nowfound

AI · August 14, 2026

Substructure

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…

Substructure launched on August 14, 2026 with 3 votes, #2,940 of 23,274 launches that month and more than 50% of that year's launches.

What it does

Substructure runs AI agents in the cloud instead of on someone's laptop. Write a TOML file, run subs apply, and you have a Slack agent connected to MCP servers your team uses. Override any step of the agent loop with a webhook into your own system. Self-host it or let us run it.

subs is an agent harness for the cloud. It runs an unprivileged agent loop with no system access. It uses MCP servers for tools. It can run locally or as a client and server.

In the maker’s words, at launch

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…

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