Revert "[WebMCP] Expose RegisteredTool.inputSchema as an object" - #62111

[taskcluster 2026-08-21 11:45:19.663Z] Task ID: ZpzxjC8CTQanMIi2-G7rOg
[taskcluster 2026-08-21 11:45:19.663Z] Worker ID: 8435813357212501942
[taskcluster 2026-08-21 11:45:19.663Z] Worker Group: us-east1-b
[taskcluster 2026-08-21 11:45:19.663Z] Worker Node Type: projects/757942385826/machineTypes/n2-standard-4
[taskcluster 2026-08-21 11:45:19.663Z] Worker Pool: proj-wpt/ci
[taskcluster 2026-08-21 11:45:19.663Z] Worker Version: 46.1.0
[taskcluster 2026-08-21 11:45:19.663Z] Public IP: 34.24.98.218
[taskcluster 2026-08-21 11:45:19.663Z] Hostname: proj-wpt-ci-sfqakoimt0ge2-mvbavfiq

[taskcluster 2026-08-21 11:45:20.731Z] === Task Starting ===
+ '[' '' ']'
+ '[' -d /etc/profile.d ']'
+ for i in /etc/profile.d/*.sh
+ '[' -r /etc/profile.d/01-locale-fix.sh ']'
+ . /etc/profile.d/01-locale-fix.sh
+++ /usr/bin/locale-check C.UTF-8
++ eval
+ for i in /etc/profile.d/*.sh
+ '[' -r /etc/profile.d/apps-bin-path.sh ']'
+ . /etc/profile.d/apps-bin-path.sh

...(846 lines hidden)...

 2:25.76 pid:3335 [3713:3713:0821/114915.626077:WARNING:content/child/runtime_features.cc:529] SharedStorage cannot be enabled in this configuration. Use --enable-features=SharedStorageAPI in addition.
 2:25.77 pid:3335 [3713:3713:0821/114915.626568:WARNING:content/child/runtime_features.cc:539] AttributionReporting cannot be enabled in this configuration. Use --enable-features=ConversionMeasurement in addition.
 2:25.77 pid:3335 [3352:3352:0821/114915.641793:WARNING:ui/aura/window.cc:1456] StackChildLayerRelativeTo called with unmanaged layer(s). child=WebContentsViewAura child_managed=0 target=WebContentsViewAura target_managed=0
 2:25.77 pid:3335 [3352:3352:0821/114915.641967:WARNING:ui/aura/window.cc:1456] StackChildLayerRelativeTo called with unmanaged layer(s). child=WebContentsViewAura child_managed=0 target=WebContentsViewAura target_managed=0
 2:28.06 pid:3335 [3352:3369:0821/114917.934639:ERROR:google_apis/gcm/engine/registration_request.cc:291] Registration response error message: DEPRECATED_ENDPOINT
mem avail: 13818 of 15806 MiB (87.42%), swap free:    0 of    0 MiB ( 0.00%)
 2:50.05 pid:3335 [3352:3352:0821/114939.917470:WARNING:ui/aura/window.cc:1456] StackChildLayerRelativeTo called with unmanaged layer(s). child=WebContentsViewAura child_managed=0 target=WebContentsViewAura target_managed=0
 2:50.05 pid:3335 [3352:3352:0821/114939.917555:WARNING:ui/aura/window.cc:1456] StackChildLayerRelativeTo called with unmanaged layer(s). child=WebContentsViewAura child_managed=0 target=WebContentsViewAura target_managed=0
 2:50.10 TEST_END: Test OK. Subtests passed 4/4. Unexpected 0
 2:50.10 TEST_START: /webmcp/imperative/exposedTo-defaults-same-origin.https.html
 2:50.12 pid:3335 [3733:3733:0821/114939.994064:WARNING:content/child/runtime_features.cc:529] SharedStorage cannot be enabled in this configuration. Use --enable-features=SharedStorageAPI in addition.
 2:50.13 pid:3335 [3733:3733:0821/114939.994842:WARNING:content/child/runtime_features.cc:539] AttributionReporting cannot be enabled in this configuration. Use --enable-features=ConversionMeasurement in addition.
 2:50.14 pid:3335 [3352:3352:0821/114940.008506:WARNING:ui/aura/window.cc:1456] StackChildLayerRelativeTo called with unmanaged layer(s). child=WebContentsViewAura child_managed=0 target=WebContentsViewAura target_managed=0
 2:50.14 pid:3335 [3352:3352:0821/114940.008591:WARNING:ui/aura/window.cc:1456] StackChildLayerRelativeTo called with unmanaged layer(s). child=WebContentsViewAura child_managed=0 target=WebContentsViewAura target_managed=0
 2:50.41 pid:3335 [3352:3352:0821/114940.281984:WARNING:ui/aura/window.cc:1456] StackChildLayerRelativeTo called with unmanaged layer(s). child=WebContentsViewAura child_managed=0 target=WebContentsViewAura target_managed=0
 2:50.41 pid:3335 [3352:3352:0821/114940.282535:WARNING:ui/aura/window.cc:1456] StackChildLayerRelativeTo called with unmanaged layer(s). child=WebContentsViewAura child_managed=0 target=WebContentsViewAura target_managed=0
 2:50.47 TEST_END: Test OK. Subtests passed 4/4. Unexpected 0
 2:50.47 TEST_START: /webmcp/imperative/exposedTo-multiple-children.https.html
 2:50.52 pid:3335 [3752:3752:0821/114940.387384:WARNING:content/child/runtime_features.cc:529] SharedStorage cannot be enabled in this configuration. Use --enable-features=SharedStorageAPI in addition.
 2:50.52 pid:3335 [3752:3752:0821/114940.387496:WARNING:content/child/runtime_features.cc:539] AttributionReporting cannot be enabled in this configuration. Use --enable-features=ConversionMeasurement in addition.
 2:50.53 pid:3335 [3352:3352:0821/114940.397509:WARNING:ui/aura/window.cc:1456] StackChildLayerRelativeTo called with unmanaged layer(s). child=WebContentsViewAura child_managed=0 target=WebContentsViewAura target_managed=0
 2:50.53 pid:3335 [3352:3352:0821/114940.398093:WARNING:ui/aura/window.cc:1456] StackChildLayerRelativeTo called with unmanaged layer(s). child=WebContentsViewAura child_managed=0 target=WebContentsViewAura target_managed=0
 2:52.56 pid:3335 [3771:3771:0821/114942.426852:WARNING:content/child/runtime_features.cc:529] SharedStorage cannot be enabled in this configuration. Use --enable-features=SharedStorageAPI in addition.
 2:52.56 pid:3335 [3771:3771:0821/114942.426944:WARNING:content/child/runtime_features.cc:539] AttributionReporting cannot be enabled in this configuration. Use --enable-features=ConversionMeasurement in addition.
 2:54.78 pid:3335 [3352:3352:0821/114944.643693:WARNING:ui/aura/window.cc:1456] StackChildLayerRelativeTo called with unmanaged layer(s). child=WebContentsViewAura child_managed=0 target=WebContentsViewAura target_managed=0
 2:54.78 pid:3335 [3352:3352:0821/114944.643771:WARNING:ui/aura/window.cc:1456] StackChildLayerRelativeTo called with unmanaged layer(s). child=WebContentsViewAura child_managed=0 target=WebContentsViewAura target_managed=0
 2:54.83 TEST_END: Test OK. Subtests passed 1/1. Unexpected 0
 2:54.83 TEST_START: /webmcp/imperative/exposedTo-window-open.https.html
 2:54.85 pid:3335 [3784:3784:0821/114944.719263:WARNING:content/child/runtime_features.cc:529] SharedStorage cannot be enabled in this configuration. Use --enable-features=SharedStorageAPI in addition.
 2:54.85 pid:3335 [3784:3784:0821/114944.719409:WARNING:content/child/runtime_features.cc:539] AttributionReporting cannot be enabled in this configuration. Use --enable-features=ConversionMeasurement in addition.
 2:54.87 pid:3335 [3352:3352:0821/114944.743113:WARNING:ui/aura/window.cc:1456] StackChildLayerRelativeTo called with unmanaged layer(s). child=WebContentsViewAura child_managed=0 target=WebContentsViewAura target_managed=0
 2:54.87 pid:3335 [3352:3352:0821/114944.743209:WARNING:ui/aura/window.cc:1456] StackChildLayerRelativeTo called with unmanaged layer(s). child=WebContentsViewAura child_managed=0 target=WebContentsViewAura target_managed=0
 2:55.07 pid:3335 [3352:3352:0821/114944.937937:WARNING:ui/aura/window.cc:1456] StackChildLayerRelativeTo called with unmanaged layer(s). child=WebContentsViewAura child_managed=0 target=WebContentsViewAura target_managed=0
 2:55.07 pid:3335 [3352:3352:0821/114944.938263:WARNING:ui/aura/window.cc:1456] StackChildLayerRelativeTo called with unmanaged layer(s). child=WebContentsViewAura child_managed=0 target=WebContentsViewAura target_managed=0
 2:55.11 pid:3335 [3352:3352:0821/114944.975909:WARNING:ui/aura/window.cc:1456] StackChildLayerRelativeTo called with unmanaged layer(s). child=WebContentsViewAura child_managed=0 target=WebContentsViewAura target_managed=0
 2:55.11 pid:3335 [3352:3352:0821/114944.978029:WARNING:ui/aura/window.cc:1456] StackChildLayerRelativeTo called with unmanaged layer(s). child=WebContentsViewAura child_managed=0 target=WebContentsViewAura target_managed=0
 2:55.15 pid:3335 [3352:3352:0821/114945.022954:WARNING:ui/aura/window.cc:1456] StackChildLayerRelativeTo called with unmanaged layer(s). child=WebContentsViewAura child_managed=0 target=WebContentsViewAura target_managed=0
 2:55.16 pid:3335 [3352:3352:0821/114945.023047:WARNING:ui/aura/window.cc:1456] StackChildLayerRelativeTo called with unmanaged layer(s). child=WebContentsViewAura child_managed=0 target=WebContentsViewAura target_managed=0
 2:55.21 TEST_END: Test OK. Subtests passed 1/1. Unexpected 0
 2:55.21 TEST_START: /webmcp/imperative/getTools-filtering.https.html
 2:55.24 pid:3335 [3828:3828:0821/114945.105348:WARNING:content/child/runtime_features.cc:529] SharedStorage cannot be enabled in this configuration. Use --enable-features=SharedStorageAPI in addition.
 2:55.24 pid:3335 [3828:3828:0821/114945.106001:WARNING:content/child/runtime_features.cc:539] AttributionReporting cannot be enabled in this configuration. Use --enable-features=ConversionMeasurement in addition.
 2:55.25 pid:3335 [3352:3352:0821/114945.124458:WARNING:ui/aura/window.cc:1456] StackChildLayerRelativeTo called with unmanaged layer(s). child=WebContentsViewAura child_managed=0 target=WebContentsViewAura target_managed=0
 2:55.26 pid:3335 [3352:3352:0821/114945.124568:WARNING:ui/aura/window.cc:1456] StackChildLayerRelativeTo called with unmanaged layer(s). child=WebContentsViewAura child_managed=0 target=WebContentsViewAura target_managed=0
 2:55.54 pid:3335 [3352:3352:0821/114945.407258:WARNING:ui/aura/window.cc:1456] StackChildLayerRelativeTo called with unmanaged layer(s). child=WebContentsViewAura child_managed=0 target=WebContentsViewAura target_managed=0
 2:55.54 pid:3335 [3352:3352:0821/114945.407320:WARNING:ui/aura/window.cc:1456] StackChildLayerRelativeTo called with unmanaged layer(s). child=WebContentsViewAura child_managed=0 target=WebContentsViewAura target_managed=0
 2:55.56 pid:3335 [3846:3846:0821/114945.431870:WARNING:content/child/runtime_features.cc:529] SharedStorage cannot be enabled in this configuration. Use --enable-features=SharedStorageAPI in addition.
 2:55.56 pid:3335 [3846:3846:0821/114945.432155:WARNING:content/child/runtime_features.cc:539] AttributionReporting cannot be enabled in this configuration. Use --enable-features=ConversionMeasurement in addition.
 2:55.59 TEST_END: Test OK. Subtests passed 2/2. Unexpected 0
 2:55.59 TEST_START: /webmcp/imperative/getTools-imperative-schema.https.html
 2:55.62 pid:3335 [3859:3859:0821/114945.491240:WARNING:content/child/runtime_features.cc:529] SharedStorage cannot be enabled in this configuration. Use --enable-features=SharedStorageAPI in addition.
 2:55.62 pid:3335 [3859:3859:0821/114945.491832:WARNING:content/child/runtime_features.cc:539] AttributionReporting cannot be enabled in this configuration. Use --enable-features=ConversionMeasurement in addition.
 2:55.64 pid:3335 [3352:3352:0821/114945.508204:WARNING:ui/aura/window.cc:1456] StackChildLayerRelativeTo called with unmanaged layer(s). child=WebContentsViewAura child_managed=0 target=WebContentsViewAura target_managed=0
 2:55.64 pid:3335 [3352:3352:0821/114945.508292:WARNING:ui/aura/window.cc:1456] StackChildLayerRelativeTo called with unmanaged layer(s). child=WebContentsViewAura child_managed=0 target=WebContentsViewAura target_managed=0
 2:55.78 pid:3335 [3352:3352:0821/114945.654226:WARNING:ui/aura/window.cc:1456] StackChildLayerRelativeTo called with unmanaged layer(s). child=WebContentsViewAura child_managed=0 target=WebContentsViewAura target_managed=0
 2:55.79 pid:3335 [3352:3352:0821/114945.654304:WARNING:ui/aura/window.cc:1456] StackChildLayerRelativeTo called with unmanaged layer(s). child=WebContentsViewAura child_managed=0 target=WebContentsViewAura target_managed=0
 2:55.84 TEST_END: Test OK. Subtests passed 1/1. Unexpected 0
 2:55.84 TEST_START: /webmcp/imperative/register-tool-title.https.html
 2:55.86 pid:3335 [3874:3874:0821/114945.733143:WARNING:content/child/runtime_features.cc:529] SharedStorage cannot be enabled in this configuration. Use --enable-features=SharedStorageAPI in addition.
 2:55.87 pid:3335 [3874:3874:0821/114945.733699:WARNING:content/child/runtime_features.cc:539] AttributionReporting cannot be enabled in this configuration. Use --enable-features=ConversionMeasurement in addition.
 2:55.88 pid:3335 [3352:3352:0821/114945.745559:WARNING:ui/aura/window.cc:1456] StackChildLayerRelativeTo called with unmanaged layer(s). child=WebContentsViewAura child_managed=0 target=WebContentsViewAura target_managed=0
 2:55.88 pid:3335 [3352:3352:0821/114945.745679:WARNING:ui/aura/window.cc:1456] StackChildLayerRelativeTo called with unmanaged layer(s). child=WebContentsViewAura child_managed=0 target=WebContentsViewAura target_managed=0
 2:56.05 pid:3335 [3352:3352:0821/114945.915962:WARNING:ui/aura/window.cc:1456] StackChildLayerRelativeTo called with unmanaged layer(s). child=WebContentsViewAura child_managed=0 target=WebContentsViewAura target_managed=0
 2:56.05 pid:3335 [3352:3352:0821/114945.916044:WARNING:ui/aura/window.cc:1456] StackChildLayerRelativeTo called with unmanaged layer(s). child=WebContentsViewAura child_managed=0 target=WebContentsViewAura target_managed=0
 2:56.10 TEST_END: Test OK. Subtests passed 3/3. Unexpected 0
 2:56.10 TEST_START: /webmcp/imperative/unregister-during-executeTool.https.html
 2:56.12 pid:3335 [3890:3890:0821/114945.988031:WARNING:content/child/runtime_features.cc:529] SharedStorage cannot be enabled in this configuration. Use --enable-features=SharedStorageAPI in addition.
 2:56.12 pid:3335 [3890:3890:0821/114945.988328:WARNING:content/child/runtime_features.cc:539] AttributionReporting cannot be enabled in this configuration. Use --enable-features=ConversionMeasurement in addition.
 2:56.13 pid:3335 [3352:3352:0821/114945.997472:WARNING:ui/aura/window.cc:1456] StackChildLayerRelativeTo called with unmanaged layer(s). child=WebContentsViewAura child_managed=0 target=WebContentsViewAura target_managed=0
 2:56.13 pid:3335 [3352:3352:0821/114945.998117:WARNING:ui/aura/window.cc:1456] StackChildLayerRelativeTo called with unmanaged layer(s). child=WebContentsViewAura child_managed=0 target=WebContentsViewAura target_managed=0
 2:56.33 pid:3335 [3352:3352:0821/114946.195280:INFO:CONSOLE:1524] "Uncaught Error: assert_unreached: options.signal on tool side should NOT be aborted when tool is unregistered Reached unreachable code", source: https://web-platform.test:8443/resources/testharness.js (1524)
 2:56.33 pid:3335 [3352:3352:0821/114946.198290:INFO:CONSOLE:0] "Uncaught (in promise) UnknownError: The operation failed for an unknown transient reason (e.g. out of memory).", source: https://web-platform.test:8443/webmcp/imperative/unregister-during-executeTool.https.html (0)
 2:56.34 pid:3335 [3352:3352:0821/114946.207398:INFO:CONSOLE:99] "WebMCP tool execution failed: Uncaught TypeError: Cannot read properties of undefined (reading 'signal')", source: https://web-platform.test:8443/webmcp/imperative/unregister-during-executeTool.https.html (99)
 2:56.34 pid:3335 [3352:3352:0821/114946.207983:INFO:CONSOLE:0] "Uncaught (in promise) UnknownError: Tool was executed but the invocation failed. For example, the script function threw an error", source: https://web-platform.test:8443/webmcp/imperative/unregister-during-executeTool.https.html (0)
 3:06.26 pid:3335 [3352:3352:0821/114956.127594:WARNING:ui/aura/window.cc:1456] StackChildLayerRelativeTo called with unmanaged layer(s). child=WebContentsViewAura child_managed=0 target=WebContentsViewAura target_managed=0
 3:06.26 pid:3335 [3352:3352:0821/114956.127653:WARNING:ui/aura/window.cc:1456] StackChildLayerRelativeTo called with unmanaged layer(s). child=WebContentsViewAura child_managed=0 target=WebContentsViewAura target_managed=0
 3:06.31 TEST_END: Test ERROR, expected OK. Subtests passed 0/2. Unexpected 2
FAIL Pending executeTool() Promise resolves successfully when the target cross-origin tool is unregistered mid-execution - promise_test: Unhandled rejection with value: object "UnknownError: The operation failed for an unknown transient reason (e.g. out of memory)."
Error
    at get_stack (https://web-platform.test:8443/resources/testharness.js:4802:21)
    at new AssertionError (https://web-platform.test:8443/resources/testharness.js:4795:22)
    at assert (https://web-platform.test:8443/resources/testharness.js:4779:19)
    at Test.<anonymous> (https://web-platform.test:8443/resources/testharness.js:764:29)
    at Test.step (https://web-platform.test:8443/resources/testharness.js:2869:25)
    at https://web-platform.test:8443/resources/testharness.js:2916:35
TIMEOUT Pending executeTool() Promise resolves successfully when target same-document tool is unregistered mid-execution - Test timed outERROR /webmcp/imperative/unregister-during-executeTool.https.html - Unhandled rejection: Tool was executed but the invocation failed. For example, the script function threw an error
UnknownError: Tool was executed but the invocation failed. For example, the script function threw an error

 3:06.31 INFO No more tests
 3:06.36 INFO Closing logging queue
 3:06.37 INFO queue closed
 3:06.43 SUITE_END

web-platform-test
~~~~~~~~~~~~~~~~~
Ran 68 checks (42 subtests, 26 tests)
Expected results: 51
Unexpected results: 17
  test: 6 (1 crash, 3 error, 2 timeout)
  subtest: 11 (8 fail, 3 timeout)

Error Summary
-------------
/webmcp/declarative/executeTool-abort.https.html
  TIMEOUT executeTool signal successfully resets tool pseudo-classes - Test timed out
  TIMEOUT /webmcp/declarative/executeTool-abort.https.html
/webmcp/declarative/executeTool-respondWith-circular-object.https.html
  FAIL Declarative tool executeTool() rejects when respondWith() receives a circular object - assert_unreached: Should have rejected: executeTool() should reject with UnknownError when respondWith is passed a circular object Reached unreachable code
    at async Test.<anonymous> (https://web-platform.test:8443/webmcp/declarative/executeTool-respondWith-circular-object.https.html:27:3)
  ERROR /webmcp/declarative/executeTool-respondWith-circular-object.https.html - Unhandled rejection: Converting circular structure to JSON
    --> starting at object with constructor 'Object'
    --- property 'a' closes the circle
TypeError: Converting circular structure to JSON
    --> starting at object with constructor 'Object'
    --- property 'a' closes the circle
/webmcp/declarative/form_removal_submit_crash.https.html
  FAIL Form removal on submit with respondWith does not crash the renderer - promise_test: Unhandled rejection with value: object "UnknownError: The operation failed for an unknown transient reason (e.g. out of memory)."
Error
    at get_stack (https://web-platform.test:8443/resources/testharness.js:4802:21)
    at new AssertionError (https://web-platform.test:8443/resources/testharness.js:4795:22)
    at assert (https://web-platform.test:8443/resources/testharness.js:4779:19)
    at Test.<anonymous> (https://web-platform.test:8443/resources/testharness.js:764:29)
    at Test.step (https://web-platform.test:8443/resources/testharness.js:2869:25)
    at Test.step_func (https://web-platform.test:8443/resources/testharness.js:2916:35)
/webmcp/declarative/no-frame-documents.https.html
  CRASH /webmcp/declarative/no-frame-documents.https.html
/webmcp/declarative/unregister-during-executeTool.https.html
  FAIL Pending executeTool() Promise resolves successfully when target declarative tool is unregistered via DOM removal - promise_test: Unhandled rejection with value: object "UnknownError: The operation failed for an unknown transient reason (e.g. out of memory)."
Error
    at get_stack (https://web-platform.test:8443/resources/testharness.js:4802:21)
    at new AssertionError (https://web-platform.test:8443/resources/testharness.js:4795:22)
    at assert (https://web-platform.test:8443/resources/testharness.js:4779:19)
    at Test.<anonymous> (https://web-platform.test:8443/resources/testharness.js:764:29)
    at Test.step (https://web-platform.test:8443/resources/testharness.js:2869:25)
    at https://web-platform.test:8443/resources/testharness.js:2916:35
  FAIL Pending executeTool() Promise resolves successfully when target declarative tool is unregistered via attribute removal - promise_test: Unhandled rejection with value: object "UnknownError: The operation failed for an unknown transient reason (e.g. out of memory)."
Error
    at get_stack (https://web-platform.test:8443/resources/testharness.js:4802:21)
    at new AssertionError (https://web-platform.test:8443/resources/testharness.js:4795:22)
    at assert (https://web-platform.test:8443/resources/testharness.js:4779:19)
    at Test.<anonymous> (https://web-platform.test:8443/resources/testharness.js:764:29)
    at Test.step (https://web-platform.test:8443/resources/testharness.js:2869:25)
    at https://web-platform.test:8443/resources/testharness.js:2916:35
  ERROR /webmcp/declarative/unregister-during-executeTool.https.html - Unhandled rejection: The operation failed for an unknown transient reason (e.g. out of memory).
UnknownError: The operation failed for an unknown transient reason (e.g. out of memory).
/webmcp/imperative/executeTool-caller-navigate-abort.https.html
  FAIL executeTool() aborts target signal when the invoker document (same-origin) navigates away - promise_test: Unhandled rejection with value: "signal not provided to execute()"
Error
    at get_stack (https://web-platform.test:8443/resources/testharness.js:4802:21)
    at new AssertionError (https://web-platform.test:8443/resources/testharness.js:4795:22)
    at assert (https://web-platform.test:8443/resources/testharness.js:4779:19)
    at Test.<anonymous> (https://web-platform.test:8443/resources/testharness.js:764:29)
    at Test.step (https://web-platform.test:8443/resources/testharness.js:2869:25)
    at https://web-platform.test:8443/resources/testharness.js:2916:35
  FAIL executeTool() aborts target signal when the invoker document (cross-origin) navigates away - promise_test: Unhandled rejection with value: "signal not provided to execute()"
Error
    at get_stack (https://web-platform.test:8443/resources/testharness.js:4802:21)
    at new AssertionError (https://web-platform.test:8443/resources/testharness.js:4795:22)
    at assert (https://web-platform.test:8443/resources/testharness.js:4779:19)
    at Test.<anonymous> (https://web-platform.test:8443/resources/testharness.js:764:29)
    at Test.step (https://web-platform.test:8443/resources/testharness.js:2869:25)
    at https://web-platform.test:8443/resources/testharness.js:2916:35
/webmcp/imperative/executeTool-signal-cross-origin.https.html
  FAIL caller abort in parent document propagates to options.signal in cross-origin iframe tool - assert_equals: signal should have been provided to iframe tool expected (undefined) undefined but got (string) "no signal provided"
    at Test.<anonymous> (https://web-platform.test:8443/webmcp/imperative/executeTool-signal-cross-origin.https.html:70:3)
  TIMEOUT caller abort in cross-origin iframe propagates to options.signal in parent document tool - Test timed out
  TIMEOUT /webmcp/imperative/executeTool-signal-cross-origin.https.html
/webmcp/imperative/unregister-during-executeTool.https.html
  FAIL Pending executeTool() Promise resolves successfully when the target cross-origin tool is unregistered mid-execution - promise_test: Unhandled rejection with value: object "UnknownError: The operation failed for an unknown transient reason (e.g. out of memory)."
Error
    at get_stack (https://web-platform.test:8443/resources/testharness.js:4802:21)
    at new AssertionError (https://web-platform.test:8443/resources/testharness.js:4795:22)
    at assert (https://web-platform.test:8443/resources/testharness.js:4779:19)
    at Test.<anonymous> (https://web-platform.test:8443/resources/testharness.js:764:29)
    at Test.step (https://web-platform.test:8443/resources/testharness.js:2869:25)
    at https://web-platform.test:8443/resources/testharness.js:2916:35
  TIMEOUT Pending executeTool() Promise resolves successfully when target same-document tool is unregistered mid-execution - Test timed out
  ERROR /webmcp/imperative/unregister-during-executeTool.https.html - Unhandled rejection: Tool was executed but the invocation failed. For example, the script function threw an error
UnknownError: Tool was executed but the invocation failed. For example, the script function threw an error
 3:06.43 INFO Got 8 unexpected results, with 0 unexpected passes
 3:06.44 wptserve INFO Stopped http server on 127.0.0.1:8000
 3:06.44 wptserve INFO Stopped http server on 127.0.0.1:8003
 3:06.44 wptserve INFO Stopped http server on 127.0.0.1:8001
 3:06.44 wptserve INFO Stopped http server on 127.0.0.1:8002
 3:06.44 wptserve INFO Stopped http server on 127.0.0.1:8444
 3:06.44 wptserve INFO Stopped http server on 127.0.0.1:8443
 3:06.46 wptserve INFO Stopped http server on 127.0.0.1:8445
 3:06.46 wptserve INFO Stopped http server on 127.0.0.1:8446
 3:06.46 wptserve INFO Stopped http server on 127.0.0.1:9000
 3:06.47 wptserve INFO Stopped WebTransport over HTTP/3 server on 127.0.0.1:11000
 3:06.55 wptserve INFO Close on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8889))
 3:06.56 wptserve INFO Close on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8888))
 3:06.60 INFO Removed font: Ahem.ttf
 3:06.62 INFO Closing logging queue
 3:06.62 INFO queue closed
 3:06.62 INFO Tolerating 8 unexpected results
/usr/lib/python3.10/multiprocessing/resource_tracker.py:224: UserWarning: resource_tracker: There appear to be 3 leaked semaphore objects to clean up at shutdown
  warnings.warn('resource_tracker: There appear to be %d '
[taskcluster 2026-08-21 11:49:59.234Z] === Task Finished ===
[taskcluster 2026-08-21 11:50:00.266Z] Successful task run with exit code: 0 completed in 280.604 seconds