:

• Designing the architecture for a new M365 Copilot agent
• Implementing TypeSpec code for agent capabilities and API plugins
• Configuring agent instructions and conversation starters
• Provisioning and deploying agents using ATK CLI
• Managing agent lifecycle across environments (dev, staging, production)