Click launched on YC with a managed API for AI agents

A team that wants to put an AI agent in its product usually has to build two things. The agent, and the machine that runs it. Click, a Y Combinator Summer 2026 company, launched with an API that handles the machine. The founder, Aditya Asgaonkar, says Click gives you the entire agent stack over an API. The launch page had 2 votes at the time of writing.

What Click gives you

You start a session over the API. Click creates one with the pieces an agent needs: a sandbox, a browser, and web search. You bring your own model keys, so the API works with any model. You bring your own tools too, through MCP servers or custom application tools. You can send files and skills as context.

Click streams events and outputs back to your product as the agent runs. For background work, it can send a webhook when the task is done. The launch page says a session can run for as long as you want.

The post calls out two features that are not obvious. Deferred tool discovery lets a session hold thousands of tools without feeding every description to the model up front. Code Mode lets an agent use tools through short scripts. That keeps the token count down on long runs.

Why build it

Agents started as short loops around a model, Asgaonkar writes. They have grown into real software. Keeping that software up to date, and keeping the machines around it healthy, is a full-time engineering job. A team that only wants the agent inside its product pays for the stack, not for the product.

Click's answer is to run the stack for you. The company owns the sandbox, the browser, the harness, and the plumbing. You own the model, the tools, and the user. The parts that make a product yours stay with you. The parts that look the same at every company move to Click.

Who is building it

Asgaonkar helped build the distributed system behind Ethereum. That is a system where many computers have to agree on what happened. He has spent the past year building agent harnesses. In the launch post he says that is where Click came from. The company is live at useclick.ai and offers a free start. Click is listed under API, Cloud Computing, Infrastructure and AI on its YC page.

The pitch sits next to a crowded field. Anthropic has its own Managed Agents, OpenAI has an agents API, and open harnesses are easy to find. Click's angle is that it is model-agnostic by default. A team that does not want to pick one model can run its agent on Click and change keys later.

Source

• Click launch, Y Combinator