---
type: Glossary Term
title: "Origin trial"
description: "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."
resource: "https://agenticweb.wiki/terms/origin-trial/"
tags: ["glossary", "act"]
status: stable
generated: { by: agenticweb-builder/1.0, at: 2026-10-30T00:00:00Z }
verified: { by: process:agenticweb-engine, at: 2026-10-30T00:00:00Z }
stale_after: 2026-11-29T00:00:00Z
sources:
  - id: ref-1
    resource: "https://developer.chrome.com/docs/web-platform/origin-trials"
    last_modified: 2026-09-05T00:00:00Z
  - id: ref-2
    resource: "https://developer.chrome.com/blog/ai-webmcp-origin-trial"
    last_modified: 2026-06-09T00:00:00Z
---

# 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. 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.

# Knowledge Graph

* **Related standards**: [WebMCP](/okf/protocols/webmcp.md)

[^ref-1]: https://developer.chrome.com/docs/web-platform/origin-trials (https://developer.chrome.com/docs/web-platform/origin-trials)
[^ref-2]: https://developer.chrome.com/blog/ai-webmcp-origin-trial (https://developer.chrome.com/blog/ai-webmcp-origin-trial)