web-debug-mcp

Overview Schema Source Related Servers Discussions Admin

Perform bounded browser action

web_browser_action

Destructive

Perform browser actions like navigate, click, fill, press, select, check, hover, scroll, wait, or reload using exact locators, or run an authorized WebMCP page tool to debug and verify web flows.

Instructions

Navigate, click, fill, press, select, check, hover, scroll, wait, or reload with exact locators, or execute one explicitly authorized direct WebMCP page tool. WebMCP calls are bounded, opaque, non-replayable, and never retried.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`action`	Yes
`sessionId`	Yes

Output Schema

TableJSON Schema

Name	Required	Description	Default
`ok`	Yes
`data`	No
`error`	No
`warnings`	Yes
`artifacts`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

Changed2 schema fields changedv0.10.0Sep 8, 2026

addedInput schema / definitions / LocatorOutput

Added value: +{
+  "oneOf": [
+    {
+      "additionalProperties": false,
+      "properties": {
+        "kind": {
+          "const": "css",
+          "type": "string"
+        },
+        "value": {
+          "maxLength": 500,
+          "type": "string"
+        }
+      },
+      "required": [
+        "kind",
+        "value"
+      ],
+      "type": "object"
+    },
+    {
+      "additionalProperties": false,
+      "properties": {
+        "kind": {
+          "const": "role",
+          "type": "string"
+        },
+        "name": {
+          "maxLength": 300,
+          "type": "string"
+        },
+        "role": {
+          "maxLength": 100,
+          "type": "string"
+        }
+      },
+      "required": [
+        "kind",
+        "role"
+      ],
+      "type": "object"
+    },
+    {
+      "additionalProperties": false,
+      "properties": {
+        "kind": {
+          "const": "text",
+          "type": "string"
+        },
+        "text": {
+          "maxLength": 500,
+          "type": "string"
+        }
+      },
+      "required": [
+        "kind",
+        "text"
+      ],
+      "type": "object"
+    },
+    {
+      "additionalProperties": false,
+      "properties": {
+        "kind": {
+          "const": "label",
+          "type": "string"
+        },
+        "text": {
+          "maxLength": 500,
+          "type": "string"
+        }
+      },
+      "required": [
+        "kind",
+        "text"
+      ],
+      "type": "object"
+    },
+    {
+      "additionalProperties": false,
+      "properties": {
+        "kind": {
+          "const": "testId",
+          "type": "string"
+        },
+        "value": {
+          "maxLength": 500,
+          "type": "string"
+        }
+      },
+      "required": [
+        "kind",
+        "value"
+      ],
+      "type": "object"
+    }
+  ]
+}

changedInput schema / properties / action / oneOf

Previous value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "kind": {
-        "const": "navigate",
-        "type": "string"
-      },
-      "url": {
-        "maxLength": 2560,
-        "type": "string"
-      }
-    },
-    "required": [
-      "kind",
-      "url"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "kind": {
-        "const": "click",
-        "type": "string"
-      },
-      "locator": {
-        "oneOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "css",
-                "type": "string"
-              },
-              "value": {
-                "maxLength": 500,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "value"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "role",
-                "type": "string"
-              },
-              "name": {
-                "maxLength": 300,
-                "type": "string"
-              },
-              "role": {
-                "maxLength": 100,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "role"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "text",
-                "type": "string"
-              },
-              "text": {
-                "maxLength": 500,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "text"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "label",
-                "type": "string"
-              },
-              "text": {
-                "maxLength": 500,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "text"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "testId",
-                "type": "string"
-              },
-              "value": {
-                "maxLength": 500,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "value"
-            ],
-            "type": "object"
-          }
-        ]
-      }
-    },
-    "required": [
-      "kind",
-      "locator"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "kind": {
-        "const": "fill",
-        "type": "string"
-      },
-      "locator": {
-        "oneOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "css",
-                "type": "string"
-              },
-              "value": {
-                "maxLength": 500,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "value"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "role",
-                "type": "string"
-              },
-              "name": {
-                "maxLength": 300,
-                "type": "string"
-              },
-              "role": {
-                "maxLength": 100,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "role"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "text",
-                "type": "string"
-              },
-              "text": {
-                "maxLength": 500,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "text"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "label",
-                "type": "string"
-              },
-              "text": {
-                "maxLength": 500,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "text"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "testId",
-                "type": "string"
-              },
-              "value": {
-                "maxLength": 500,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "value"
-            ],
-            "type": "object"
-          }
-        ]
-      },
-      "value": {
-        "type": "string"
-      }
-    },
-    "required": [
-      "kind",
-      "locator",
-      "value"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "key": {
-        "maxLength": 40,
-        "type": "string"
-      },
-      "kind": {
-        "const": "press",
-        "type": "string"
-      },
-      "locator": {
-        "oneOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "css",
-                "type": "string"
-              },
-              "value": {
-                "maxLength": 500,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "value"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "role",
-                "type": "string"
-              },
-              "name": {
-                "maxLength": 300,
-                "type": "string"
-              },
-              "role": {
-                "maxLength": 100,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "role"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "text",
-                "type": "string"
-              },
-              "text": {
-                "maxLength": 500,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "text"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "label",
-                "type": "string"
-              },
-              "text": {
-                "maxLength": 500,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "text"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "testId",
-                "type": "string"
-              },
-              "value": {
-                "maxLength": 500,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "value"
-            ],
-            "type": "object"
-          }
-        ]
-      }
-    },
-    "required": [
-      "kind",
-      "locator",
-      "key"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "kind": {
-        "const": "select",
-        "type": "string"
-      },
-      "locator": {
-        "oneOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "css",
-                "type": "string"
-              },
-              "value": {
-                "maxLength": 500,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "value"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "role",
-                "type": "string"
-              },
-              "name": {
-                "maxLength": 300,
-                "type": "string"
-              },
-              "role": {
-                "maxLength": 100,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "role"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "text",
-                "type": "string"
-              },
-              "text": {
-                "maxLength": 500,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "text"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "label",
-                "type": "string"
-              },
-              "text": {
-                "maxLength": 500,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "text"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "testId",
-                "type": "string"
-              },
-              "value": {
-                "maxLength": 500,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "value"
-            ],
-            "type": "object"
-          }
-        ]
-      },
-      "value": {
-        "type": "string"
-      }
-    },
-    "required": [
-      "kind",
-      "locator",
-      "value"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "checked": {
-        "type": "boolean"
-      },
-      "kind": {
-        "const": "check",
-        "type": "string"
-      },
-      "locator": {
-        "oneOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "css",
-                "type": "string"
-              },
-              "value": {
-                "maxLength": 500,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "value"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "role",
-                "type": "string"
-              },
-              "name": {
-                "maxLength": 300,
-                "type": "string"
-              },
-              "role": {
-                "maxLength": 100,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "role"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "text",
-                "type": "string"
-              },
-              "text": {
-                "maxLength": 500,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "text"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "label",
-                "type": "string"
-              },
-              "text": {
-                "maxLength": 500,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "text"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "testId",
-                "type": "string"
-              },
-              "value": {
-                "maxLength": 500,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "value"
-            ],
-            "type": "object"
-          }
-        ]
-      }
-    },
-    "required": [
-      "kind",
-      "locator",
-      "checked"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "kind": {
-        "const": "hover",
-        "type": "string"
-      },
-      "locator": {
-        "oneOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "css",
-                "type": "string"
-              },
-              "value": {
-                "maxLength": 500,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "value"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "role",
-                "type": "string"
-              },
-              "name": {
-                "maxLength": 300,
-                "type": "string"
-              },
-              "role": {
-                "maxLength": 100,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "role"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "text",
-                "type": "string"
-              },
-              "text": {
-                "maxLength": 500,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "text"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "label",
-                "type": "string"
-              },
-              "text": {
-                "maxLength": 500,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "text"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "testId",
-                "type": "string"
-              },
-              "value": {
-                "maxLength": 500,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "value"
-            ],
-            "type": "object"
-          }
-        ]
-      }
-    },
-    "required": [
-      "kind",
-      "locator"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "kind": {
-        "const": "scroll",
-        "type": "string"
-      },
-      "locator": {
-        "oneOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "css",
-                "type": "string"
-              },
-              "value": {
-                "maxLength": 500,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "value"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "role",
-                "type": "string"
-              },
-              "name": {
-                "maxLength": 300,
-                "type": "string"
-              },
-              "role": {
-                "maxLength": 100,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "role"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "text",
-                "type": "string"
-              },
-              "text": {
-                "maxLength": 500,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "text"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "label",
-                "type": "string"
-              },
-              "text": {
-                "maxLength": 500,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "text"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "testId",
-                "type": "string"
-              },
-              "value": {
-                "maxLength": 500,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "value"
-            ],
-            "type": "object"
-          }
-        ]
-      }
-    },
-    "required": [
-      "kind",
-      "locator"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "expected": {
-        "anyOf": [
-          {
-            "type": "number"
-          },
-          {
-            "type": "boolean"
-          },
-          {
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "kind": {
-        "const": "wait",
-        "type": "string"
-      },
-      "locator": {
-        "oneOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "css",
-                "type": "string"
-              },
-              "value": {
-                "maxLength": 500,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "value"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "role",
-                "type": "string"
-              },
-              "name": {
-                "maxLength": 300,
-                "type": "string"
-              },
-              "role": {
-                "maxLength": 100,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "role"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "text",
-                "type": "string"
-              },
-              "text": {
-                "maxLength": 500,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "text"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "label",
-                "type": "string"
-              },
-              "text": {
-                "maxLength": 500,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "text"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "testId",
-                "type": "string"
-              },
-              "value": {
-                "maxLength": 500,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "value"
-            ],
-            "type": "object"
-          }
-        ]
-      },
-      "property": {
-        "enum": [
-          "count",
-          "visible",
-          "enabled",
-          "checked",
-          "text"
-        ],
-        "type": "string"
-      },
-      "timeoutMs": {
-        "maximum": 9007199254740991,
-        "minimum": -9007199254740991,
-        "type": "integer"
-      }
-    },
-    "required": [
-      "kind",
-      "locator",
-      "property",
-      "expected"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "kind": {
-        "const": "reload",
-        "type": "string"
-      }
-    },
-    "required": [
-      "kind"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "allowSideEffects": {
-        "const": true,
-        "type": "boolean"
-      },
-      "arguments": {
-        "additionalProperties": {
-          "$ref": "#/definitions/__schema0"
-        },
-        "propertyNames": {
-          "maxLength": 100,
-          "type": "string"
-        },
-        "type": "object"
-      },
-      "kind": {
-        "const": "webmcp",
-        "type": "string"
-      },
-      "name": {
-        "maxLength": 100,
-        "minLength": 1,
-        "type": "string"
-      },
-      "origin": {
-        "format": "uri",
-        "maxLength": 2560,
-        "type": "string"
-      },
-      "timeoutMs": {
-        "maximum": 30000,
-        "minimum": 1,
-        "type": "integer"
-      }
-    },
-    "required": [
-      "kind",
-      "origin",
-      "name",
-      "arguments",
-      "allowSideEffects"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "kind": {
+        "const": "navigate",
+        "type": "string"
+      },
+      "url": {
+        "maxLength": 2560,
+        "type": "string"
+      }
+    },
+    "required": [
+      "kind",
+      "url"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "kind": {
+        "const": "click",
+        "type": "string"
+      },
+      "locator": {
+        "$ref": "#/definitions/LocatorOutput"
+      }
+    },
+    "required": [
+      "kind",
+      "locator"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "kind": {
+        "const": "fill",
+        "type": "string"
+      },
+      "locator": {
+        "$ref": "#/definitions/LocatorOutput"
+      },
+      "value": {
+        "type": "string"
+      }
+    },
+    "required": [
+      "kind",
+      "locator",
+      "value"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "key": {
+        "maxLength": 40,
+        "type": "string"
+      },
+      "kind": {
+        "const": "press",
+        "type": "string"
+      },
+      "locator": {
+        "$ref": "#/definitions/LocatorOutput"
+      }
+    },
+    "required": [
+      "kind",
+      "locator",
+      "key"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "kind": {
+        "const": "select",
+        "type": "string"
+      },
+      "locator": {
+        "$ref": "#/definitions/LocatorOutput"
+      },
+      "value": {
+        "type": "string"
+      }
+    },
+    "required": [
+      "kind",
+      "locator",
+      "value"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "checked": {
+        "type": "boolean"
+      },
+      "kind": {
+        "const": "check",
+        "type": "string"
+      },
+      "locator": {
+        "$ref": "#/definitions/LocatorOutput"
+      }
+    },
+    "required": [
+      "kind",
+      "locator",
+      "checked"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "kind": {
+        "const": "hover",
+        "type": "string"
+      },
+      "locator": {
+        "$ref": "#/definitions/LocatorOutput"
+      }
+    },
+    "required": [
+      "kind",
+      "locator"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "kind": {
+        "const": "scroll",
+        "type": "string"
+      },
+      "locator": {
+        "$ref": "#/definitions/LocatorOutput"
+      }
+    },
+    "required": [
+      "kind",
+      "locator"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "expected": {
+        "anyOf": [
+          {
+            "type": "number"
+          },
+          {
+            "type": "boolean"
+          },
+          {
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "kind": {
+        "const": "wait",
+        "type": "string"
+      },
+      "locator": {
+        "$ref": "#/definitions/LocatorOutput"
+      },
+      "property": {
+        "enum": [
+          "count",
+          "visible",
+          "enabled",
+          "checked",
+          "text"
+        ],
+        "type": "string"
+      },
+      "timeoutMs": {
+        "maximum": 9007199254740991,
+        "minimum": -9007199254740991,
+        "type": "integer"
+      }
+    },
+    "required": [
+      "kind",
+      "locator",
+      "property",
+      "expected"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "kind": {
+        "const": "reload",
+        "type": "string"
+      }
+    },
+    "required": [
+      "kind"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "allowSideEffects": {
+        "const": true,
+        "type": "boolean"
+      },
+      "arguments": {
+        "additionalProperties": {
+          "$ref": "#/definitions/__schema0"
+        },
+        "propertyNames": {
+          "maxLength": 100,
+          "type": "string"
+        },
+        "type": "object"
+      },
+      "kind": {
+        "const": "webmcp",
+        "type": "string"
+      },
+      "name": {
+        "maxLength": 100,
+        "minLength": 1,
+        "type": "string"
+      },
+      "origin": {
+        "format": "uri",
+        "maxLength": 2560,
+        "type": "string"
+      },
+      "timeoutMs": {
+        "maximum": 30000,
+        "minimum": 1,
+        "type": "integer"
+      }
+    },
+    "required": [
+      "kind",
+      "origin",
+      "name",
+      "arguments",
+      "allowSideEffects"
+    ],
+    "type": "object"
+  }
+]

Changed7 schema fields changedv0.7.0Sep 1, 2026

addedInput schema / definitions

Added value: +{
+  "__schema0": {
+    "anyOf": [
+      {
+        "type": "null"
+      },
+      {
+        "type": "boolean"
+      },
+      {
+        "type": "number"
+      },
+      {
+        "type": "string"
+      },
+      {
+        "items": {
+          "$ref": "#/definitions/__schema0"
+        },
+        "type": "array"
+      },
+      {
+        "additionalProperties": {
+          "$ref": "#/definitions/__schema0"
+        },
+        "propertyNames": {
+          "type": "string"
+        },
+        "type": "object"
+      }
+    ]
+  }
+}

removedInput schema / properties / action / anyOf

Removed value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "kind": {
-        "const": "navigate",
-        "type": "string"
-      },
-      "url": {
-        "format": "uri",
-        "maxLength": 2048,
-        "type": "string"
-      }
-    },
-    "required": [
-      "kind",
-      "url"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "kind": {
-        "const": "click",
-        "type": "string"
-      },
-      "locator": {
-        "oneOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "css",
-                "type": "string"
-              },
-              "value": {
-                "maxLength": 500,
-                "minLength": 1,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "value"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "role",
-                "type": "string"
-              },
-              "name": {
-                "maxLength": 300,
-                "minLength": 1,
-                "type": "string"
-              },
-              "role": {
-                "maxLength": 100,
-                "minLength": 1,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "role"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "text",
-                "type": "string"
-              },
-              "text": {
-                "maxLength": 500,
-                "minLength": 1,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "text"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "label",
-                "type": "string"
-              },
-              "text": {
-                "maxLength": 500,
-                "minLength": 1,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "text"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "testId",
-                "type": "string"
-              },
-              "value": {
-                "maxLength": 500,
-                "minLength": 1,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "value"
-            ],
-            "type": "object"
-          }
-        ]
-      }
-    },
-    "required": [
-      "kind",
-      "locator"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "kind": {
-        "const": "fill",
-        "type": "string"
-      },
-      "locator": {
-        "oneOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "css",
-                "type": "string"
-              },
-              "value": {
-                "maxLength": 500,
-                "minLength": 1,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "value"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "role",
-                "type": "string"
-              },
-              "name": {
-                "maxLength": 300,
-                "minLength": 1,
-                "type": "string"
-              },
-              "role": {
-                "maxLength": 100,
-                "minLength": 1,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "role"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "text",
-                "type": "string"
-              },
-              "text": {
-                "maxLength": 500,
-                "minLength": 1,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "text"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "label",
-                "type": "string"
-              },
-              "text": {
-                "maxLength": 500,
-                "minLength": 1,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "text"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "testId",
-                "type": "string"
-              },
-              "value": {
-                "maxLength": 500,
-                "minLength": 1,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "value"
-            ],
-            "type": "object"
-          }
-        ]
-      },
-      "value": {
-        "maxLength": 10000,
-        "type": "string"
-      }
-    },
-    "required": [
-      "kind",
-      "locator",
-      "value"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "key": {
-        "enum": [
-          "Enter",
-          "Escape",
-          "Tab",
-          "ArrowUp",
-          "ArrowDown",
-          "ArrowLeft",
-          "ArrowRight",
-          "Backspace",
-          "Delete",
-          "Space"
-        ],
-        "type": "string"
-      },
-      "kind": {
-        "const": "press",
-        "type": "string"
-      },
-      "locator": {
-        "oneOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "css",
-                "type": "string"
-              },
-              "value": {
-                "maxLength": 500,
-                "minLength": 1,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "value"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "role",
-                "type": "string"
-              },
-              "name": {
-                "maxLength": 300,
-                "minLength": 1,
-                "type": "string"
-              },
-              "role": {
-                "maxLength": 100,
-                "minLength": 1,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "role"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "text",
-                "type": "string"
-              },
-              "text": {
-                "maxLength": 500,
-                "minLength": 1,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "text"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "label",
-                "type": "string"
-              },
-              "text": {
-                "maxLength": 500,
-                "minLength": 1,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "text"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "testId",
-                "type": "string"
-              },
-              "value": {
-                "maxLength": 500,
-                "minLength": 1,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "value"
-            ],
-            "type": "object"
-          }
-        ]
-      }
-    },
-    "required": [
-      "kind",
-      "locator",
-      "key"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "kind": {
-        "const": "select",
-        "type": "string"
-      },
-      "locator": {
-        "oneOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "css",
-                "type": "string"
-              },
-              "value": {
-                "maxLength": 500,
-                "minLength": 1,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "value"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "role",
-                "type": "string"
-              },
-              "name": {
-                "maxLength": 300,
-                "minLength": 1,
-                "type": "string"
-              },
-              "role": {
-                "maxLength": 100,
-                "minLength": 1,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "role"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "text",
-                "type": "string"
-              },
-              "text": {
-                "maxLength": 500,
-                "minLength": 1,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "text"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "label",
-                "type": "string"
-              },
-              "text": {
-                "maxLength": 500,
-                "minLength": 1,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "text"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "testId",
-                "type": "string"
-              },
-              "value": {
-                "maxLength": 500,
-                "minLength": 1,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "value"
-            ],
-            "type": "object"
-          }
-        ]
-      },
-      "value": {
-        "maxLength": 500,
-        "minLength": 1,
-        "type": "string"
-      }
-    },
-    "required": [
-      "kind",
-      "locator",
-      "value"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "checked": {
-        "type": "boolean"
-      },
-      "kind": {
-        "const": "check",
-        "type": "string"
-      },
-      "locator": {
-        "oneOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "css",
-                "type": "string"
-              },
-              "value": {
-                "maxLength": 500,
-                "minLength": 1,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "value"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "role",
-                "type": "string"
-              },
-              "name": {
-                "maxLength": 300,
-                "minLength": 1,
-                "type": "string"
-              },
-              "role": {
-                "maxLength": 100,
-                "minLength": 1,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "role"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "text",
-                "type": "string"
-              },
-              "text": {
-                "maxLength": 500,
-                "minLength": 1,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "text"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "label",
-                "type": "string"
-              },
-              "text": {
-                "maxLength": 500,
-                "minLength": 1,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "text"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "testId",
-                "type": "string"
-              },
-              "value": {
-                "maxLength": 500,
-                "minLength": 1,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "value"
-            ],
-            "type": "object"
-          }
-        ]
-      }
-    },
-    "required": [
-      "kind",
-      "locator",
-      "checked"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "kind": {
-        "const": "hover",
-        "type": "string"
-      },
-      "locator": {
-        "oneOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "css",
-                "type": "string"
-              },
-              "value": {
-                "maxLength": 500,
-                "minLength": 1,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "value"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "role",
-                "type": "string"
-              },
-              "name": {
-                "maxLength": 300,
-                "minLength": 1,
-                "type": "string"
-              },
-              "role": {
-                "maxLength": 100,
-                "minLength": 1,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "role"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "text",
-                "type": "string"
-              },
-              "text": {
-                "maxLength": 500,
-                "minLength": 1,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "text"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "label",
-                "type": "string"
-              },
-              "text": {
-                "maxLength": 500,
-                "minLength": 1,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "text"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "testId",
-                "type": "string"
-              },
-              "value": {
-                "maxLength": 500,
-                "minLength": 1,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "value"
-            ],
-            "type": "object"
-          }
-        ]
-      }
-    },
-    "required": [
-      "kind",
-      "locator"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "kind": {
-        "const": "scroll",
-        "type": "string"
-      },
-      "locator": {
-        "oneOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "css",
-                "type": "string"
-              },
-              "value": {
-                "maxLength": 500,
-                "minLength": 1,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "value"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "role",
-                "type": "string"
-              },
-              "name": {
-                "maxLength": 300,
-                "minLength": 1,
-                "type": "string"
-              },
-              "role": {
-                "maxLength": 100,
-                "minLength": 1,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "role"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "text",
-                "type": "string"
-              },
-              "text": {
-                "maxLength": 500,
-                "minLength": 1,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "text"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "label",
-                "type": "string"
-              },
-              "text": {
-                "maxLength": 500,
-                "minLength": 1,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "text"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "testId",
-                "type": "string"
-              },
-              "value": {
-                "maxLength": 500,
-                "minLength": 1,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "value"
-            ],
-            "type": "object"
-          }
-        ]
-      }
-    },
-    "required": [
-      "kind",
-      "locator"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "expected": {
-        "anyOf": [
-          {
-            "maxLength": 500,
-            "type": "string"
-          },
-          {
-            "type": "number"
-          },
-          {
-            "type": "boolean"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "kind": {
-        "const": "wait",
-        "type": "string"
-      },
-      "locator": {
-        "oneOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "css",
-                "type": "string"
-              },
-              "value": {
-                "maxLength": 500,
-                "minLength": 1,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "value"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "role",
-                "type": "string"
-              },
-              "name": {
-                "maxLength": 300,
-                "minLength": 1,
-                "type": "string"
-              },
-              "role": {
-                "maxLength": 100,
-                "minLength": 1,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "role"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "text",
-                "type": "string"
-              },
-              "text": {
-                "maxLength": 500,
-                "minLength": 1,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "text"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "label",
-                "type": "string"
-              },
-              "text": {
-                "maxLength": 500,
-                "minLength": 1,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "text"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "kind": {
-                "const": "testId",
-                "type": "string"
-              },
-              "value": {
-                "maxLength": 500,
-                "minLength": 1,
-                "type": "string"
-              }
-            },
-            "required": [
-              "kind",
-              "value"
-            ],
-            "type": "object"
-          }
-        ]
-      },
-      "property": {
-        "enum": [
-          "count",
-          "visible",
-          "enabled",
-          "checked",
-          "text"
-        ],
-        "type": "string"
-      },
-      "timeoutMs": {
-        "maximum": 30000,
-        "minimum": 0,
-        "type": "integer"
-      }
-    },
-    "required": [
-      "kind",
-      "locator",
-      "property",
-      "expected"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "kind": {
-        "const": "reload",
-        "type": "string"
-      }
-    },
-    "required": [
-      "kind"
-    ],
-    "type": "object"
-  }
-]

addedInput schema / properties / action / oneOf

Added value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "kind": {
+        "const": "navigate",
+        "type": "string"
+      },
+      "url": {
+        "maxLength": 2560,
+        "type": "string"
+      }
+    },
+    "required": [
+      "kind",
+      "url"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "kind": {
+        "const": "click",
+        "type": "string"
+      },
+      "locator": {
+        "oneOf": [
+          {
+            "additionalProperties": false,
+            "properties": {
+              "kind": {
+                "const": "css",
+                "type": "string"
+              },
+              "value": {
+                "maxLength": 500,
+                "type": "string"
+              }
+            },
+            "required": [
+              "kind",
+              "value"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "kind": {
+                "const": "role",
+                "type": "string"
+              },
+              "name": {
+                "maxLength": 300,
+                "type": "string"
+              },
+              "role": {
+                "maxLength": 100,
+                "type": "string"
+              }
+            },
+            "required": [
+              "kind",
+              "role"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "kind": {
+                "const": "text",
+                "type": "string"
+              },
+              "text": {
+                "maxLength": 500,
+                "type": "string"
+              }
+            },
+            "required": [
+              "kind",
+              "text"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "kind": {
+                "const": "label",
+                "type": "string"
+              },
+              "text": {
+                "maxLength": 500,
+                "type": "string"
+              }
+            },
+            "required": [
+              "kind",
+              "text"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "kind": {
+                "const": "testId",
+                "type": "string"
+              },
+              "value": {
+                "maxLength": 500,
+                "type": "string"
+              }
+            },
+            "required": [
+              "kind",
+              "value"
+            ],
+            "type": "object"
+          }
+        ]
+      }
+    },
+    "required": [
+      "kind",
+      "locator"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "kind": {
+        "const": "fill",
+        "type": "string"
+      },
+      "locator": {
+        "oneOf": [
+          {
+            "additionalProperties": false,
+            "properties": {
+              "kind": {
+                "const": "css",
+                "type": "string"
+              },
+              "value": {
+                "maxLength": 500,
+                "type": "string"
+              }
+            },
+            "required": [
+              "kind",
+              "value"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "kind": {
+                "const": "role",
+                "type": "string"
+              },
+              "name": {
+                "maxLength": 300,
+                "type": "string"
+              },
+              "role": {
+                "maxLength": 100,
+                "type": "string"
+              }
+            },
+            "required": [
+              "kind",
+              "role"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "kind": {
+                "const": "text",
+                "type": "string"
+              },
+              "text": {
+                "maxLength": 500,
+                "type": "string"
+              }
+            },
+            "required": [
+              "kind",
+              "text"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "kind": {
+                "const": "label",
+                "type": "string"
+              },
+              "text": {
+                "maxLength": 500,
+                "type": "string"
+              }
+            },
+            "required": [
+              "kind",
+              "text"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "kind": {
+                "const": "testId",
+                "type": "string"
+              },
+              "value": {
+                "maxLength": 500,
+                "type": "string"
+              }
+            },
+            "required": [
+              "kind",
+              "value"
+            ],
+            "type": "object"
+          }
+        ]
+      },
+      "value": {
+        "type": "string"
+      }
+    },
+    "required": [
+      "kind",
+      "locator",
+      "value"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "key": {
+        "maxLength": 40,
+        "type": "string"
+      },
+      "kind": {
+        "const": "press",
+        "type": "string"
+      },
+      "locator": {
+        "oneOf": [
+          {
+            "additionalProperties": false,
+            "properties": {
+              "kind": {
+                "const": "css",
+                "type": "string"
+              },
+              "value": {
+                "maxLength": 500,
+                "type": "string"
+              }
+            },
+            "required": [
+              "kind",
+              "value"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "kind": {
+                "const": "role",
+                "type": "string"
+              },
+              "name": {
+                "maxLength": 300,
+                "type": "string"
+              },
+              "role": {
+                "maxLength": 100,
+                "type": "string"
+              }
+            },
+            "required": [
+              "kind",
+              "role"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "kind": {
+                "const": "text",
+                "type": "string"
+              },
+              "text": {
+                "maxLength": 500,
+                "type": "string"
+              }
+            },
+            "required": [
+              "kind",
+              "text"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "kind": {
+                "const": "label",
+                "type": "string"
+              },
+              "text": {
+                "maxLength": 500,
+                "type": "string"
+              }
+            },
+            "required": [
+              "kind",
+              "text"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "kind": {
+                "const": "testId",
+                "type": "string"
+              },
+              "value": {
+                "maxLength": 500,
+                "type": "string"
+              }
+            },
+            "required": [
+              "kind",
+              "value"
+            ],
+            "type": "object"
+          }
+        ]
+      }
+    },
+    "required": [
+      "kind",
+      "locator",
+      "key"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "kind": {
+        "const": "select",
+        "type": "string"
+      },
+      "locator": {
+        "oneOf": [
+          {
+            "additionalProperties": false,
+            "properties": {
+              "kind": {
+                "const": "css",
+                "type": "string"
+              },
+              "value": {
+                "maxLength": 500,
+                "type": "string"
+              }
+            },
+            "required": [
+              "kind",
+              "value"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "kind": {
+                "const": "role",
+                "type": "string"
+              },
+              "name": {
+                "maxLength": 300,
+                "type": "string"
+              },
+              "role": {
+                "maxLength": 100,
+                "type": "string"
+              }
+            },
+            "required": [
+              "kind",
+              "role"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "kind": {
+                "const": "text",
+                "type": "string"
+              },
+              "text": {
+                "maxLength": 500,
+                "type": "string"
+              }
+            },
+            "required": [
+              "kind",
+              "text"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "kind": {
+                "const": "label",
+                "type": "string"
+              },
+              "text": {
+                "maxLength": 500,
+                "type": "string"
+              }
+            },
+            "required": [
+              "kind",
+              "text"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "kind": {
+                "const": "testId",
+                "type": "string"
+              },
+              "value": {
+                "maxLength": 500,
+                "type": "string"
+              }
+            },
+            "required": [
+              "kind",
+              "value"
+            ],
+            "type": "object"
+          }
+        ]
+      },
+      "value": {
+        "type": "string"
+      }
+    },
+    "required": [
+      "kind",
+      "locator",
+      "value"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "checked": {
+        "type": "boolean"
+      },
+      "kind": {
+        "const": "check",
+        "type": "string"
+      },
+      "locator": {
+        "oneOf": [
+          {
+            "additionalProperties": false,
+            "properties": {
+              "kind": {
+                "const": "css",
+                "type": "string"
+              },
+              "value": {
+                "maxLength": 500,
+                "type": "string"
+              }
+            },
+            "required": [
+              "kind",
+              "value"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "kind": {
+                "const": "role",
+                "type": "string"
+              },
+              "name": {
+                "maxLength": 300,
+                "type": "string"
+              },
+              "role": {
+                "maxLength": 100,
+                "type": "string"
+              }
+            },
+            "required": [
+              "kind",
+              "role"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "kind": {
+                "const": "text",
+                "type": "string"
+              },
+              "text": {
+                "maxLength": 500,
+                "type": "string"
+              }
+            },
+            "required": [
+              "kind",
+              "text"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "kind": {
+                "const": "label",
+                "type": "string"
+              },
+              "text": {
+                "maxLength": 500,
+                "type": "string"
+              }
+            },
+            "required": [
+              "kind",
+              "text"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "kind": {
+                "const": "testId",
+                "type": "string"
+              },
+              "value": {
+                "maxLength": 500,
+                "type": "string"
+              }
+            },
+            "required": [
+              "kind",
+              "value"
+            ],
+            "type": "object"
+          }
+        ]
+      }
+    },
+    "required": [
+      "kind",
+      "locator",
+      "checked"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "kind": {
+        "const": "hover",
+        "type": "string"
+      },
+      "locator": {
+        "oneOf": [
+          {
+            "additionalProperties": false,
+            "properties": {
+              "kind": {
+                "const": "css",
+                "type": "string"
+              },
+              "value": {
+                "maxLength": 500,
+                "type": "string"
+              }
+            },
+            "required": [
+              "kind",
+              "value"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "kind": {
+                "const": "role",
+                "type": "string"
+              },
+              "name": {
+                "maxLength": 300,
+                "type": "string"
+              },
+              "role": {
+                "maxLength": 100,
+                "type": "string"
+              }
+            },
+            "required": [
+              "kind",
+              "role"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "kind": {
+                "const": "text",
+                "type": "string"
+              },
+              "text": {
+                "maxLength": 500,
+                "type": "string"
+              }
+            },
+            "required": [
+              "kind",
+              "text"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "kind": {
+                "const": "label",
+                "type": "string"
+              },
+              "text": {
+                "maxLength": 500,
+                "type": "string"
+              }
+            },
+            "required": [
+              "kind",
+              "text"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "kind": {
+                "const": "testId",
+                "type": "string"
+              },
+              "value": {
+                "maxLength": 500,
+                "type": "string"
+              }
+            },
+            "required": [
+              "kind",
+              "value"
+            ],
+            "type": "object"
+          }
+        ]
+      }
+    },
+    "required": [
+      "kind",
+      "locator"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "kind": {
+        "const": "scroll",
+        "type": "string"
+      },
+      "locator": {
+        "oneOf": [
+          {
+            "additionalProperties": false,
+            "properties": {
+              "kind": {
+                "const": "css",
+                "type": "string"
+              },
+              "value": {
+                "maxLength": 500,
+                "type": "string"
+              }
+            },
+            "required": [
+              "kind",
+              "value"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "kind": {
+                "const": "role",
+                "type": "string"
+              },
+              "name": {
+                "maxLength": 300,
+                "type": "string"
+              },
+              "role": {
+                "maxLength": 100,
+                "type": "string"
+              }
+            },
+            "required": [
+              "kind",
+              "role"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "kind": {
+                "const": "text",
+                "type": "string"
+              },
+              "text": {
+                "maxLength": 500,
+                "type": "string"
+              }
+            },
+            "required": [
+              "kind",
+              "text"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "kind": {
+                "const": "label",
+                "type": "string"
+              },
+              "text": {
+                "maxLength": 500,
+                "type": "string"
+              }
+            },
+            "required": [
+              "kind",
+              "text"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "kind": {
+                "const": "testId",
+                "type": "string"
+              },
+              "value": {
+                "maxLength": 500,
+                "type": "string"
+              }
+            },
+            "required": [
+              "kind",
+              "value"
+            ],
+            "type": "object"
+          }
+        ]
+      }
+    },
+    "required": [
+      "kind",
+      "locator"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "expected": {
+        "anyOf": [
+          {
+            "type": "number"
+          },
+          {
+            "type": "boolean"
+          },
+          {
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "kind": {
+        "const": "wait",
+        "type": "string"
+      },
+      "locator": {
+        "oneOf": [
+          {
+            "additionalProperties": false,
+            "properties": {
+              "kind": {
+                "const": "css",
+                "type": "string"
+              },
+              "value": {
+                "maxLength": 500,
+                "type": "string"
+              }
+            },
+            "required": [
+              "kind",
+              "value"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "kind": {
+                "const": "role",
+                "type": "string"
+              },
+              "name": {
+                "maxLength": 300,
+                "type": "string"
+              },
+              "role": {
+                "maxLength": 100,
+                "type": "string"
+              }
+            },
+            "required": [
+              "kind",
+              "role"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "kind": {
+                "const": "text",
+                "type": "string"
+              },
+              "text": {
+                "maxLength": 500,
+                "type": "string"
+              }
+            },
+            "required": [
+              "kind",
+              "text"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "kind": {
+                "const": "label",
+                "type": "string"
+              },
+              "text": {
+                "maxLength": 500,
+                "type": "string"
+              }
+            },
+            "required": [
+              "kind",
+              "text"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "kind": {
+                "const": "testId",
+                "type": "string"
+              },
+              "value": {
+                "maxLength": 500,
+                "type": "string"
+              }
+            },
+            "required": [
+              "kind",
+              "value"
+            ],
+            "type": "object"
+          }
+        ]
+      },
+      "property": {
+        "enum": [
+          "count",
+          "visible",
+          "enabled",
+          "checked",
+          "text"
+        ],
+        "type": "string"
+      },
+      "timeoutMs": {
+        "maximum": 9007199254740991,
+        "minimum": -9007199254740991,
+        "type": "integer"
+      }
+    },
+    "required": [
+      "kind",
+      "locator",
+      "property",
+      "expected"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "kind": {
+        "const": "reload",
+        "type": "string"
+      }
+    },
+    "required": [
+      "kind"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "allowSideEffects": {
+        "const": true,
+        "type": "boolean"
+      },
+      "arguments": {
+        "additionalProperties": {
+          "$ref": "#/definitions/__schema0"
+        },
+        "propertyNames": {
+          "maxLength": 100,
+          "type": "string"
+        },
+        "type": "object"
+      },
+      "kind": {
+        "const": "webmcp",
+        "type": "string"
+      },
+      "name": {
+        "maxLength": 100,
+        "minLength": 1,
+        "type": "string"
+      },
+      "origin": {
+        "format": "uri",
+        "maxLength": 2560,
+        "type": "string"
+      },
+      "timeoutMs": {
+        "maximum": 30000,
+        "minimum": 1,
+        "type": "integer"
+      }
+    },
+    "required": [
+      "kind",
+      "origin",
+      "name",
+      "arguments",
+      "allowSideEffects"
+    ],
+    "type": "object"
+  }
+]

removedOutput schema / definitions / __schema1

Removed value: -{
-  "anyOf": [
-    {
-      "type": "string"
-    },
-    {
-      "type": "number"
-    },
-    {
-      "type": "boolean"
-    },
-    {
-      "type": "null"
-    },
-    {
-      "items": {
-        "$ref": "#/definitions/__schema1"
-      },
-      "type": "array"
-    },
-    {
-      "additionalProperties": {
-        "$ref": "#/definitions/__schema1"
-      },
-      "propertyNames": {
-        "type": "string"
-      },
-      "type": "object"
-    }
-  ]
-}

removedOutput schema / properties / data / allOf

Removed value: -[
-  {
-    "$ref": "#/definitions/__schema0"
-  }
-]

addedOutput schema / properties / data / oneOf

Added value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "kind": {
+        "enum": [
+          "navigate",
+          "click",
+          "fill",
+          "press",
+          "select",
+          "check",
+          "hover",
+          "scroll",
+          "wait",
+          "reload"
+        ],
+        "type": "string"
+      },
+      "schemaVersion": {
+        "const": 1,
+        "type": "number"
+      },
+      "title": {
+        "maxLength": 300,
+        "type": "string"
+      },
+      "url": {
+        "maxLength": 2560,
+        "type": "string"
+      }
+    },
+    "required": [
+      "schemaVersion",
+      "kind",
+      "url",
+      "title"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "kind": {
+        "const": "webmcp",
+        "type": "string"
+      },
+      "schemaVersion": {
+        "const": 1,
+        "type": "number"
+      },
+      "title": {
+        "maxLength": 300,
+        "type": "string"
+      },
+      "toolResult": {
+        "anyOf": [
+          {
+            "maxLength": 8192,
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "url": {
+        "maxLength": 2560,
+        "type": "string"
+      }
+    },
+    "required": [
+      "schemaVersion",
+      "kind",
+      "url",
+      "title",
+      "toolResult"
+    ],
+    "type": "object"
+  }
+]

changedOutput schema / properties / error / properties / details / allOf

Previous value: -[
-  {
-    "$ref": "#/definitions/__schema1"
-  }
-]New value: +[
+  {
+    "$ref": "#/definitions/__schema0"
+  }
+]

First observedv0.5.0-next.0Aug 30, 2026

TDQS

A3.9/5.0

Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already indicate destructive, non-read-only, non-idempotent, and open-world behavior. The description adds valuable specifics: WebMCP calls are bounded, opaque, non-replayable, and never retried, and only explicitly authorized WebMCP tools may be executed. No contradiction exists between the description and annotations.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is two dense sentences with the action list front-loaded and WebMCP caveats placed second. Every clause contributes useful information, and there is no repetition of schema details or filler.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the complex discriminated-union schema and many sibling tools, the description covers the core domain well but omits explicit guidance on where locators come from and when to choose browser actions over debug or inspection tools. An output schema exists, so return-value details are not necessary here.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0%, so the description must compensate for missing parameter guidance. It partially does by enumerating action kinds and emphasizing exact locators and WebMCP authorization. However, it does not explain the sessionId parameter or the locator subtypes/formats, so parameter semantics remain only partially clarified.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description names the exact resource (browser page) and enumerates the supported action verbs: navigate, click, fill, press, select, check, hover, scroll, wait, reload, and WebMCP. This clearly distinguishes it from the sibling session, inspection, and debug tools. The phrase 'with exact locators' also signals the required input style.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description makes the tool's purpose obvious and mentions executing authorized WebMCP page tools, but it does not explicitly say when to prefer this tool over siblings like web_debug_evaluate or web_next_inspect. Usage context is implied by the action list rather than stated as a decision rule.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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