third_party/blink/renderer/core/script_tools/model_context_tool.idl

// Copyright 2026 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// https://webmachinelearning.github.io/webmcp/#dictdef-modelcontexttool.
dictionary ModelContextTool {
  required DOMString name;
  // This is a `USVString` since it is intended to be used in possibly native
  // displays, so it must be UTF-8 compliant and contain no unmatched
  // surrogates. See
  // https://w3ctag.github.io/design-principles/#idl-string-types.
  USVString title;
  required DOMString description;
  object inputSchema;
  required ToolExecuteCallback execute;
  ToolAnnotations annotations;
};

// https://webmachinelearning.github.io/webmcp/#dictdef-toolannotations.
dictionary ToolAnnotations {
  boolean readOnlyHint = false;
  boolean untrustedContentHint = false;
};

// The structure of `input` is expected to match the structure described in
// `ModelContextTool#inputSchema` above. This is currently not enforced upon
// tool execution, but will likely be when
// https://github.com/webmachinelearning/webmcp/issues/92 is addressed.
callback ToolExecuteCallback = Promise<any>(object input);