Upgrading 

From 0.3 to 0.4 

Version 0.4 aligns the runtime with the WebMCP specification draft of 2026-10-02. Requirements are unchanged (TYPO3 14.3+, PHP 8.2+).

What changes 

  • Registration. The runtime no longer calls provideContext(), which the specification removed. Each tool is registered individually with registerTool() , so tools appear one after another instead of all at once. If one registration fails, only that tool is missing and the console shows one warning naming it.
  • Lifecycle. Tools are unregistered on pagehide and registered again when the page is restored from the back/forward cache.
  • Iframes. Tools are no longer registered when the page is embedded in an iframe.
  • Output cap. The text output of a tool call is limited to 1,500 characters by default.
  • New annotation. Every manifest now also carries annotations.consequentialHint (true for mailto).

Do I need to act? 

  • Tools built on the four primitives: no action required.
  • Escape-hatch modules that call provideContext() themselves: replace the call with one registerTool(tool, { signal }) per tool. provideContext() does not exist in current browsers.
  • Tools with long text output (large static lists, high search limits): check whether the output exceeds 1,500 characters. Shorten it or set outputLimit (0 disables the cap).
  • Embedded pages: if you relied on tools inside an iframe, that no longer works — agents do not discover tools in iframes anyway.
  • Check your log after the first page render: the data processor now warns about tool or parameter names over 30 characters and descriptions over the recommended sizes (see Writing tools).

New, optional settings