Agents

The latest release of the Agents SDK exposes agent state as a readable property, prevents duplicate schedule rows across Durable Object restarts, brings full TypeScript inference to AgentClient, and migrates to Zod 4. Readable state on useAgent and AgentClient Both…

Sandboxes now support real-time filesystem watching via sandbox.watch(). The method returns a Server-Sent Events stream backed by native inotify, so your Worker receives create, modify, delete, and move events as they happen inside the container. sandbox.watch(path, options) Pass a directory…

The latest release of the Agents SDK rewrites observability from scratch with diagnostics_channel, adds keepAlive() to prevent Durable Object eviction during long-running work, and introduces waitForMcpConnections so MCP tools are always available when onChatMessage runs. Observability rewrite The previous observability…

The latest release of the Agents SDK lets you define an Agent and an McpAgent in the same Worker and connect them over RPC — no HTTP, no network overhead. It also makes OAuth opt-in for simple MCP connections, hardens…

The latest release of the Agents SDK brings readonly connections, MCP protocol and security improvements, x402 payment protocol v2 migration, and the ability to customize OAuth for MCP server connections. Readonly connections Agents can now restrict WebSocket clients to read-only…

Sandboxes now support createBackup() and restoreBackup() methods for creating and restoring point-in-time snapshots of directories. This allows you to restore environments quickly. For instance, in order to develop in a sandbox, you may need to include a user's codebase and…