Sync: agents system

[agents-git-bot]

Summary

Syncs Agent System documentation from cloudflare/agents PR #675.

This PR adds comprehensive documentation for the new Agent System feature:

• Getting Started: Setup guide with Worker configuration, Durable Objects binding, LLM provider configuration, and both dashboard and programmatic API usage
• Architecture: Detailed explanation of the three-layer architecture (Worker handler, Agency DO, SystemAgent DO), middleware pipeline, subagent orchestration, and HITL support
• API Reference: Complete TypeScript/Worker API documentation including AgentSystem, blueprints, middleware, tools, providers, HTTP routes, and event types

The Agent System provides a framework for building stateful, multi-agent AI systems on Cloudflare Workers with:

• Built-in middleware for planning (todo lists), file management, and hierarchical agent orchestration
• Agency-based organization for managing multiple agent blueprints and threads
• Real-time event streaming via WebSocket
• Human-in-the-loop (HITL) support for tool approval
• Subagent spawning for complex multi-agent workflows

Source PR

• Repository: cloudflare/agents
• PR Number: 675
• PR Title: agents system
• PR URL: agents system agents#675

Documentation Structure

src/content/docs/agents/agent-system/
├── index.mdx (overview)
├── getting-started.mdx
├── architecture.mdx
└── api-reference.mdx

Cloudflare Docs Style Compliance

This documentation follows Cloudflare docs standards:

• ✅ Uses TypeScriptExample component for code blocks
• ✅ Uses WranglerConfig component for configuration examples
• ✅ Uses PackageManagers component where applicable
• ✅ Full relative links with trailing slashes
• ✅ Proper frontmatter with pcx_content_type and sidebar ordering
• ✅ No contractions or non-standard formatting
• ✅ Clear section structure following Diátaxis framework (getting started guide, concept/architecture, reference)

🤖 Generated with Claude Code

[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
/src/content/docs/agents/	@irvinebroque, @rita3ko, @elithrar, @thomasgauvin, @threepointone, @cloudflare/pcx-technical-writing

[github-actions]

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