# Substructure

Startup, Worldwide.

> An agent engine with no SDK, just TOML and webhooks
>
> — in its own words, from substructure.ai

- Website: https://substructure.ai/
- Listed since: 2026
- launched: 2026-08-13
- launch post: https://news.ycombinator.com/item?id=49286364
- hn score: 2
- domain created: 2023-06-08
- Last verified: 2026-08-13


## Sources

- Hacker News, "Show HN" — https://news.ycombinator.com/item?id=49286364, read 2026-08-13

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startup.is · https://startup.is/registry/substructure · open data: /api/v1, /llms.txt