web-debug-mcp

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Read web debug session status

web_session_status

Read-onlyIdempotent

Check active web-debugging sessions or inspect a single session's summary to confirm project eligibility and negotiated runtime capabilities.

Instructions

List active sessions or read one summary with separate project eligibility and negotiated live runtime capabilities.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`sessionId`	No

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.

Changed5 schema fields changedv0.10.0Sep 8, 2026

addedOutput schema / definitions / BrowserRuntimeCapabilitiesOutput

Added value: +{
+  "additionalProperties": false,
+  "properties": {
+    "accessibility": {
+      "$ref": "#/definitions/RuntimeCapabilityOutput"
+    },
+    "actions": {
+      "$ref": "#/definitions/RuntimeCapabilityOutput"
+    },
+    "authSeeding": {
+      "$ref": "#/definitions/RuntimeCapabilityOutput"
+    },
+    "browser": {
+      "enum": [
+        "chromium",
+        "safari"
+      ],
+      "type": "string"
+    },
+    "console": {
+      "$ref": "#/definitions/RuntimeCapabilityOutput"
+    },
+    "dom": {
+      "$ref": "#/definitions/RuntimeCapabilityOutput"
+    },
+    "evaluation": {
+      "$ref": "#/definitions/RuntimeCapabilityOutput"
+    },
+    "javascriptDebugger": {
+      "$ref": "#/definitions/RuntimeCapabilityOutput"
+    },
+    "locators": {
+      "additionalProperties": false,
+      "properties": {
+        "css": {
+          "$ref": "#/definitions/RuntimeCapabilityOutput"
+        },
+        "semantic": {
+          "$ref": "#/definitions/RuntimeCapabilityOutput"
+        }
+      },
+      "required": [
+        "css",
+        "semantic"
+      ],
+      "type": "object"
+    },
+    "network": {
+      "$ref": "#/definitions/RuntimeCapabilityOutput"
+    },
+    "pageRuntimeEnrichment": {
+      "$ref": "#/definitions/RuntimeCapabilityOutput"
+    },
+    "schemaVersion": {
+      "const": 2,
+      "type": "number"
+    },
+    "screenshots": {
+      "$ref": "#/definitions/RuntimeCapabilityOutput"
+    },
+    "tlsBypass": {
+      "$ref": "#/definitions/RuntimeCapabilityOutput"
+    },
+    "transport": {
+      "enum": [
+        "chromium-launch",
+        "chromium-cdp-attach",
+        "safari-webdriver"
+      ],
+      "type": "string"
+    },
+    "viewportMatrix": {
+      "$ref": "#/definitions/RuntimeCapabilityOutput"
+    },
+    "webmcp": {
+      "$ref": "#/definitions/RuntimeCapabilityOutput"
+    }
+  },
+  "required": [
+    "schemaVersion",
+    "browser",
+    "transport",
+    "actions",
+    "locators",
+    "dom",
+    "console",
+    "network",
+    "screenshots",
+    "javascriptDebugger",
+    "evaluation",
+    "accessibility",
+    "pageRuntimeEnrichment",
+    "viewportMatrix",
+    "tlsBypass",
+    "authSeeding",
+    "webmcp"
+  ],
+  "type": "object"
+}

addedOutput schema / definitions / DebugSessionSummaryOutput

Added value: +{
+  "additionalProperties": false,
+  "properties": {
+    "artifactDir": {
+      "maxLength": 4096,
+      "type": "string"
+    },
+    "artifactState": {
+      "enum": [
+        "retained",
+        "deleted"
+      ],
+      "type": "string"
+    },
+    "authFixture": {
+      "enum": [
+        "seeded-disposable",
+        "none"
+      ],
+      "type": "string"
+    },
+    "createdAt": {
+      "maxLength": 100,
+      "type": "string"
+    },
+    "id": {
+      "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)$",
+      "type": "string"
+    },
+    "projectCapabilities": {
+      "$ref": "#/definitions/ProjectCapabilitiesOutput"
+    },
+    "projectRoot": {
+      "maxLength": 4096,
+      "type": "string"
+    },
+    "runtimeCapabilities": {
+      "anyOf": [
+        {
+          "$ref": "#/definitions/BrowserRuntimeCapabilitiesOutput"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "schemaVersion": {
+      "const": 3,
+      "type": "number"
+    },
+    "status": {
+      "enum": [
+        "starting",
+        "ready",
+        "paused",
+        "failed",
+        "closed"
+      ],
+      "type": "string"
+    },
+    "target": {
+      "anyOf": [
+        {
+          "additionalProperties": false,
+          "properties": {
+            "browser": {
+              "enum": [
+                "chromium",
+                "safari"
+              ],
+              "type": "string"
+            },
+            "isolated": {
+              "type": "boolean"
+            },
+            "isolation": {
+              "additionalProperties": false,
+              "properties": {
+                "browserProcess": {
+                  "type": "boolean"
+                },
+                "cache": {
+                  "type": "boolean"
+                },
+                "context": {
+                  "type": "boolean"
+                },
+                "navigation": {
+                  "type": "boolean"
+                },
+                "profile": {
+                  "type": "boolean"
+                },
+                "serverState": {
+                  "type": "boolean"
+                },
+                "serviceWorkers": {
+                  "type": "boolean"
+                },
+                "storage": {
+                  "type": "boolean"
+                }
+              },
+              "required": [
+                "browserProcess",
+                "context",
+                "profile",
+                "storage",
+                "cache",
+                "serviceWorkers",
+                "navigation",
+                "serverState"
+              ],
+              "type": "object"
+            },
+            "mode": {
+              "enum": [
+                "launch",
+                "attach",
+                "webdriver"
+              ],
+              "type": "string"
+            },
+            "remote": {
+              "type": "boolean"
+            },
+            "schemaVersion": {
+              "const": 1,
+              "type": "number"
+            },
+            "targetId": {
+              "maxLength": 200,
+              "type": "string"
+            },
+            "title": {
+              "maxLength": 300,
+              "type": "string"
+            },
+            "url": {
+              "maxLength": 2560,
+              "type": "string"
+            },
+            "viewport": {
+              "anyOf": [
+                {
+                  "additionalProperties": false,
+                  "properties": {
+                    "height": {
+                      "maximum": 9007199254740991,
+                      "minimum": -9007199254740991,
+                      "type": "integer"
+                    },
+                    "width": {
+                      "maximum": 9007199254740991,
+                      "minimum": -9007199254740991,
+                      "type": "integer"
+                    }
+                  },
+                  "required": [
+                    "width",
+                    "height"
+                  ],
+                  "type": "object"
+                },
+                {
+                  "type": "null"
+                }
+              ]
+            }
+          },
+          "required": [
+            "schemaVersion",
+            "browser",
+            "remote",
+            "url",
+            "title",
+            "viewport",
+            "isolated"
+          ],
+          "type": "object"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "tls": {
+      "enum": [
+        "strict",
+        "allow-insecure-loopback"
+      ],
+      "type": "string"
+    },
+    "url": {
+      "maxLength": 2560,
+      "type": "string"
+    },
+    "warnings": {
+      "items": {
+        "maxLength": 500,
+        "type": "string"
+      },
+      "maxItems": 100,
+      "type": "array"
+    }
+  },
+  "required": [
+    "schemaVersion",
+    "id",
+    "projectRoot",
+    "url",
+    "status",
+    "createdAt",
+    "artifactDir",
+    "target",
+    "projectCapabilities",
+    "runtimeCapabilities",
+    "warnings"
+  ],
+  "type": "object"
+}

addedOutput schema / definitions / ProjectCapabilitiesOutput

Added value: +{
+  "additionalProperties": false,
+  "properties": {
+    "angular": {
+      "type": "boolean"
+    },
+    "browserTarget": {
+      "type": "boolean"
+    },
+    "next": {
+      "type": "boolean"
+    },
+    "react": {
+      "type": "boolean"
+    },
+    "serverRuntime": {
+      "type": "boolean"
+    },
+    "vite": {
+      "type": "boolean"
+    },
+    "vue": {
+      "type": "boolean"
+    }
+  },
+  "required": [
+    "browserTarget",
+    "react",
+    "angular",
+    "vue",
+    "vite",
+    "next",
+    "serverRuntime"
+  ],
+  "type": "object"
+}

addedOutput schema / definitions / RuntimeCapabilityOutput

Added value: +{
+  "additionalProperties": false,
+  "properties": {
+    "provenance": {
+      "items": {
+        "enum": [
+          "playwright",
+          "chromium-cdp",
+          "safari-webdriver",
+          "safari-bidi",
+          "performance-resource-timing",
+          "session-policy",
+          "webmcp-page-api"
+        ],
+        "type": "string"
+      },
+      "maxItems": 2,
+      "type": "array"
+    },
+    "reason": {
+      "maxLength": 500,
+      "type": "string"
+    },
+    "state": {
+      "enum": [
+        "supported",
+        "degraded",
+        "unsupported"
+      ],
+      "type": "string"
+    }
+  },
+  "required": [
+    "state",
+    "provenance"
+  ],
+  "type": "object"
+}

changedOutput schema / properties / data / anyOf

Previous value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "artifactDir": {
-        "maxLength": 4096,
-        "type": "string"
-      },
-      "artifactState": {
-        "enum": [
-          "retained",
-          "deleted"
-        ],
-        "type": "string"
-      },
-      "authFixture": {
-        "enum": [
-          "seeded-disposable",
-          "none"
-        ],
-        "type": "string"
-      },
-      "createdAt": {
-        "maxLength": 100,
-        "type": "string"
-      },
-      "id": {
-        "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"
-      },
-      "projectCapabilities": {
-        "additionalProperties": false,
-        "properties": {
-          "angular": {
-            "type": "boolean"
-          },
-          "browserTarget": {
-            "type": "boolean"
-          },
-          "next": {
-            "type": "boolean"
-          },
-          "react": {
-            "type": "boolean"
-          },
-          "serverRuntime": {
-            "type": "boolean"
-          },
-          "vite": {
-            "type": "boolean"
-          },
-          "vue": {
-            "type": "boolean"
-          }
-        },
-        "required": [
-          "browserTarget",
-          "react",
-          "angular",
-          "vue",
-          "vite",
-          "next",
-          "serverRuntime"
-        ],
-        "type": "object"
-      },
-      "projectRoot": {
-        "maxLength": 4096,
-        "type": "string"
-      },
-      "runtimeCapabilities": {
-        "anyOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "accessibility": {
-                "additionalProperties": false,
-                "properties": {
-                  "provenance": {
-                    "items": {
-                      "enum": [
-                        "playwright",
-                        "chromium-cdp",
-                        "safari-webdriver",
-                        "safari-bidi",
-                        "performance-resource-timing",
-                        "session-policy",
-                        "webmcp-page-api"
-                      ],
-                      "type": "string"
-                    },
-                    "maxItems": 2,
-                    "type": "array"
-                  },
-                  "reason": {
-                    "maxLength": 500,
-                    "type": "string"
-                  },
-                  "state": {
-                    "enum": [
-                      "supported",
-                      "degraded",
-                      "unsupported"
-                    ],
-                    "type": "string"
-                  }
-                },
-                "required": [
-                  "state",
-                  "provenance"
-                ],
-                "type": "object"
-              },
-              "actions": {
-                "additionalProperties": false,
-                "properties": {
-                  "provenance": {
-                    "items": {
-                      "enum": [
-                        "playwright",
-                        "chromium-cdp",
-                        "safari-webdriver",
-                        "safari-bidi",
-                        "performance-resource-timing",
-                        "session-policy",
-                        "webmcp-page-api"
-                      ],
-                      "type": "string"
-                    },
-                    "maxItems": 2,
-                    "type": "array"
-                  },
-                  "reason": {
-                    "maxLength": 500,
-                    "type": "string"
-                  },
-                  "state": {
-                    "enum": [
-                      "supported",
-                      "degraded",
-                      "unsupported"
-                    ],
-                    "type": "string"
-                  }
-                },
-                "required": [
-                  "state",
-                  "provenance"
-                ],
-                "type": "object"
-              },
-              "authSeeding": {
-                "additionalProperties": false,
-                "properties": {
-                  "provenance": {
-                    "items": {
-                      "enum": [
-                        "playwright",
-                        "chromium-cdp",
-                        "safari-webdriver",
-                        "safari-bidi",
-                        "performance-resource-timing",
-                        "session-policy",
-                        "webmcp-page-api"
-                      ],
-                      "type": "string"
-                    },
-                    "maxItems": 2,
-                    "type": "array"
-                  },
-                  "reason": {
-                    "maxLength": 500,
-                    "type": "string"
-                  },
-                  "state": {
-                    "enum": [
-                      "supported",
-                      "degraded",
-                      "unsupported"
-                    ],
-                    "type": "string"
-                  }
-                },
-                "required": [
-                  "state",
-                  "provenance"
-                ],
-                "type": "object"
-              },
-              "browser": {
-                "enum": [
-                  "chromium",
-                  "safari"
-                ],
-                "type": "string"
-              },
-              "console": {
-                "additionalProperties": false,
-                "properties": {
-                  "provenance": {
-                    "items": {
-                      "enum": [
-                        "playwright",
-                        "chromium-cdp",
-                        "safari-webdriver",
-                        "safari-bidi",
-                        "performance-resource-timing",
-                        "session-policy",
-                        "webmcp-page-api"
-                      ],
-                      "type": "string"
-                    },
-                    "maxItems": 2,
-                    "type": "array"
-                  },
-                  "reason": {
-                    "maxLength": 500,
-                    "type": "string"
-                  },
-                  "state": {
-                    "enum": [
-                      "supported",
-                      "degraded",
-                      "unsupported"
-                    ],
-                    "type": "string"
-                  }
-                },
-                "required": [
-                  "state",
-                  "provenance"
-                ],
-                "type": "object"
-              },
-              "dom": {
-                "additionalProperties": false,
-                "properties": {
-                  "provenance": {
-                    "items": {
-                      "enum": [
-                        "playwright",
-                        "chromium-cdp",
-                        "safari-webdriver",
-                        "safari-bidi",
-                        "performance-resource-timing",
-                        "session-policy",
-                        "webmcp-page-api"
-                      ],
-                      "type": "string"
-                    },
-                    "maxItems": 2,
-                    "type": "array"
-                  },
-                  "reason": {
-                    "maxLength": 500,
-                    "type": "string"
-                  },
-                  "state": {
-                    "enum": [
-                      "supported",
-                      "degraded",
-                      "unsupported"
-                    ],
-                    "type": "string"
-                  }
-                },
-                "required": [
-                  "state",
-                  "provenance"
-                ],
-                "type": "object"
-              },
-              "evaluation": {
-                "additionalProperties": false,
-                "properties": {
-                  "provenance": {
-                    "items": {
-                      "enum": [
-                        "playwright",
-                        "chromium-cdp",
-                        "safari-webdriver",
-                        "safari-bidi",
-                        "performance-resource-timing",
-                        "session-policy",
-                        "webmcp-page-api"
-                      ],
-                      "type": "string"
-                    },
-                    "maxItems": 2,
-                    "type": "array"
-                  },
-                  "reason": {
-                    "maxLength": 500,
-                    "type": "string"
-                  },
-                  "state": {
-                    "enum": [
-                      "supported",
-                      "degraded",
-                      "unsupported"
-                    ],
-                    "type": "string"
-                  }
-                },
-                "required": [
-                  "state",
-                  "provenance"
-                ],
-                "type": "object"
-              },
-              "javascriptDebugger": {
-                "additionalProperties": false,
-                "properties": {
-                  "provenance": {
-                    "items": {
-                      "enum": [
-                        "playwright",
-                        "chromium-cdp",
-                        "safari-webdriver",
-                        "safari-bidi",
-                        "performance-resource-timing",
-                        "session-policy",
-                        "webmcp-page-api"
-                      ],
-                      "type": "string"
-                    },
-                    "maxItems": 2,
-                    "type": "array"
-                  },
-                  "reason": {
-                    "maxLength": 500,
-                    "type": "string"
-                  },
-                  "state": {
-                    "enum": [
-                      "supported",
-                      "degraded",
-                      "unsupported"
-                    ],
-                    "type": "string"
-                  }
-                },
-                "required": [
-                  "state",
-                  "provenance"
-                ],
-                "type": "object"
-              },
-              "locators": {
-                "additionalProperties": false,
-                "properties": {
-                  "css": {
-                    "additionalProperties": false,
-                    "properties": {
-                      "provenance": {
-                        "items": {
-                          "enum": [
-                            "playwright",
-                            "chromium-cdp",
-                            "safari-webdriver",
-                            "safari-bidi",
-                            "performance-resource-timing",
-                            "session-policy",
-                            "webmcp-page-api"
-                          ],
-                          "type": "string"
-                        },
-                        "maxItems": 2,
-                        "type": "array"
-                      },
-                      "reason": {
-                        "maxLength": 500,
-                        "type": "string"
-                      },
-                      "state": {
-                        "enum": [
-                          "supported",
-                          "degraded",
-                          "unsupported"
-                        ],
-                        "type": "string"
-                      }
-                    },
-                    "required": [
-                      "state",
-                      "provenance"
-                    ],
-                    "type": "object"
-                  },
-                  "semantic": {
-                    "additionalProperties": false,
-                    "properties": {
-                      "provenance": {
-                        "items": {
-                          "enum": [
-                            "playwright",
-                            "chromium-cdp",
-                            "safari-webdriver",
-                            "safari-bidi",
-                            "performance-resource-timing",
-                            "session-policy",
-                            "webmcp-page-api"
-                          ],
-                          "type": "string"
-                        },
-                        "maxItems": 2,
-                        "type": "array"
-                      },
-                      "reason": {
-                        "maxLength": 500,
-                        "type": "string"
-                      },
-                      "state": {
-                        "enum": [
-                          "supported",
-                          "degraded",
-                          "unsupported"
-                        ],
-                        "type": "string"
-                      }
-                    },
-                    "required": [
-                      "state",
-                      "provenance"
-                    ],
-                    "type": "object"
-                  }
-                },
-                "required": [
-                  "css",
-                  "semantic"
-                ],
-                "type": "object"
-              },
-              "network": {
-                "additionalProperties": false,
-                "properties": {
-                  "provenance": {
-                    "items": {
-                      "enum": [
-                        "playwright",
-                        "chromium-cdp",
-                        "safari-webdriver",
-                        "safari-bidi",
-                        "performance-resource-timing",
-                        "session-policy",
-                        "webmcp-page-api"
-                      ],
-                      "type": "string"
-                    },
-                    "maxItems": 2,
-                    "type": "array"
-                  },
-                  "reason": {
-                    "maxLength": 500,
-                    "type": "string"
-                  },
-                  "state": {
-                    "enum": [
-                      "supported",
-                      "degraded",
-                      "unsupported"
-                    ],
-                    "type": "string"
-                  }
-                },
-                "required": [
-                  "state",
-                  "provenance"
-                ],
-                "type": "object"
-              },
-              "pageRuntimeEnrichment": {
-                "additionalProperties": false,
-                "properties": {
-                  "provenance": {
-                    "items": {
-                      "enum": [
-                        "playwright",
-                        "chromium-cdp",
-                        "safari-webdriver",
-                        "safari-bidi",
-                        "performance-resource-timing",
-                        "session-policy",
-                        "webmcp-page-api"
-                      ],
-                      "type": "string"
-                    },
-                    "maxItems": 2,
-                    "type": "array"
-                  },
-                  "reason": {
-                    "maxLength": 500,
-                    "type": "string"
-                  },
-                  "state": {
-                    "enum": [
-                      "supported",
-                      "degraded",
-                      "unsupported"
-                    ],
-                    "type": "string"
-                  }
-                },
-                "required": [
-                  "state",
-                  "provenance"
-                ],
-                "type": "object"
-              },
-              "schemaVersion": {
-                "const": 2,
-                "type": "number"
-              },
-              "screenshots": {
-                "additionalProperties": false,
-                "properties": {
-                  "provenance": {
-                    "items": {
-                      "enum": [
-                        "playwright",
-                        "chromium-cdp",
-                        "safari-webdriver",
-                        "safari-bidi",
-                        "performance-resource-timing",
-                        "session-policy",
-                        "webmcp-page-api"
-                      ],
-                      "type": "string"
-                    },
-                    "maxItems": 2,
-                    "type": "array"
-                  },
-                  "reason": {
-                    "maxLength": 500,
-                    "type": "string"
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-                "webmcp": {
-                  "additionalProperties": false,
-                  "properties": {
-                    "provenance": {
-                      "items": {
-                        "enum": [
-                          "playwright",
-                          "chromium-cdp",
-                          "safari-webdriver",
-                          "safari-bidi",
-                          "performance-resource-timing",
-                          "session-policy",
-                          "webmcp-page-api"
-                        ],
-                        "type": "string"
-                      },
-                      "maxItems": 2,
-                      "type": "array"
-                    },
-                    "reason": {
-                      "maxLength": 500,
-                      "type": "string"
-                    },
-                    "state": {
-                      "enum": [
-                        "supported",
-                        "degraded",
-                        "unsupported"
-                      ],
-                      "type": "string"
-                    }
-                  },
-                  "required": [
-                    "state",
-                    "provenance"
-                  ],
-                  "type": "object"
-                }
-              },
-              "required": [
-                "schemaVersion",
-                "browser",
-                "transport",
-                "actions",
-                "locators",
-                "dom",
-                "console",
-                "network",
-                "screenshots",
-                "javascriptDebugger",
-                "evaluation",
-                "accessibility",
-                "pageRuntimeEnrichment",
-                "viewportMatrix",
-                "tlsBypass",
-                "authSeeding",
-                "webmcp"
-              ],
-              "type": "object"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "schemaVersion": {
-          "const": 3,
-          "type": "number"
-        },
-        "status": {
-          "enum": [
-            "starting",
-            "ready",
-            "paused",
-            "failed",
-            "closed"
-          ],
-          "type": "string"
-        },
-        "target": {
-          "anyOf": [
-            {
-              "additionalProperties": false,
-              "properties": {
-                "browser": {
-                  "enum": [
-                    "chromium",
-                    "safari"
-                  ],
-                  "type": "string"
-                },
-                "isolated": {
-                  "type": "boolean"
-                },
-                "isolation": {
-                  "additionalProperties": false,
-                  "properties": {
-                    "browserProcess": {
-                      "type": "boolean"
-                    },
-                    "cache": {
-                      "type": "boolean"
-                    },
-                    "context": {
-                      "type": "boolean"
-                    },
-                    "navigation": {
-                      "type": "boolean"
-                    },
-                    "profile": {
-                      "type": "boolean"
-                    },
-                    "serverState": {
-                      "type": "boolean"
-                    },
-                    "serviceWorkers": {
-                      "type": "boolean"
-                    },
-                    "storage": {
-                      "type": "boolean"
-                    }
-                  },
-                  "required": [
-                    "browserProcess",
-                    "context",
-                    "profile",
-                    "storage",
-                    "cache",
-                    "serviceWorkers",
-                    "navigation",
-                    "serverState"
-                  ],
-                  "type": "object"
-                },
-                "mode": {
-                  "enum": [
-                    "launch",
-                    "attach",
-                    "webdriver"
-                  ],
-                  "type": "string"
-                },
-                "remote": {
-                  "type": "boolean"
-                },
-                "schemaVersion": {
-                  "const": 1,
-                  "type": "number"
-                },
-                "targetId": {
-                  "maxLength": 200,
-                  "type": "string"
-                },
-                "title": {
-                  "maxLength": 300,
-                  "type": "string"
-                },
-                "url": {
-                  "maxLength": 2560,
-                  "type": "string"
-                },
-                "viewport": {
-                  "anyOf": [
-                    {
-                      "additionalProperties": false,
-                      "properties": {
-                        "height": {
-                          "maximum": 9007199254740991,
-                          "minimum": -9007199254740991,
-                          "type": "integer"
-                        },
-                        "width": {
-                          "maximum": 9007199254740991,
-                          "minimum": -9007199254740991,
-                          "type": "integer"
-                        }
-                      },
-                      "required": [
-                        "width",
-                        "height"
-                      ],
-                      "type": "object"
-                    },
-                    {
-                      "type": "null"
-                    }
-                  ]
-                }
-              },
-              "required": [
-                "schemaVersion",
-                "browser",
-                "remote",
-                "url",
-                "title",
-                "viewport",
-                "isolated"
-              ],
-              "type": "object"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "tls": {
-          "enum": [
-            "strict",
-            "allow-insecure-loopback"
-          ],
-          "type": "string"
-        },
-        "url": {
-          "maxLength": 2560,
-          "type": "string"
-        },
-        "warnings": {
-          "items": {
-            "maxLength": 500,
-            "type": "string"
-          },
-          "maxItems": 100,
-          "type": "array"
-        }
-      },
-      "required": [
-        "schemaVersion",
-        "id",
-        "projectRoot",
-        "url",
-        "status",
-        "createdAt",
-        "artifactDir",
-        "target",
-        "projectCapabilities",
-        "runtimeCapabilities",
-        "warnings"
-      ],
-      "type": "object"
-    },
-    "maxItems": 8,
-    "type": "array"
-  }
-]New value: +[
+  {
+    "$ref": "#/definitions/DebugSessionSummaryOutput"
+  },
+  {
+    "items": {
+      "$ref": "#/definitions/DebugSessionSummaryOutput"
+    },
+    "maxItems": 8,
+    "type": "array"
+  }
+]

Changed4 schema fields changedv0.7.0Sep 1, 2026

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 / anyOf

Added value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "artifactDir": {
+        "maxLength": 4096,
+        "type": "string"
+      },
+      "artifactState": {
+        "enum": [
+          "retained",
+          "deleted"
+        ],
+        "type": "string"
+      },
+      "authFixture": {
+        "enum": [
+          "seeded-disposable",
+          "none"
+        ],
+        "type": "string"
+      },
+      "createdAt": {
+        "maxLength": 100,
+        "type": "string"
+      },
+      "id": {
+        "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"
+      },
+      "projectCapabilities": {
+        "additionalProperties": false,
+        "properties": {
+          "angular": {
+            "type": "boolean"
+          },
+          "browserTarget": {
+            "type": "boolean"
+          },
+          "next": {
+            "type": "boolean"
+          },
+          "react": {
+            "type": "boolean"
+          },
+          "serverRuntime": {
+            "type": "boolean"
+          },
+          "vite": {
+            "type": "boolean"
+          },
+          "vue": {
+            "type": "boolean"
+          }
+        },
+        "required": [
+          "browserTarget",
+          "react",
+          "angular",
+          "vue",
+          "vite",
+          "next",
+          "serverRuntime"
+        ],
+        "type": "object"
+      },
+      "projectRoot": {
+        "maxLength": 4096,
+        "type": "string"
+      },
+      "runtimeCapabilities": {
+        "anyOf": [
+          {
+            "additionalProperties": false,
+            "properties": {
+              "accessibility": {
+                "additionalProperties": false,
+                "properties": {
+                  "provenance": {
+                    "items": {
+                      "enum": [
+                        "playwright",
+                        "chromium-cdp",
+                        "safari-webdriver",
+                        "safari-bidi",
+                        "performance-resource-timing",
+                        "session-policy",
+                        "webmcp-page-api"
+                      ],
+                      "type": "string"
+                    },
+                    "maxItems": 2,
+                    "type": "array"
+                  },
+                  "reason": {
+                    "maxLength": 500,
+                    "type": "string"
+                  },
+                  "state": {
+                    "enum": [
+                      "supported",
+                      "degraded",
+                      "unsupported"
+                    ],
+                    "type": "string"
+                  }
+                },
+                "required": [
+                  "state",
+                  "provenance"
+                ],
+                "type": "object"
+              },
+              "actions": {
+                "additionalProperties": false,
+                "properties": {
+                  "provenance": {
+                    "items": {
+                      "enum": [
+                        "playwright",
+                        "chromium-cdp",
+                        "safari-webdriver",
+                        "safari-bidi",
+                        "performance-resource-timing",
+                        "session-policy",
+                        "webmcp-page-api"
+                      ],
+                      "type": "string"
+                    },
+                    "maxItems": 2,
+                    "type": "array"
+                  },
+                  "reason": {
+                    "maxLength": 500,
+                    "type": "string"
+                  },
+                  "state": {
+                    "enum": [
+                      "supported",
+                      "degraded",
+                      "unsupported"
+                    ],
+                    "type": "string"
+                  }
+                },
+                "required": [
+                  "state",
+                  "provenance"
+                ],
+                "type": "object"
+              },
+              "authSeeding": {
+                "additionalProperties": false,
+                "properties": {
+                  "provenance": {
+                    "items": {
+                      "enum": [
+                        "playwright",
+                        "chromium-cdp",
+                        "safari-webdriver",
+                        "safari-bidi",
+                        "performance-resource-timing",
+                        "session-policy",
+                        "webmcp-page-api"
+                      ],
+                      "type": "string"
+                    },
+                    "maxItems": 2,
+                    "type": "array"
+                  },
+                  "reason": {
+                    "maxLength": 500,
+                    "type": "string"
+                  },
+                  "state": {
+                    "enum": [
+                      "supported",
+                      "degraded",
+                      "unsupported"
+                    ],
+                    "type": "string"
+                  }
+                },
+                "required": [
+                  "state",
+                  "provenance"
+                ],
+                "type": "object"
+              },
+              "browser": {
+                "enum": [
+                  "chromium",
+                  "safari"
+                ],
+                "type": "string"
+              },
+              "console": {
+                "additionalProperties": false,
+                "properties": {
+                  "provenance": {
+                    "items": {
+                      "enum": [
+                        "playwright",
+                        "chromium-cdp",
+                        "safari-webdriver",
+                        "safari-bidi",
+                        "performance-resource-timing",
+                        "session-policy",
+                        "webmcp-page-api"
+                      ],
+                      "type": "string"
+                    },
+                    "maxItems": 2,
+                    "type": "array"
+                  },
+                  "reason": {
+                    "maxLength": 500,
+                    "type": "string"
+                  },
+                  "state": {
+                    "enum": [
+                      "supported",
+                      "degraded",
+                      "unsupported"
+                    ],
+                    "type": "string"
+                  }
+                },
+                "required": [
+                  "state",
+                  "provenance"
+                ],
+                "type": "object"
+              },
+              "dom": {
+                "additionalProperties": false,
+                "properties": {
+                  "provenance": {
+                    "items": {
+                      "enum": [
+                        "playwright",
+                        "chromium-cdp",
+                        "safari-webdriver",
+                        "safari-bidi",
+                        "performance-resource-timing",
+                        "session-policy",
+                        "webmcp-page-api"
+                      ],
+                      "type": "string"
+                    },
+                    "maxItems": 2,
+                    "type": "array"
+                  },
+                  "reason": {
+                    "maxLength": 500,
+                    "type": "string"
+                  },
+                  "state": {
+                    "enum": [
+                      "supported",
+                      "degraded",
+                      "unsupported"
+                    ],
+                    "type": "string"
+                  }
+                },
+                "required": [
+                  "state",
+                  "provenance"
+                ],
+                "type": "object"
+              },
+              "evaluation": {
+                "additionalProperties": false,
+                "properties": {
+                  "provenance": {
+                    "items": {
+                      "enum": [
+                        "playwright",
+                        "chromium-cdp",
+                        "safari-webdriver",
+                        "safari-bidi",
+                        "performance-resource-timing",
+                        "session-policy",
+                        "webmcp-page-api"
+                      ],
+                      "type": "string"
+                    },
+                    "maxItems": 2,
+                    "type": "array"
+                  },
+                  "reason": {
+                    "maxLength": 500,
+                    "type": "string"
+                  },
+                  "state": {
+                    "enum": [
+                      "supported",
+                      "degraded",
+                      "unsupported"
+                    ],
+                    "type": "string"
+                  }
+                },
+                "required": [
+                  "state",
+                  "provenance"
+                ],
+                "type": "object"
+              },
+              "javascriptDebugger": {
+                "additionalProperties": false,
+                "properties": {
+                  "provenance": {
+                    "items": {
+                      "enum": [
+                        "playwright",
+                        "chromium-cdp",
+                        "safari-webdriver",
+                        "safari-bidi",
+                        "performance-resource-timing",
+                        "session-policy",
+                        "webmcp-page-api"
+                      ],
+                      "type": "string"
+                    },
+                    "maxItems": 2,
+                    "type": "array"
+                  },
+                  "reason": {
+                    "maxLength": 500,
+                    "type": "string"
+                  },
+                  "state": {
+                    "enum": [
+                      "supported",
+                      "degraded",
+                      "unsupported"
+                    ],
+                    "type": "string"
+                  }
+                },
+                "required": [
+                  "state",
+                  "provenance"
+                ],
+                "type": "object"
+              },
+              "locators": {
+                "additionalProperties": false,
+                "properties": {
+                  "css": {
+                    "additionalProperties": false,
+                    "properties": {
+                      "provenance": {
+                        "items": {
+                          "enum": [
+                            "playwright",
+                            "chromium-cdp",
+                            "safari-webdriver",
+                            "safari-bidi",
+                            "performance-resource-timing",
+                            "session-policy",
+                            "webmcp-page-api"
+                          ],
+                          "type": "string"
+                        },
+                        "maxItems": 2,
+                        "type": "array"
+                      },
+                      "reason": {
+                        "maxLength": 500,
+                        "type": "string"
+                      },
+                      "state": {
+                        "enum": [
+                          "supported",
+                          "degraded",
+                          "unsupported"
+                        ],
+                        "type": "string"
+                      }
+                    },
+                    "required": [
+                      "state",
+                      "provenance"
+                    ],
+                    "type": "object"
+                  },
+                  "semantic": {
+                    "additionalProperties": false,
+                    "properties": {
+                      "provenance": {
+                        "items": {
+                          "enum": [
+                            "playwright",
+                            "chromium-cdp",
+                            "safari-webdriver",
+                            "safari-bidi",
+                            "performance-resource-timing",
+                            "session-policy",
+                            "webmcp-page-api"
+                          ],
+                          "type": "string"
+                        },
+                        "maxItems": 2,
+                        "type": "array"
+                      },
+                      "reason": {
+                        "maxLength": 500,
+                        "type": "string"
+                      },
+                      "state": {
+                        "enum": [
+                          "supported",
+                          "degraded",
+                          "unsupported"
+                        ],
+                        "type": "string"
+                      }
+                    },
+                    "required": [
+                      "state",
+                      "provenance"
+                    ],
+                    "type": "object"
+                  }
+                },
+                "required": [
+                  "css",
+                  "semantic"
+                ],
+                "type": "object"
+              },
+              "network": {
+                "additionalProperties": false,
+                "properties": {
+                  "provenance": {
+                    "items": {
+                      "enum": [
+                        "playwright",
+                        "chromium-cdp",
+                        "safari-webdriver",
+                        "safari-bidi",
+                        "performance-resource-timing",
+                        "session-policy",
+                        "webmcp-page-api"
+                      ],
+                      "type": "string"
+                    },
+                    "maxItems": 2,
+                    "type": "array"
+                  },
+                  "reason": {
+                    "maxLength": 500,
+                    "type": "string"
+                  },
+                  "state": {
+                    "enum": [
+                      "supported",
+                      "degraded",
+                      "unsupported"
+                    ],
+                    "type": "string"
+                  }
+                },
+                "required": [
+                  "state",
+                  "provenance"
+                ],
+                "type": "object"
+              },
+              "pageRuntimeEnrichment": {
+                "additionalProperties": false,
+                "properties": {
+                  "provenance": {
+                    "items": {
+                      "enum": [
+                        "playwright",
+                        "chromium-cdp",
+                        "safari-webdriver",
+                        "safari-bidi",
+                        "performance-resource-timing",
+                        "session-policy",
+                        "webmcp-page-api"
+                      ],
+                      "type": "string"
+                    },
+                    "maxItems": 2,
+                    "type": "array"
+                  },
+                  "reason": {
+                    "maxLength": 500,
+                    "type": "string"
+                  },
+                  "state": {
+                    "enum": [
+                      "supported",
+                      "degraded",
+                      "unsupported"
+                    ],
+                    "type": "string"
+                  }
+                },
+                "required": [
+                  "state",
+                  "provenance"
+                ],
+                "type": "object"
+              },
+              "schemaVersion": {
+                "const": 2,
+                "type": "number"
+              },
+              "screenshots": {
+                "additionalProperties": false,
+                "properties": {
+                  "provenance": {
+                    "items": {
+                      "enum": [
+                        "playwright",
+                        "chromium-cdp",
+                        "safari-webdriver",
+                        "safari-bidi",
+                        "performance-resource-timing",
+                        "session-policy",
+                        "webmcp-page-api"
+                      ],
+                      "type": "string"
+                    },
+                    "maxItems": 2,
+                    "type": "array"
+                  },
+                  "reason": {
+                    "maxLength": 500,
+                    "type": "string"
+                  },
+                  "state": {
+                    "enum": [
+                      "supported",
+                      "degraded",
+                      "unsupported"
+                    ],
+                    "type": "string"
+                  }
+                },
+                "required": [
+                  "state",
+                  "provenance"
+                ],
+                "type": "object"
+              },
+              "tlsBypass": {
+                "additionalProperties": false,
+                "properties": {
+                  "provenance": {
+                    "items": {
+                      "enum": [
+                        "playwright",
+                        "chromium-cdp",
+                        "safari-webdriver",
+                        "safari-bidi",
+                        "performance-resource-timing",
+                        "session-policy",
+                        "webmcp-page-api"
+                      ],
+                      "type": "string"
+                    },
+                    "maxItems": 2,
+                    "type": "array"
+                  },
+                  "reason": {
+                    "maxLength": 500,
+                    "type": "string"
+                  },
+                  "state": {
+                    "enum": [
+                      "supported",
+                      "degraded",
+                      "unsupported"
+                    ],
+                    "type": "string"
+                  }
+                },
+                "required": [
+                  "state",
+                  "provenance"
+                ],
+                "type": "object"
+              },
+              "transport": {
+                "enum": [
+                  "chromium-launch",
+                  "chromium-cdp-attach",
+                  "safari-webdriver"
+                ],
+                "type": "string"
+              },
+              "viewportMatrix": {
+                "additionalProperties": false,
+                "properties": {
+                  "provenance": {
+                    "items": {
+                      "enum": [
+                        "playwright",
+                        "chromium-cdp",
+                        "safari-webdriver",
+                        "safari-bidi",
+                        "performance-resource-timing",
+                        "session-policy",
+                        "webmcp-page-api"
+                      ],
+                      "type": "string"
+                    },
+                    "maxItems": 2,
+                    "type": "array"
+                  },
+                  "reason": {
+                    "maxLength": 500,
+                    "type": "string"
+                  },
+                  "state": {
+                    "enum": [
+                      "supported",
+                      "degraded",
+                      "unsupported"
+                    ],
+                    "type": "string"
+                  }
+                },
+                "required": [
+                  "state",
+                  "provenance"
+                ],
+                "type": "object"
+              },
+              "webmcp": {
+                "additionalProperties": false,
+                "properties": {
+                  "provenance": {
+                    "items": {
+                      "enum": [
+                        "playwright",
+                        "chromium-cdp",
+                        "safari-webdriver",
+                        "safari-bidi",
+                        "performance-resource-timing",
+                        "session-policy",
+                        "webmcp-page-api"
+                      ],
+                      "type": "string"
+                    },
+                    "maxItems": 2,
+                    "type": "array"
+                  },
+                  "reason": {
+                    "maxLength": 500,
+                    "type": "string"
+                  },
+                  "state": {
+                    "enum": [
+                      "supported",
+                      "degraded",
+                      "unsupported"
+                    ],
+                    "type": "string"
+                  }
+                },
+                "required": [
+                  "state",
+                  "provenance"
+                ],
+                "type": "object"
+              }
+            },
+            "required": [
+              "schemaVersion",
+              "browser",
+              "transport",
+              "actions",
+              "locators",
+              "dom",
+              "console",
+              "network",
+              "screenshots",
+              "javascriptDebugger",
+              "evaluation",
+              "accessibility",
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+                "url": {
+                  "maxLength": 2560,
+                  "type": "string"
+                },
+                "viewport": {
+                  "anyOf": [
+                    {
+                      "additionalProperties": false,
+                      "properties": {
+                        "height": {
+                          "maximum": 9007199254740991,
+                          "minimum": -9007199254740991,
+                          "type": "integer"
+                        },
+                        "width": {
+                          "maximum": 9007199254740991,
+                          "minimum": -9007199254740991,
+                          "type": "integer"
+                        }
+                      },
+                      "required": [
+                        "width",
+                        "height"
+                      ],
+                      "type": "object"
+                    },
+                    {
+                      "type": "null"
+                    }
+                  ]
+                }
+              },
+              "required": [
+                "schemaVersion",
+                "browser",
+                "remote",
+                "url",
+                "title",
+                "viewport",
+                "isolated"
+              ],
+              "type": "object"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "tls": {
+          "enum": [
+            "strict",
+            "allow-insecure-loopback"
+          ],
+          "type": "string"
+        },
+        "url": {
+          "maxLength": 2560,
+          "type": "string"
+        },
+        "warnings": {
+          "items": {
+            "maxLength": 500,
+            "type": "string"
+          },
+          "maxItems": 100,
+          "type": "array"
+        }
+      },
+      "required": [
+        "schemaVersion",
+        "id",
+        "projectRoot",
+        "url",
+        "status",
+        "createdAt",
+        "artifactDir",
+        "target",
+        "projectCapabilities",
+        "runtimeCapabilities",
+        "warnings"
+      ],
+      "type": "object"
+    },
+    "maxItems": 8,
+    "type": "array"
+  }
+]

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

A4.3/5.0

Behavior4/5

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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false. The description adds useful behavioral context by mentioning that a summary includes 'separate project eligibility and negotiated live runtime capabilities,' which gives the agent a clearer picture of what the read will return beyond a generic status object.

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?

The description is a single front-loaded sentence with no filler. The phrase 'separate project eligibility and negotiated live runtime capabilities' is dense and somewhat technical, but it packs meaningful output detail without bloating the description.

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

Completeness4/5

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

Given the optional single parameter, strong annotations, and presence of an output schema, the description covers the essential call semantics. It does not explain every nuance of 'project eligibility' or 'negotiated live runtime capabilities,' but the output schema can supply structural details and an agent has enough context to invoke the tool correctly.

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

Parameters4/5

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

The input schema has 0% description coverage, so the description must compensate. It does so by implying that omitting sessionId lists active sessions while providing sessionId reads one summary. This is the key parameter behavior and is communicated effectively, though not spelled out as an explicit conditional.

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 ('web debug session') and the two modes of operation: listing active sessions or reading a single summary. This clearly distinguishes it from sibling tools like web_session_start, web_session_close, and web_debug_control, which perform different actions.

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

Usage Guidelines4/5

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

The description makes the usage context clear: use this tool to list active sessions or read one session summary. It does not explicitly name alternatives or exclusion criteria, but the read-only scope is evident from the verb and title, so an agent can infer when to choose it over mutating sibling tools.

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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