Show HN: An agent engine with no SDK, just TOML and webhooks

Substructure is an engine for agents that live in the cloud instead of a laptop. Connect them to Slack, give them MCPs, build tools inside your own system. Customize the agent loop. Host it yourself, or let us run it.

2 points by xwil 70 days ago substructure.ai 0 comments

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I was looking for a way to add AI agents to multiple systems that I maintain.

I had a few requirements:

- I work in multiple programming languages, so it needs to work for all of them.

- I can control how tools access my system.

- I can override the agent loop to try different patterns.

- I can iterate on the loop without handling durability, streaming, and the rest of the nitty gritty.

- I can iterate locally before deploying.

- I can self host.

Nothing existed that worked across programming languages, so I built it.

It's not an SDK. It's a server that handles durability, streaming, MCP connections, LLM calls and connecting to channels like Slack.

You can override every single step of the agent loop by handling a webhook.

But you don't have to override anything, you don't even need to handle the webhook. You can define the agent in a TOML file and chat with your agent via Slack in minutes.

Point it at your backend to receive a webhook at every decision point. The engine sends the current step and a proposed next step. You can echo the proposal to do what the engine wants, or you can do something else and customize the agent loop.

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