WebMCP: add streamed tool primitives [chromium/src : main]

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Mark Foltz (Gerrit)

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Mar 11, 2026, 11:40:00 AM (2 days ago) Mar 11

to Alex Nahas, Mark Foltz, chromium...@chromium.org, Kentaro Hara, Khushal Sagar, Raphael Kubo da Costa, aleventh...@chromium.org, blink-re...@chromium.org, blink-revie...@chromium.org, blink-...@chromium.org, ipc-securi...@chromium.org, jmedle...@chromium.org, kinuko...@chromium.org, mfoltz+wa...@chromium.org, mfoltz+wa...@chromium.org

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Mark Foltz added 1 comment

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Mark Foltz . resolved

Hello Alex,

Thank you very much for taking the time to contribute to Blink's implementation of WebMCP. It looks like this was inspired by the GitHub issue https://github.com/webmachinelearning/webmcp/issues/82.

However, neither Chrome nor any other browser vendor has taken the time to weigh in on whether to incorporate this into the WebMCP API. And to be honest, we have not had time to evaluate this problem area ourselves. Until the group has reached a consensus on this, it's unlikely that we will prioritize reviewing this change.

Probably the best step to move this forward is to ping the GH issue and get it on the group agenda for the next call.

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Alex Nahas (Gerrit)

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Mar 11, 2026, 12:57:48 PM (2 days ago) Mar 11

to Dominic Farolino, Mark Foltz, chromium...@chromium.org, Kentaro Hara, Khushal Sagar, Raphael Kubo da Costa, aleventh...@chromium.org, blink-re...@chromium.org, blink-revie...@chromium.org, blink-...@chromium.org, ipc-securi...@chromium.org, jmedle...@chromium.org, kinuko...@chromium.org, mfoltz+wa...@chromium.org, mfoltz+wa...@chromium.org

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Alex Nahas added 1 comment

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File-level comment, Patchset 3 (Latest):

Mark Foltz . resolved

Hello Alex,
Thank you very much for taking the time to contribute to Blink's implementation of WebMCP. It looks like this was inspired by the GitHub issue https://github.com/webmachinelearning/webmcp/issues/82.
However, neither Chrome nor any other browser vendor has taken the time to weigh in on whether to incorporate this into the WebMCP API. And to be honest, we have not had time to evaluate this problem area ourselves. Until the group has reached a consensus on this, it's unlikely that we will prioritize reviewing this change.
Probably the best step to move this forward is to ping the GH issue and get it on the group agenda for the next call.

Alex Nahas

Hey Mark,

Thanks for the note. That makes sense, and I had no expectation that Chromium would review this before the group had discussed the proposal more.

Yeah, this came out of issue #82, which I filed. The video there shows an end-product example using this streaming API. I put the implementation together mainly as a concrete reference point for the discussion. I come from the MCP world, where working implementations are required before proposals are considered.

I’ll follow up and ask to get it onto the agenda for an upcoming call.

Cheers,
Alex