web-debug-mcp

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Perform bounded browser action

web_browser_action

Destructive

Perform an exact-locator browser action or one authorized direct WebMCP page tool; direct WebMCP calls remain opaque, non-replayable and never retried.

Instructions

Perform an exact-locator browser action or one authorized direct WebMCP page tool; direct WebMCP calls remain opaque, non-replayable and never retried. Optional Chromium diagnostics collect request initiators and explicitly selected precise coverage; coverage changes JIT/timing and is excluded from fix verification.

Input Schema

Name	Required	Description	Default
`action`	Yes
`sessionId`	Yes
`diagnostics`	No

Output Schema

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

Schema Changelog

Changes observed during successful MCP inspections.

Changed5 schema fields changedv0.12.0Oct 15, 2026

addedInput schema / properties / diagnostics

Added value: +{
+  "additionalProperties": false,
+  "properties": {
+    "coverage": {
+      "default": false,
+      "type": "boolean"
+    },
+    "settleMs": {
+      "default": 250,
+      "maximum": 5000,
+      "minimum": 0,
+      "type": "integer"
+    }
+  },
+  "type": "object"
+}

addedOutput schema / definitions / ExecutionDiagnosticsOutput

Added value: +{
+  "additionalProperties": false,
+  "properties": {
+    "actionId": {
+      "format": "uuid",
+      "pattern": "^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-8][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}|00000000-0000-0000-0000-000000000000|ffffffff-ffff-ffff-ffff-ffffffffffff)$",
+      "type": "string"
+    },
+    "association": {
+      "const": "temporal-window",
+      "type": "string"
+    },
+    "cleanup": {
+      "const": "complete",
+      "type": "string"
+    },
+    "coverage": {
+      "additionalProperties": false,
+      "properties": {
+        "backendEnd": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "backendStart": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "scripts": {
+          "items": {
+            "additionalProperties": false,
+            "properties": {
+              "functions": {
+                "items": {
+                  "additionalProperties": false,
+                  "properties": {
+                    "blockCoverage": {
+                      "type": "boolean"
+                    },
+                    "name": {
+                      "maxLength": 150,
+                      "type": "string"
+                    },
+                    "ranges": {
+                      "items": {
+                        "additionalProperties": false,
+                        "properties": {
+                          "count": {
+                            "maximum": 9007199254740991,
+                            "minimum": 0,
+                            "type": "integer"
+                          },
+                          "endOffset": {
+                            "maximum": 9007199254740991,
+                            "minimum": 0,
+                            "type": "integer"
+                          },
+                          "source": {
+                            "anyOf": [
+                              {
+                                "$ref": "#/definitions/SourceReferenceOutput"
+                              },
+                              {
+                                "type": "null"
+                              }
+                            ]
+                          },
+                          "startOffset": {
+                            "maximum": 9007199254740991,
+                            "minimum": 0,
+                            "type": "integer"
+                          }
+                        },
+                        "required": [
+                          "startOffset",
+                          "endOffset",
+                          "count",
+                          "source"
+                        ],
+                        "type": "object"
+                      },
+                      "maxItems": 8,
+                      "type": "array"
+                    }
+                  },
+                  "required": [
+                    "name",
+                    "blockCoverage",
+                    "ranges"
+                  ],
+                  "type": "object"
+                },
+                "maxItems": 12,
+                "type": "array"
+              },
+              "hash": {
+                "anyOf": [
+                  {
+                    "maxLength": 128,
+                    "type": "string"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              },
+              "scriptId": {
+                "maxLength": 100,
+                "type": "string"
+              },
+              "url": {
+                "maxLength": 2560,
+                "type": "string"
+              }
+            },
+            "required": [
+              "scriptId",
+              "url",
+              "hash",
+              "functions"
+            ],
+            "type": "object"
+          },
+          "maxItems": 12,
+          "type": "array"
+        },
+        "state": {
+          "enum": [
+            "collected",
+            "not-requested",
+            "unavailable"
+          ],
+          "type": "string"
+        }
+      },
+      "required": [
+        "state",
+        "backendStart",
+        "backendEnd",
+        "scripts"
+      ],
+      "type": "object"
+    },
+    "durationMs": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "react": {
+      "additionalProperties": false,
+      "properties": {
+        "commitsAfter": {
+          "maximum": 9007199254740991,
+          "minimum": 0,
+          "type": "integer"
+        },
+        "commitsBefore": {
+          "maximum": 9007199254740991,
+          "minimum": 0,
+          "type": "integer"
+        }
+      },
+      "required": [
+        "commitsBefore",
+        "commitsAfter"
+      ],
+      "type": "object"
+    },
+    "requests": {
+      "items": {
+        "additionalProperties": false,
+        "properties": {
+          "association": {
+            "enum": [
+              "cdp-initiator",
+              "unavailable"
+            ],
+            "type": "string"
+          },
+          "endMs": {
+            "anyOf": [
+              {
+                "minimum": 0,
+                "type": "number"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "initiator": {
+            "anyOf": [
+              {
+                "$ref": "#/definitions/SourceReferenceOutput"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "initiatorType": {
+            "maxLength": 50,
+            "type": "string"
+          },
+          "method": {
+            "maxLength": 20,
+            "type": "string"
+          },
+          "requestId": {
+            "maxLength": 100,
+            "type": "string"
+          },
+          "startMs": {
+            "minimum": 0,
+            "type": "number"
+          },
+          "status": {
+            "anyOf": [
+              {
+                "type": "number"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "url": {
+            "maxLength": 2560,
+            "type": "string"
+          }
+        },
+        "required": [
+          "requestId",
+          "method",
+          "url",
+          "status",
+          "startMs",
+          "endMs",
+          "initiator",
+          "initiatorType",
+          "association"
+        ],
+        "type": "object"
+      },
+      "maxItems": 30,
+      "type": "array"
+    },
+    "schemaVersion": {
+      "const": 1,
+      "type": "number"
+    },
+    "startedAt": {
+      "maxLength": 100,
+      "type": "string"
+    },
+    "truncated": {
+      "type": "boolean"
+    },
+    "warnings": {
+      "items": {
+        "maxLength": 500,
+        "type": "string"
+      },
+      "maxItems": 10,
+      "type": "array"
+    }
+  },
+  "required": [
+    "schemaVersion",
+    "actionId",
+    "startedAt",
+    "durationMs",
+    "association",
+    "coverage",
+    "requests",
+    "truncated",
+    "cleanup",
+    "warnings"
+  ],
+  "type": "object"
+}

addedOutput schema / definitions / SourceLocationOutput

Added value: +{
+  "additionalProperties": false,
+  "properties": {
+    "column": {
+      "exclusiveMinimum": 0,
+      "maximum": 9007199254740991,
+      "type": "integer"
+    },
+    "line": {
+      "exclusiveMinimum": 0,
+      "maximum": 9007199254740991,
+      "type": "integer"
+    },
+    "url": {
+      "maxLength": 2560,
+      "type": "string"
+    }
+  },
+  "required": [
+    "url",
+    "line",
+    "column"
+  ],
+  "type": "object"
+}

addedOutput schema / definitions / SourceReferenceOutput

Added value: +{
+  "additionalProperties": false,
+  "properties": {
+    "generated": {
+      "$ref": "#/definitions/SourceLocationOutput"
+    },
+    "mapping": {
+      "enum": [
+        "mapped",
+        "unavailable"
+      ],
+      "type": "string"
+    },
+    "original": {
+      "anyOf": [
+        {
+          "$ref": "#/definitions/SourceLocationOutput"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "reason": {
+      "maxLength": 500,
+      "type": "string"
+    },
+    "scriptHash": {
+      "anyOf": [
+        {
+          "maxLength": 128,
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "scriptId": {
+      "maxLength": 100,
+      "type": "string"
+    }
+  },
+  "required": [
+    "scriptId",
+    "scriptHash",
+    "generated",
+    "original",
+    "mapping"
+  ],
+  "type": "object"
+}

changedOutput schema / properties / data / oneOf

Previous 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"
-  }
-]New value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "diagnostics": {
+        "allOf": [
+          {
+            "$ref": "#/definitions/ExecutionDiagnosticsOutput"
+          }
+        ]
+      },
+      "kind": {
+        "enum": [
+          "navigate",
+          "click",
+          "fill",
+          "press",
+          "select",
+          "check",
+          "hover",
+          "scroll",
+          "wait",
+          "reload"
+        ],
+        "type": "string"
+      },
+      "schemaVersion": {
+        "const": 1,
+        "type": "number"
+      },
+      "title": {
+        "maxLength": 300,
+        "type": "string"
+      },
+      "url": {
+        "maxLength": 2560,
+        "type": "string"
+      }
+    },
+    "required": [
+      "schemaVersion",
+      "kind",
+      "url",
+      "title"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "diagnostics": {
+        "allOf": [
+          {
+            "$ref": "#/definitions/ExecutionDiagnosticsOutput"
+          }
+        ]
+      },
+      "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"
+  }
+]

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": {
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First observedv0.5.0-next.0Aug 30, 2026

TDQS

B3.2/5.0

Behavior4/5

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

Annotations already declare destructiveHint=true, readOnlyHint=false, openWorldHint=true, and idempotentHint=false, but the description adds genuinely new traits: WebMCP calls are opaque, non-replayable, and never retried, and coverage diagnostics perturb JIT/timing and are excluded from fix verification. These are non-obvious behavioral caveats that meaningfully extend the annotation profile.

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

Conciseness4/5

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

Two dense sentences with the primary action front-loaded and no filler. The wording is efficient, though the compressed jargon sacrifices some readability for brevity.

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?

An output schema exists, so return values need not be explained, and the behavioral caveats are covered. But given the complexity of eleven action variants and nested locators, the description omits the action vocabulary entirely, leaving the agent to reconstruct the tool's surface from the schema alone.

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

Parameters2/5

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

Schema description coverage is 0% and there are three parameters, one being a large oneOf of eleven action kinds plus nested locator objects. The description touches only 'exact-locator' and the diagnostics coverage flag, leaving sessionId and the entire action taxonomy undocumented in prose, so it fails to compensate for the coverage gap.

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

Purpose4/5

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

States a specific verb ('Perform') and resource ('browser action') plus the WebMCP variant, so the agent knows this executes interactions against a page. However 'exact-locator' and 'authorized direct WebMCP page tool' are dense jargon, and it never enumerates the action kinds (navigate/click/fill/etc.) that are the tool's core, leaving some purpose ambiguity against siblings like web_debug_control.

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

Usage Guidelines2/5

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

The description gives no explicit when-to-use or when-not-to-use guidance relative to alternatives such as web_debug_control, web_debug_evaluate, or web_fix_verify. It only implies usage through behavioral notes ('never retried'), forcing the agent to infer selection criteria from the schema.

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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