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Agents Overview for Microsoft 365 Copilot
Microsoft Learn April 23, 2026
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Developer documentation on building and extending agents for M365 Copilot including declarative and custom agents.
Agent Definition
Developer-focused documentation on agent architecture, declarative agents, custom agent development, API integration, and publishing to the M365 ecosystem.
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View alli18n
Localization Agent
Implements internationalization (i18n) systematically across the application. Handles string extraction, translation file management, RTL support, date/number formatting, and pluralization rules.
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Awesome Copilotplanning
Implementation Planner Agent
Creates detailed implementation plans in markdown format using only read and search tools. Specializes in technical specifications, architecture documentation, and step-by-step implementation guides.
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GitHub Docsdebugging
Debugger Agent
Root-cause analysis specialist that systematically diagnoses bugs using stack trace analysis, data flow tracing, hypothesis testing, and minimal reproduction strategies.
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Awesome Copilotformatting
Strict Formatter Agent with Hooks
An agent that auto-formats code after every edit using configurable hooks. Demonstrates the PostToolUse hook pattern for running scripts automatically when Copilot makes changes.
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VS Code Docsperformance
Performance Investigator Agent
Diagnoses frontend performance issues including Core Web Vitals (LCP, CLS, INP), bundle size analysis, render performance, and runtime profiling. Provides actionable optimization recommendations.
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Awesome Copilotmeta-agent
Custom Agent Foundry
A meta-agent that helps you design and create new custom agents for VS Code. Generates .agent.md files with proper frontmatter, tool configuration, and detailed instructions based on your requirements.
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Awesome Copilot