Cursor releases the Agent SDK for defining and deploying agents as code

Cursor has released the Agent SDK, the internal framework that powers its own managed agents including Bugbot, Security Review, Approval Bot and Rollouts. Announced on the Cursor blog on 20 October 2026 and promoted to v0.3.0 general availability in the SDK changelog on 23 October 2026, the kit lets engineering teams build, test and version custom workflow agents inside standard source repositories.

Each Agent SDK project combines Markdown instruction files with deterministic TypeScript tool definitions, model routing rules and subagent handoffs. Agents subscribe to events across GitHub, GitLab, Bitbucket, Slack, Linear and Jira to automate tasks such as checking pull requests against an internal engineering knowledge base, routing high-risk diffs to owners or investigating production incidents. Built-in evaluation suites and event replay let developers test prompt or tool changes locally in a playground before shipping.

Once validated, teams can deploy an agent to Cursor-managed cloud infrastructure with a single agent-sdk deploy command, managing secrets, logs and MCP connections from the Deployed Agents dashboard, or package it as a single Node.js process (Node 22.13 or newer) inside their own container infrastructure. The launch blog imports defineAgent from @cursor/agent-sdk, whereas the official documentation instructs installing @grok/agent-sdk globally and notes the package was previously named @cursor/bdk.