# primitive — WebMCP observations

Canonical: https://mudpie.ai/directory/webmcp/accelerators-2026-09-20/yc-31329/

- Roster: Y Combinator / Spring 2026
- Roster observed: 2026-09-18
- Official profile: <https://www.ycombinator.com/companies/primitive>
- Listed website: <https://primitive.dev>
- Browser: 153.0.8010.50

## Default Chrome

Not observed in this window. Final URL: <https://www.primitive.dev/>

Window: 2026-09-20T21:11:06.658Z to 2026-09-20T21:11:08.950Z.

Tools: Not observed in this window.

Source SHA-256: ed6437436d32f8660cf7dea9bcf438cd57ecb7bd9c4c6cc2d9fb94b8e9970398

## Experimental features enabled

Registration observed. Final URL: <https://www.primitive.dev/>

Window: 2026-09-20T21:35:06.598Z to 2026-09-20T21:35:08.721Z.

Tools: primitive\_overview, primitive\_quickstart.

Source SHA-256: 0f86691e7c79b5f3a1c82a78363f6680c54bc43e1f163e60e6d95e7ab3469c4d

## 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/)