# assistant-ui — WebMCP observations

Canonical: https://www.lazyweb.com/directory/webmcp/accelerators-2026-09-20/yc-30355
Updated: 2026-09-20

Native WebMCP census · September 20, 2026

Tools observed on the website listed for assistant-ui, with default and experimental browser contexts shown separately.

- Roster identity: assistant-ui · yc:30355
- Program and cohort: 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

## Observation windows

The experimental mode enabled WebMCP and WebMCPTesting. Both modes used fresh logged-out contexts and a 1.5-second settled observation window.

| Context | Result | Final URL | Start | End |
| --- | --- | --- | --- | --- |
| Default Chrome | Registration observed | https://www.assistant-ui.com/ | 2026-09-20 21:22 UTC | 2026-09-20 21:22 UTC |
| Experimental features enabled | Registration observed | https://www.assistant-ui.com/ | 2026-09-20 21:45 UTC | 2026-09-20 21:45 UTC |

## Exact tool names

| Name | Default | Experimental |
| --- | --- | --- |
| `getDoc` | Observed | Observed |
| `getExample` | Observed | Observed |
| `getSkill` | Observed | Observed |
| `listSkills` | Observed | Observed |
| `searchDocs` | Observed | Observed |

## Evidence limits

Passive homepage observation only. No tool was invoked. Registration does not establish execution, product quality, task success or adoption. A tool absent from one window may appear in another context.

Names and metadata describe exposed interfaces. They do not prove that a tool performs the named action or belongs to the company’s core product rather than a hosting platform.

- Default Chrome: source hash `1e0d6e5e2ac27b1a3b57f05b942cb5b4851a717673a3c698b81c5518b0d6b8d4`; tool frame origins: https://www.assistant-ui.com
- Experimental features enabled: source hash `04fbb466bafd96cd3baeedfcb4a8fa018363bae9b5f3a555ff58c497659183f2`; tool frame origins: https://www.assistant-ui.com

[Census directory](https://www.lazyweb.com/directory/webmcp/accelerators-2026-09-20) · [Study and methods](https://www.lazyweb.com/agent-readiness/measure-agent-distribution-without-counting-registrations) · [All row-level data](https://www.lazyweb.com/datasets/native-webmcp-census-2026-09-20.json) · [Archived WebMCP directory](https://www.lazyweb.com/webmcp)