09Changelog

What changed, and when.

These protocols are young and moving fast. Updates and re-verification notes land here — subscribe via RSS.

  1. NLWeb WebMCP MCP A2A

    Reference page v0 — verified June 2026

    The reference is live. Every protocol claim — origins, runtime locations, and boundaries — was checked against the canonical docs on this date. The decision table is the page to bookmark.

    Next up: the demo repo that wires NLWeb and WebMCP into a single site, which backs the “Common pitfalls” section once the pitfalls have actually been hit.

  2. WebMCP

    WebMCP enters origin trial in Chrome 149

    WebMCP moved from independent library to a proposed W3C standard with Chrome implementing natively. The origin trial exposes two APIs:

    • Imperative — register tools in JavaScript via navigator.modelContext.
    • Declarative — annotate HTML forms so the agent can operate them directly.

    Access is gated by the tools Permissions Policy. Because it’s browser-only, agents must visit the page before they can use any of it — pair it with NLWeb if you also need to be discoverable.