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Aug 28, 2026 · Catalog foundation is up

Specification feature · interfaces

WebMCP execution cancellationWebMCP draft 2026-08-26

Cancel pending tool registration or execution through abort signals and lifecycle rules.

Terminology basis: WebMCP draft 2026-08-26. WebMCP draft 2026-08-26

WebMCP execution cancellation: 1 supported, 0 partial, 0 unsupported, 30 unreviewed across 31 cataloged products.

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Current evidence by product

Can my agent use WebMCP execution cancellation?

Read across for the answer. 1 of 31 current product columns have reviewed evidence; unreviewed does not mean unsupported.

Known issues (0)Report an issue
  • Supported1
  • Partial0
  • Unsupported0
  • Unknown30
  • Not applicable0

Web

9 products

Desktop

13 products

CLI

9 products

Unknown means no public evidence has been reviewed for that product and capability. It does not mean unsupported.

How statuses are assigned

Definition and scope

What this capability means

Cancel pending tool registration or execution through abort signals and lifecycle rules.

WebMCP is a draft Community Group Report, not a W3C Standard. Positive implementation cells must retain origin-trial, version, permissions, and agent-integration qualifiers.

Traceable compatibility

Assertion ledger

Documentation evidence only. No runtime conformance test is implied.

Chrome WebMCP origin trialdesktop · current
Supported
Target
Chrome 153 WebMCP origin-trial documentation · dated-documentation
Environment
preview-enabled
Observed
2026-08-28
  • origin-trialWebMCP is an experimental origin trial and local testing requires the enable-webmcp-testing flag
  • protocol-revisionChrome 153 separates tool unregistration from cancellation of in-flight execution; execution cancellation remains exposed through AbortSignal
Evidence
  1. 1. Evidence checked 2026-08-28: Chrome's WebMCP Imperative API documentation exposes AbortSignal for canceling pending execution and passes a cancellation signal into the tool callback; Chrome 153 separately changed registration abort so unregistering no longer breaks in-flight work.