Agent
The core of the agents library is the exported Agent class. Following the pattern from Durable Objects, the main API for developers is to extend the Agent so those classes inherit all the built-in features. While this effectively is a supercharged primitive that allows developers to only write the logic they need in…
Agent
Agent tools let one chat agent dispatch another chat-capable sub-agent as part of its work. The child is a real sub-agent with its own Durable Object storage, messages, tools, resumable stream, and drill-in URL. The parent keeps a small run registry so clients can render the child timeline, replay it after refresh…
Agent
Browser tools give your agents full access to the Chrome DevTools Protocol (CDP) through the code mode pattern. Instead of a fixed set of browser actions (click, screenshot, navigate), the LLM writes code that runs CDP commands against a live browser session — accessing all domains, commands, events, and types in the…
Agent
Callable methods let clients invoke agent methods over WebSocket using RPC (Remote Procedure Call). Mark methods with @callable() to expose them to external clients like browsers, mobile apps, or other services.
Agent
Build AI-powered chat interfaces with AIChatAgent and useAgentChat. Messages are automatically persisted to SQLite, streams resume on disconnect, and tool calls work across server and client.
Agent
Use agents/chat-sdk when you run the Chat SDK inside an Agent and want the Chat SDK StateAdapter to use Agents sub-agents for durable state.
Agent
Connect to agents from any JavaScript runtime — browsers, Node.js, Deno, Bun, or edge functions — using WebSockets or HTTP. The SDK provides real-time state synchronization, RPC method calls, and streaming responses.
Agent
Tools in AIChatAgent can be divided into two categories.
Agent
Codemode lets LLMs write and execute code that orchestrates your tools, instead of calling them one at a time. Inspired by CodeAct, it works because LLMs are better at writing code than making individual tool calls — they have seen millions of lines of real-world TypeScript but only contrived tool-calling examples.
Agent
This guide covers everything you need to configure agents for local development and production deployment, including wrangler.jsonc setup, type generation, environment variables, and the Cloudflare dashboard.
Agent
When your Agents are deployed, to keep things secure, send a token from the client, then verify it on the server. This mirrors the shape used in PartyKit’s auth guide.
Agent
Run work that survives Durable Object eviction. runFiber() registers a task in SQLite, keeps the agent alive during execution, lets you checkpoint intermediate state with stash(), and calls onFiberRecovered() on the next activation if the agent was evicted mid-task.
Agent
Agents can send and receive email with Cloudflare's Email Service. This guide shows how to send outbound email with the Workers binding, route inbound mail into Agents, and handle follow-up replies securely.
Agent
The framework detects and wraps custom Agent methods during initialization so getCurrentAgent() can resolve the active agent inside them and the functions they call.
Agent
Build AI agents that persist, think, and act. Agents run on Cloudflare's global network, maintain state across requests, and connect to clients in real-time via WebSockets.
Agent
Agents handle both HTTP requests and WebSocket connections, giving you flexibility to build REST APIs, real-time applications, or hybrid architectures.
Agent
Human-in-the-loop (HITL) patterns allow agents to pause execution and wait for human approval, confirmation, or input before proceeding. This is essential for compliance, safety, and oversight in agentic systems.
Agent
Build stateful AI agents on Cloudflare Workers. Every agent is a Durable Object — an addressable, hibernatable actor with its own SQLite database, WebSockets, and scheduling — so you can afford one durable agent per user, account, task, or conversation, with near-zero cost while idle.
Agent
Agent "lifecycle" from cloudflare/agents, covering durable object lifecycle, plain durable object, request call path, reusable capabilities and the job queue.
Agent
Build agents that persist for days, weeks, or months — surviving restarts, waking on demand, and managing work that spans far longer than any single request.
Agent
Connect your agent to external MCP (Model Context Protocol) servers to use their tools, resources, and prompts. This enables your agent to interact with GitHub, Slack, databases, and other services through a standardized protocol.
Agent
This guide covers the different ways to create MCP servers with the Agents SDK and helps you choose the right approach.
Agent
This guide explains the different transport options for connecting to MCP servers with the Agents SDK.
Agent
This guide covers the changes needed when upgrading from AI SDK v4 to v5 with @cloudflare/ai-chat.