Cursor opens the Agent SDK it uses to build Bugbot and Security Reviewer
Cursor released the Agent SDK, the framework it uses to build its own managed agents like Bugbot, Security Reviewer, and Rollouts. Agents are defined as code: prompts in Markdown, tools as TypeScript functions, all version-controlled and reviewed like any project. A single `agent-sdk deploy` command ships them to Cursor's infrastructure, or they can run as a Node process in a container. Built-in evals and event replay let teams iterate quickly; one Cursor team built a knowledge-base reviewer in about a day.
The most useful agents are tailored to how a particular team operates. Until now, building one has generally meant adopting a product designed around someone else's workflow or starting from scratch.
- gawacer
We’ve officially hit the JS framework churn phase of AI tooling.
- h0rv
Why would you not use an open-source harness in October 2026? I am generally curious - what is the alpha?
- fallks
What about an AgentFactoryFactory? That would increase Cursor's valuation from $60 to $120 billion.
- scosman
Open AI and Anthropic already have "Agent SDK" brands. Vercel is "AI SDK". I wish folks would come up with some good names for new projects.
- asdev
Does anyone even use Cursor still? I loved it during the tab era but ever since they tried to catch up to agentic workflows, the product experience got worse and worse
- outlore
I’ve been using Vercel’s Eve it’s really lovely for an agent that lives on a server somewhere (no affiliation)
- docheinestages
In 2026, the wheel that keeps getting reinvented is the agent harness.
- thedangler
If you are on onstagram 99% of posts are people shilling skills where you need to subscribe to some service. To which they are an affiliate.
And a lot of the apps are the same thing.
It's going to be a race to the bottom.