WebMCP: bridge streamed executeTool() inputs across worlds [chromium/src : main]

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Alex Nahas (Gerrit)

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Mar 10, 2026, 10:21:53 PM (2 days ago) Mar 10

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

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WebMCP: bridge streamed executeTool() inputs across worlds

This CL fixes the cross-world streamed executeTool() path.

The streamed testing overload can receive chunks and args in one
ScriptState and invoke the tool in another. Before this change, the
caller-world ReadableStream, args promise, and pre-abort reason could
reach the tool callback world directly. This CL bridges those values into
the callback-relevant ScriptState before StreamedToolCall or PromiseAll
sees them.

Same-world execution stays on the existing fast path. Declarative tools
and the non-streamed string path are unchanged.

Change-Id: I2a3bd5d5730aa311624e02589b511887a568aecf

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Change information

Files:

M third_party/blink/renderer/core/script_tools/model_context.cc
M third_party/blink/renderer/core/script_tools/model_context.h
M third_party/blink/renderer/core/script_tools/model_context_test.cc
M third_party/blink/renderer/core/script_tools/model_context_testing.cc
M third_party/blink/web_tests/fast/webmcp/streaming_tools-expected.txt
M third_party/blink/web_tests/fast/webmcp/streaming_tools.html

Change size: XL

Delta: 6 files changed, 1066 insertions(+), 86 deletions(-)

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Alex Nahas (Gerrit)

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Mar 10, 2026, 11:59:39 PM (2 days ago) Mar 10

to 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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Superseded by the smaller 5-CL restack that splits the cross-world work into separate value-bridging and stream-relay CLs.

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