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Roll protocol to r1596832
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‎changelog.md‎

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@@ -1,7 +1,18 @@
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## Roll protocol to r1596832 — _2026-03-10T04:53:52.000Z_
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###### Diff: [`50eddc4...734ff67`](https://github.com/ChromeDevTools/devtools-protocol/compare/50eddc4...734ff67)
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```diff
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@@ browser_protocol.pdl:56 @@ include domains/Tethering.pdl
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include domains/Tracing.pdl
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include domains/WebAudio.pdl
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include domains/WebAuthn.pdl
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+include domains/WebMCP.pdl
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```
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## Roll protocol to r1595872 — _2026-03-07T04:48:07.000Z_
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###### Diff: [`374f160...05d7571`](https://github.com/ChromeDevTools/devtools-protocol/compare/374f160...05d7571)
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###### Diff: [`374f160...50eddc4`](https://github.com/ChromeDevTools/devtools-protocol/compare/374f160...50eddc4)
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```diff
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@@ domains/Audits.pdl:258 @@ experimental domain Audits
@@ -42290,73 +42301,4 @@ index 0dbdc01d..7a3c772c 100644
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+ optional Page.FrameId frameId
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# Credit card information to fill out the form. Credit card data is not saved.
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CreditCard card
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```
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## Roll protocol to r1143632 — _2023-05-13T04:26:23.000Z_
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###### Diff: [`53a0f38...3c6f201`](https://github.com/ChromeDevTools/devtools-protocol/compare/53a0f38...3c6f201)
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```diff
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@@ browser_protocol.pdl:10996 @@ experimental domain Preload
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SameSiteCrossOriginNavigationNotOptInInMainFrameNavigation
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MemoryPressureOnTrigger
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MemoryPressureAfterTriggered
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+ SpeculationRuleRemoved
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+ TriggerPageNavigated
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+ OtherPrerenderedPageActivated
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# Fired when a prerender attempt is completed.
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event prerenderAttemptCompleted
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@@ -11035,6 +11038,44 @@ experimental domain Preload
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# PreloadingTriggeringOutcome which not used by prefetch nor prerender.
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NotSupported
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+ # TODO(https://crbug.com/1384419): revisit the list of PrefetchStatus and
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+ # filter out the ones that aren't necessary to the developers.
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+ type PrefetchStatus extends string
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+ enum
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+ # Prefetch is not disabled by PrefetchHeldback.
42318-
+ PrefetchAllowed
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+ PrefetchFailedIneligibleRedirect
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+ PrefetchFailedInvalidRedirect
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+ PrefetchFailedMIMENotSupported
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+ PrefetchFailedNetError
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+ PrefetchFailedNon2XX
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+ PrefetchFailedPerPageLimitExceeded
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+ PrefetchHeldback
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+ # A previous prefetch to the origin got a HTTP 503 response with an
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+ # Retry-After header that has no elapsed yet.
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+ PrefetchIneligibleRetryAfter
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+ PrefetchIsPrivacyDecoy
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+ PrefetchIsStale
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+ PrefetchNotEligibleBrowserContextOffTheRecord
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+ PrefetchNotEligibleDataSaverEnabled
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+ PrefetchNotEligibleExistingProxy
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+ PrefetchNotEligibleHostIsNonUnique
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+ PrefetchNotEligibleNonDefaultStoragePartition
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+ PrefetchNotEligibleSameSiteCrossOriginPrefetchRequiredProxy
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+ PrefetchNotEligibleSchemeIsNotHttps
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+ PrefetchNotEligibleUserHasCookies
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+ PrefetchNotEligibleUserHasServiceWorker
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+ PrefetchNotFinishedInTime
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+ PrefetchNotStarted
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+ PrefetchNotUsedCookiesChanged
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+ PrefetchProxyNotAvailable
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+ # The response of the prefetch is used for the next navigation. This is
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+ # the final successful state.
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+ PrefetchResponseUsed
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+ # The prefetch finished successfully but was never used.
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+ PrefetchSuccessfulButNotUsed
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+ PrefetchNotUsedProbeFailed
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+
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# Fired when a prefetch attempt is updated.
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event prefetchStatusUpdated
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parameters
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@@ -11043,6 +11084,7 @@ experimental domain Preload
42355-
Page.FrameId initiatingFrameId
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string prefetchUrl
42357-
PreloadingStatus status
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+ PrefetchStatus prefetchStatus
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# Fired when a prerender attempt is updated.
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event prerenderStatusUpdated
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```

‎json/browser_protocol.json‎

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@@ -31384,6 +31384,118 @@
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]
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}
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]
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},
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{
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"domain": "WebMCP",
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"experimental": true,
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"dependencies": [
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"Runtime",
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"Page",
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"DOM"
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],
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"types": [
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{
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"id": "Annotation",
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"description": "Tool annotations",
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"type": "object",
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"properties": [
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{
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"name": "readOnly",
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"description": "A hint indicating that the tool does not modify any state.",
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"optional": true,
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"type": "boolean"
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},
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{
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"name": "autosubmit",
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"description": "If the declarative tool was declared with the autosubmit attribute.",
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"optional": true,
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"type": "boolean"
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}
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]
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},
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{
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"id": "Tool",
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"description": "Definition of a tool that can be invoked.",
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"type": "object",
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"properties": [
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{
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"name": "name",
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"description": "Tool name.",
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"type": "string"
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},
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{
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"name": "description",
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"description": "Tool description.",
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"type": "string"
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},
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{
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"name": "inputSchema",
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"description": "Schema for the tool's input parameters.",
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"optional": true,
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"type": "object"
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},
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{
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"name": "annotations",
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"description": "Optional annotations for the tool.",
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"optional": true,
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"$ref": "Annotation"
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},
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{
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"name": "frameId",
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"description": "Frame identifier associated with the tool registration.",
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"$ref": "Page.FrameId"
31447+
},
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{
31449+
"name": "backendNodeId",
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"description": "Optional node ID for declarative tools.",
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"optional": true,
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"$ref": "DOM.BackendNodeId"
31453+
},
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{
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"name": "stackTrace",
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"description": "The stack trace at the time of the registration.",
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"optional": true,
31458+
"$ref": "Runtime.StackTrace"
31459+
}
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]
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}
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],
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"commands": [
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{
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"name": "enable",
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"description": "Enables the WebMCP domain, allowing events to be sent. Enabling the domain will trigger a toolsAdded event for\nall currently registered tools."
31467+
}
31468+
],
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"events": [
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{
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"name": "toolsAdded",
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"description": "Event fired when new tools are added.",
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"parameters": [
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{
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"name": "tools",
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"description": "Array of tools that were added.",
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"type": "array",
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"items": {
31479+
"$ref": "Tool"
31480+
}
31481+
}
31482+
]
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},
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{
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"name": "toolsRemoved",
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"description": "Event fired when tools are removed.",
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"parameters": [
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{
31489+
"name": "tools",
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"description": "Array of tools that were removed.",
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"type": "array",
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"items": {
31493+
"$ref": "Tool"
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}
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}
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]
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}
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]
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}
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]
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}

‎package-lock.json‎

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‎package.json‎

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{
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"name": "devtools-protocol",
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"version": "0.0.1595872",
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"version": "0.0.1596832",
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"description": "The Chrome DevTools Protocol JSON",
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"repository": "https://github.com/ChromeDevTools/devtools-protocol",
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"author": "The Chromium Authors",

‎pdl/browser_protocol.pdl‎

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@@ -56,3 +56,4 @@ include domains/Tethering.pdl
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include domains/Tracing.pdl
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include domains/WebAudio.pdl
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include domains/WebAuthn.pdl
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include domains/WebMCP.pdl

‎types/protocol-mapping.d.ts‎

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@@ -1114,6 +1114,14 @@ export namespace ProtocolMapping {
11141114
* Triggered when a credential is used in a webauthn assertion.
11151115
*/
11161116
'WebAuthn.credentialAsserted': [Protocol.WebAuthn.CredentialAssertedEvent];
1117+
/**
1118+
* Event fired when new tools are added.
1119+
*/
1120+
'WebMCP.toolsAdded': [Protocol.WebMCP.ToolsAddedEvent];
1121+
/**
1122+
* Event fired when tools are removed.
1123+
*/
1124+
'WebMCP.toolsRemoved': [Protocol.WebMCP.ToolsRemovedEvent];
11171125
}
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11191127
export interface Commands {
@@ -6318,6 +6326,14 @@ export namespace ProtocolMapping {
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paramsType: [Protocol.WebAuthn.SetCredentialPropertiesRequest];
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returnType: void;
63206328
};
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/**
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* Enables the WebMCP domain, allowing events to be sent. Enabling the domain will trigger a toolsAdded event for
6331+
* all currently registered tools.
6332+
*/
6333+
'WebMCP.enable': {
6334+
paramsType: [];
6335+
returnType: void;
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};
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}
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}
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‎types/protocol-proxy-api.d.ts‎

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@@ -122,6 +122,8 @@ export namespace ProtocolProxyApi {
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WebAuthn: WebAuthnApi;
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WebMCP: WebMCPApi;
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}
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127129

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54955497
on(event: 'credentialAsserted', listener: (params: Protocol.WebAuthn.CredentialAssertedEvent) => void): void;
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54975499
}
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5501+
export interface WebMCPApi {
5502+
/**
5503+
* Enables the WebMCP domain, allowing events to be sent. Enabling the domain will trigger a toolsAdded event for
5504+
* all currently registered tools.
5505+
*/
5506+
enable(): Promise<void>;
5507+
5508+
/**
5509+
* Event fired when new tools are added.
5510+
*/
5511+
on(event: 'toolsAdded', listener: (params: Protocol.WebMCP.ToolsAddedEvent) => void): void;
5512+
5513+
/**
5514+
* Event fired when tools are removed.
5515+
*/
5516+
on(event: 'toolsRemoved', listener: (params: Protocol.WebMCP.ToolsRemovedEvent) => void): void;
5517+
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}
54985519
}
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export default ProtocolProxyApi;

‎types/protocol-tests-proxy-api.d.ts‎

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WebAuthn: WebAuthnApi;
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WebMCP: WebMCPApi;
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125127
}
126128

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59695971
onceCredentialAsserted(eventMatcher?: (event: { params: Protocol.WebAuthn.CredentialAssertedEvent }) => boolean): Promise<{ params: Protocol.WebAuthn.CredentialAssertedEvent }>;
59705972

59715973
}
5974+
5975+
export interface WebMCPApi {
5976+
/**
5977+
* Enables the WebMCP domain, allowing events to be sent. Enabling the domain will trigger a toolsAdded event for
5978+
* all currently registered tools.
5979+
*/
5980+
enable(): Promise<{id: number, result: void, sessionId: string}>;
5981+
5982+
/**
5983+
* Event fired when new tools are added.
5984+
*/
5985+
onToolsAdded(listener: (event: { params: Protocol.WebMCP.ToolsAddedEvent }) => void): void;
5986+
offToolsAdded(listener: (event: { params: Protocol.WebMCP.ToolsAddedEvent }) => void): void;
5987+
onceToolsAdded(eventMatcher?: (event: { params: Protocol.WebMCP.ToolsAddedEvent }) => boolean): Promise<{ params: Protocol.WebMCP.ToolsAddedEvent }>;
5988+
5989+
/**
5990+
* Event fired when tools are removed.
5991+
*/
5992+
onToolsRemoved(listener: (event: { params: Protocol.WebMCP.ToolsRemovedEvent }) => void): void;
5993+
offToolsRemoved(listener: (event: { params: Protocol.WebMCP.ToolsRemovedEvent }) => void): void;
5994+
onceToolsRemoved(eventMatcher?: (event: { params: Protocol.WebMCP.ToolsRemovedEvent }) => boolean): Promise<{ params: Protocol.WebMCP.ToolsRemovedEvent }>;
5995+
5996+
}
59725997
}
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59745999
export default ProtocolTestsProxyApi;

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