# Button Computer — WebMCP observations

Canonical: https://www.lazyweb.com/directory/webmcp/accelerators-2026-09-20/yc-30770
Updated: 2026-09-20

Native WebMCP census · September 20, 2026

Tools observed on the website listed for Button Computer, with default and experimental browser contexts shown separately.

- Roster identity: Button Computer · yc:30770
- Program and cohort: Y Combinator · Winter 2026
- Roster observed: 2026-09-18
- Official profile: <https://www.ycombinator.com/companies/button-computer>
- Listed website: <https://buttoncomputer.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://buttoncomputer.com/ | 2026-09-20 21:22 UTC | 2026-09-20 21:22 UTC |
| Experimental features enabled | Registration observed | https://buttoncomputer.com/ | 2026-09-20 21:46 UTC | 2026-09-20 21:46 UTC |

## Exact tool names

| Name | Default | Experimental |
| --- | --- | --- |
| `browse_store` | Observed | Observed |
| `cancel_cart` | Observed | Observed |
| `get_cart` | Observed | Observed |
| `get_product` | Observed | Observed |
| `manage_orders` | Observed | Observed |
| `proceed_to_checkout` | Observed | Observed |
| `search_catalog` | Observed | Observed |
| `search_shop_policies_and_faqs` | Observed | Observed |
| `show_variant` | Observed | Observed |
| `update_cart` | 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 `0f4a192fad2aa765733aeb6b2a743fc40e9f1018dcddaac605a9a041d7e0d168`; tool frame origins: https://buttoncomputer.com
- Experimental features enabled: source hash `39cb8715ddc66f4a8989387aa3a0804b49ca9f02c8b96305d4afd3223c058380`; tool frame origins: https://buttoncomputer.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)