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Origin trial

By Belgravia Labs Standards Observatory · Last verified · 2 primary sources

An origin trial is Chrome's mechanism for shipping an experimental web-platform feature to real sites for a limited time before deciding whether to ship it broadly: a developer registers a specific origin, receives a token, and includes that token as a meta tag or HTTP header so the feature activates for visitors to that origin without requiring them to flip browser flags. In the agentic web (Step 5, Act), also known as Chrome origin trial, it is implemented or referenced by WebMCP.

Act An origin trial is Chrome's mechanism for shipping an experimental web-platform feature to real sites for a limited time before deciding whether to ship it broadly: a developer registers a specific origin, receives a token, and includes that token as a meta tag or HTTP header so the feature activates for visitors to that origin without requiring them to flip browser flags. Trials are time-limited, usage-limited, and feed feedback back to the Chrome team; some ("deprecation trials") instead let a site keep a feature that has been removed elsewhere a little longer. Firefox and Edge run comparable programmes. WebMCP, which lets a page register tools an agent embedded in the browser can call, entered a Chrome 149 origin trial announced 9 June 2026, meaning any exposure to it today is experimental and origin-scoped rather than a shipped, universally available API. Used by: webmcp.

Overview

An origin trial is Chrome's mechanism for shipping an experimental web-platform feature to real sites for a limited time before deciding whether to ship it broadly: a developer registers a specific origin, receives a token, and includes that token as a meta tag or HTTP header so the feature activates for visitors to that origin without requiring them to flip browser flags. In the agentic web (Step 5, Act), also known as Chrome origin trial, it is implemented or referenced by WebMCP.

Instances

Direct protocol probe: Not applicable (general term). Verified implementations across related standards:

Every instance with its source is listed on the instances page.

See also

References

  1. https://developer.chrome.com/docs/web-platform/origin-trials (2026-09-05) VERIFIED
  2. https://developer.chrome.com/blog/ai-webmcp-origin-trial (2026-06-09) VERIFIED

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Frequently asked questions

What is Origin trial?
An origin trial is Chrome's mechanism for shipping an experimental web-platform feature to real sites for a limited time before deciding whether to ship it broadly: a developer registers a specific origin, receives a token, and includes that token as a meta tag or HTTP header so the feature activates for visitors to that origin without requiring them to flip browser flags. In the agentic web (Step 5, Act), also known as Chrome origin trial, it is implemented or referenced by WebMCP.
Which agentic web standards use Origin trial?
Origin trial is used or referenced by WebMCP. See https://agenticweb.wiki/terms/origin-trial/ for sourced definitions and verified implementations.
How is Origin trial verified on agenticweb.wiki?
The Origin trial record cites 2 primary specification or implementation sources and was last verified on 2026-10-30.