# assistant-ui — WebMCP observations

Canonical: https://mudpie.ai/directory/webmcp/accelerators-2026-09-20/yc-30355/

- Roster: Y Combinator / Winter 2025
- Roster observed: 2026-09-18
- Official profile: <https://www.ycombinator.com/companies/assistant-ui>
- Listed website: <https://assistant-ui.com>
- Browser: 153.0.8010.50

## Default Chrome

Registration observed. Final URL: <https://www.assistant-ui.com/>

Window: 2026-09-20T21:22:00.664Z to 2026-09-20T21:22:02.570Z.

Tools: getDoc, getExample, getSkill, listSkills, searchDocs.

Source SHA-256: 1e0d6e5e2ac27b1a3b57f05b942cb5b4851a717673a3c698b81c5518b0d6b8d4

## Experimental features enabled

Registration observed. Final URL: <https://www.assistant-ui.com/>

Window: 2026-09-20T21:45:40.384Z to 2026-09-20T21:45:42.309Z.

Tools: getDoc, getExample, getSkill, listSkills, searchDocs.

Source SHA-256: 04fbb466bafd96cd3baeedfcb4a8fa018363bae9b5f3a555ff58c497659183f2

## Limits

No tool was invoked. Registration does not establish execution, product quality, task success or adoption. Absence in one window is not website-wide absence.

[Study and methods](https://mudpie.ai/agent-readiness/measure-agent-distribution-without-counting-registrations/) · [Full dataset](https://mudpie.ai/research/native-webmcp-census-2026-09-20.json) · [Census directory](https://mudpie.ai/directory/webmcp/accelerators-2026-09-20/)