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This allows developers to mark specific tools as being intended for agents controlled by developers to debug the application. See: https://groups.google.com/a/chromium.org/g/chrome-ai-dev-preview/c/8tQWCpY6gVA/m/nNy_31okEgAJ.
UI forms are necessarily for end users and not fit for debugging use cases. There might be some developer-only panels which include signal forms where this annotation might be appropriate, but we're keeping it simple for now and can expand if/when such use cases arise. See: https://groups.google.com/a/chromium.org/g/chrome-ai-dev-preview/c/8tQWCpY6gVA/m/nNy_31okEgAJ
dgp1130
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JeanMeche
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Oct 1, 2026
dgp1130
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action: merge
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WebMCP introduced a new
debuggingannotation: https://groups.google.com/a/chromium.org/g/chrome-ai-dev-preview/c/8tQWCpY6gVA/m/nNy_31okEgAJThis PR exposes the option to
declareExperimentalWebMcpTool. It also hard-codesdebugging: falsefor signal forms tools under the assumption that all UI forms are intended for end users. That probably isn't 100% true, but I'd rather not expose this option until developers signal an interest in it.Existing Angular Chrome DevTools for Agents third party tools are unaffected and not in scope for using this annotation, as they are not implemented with WebMCP. We're talking with Chrome DevTools about potentially moving that direction, but this annotation is not sufficient as-is. The tools we have now require passing serializable references like DOM elements and JS objects which WebMCP does not currently support.