{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://modelcontextprotocol.io/ext-apps/schema.json",
  "title": "MCP Apps Protocol",
  "description": "JSON Schema for MCP Apps UI protocol messages",
  "$defs": {
    "McpUiAppCapabilities": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "type": "object",
      "properties": {
        "experimental": {
          "description": "Experimental features (structure TBD).",
          "type": "object",
          "properties": {},
          "additionalProperties": false
        },
        "tools": {
          "description": "App exposes MCP-style tools that the host can call.",
          "type": "object",
          "properties": {
            "listChanged": {
              "description": "App supports tools/list_changed notifications.",
              "type": "boolean"
            }
          },
          "additionalProperties": false
        }
      },
      "additionalProperties": false
    },
    "McpUiDisplayMode": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "description": "Display mode for UI presentation.",
      "anyOf": [
        {
          "type": "string",
          "const": "inline"
        },
        {
          "type": "string",
          "const": "fullscreen"
        },
        {
          "type": "string",
          "const": "pip"
        }
      ]
    },
    "McpUiHostCapabilities": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "type": "object",
      "properties": {
        "experimental": {
          "description": "Experimental features (structure TBD).",
          "type": "object",
          "properties": {},
          "additionalProperties": false
        },
        "openLinks": {
          "description": "Host supports opening external URLs.",
          "type": "object",
          "properties": {},
          "additionalProperties": false
        },
        "serverTools": {
          "description": "Host can proxy tool calls to the MCP server.",
          "type": "object",
          "properties": {
            "listChanged": {
              "description": "Host supports tools/list_changed notifications.",
              "type": "boolean"
            }
          },
          "additionalProperties": false
        },
        "serverResources": {
          "description": "Host can proxy resource reads to the MCP server.",
          "type": "object",
          "properties": {
            "listChanged": {
              "description": "Host supports resources/list_changed notifications.",
              "type": "boolean"
            }
          },
          "additionalProperties": false
        },
        "logging": {
          "description": "Host accepts log messages.",
          "type": "object",
          "properties": {},
          "additionalProperties": false
        }
      },
      "additionalProperties": false
    },
    "McpUiHostContextChangedNotification": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "type": "object",
      "properties": {
        "method": {
          "type": "string",
          "const": "ui/notifications/host-context-changed"
        },
        "params": {
          "description": "Partial context update containing only changed fields.",
          "type": "object",
          "properties": {
            "toolInfo": {
              "description": "Metadata of the tool call that instantiated this App.",
              "type": "object",
              "properties": {
                "id": {
                  "description": "JSON-RPC id of the tools/call request.",
                  "anyOf": [
                    {
                      "type": "string"
                    },
                    {
                      "type": "integer",
                      "minimum": -9007199254740991,
                      "maximum": 9007199254740991
                    }
                  ]
                },
                "tool": {
                  "description": "Tool definition including name, inputSchema, etc.",
                  "type": "object",
                  "properties": {
                    "name": {
                      "type": "string"
                    },
                    "title": {
                      "type": "string"
                    },
                    "icons": {
                      "type": "array",
                      "items": {
                        "type": "object",
                        "properties": {
                          "src": {
                            "type": "string"
                          },
                          "mimeType": {
                            "type": "string"
                          },
                          "sizes": {
                            "type": "array",
                            "items": {
                              "type": "string"
                            }
                          }
                        },
                        "required": ["src"],
                        "additionalProperties": false
                      }
                    },
                    "description": {
                      "type": "string"
                    },
                    "inputSchema": {
                      "type": "object",
                      "properties": {
                        "type": {
                          "type": "string",
                          "const": "object"
                        },
                        "properties": {
                          "type": "object",
                          "propertyNames": {
                            "type": "string"
                          },
                          "additionalProperties": {}
                        },
                        "required": {
                          "type": "array",
                          "items": {
                            "type": "string"
                          }
                        }
                      },
                      "required": ["type"],
                      "additionalProperties": {}
                    },
                    "outputSchema": {
                      "type": "object",
                      "properties": {
                        "type": {
                          "type": "string",
                          "const": "object"
                        },
                        "properties": {
                          "type": "object",
                          "propertyNames": {
                            "type": "string"
                          },
                          "additionalProperties": {}
                        },
                        "required": {
                          "type": "array",
                          "items": {
                            "type": "string"
                          }
                        }
                      },
                      "required": ["type"],
                      "additionalProperties": {}
                    },
                    "annotations": {
                      "type": "object",
                      "properties": {
                        "title": {
                          "type": "string"
                        },
                        "readOnlyHint": {
                          "type": "boolean"
                        },
                        "destructiveHint": {
                          "type": "boolean"
                        },
                        "idempotentHint": {
                          "type": "boolean"
                        },
                        "openWorldHint": {
                          "type": "boolean"
                        }
                      },
                      "additionalProperties": false
                    },
                    "execution": {
                      "type": "object",
                      "properties": {
                        "taskSupport": {
                          "type": "string",
                          "enum": ["required", "optional", "forbidden"]
                        }
                      },
                      "additionalProperties": false
                    },
                    "_meta": {
                      "type": "object",
                      "propertyNames": {
                        "type": "string"
                      },
                      "additionalProperties": {}
                    }
                  },
                  "required": ["name", "inputSchema"],
                  "additionalProperties": false
                }
              },
              "required": ["id", "tool"],
              "additionalProperties": false
            },
            "theme": {
              "description": "Current color theme preference.",
              "anyOf": [
                {
                  "type": "string",
                  "const": "light"
                },
                {
                  "type": "string",
                  "const": "dark"
                }
              ]
            },
            "displayMode": {
              "description": "How the UI is currently displayed.",
              "anyOf": [
                {
                  "type": "string",
                  "const": "inline"
                },
                {
                  "type": "string",
                  "const": "fullscreen"
                },
                {
                  "type": "string",
                  "const": "pip"
                }
              ]
            },
            "availableDisplayModes": {
              "description": "Display modes the host supports.",
              "type": "array",
              "items": {
                "type": "string"
              }
            },
            "viewport": {
              "description": "Current and maximum dimensions available to the UI.",
              "type": "object",
              "properties": {
                "width": {
                  "description": "Current viewport width in pixels.",
                  "type": "number"
                },
                "height": {
                  "description": "Current viewport height in pixels.",
                  "type": "number"
                },
                "maxHeight": {
                  "description": "Maximum available height in pixels (if constrained).",
                  "type": "number"
                },
                "maxWidth": {
                  "description": "Maximum available width in pixels (if constrained).",
                  "type": "number"
                }
              },
              "required": ["width", "height"],
              "additionalProperties": false
            },
            "locale": {
              "description": "User's language and region preference in BCP 47 format.",
              "type": "string"
            },
            "timeZone": {
              "description": "User's timezone in IANA format.",
              "type": "string"
            },
            "userAgent": {
              "description": "Host application identifier.",
              "type": "string"
            },
            "platform": {
              "description": "Platform type for responsive design decisions.",
              "anyOf": [
                {
                  "type": "string",
                  "const": "web"
                },
                {
                  "type": "string",
                  "const": "desktop"
                },
                {
                  "type": "string",
                  "const": "mobile"
                }
              ]
            },
            "deviceCapabilities": {
              "description": "Device input capabilities.",
              "type": "object",
              "properties": {
                "touch": {
                  "description": "Whether the device supports touch input.",
                  "type": "boolean"
                },
                "hover": {
                  "description": "Whether the device supports hover interactions.",
                  "type": "boolean"
                }
              },
              "additionalProperties": false
            },
            "safeAreaInsets": {
              "description": "Mobile safe area boundaries in pixels.",
              "type": "object",
              "properties": {
                "top": {
                  "description": "Top safe area inset in pixels.",
                  "type": "number"
                },
                "right": {
                  "description": "Right safe area inset in pixels.",
                  "type": "number"
                },
                "bottom": {
                  "description": "Bottom safe area inset in pixels.",
                  "type": "number"
                },
                "left": {
                  "description": "Left safe area inset in pixels.",
                  "type": "number"
                }
              },
              "required": ["top", "right", "bottom", "left"],
              "additionalProperties": false
            }
          },
          "additionalProperties": false
        }
      },
      "required": ["method", "params"],
      "additionalProperties": false
    },
    "McpUiHostContext": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "type": "object",
      "properties": {
        "toolInfo": {
          "description": "Metadata of the tool call that instantiated this App.",
          "type": "object",
          "properties": {
            "id": {
              "description": "JSON-RPC id of the tools/call request.",
              "anyOf": [
                {
                  "type": "string"
                },
                {
                  "type": "integer",
                  "minimum": -9007199254740991,
                  "maximum": 9007199254740991
                }
              ]
            },
            "tool": {
              "description": "Tool definition including name, inputSchema, etc.",
              "type": "object",
              "properties": {
                "name": {
                  "type": "string"
                },
                "title": {
                  "type": "string"
                },
                "icons": {
                  "type": "array",
                  "items": {
                    "type": "object",
                    "properties": {
                      "src": {
                        "type": "string"
                      },
                      "mimeType": {
                        "type": "string"
                      },
                      "sizes": {
                        "type": "array",
                        "items": {
                          "type": "string"
                        }
                      }
                    },
                    "required": ["src"],
                    "additionalProperties": false
                  }
                },
                "description": {
                  "type": "string"
                },
                "inputSchema": {
                  "type": "object",
                  "properties": {
                    "type": {
                      "type": "string",
                      "const": "object"
                    },
                    "properties": {
                      "type": "object",
                      "propertyNames": {
                        "type": "string"
                      },
                      "additionalProperties": {}
                    },
                    "required": {
                      "type": "array",
                      "items": {
                        "type": "string"
                      }
                    }
                  },
                  "required": ["type"],
                  "additionalProperties": {}
                },
                "outputSchema": {
                  "type": "object",
                  "properties": {
                    "type": {
                      "type": "string",
                      "const": "object"
                    },
                    "properties": {
                      "type": "object",
                      "propertyNames": {
                        "type": "string"
                      },
                      "additionalProperties": {}
                    },
                    "required": {
                      "type": "array",
                      "items": {
                        "type": "string"
                      }
                    }
                  },
                  "required": ["type"],
                  "additionalProperties": {}
                },
                "annotations": {
                  "type": "object",
                  "properties": {
                    "title": {
                      "type": "string"
                    },
                    "readOnlyHint": {
                      "type": "boolean"
                    },
                    "destructiveHint": {
                      "type": "boolean"
                    },
                    "idempotentHint": {
                      "type": "boolean"
                    },
                    "openWorldHint": {
                      "type": "boolean"
                    }
                  },
                  "additionalProperties": false
                },
                "execution": {
                  "type": "object",
                  "properties": {
                    "taskSupport": {
                      "type": "string",
                      "enum": ["required", "optional", "forbidden"]
                    }
                  },
                  "additionalProperties": false
                },
                "_meta": {
                  "type": "object",
                  "propertyNames": {
                    "type": "string"
                  },
                  "additionalProperties": {}
                }
              },
              "required": ["name", "inputSchema"],
              "additionalProperties": false
            }
          },
          "required": ["id", "tool"],
          "additionalProperties": false
        },
        "theme": {
          "description": "Current color theme preference.",
          "anyOf": [
            {
              "type": "string",
              "const": "light"
            },
            {
              "type": "string",
              "const": "dark"
            }
          ]
        },
        "displayMode": {
          "description": "How the UI is currently displayed.",
          "anyOf": [
            {
              "type": "string",
              "const": "inline"
            },
            {
              "type": "string",
              "const": "fullscreen"
            },
            {
              "type": "string",
              "const": "pip"
            }
          ]
        },
        "availableDisplayModes": {
          "description": "Display modes the host supports.",
          "type": "array",
          "items": {
            "type": "string"
          }
        },
        "viewport": {
          "description": "Current and maximum dimensions available to the UI.",
          "type": "object",
          "properties": {
            "width": {
              "description": "Current viewport width in pixels.",
              "type": "number"
            },
            "height": {
              "description": "Current viewport height in pixels.",
              "type": "number"
            },
            "maxHeight": {
              "description": "Maximum available height in pixels (if constrained).",
              "type": "number"
            },
            "maxWidth": {
              "description": "Maximum available width in pixels (if constrained).",
              "type": "number"
            }
          },
          "required": ["width", "height"],
          "additionalProperties": false
        },
        "locale": {
          "description": "User's language and region preference in BCP 47 format.",
          "type": "string"
        },
        "timeZone": {
          "description": "User's timezone in IANA format.",
          "type": "string"
        },
        "userAgent": {
          "description": "Host application identifier.",
          "type": "string"
        },
        "platform": {
          "description": "Platform type for responsive design decisions.",
          "anyOf": [
            {
              "type": "string",
              "const": "web"
            },
            {
              "type": "string",
              "const": "desktop"
            },
            {
              "type": "string",
              "const": "mobile"
            }
          ]
        },
        "deviceCapabilities": {
          "description": "Device input capabilities.",
          "type": "object",
          "properties": {
            "touch": {
              "description": "Whether the device supports touch input.",
              "type": "boolean"
            },
            "hover": {
              "description": "Whether the device supports hover interactions.",
              "type": "boolean"
            }
          },
          "additionalProperties": false
        },
        "safeAreaInsets": {
          "description": "Mobile safe area boundaries in pixels.",
          "type": "object",
          "properties": {
            "top": {
              "description": "Top safe area inset in pixels.",
              "type": "number"
            },
            "right": {
              "description": "Right safe area inset in pixels.",
              "type": "number"
            },
            "bottom": {
              "description": "Bottom safe area inset in pixels.",
              "type": "number"
            },
            "left": {
              "description": "Left safe area inset in pixels.",
              "type": "number"
            }
          },
          "required": ["top", "right", "bottom", "left"],
          "additionalProperties": false
        }
      },
      "additionalProperties": false
    },
    "McpUiInitializeRequest": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "type": "object",
      "properties": {
        "method": {
          "type": "string",
          "const": "ui/initialize"
        },
        "params": {
          "type": "object",
          "properties": {
            "appInfo": {
              "description": "App identification (name and version).",
              "type": "object",
              "properties": {
                "name": {
                  "type": "string"
                },
                "title": {
                  "type": "string"
                },
                "icons": {
                  "type": "array",
                  "items": {
                    "type": "object",
                    "properties": {
                      "src": {
                        "type": "string"
                      },
                      "mimeType": {
                        "type": "string"
                      },
                      "sizes": {
                        "type": "array",
                        "items": {
                          "type": "string"
                        }
                      }
                    },
                    "required": ["src"],
                    "additionalProperties": false
                  }
                },
                "version": {
                  "type": "string"
                },
                "websiteUrl": {
                  "type": "string"
                }
              },
              "required": ["name", "version"],
              "additionalProperties": false
            },
            "appCapabilities": {
              "description": "Features and capabilities this app provides.",
              "type": "object",
              "properties": {
                "experimental": {
                  "description": "Experimental features (structure TBD).",
                  "type": "object",
                  "properties": {},
                  "additionalProperties": false
                },
                "tools": {
                  "description": "App exposes MCP-style tools that the host can call.",
                  "type": "object",
                  "properties": {
                    "listChanged": {
                      "description": "App supports tools/list_changed notifications.",
                      "type": "boolean"
                    }
                  },
                  "additionalProperties": false
                }
              },
              "additionalProperties": false
            },
            "protocolVersion": {
              "description": "Protocol version this app supports.",
              "type": "string"
            }
          },
          "required": ["appInfo", "appCapabilities", "protocolVersion"],
          "additionalProperties": false
        }
      },
      "required": ["method", "params"],
      "additionalProperties": false
    },
    "McpUiInitializeResult": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "type": "object",
      "properties": {
        "protocolVersion": {
          "description": "Negotiated protocol version string (e.g., \"2025-11-21\").",
          "type": "string"
        },
        "hostInfo": {
          "description": "Host application identification and version.",
          "type": "object",
          "properties": {
            "name": {
              "type": "string"
            },
            "title": {
              "type": "string"
            },
            "icons": {
              "type": "array",
              "items": {
                "type": "object",
                "properties": {
                  "src": {
                    "type": "string"
                  },
                  "mimeType": {
                    "type": "string"
                  },
                  "sizes": {
                    "type": "array",
                    "items": {
                      "type": "string"
                    }
                  }
                },
                "required": ["src"],
                "additionalProperties": false
              }
            },
            "version": {
              "type": "string"
            },
            "websiteUrl": {
              "type": "string"
            }
          },
          "required": ["name", "version"],
          "additionalProperties": false
        },
        "hostCapabilities": {
          "description": "Features and capabilities provided by the host.",
          "type": "object",
          "properties": {
            "experimental": {
              "description": "Experimental features (structure TBD).",
              "type": "object",
              "properties": {},
              "additionalProperties": false
            },
            "openLinks": {
              "description": "Host supports opening external URLs.",
              "type": "object",
              "properties": {},
              "additionalProperties": false
            },
            "serverTools": {
              "description": "Host can proxy tool calls to the MCP server.",
              "type": "object",
              "properties": {
                "listChanged": {
                  "description": "Host supports tools/list_changed notifications.",
                  "type": "boolean"
                }
              },
              "additionalProperties": false
            },
            "serverResources": {
              "description": "Host can proxy resource reads to the MCP server.",
              "type": "object",
              "properties": {
                "listChanged": {
                  "description": "Host supports resources/list_changed notifications.",
                  "type": "boolean"
                }
              },
              "additionalProperties": false
            },
            "logging": {
              "description": "Host accepts log messages.",
              "type": "object",
              "properties": {},
              "additionalProperties": false
            }
          },
          "additionalProperties": false
        },
        "hostContext": {
          "description": "Rich context about the host environment.",
          "type": "object",
          "properties": {
            "toolInfo": {
              "description": "Metadata of the tool call that instantiated this App.",
              "type": "object",
              "properties": {
                "id": {
                  "description": "JSON-RPC id of the tools/call request.",
                  "anyOf": [
                    {
                      "type": "string"
                    },
                    {
                      "type": "integer",
                      "minimum": -9007199254740991,
                      "maximum": 9007199254740991
                    }
                  ]
                },
                "tool": {
                  "description": "Tool definition including name, inputSchema, etc.",
                  "type": "object",
                  "properties": {
                    "name": {
                      "type": "string"
                    },
                    "title": {
                      "type": "string"
                    },
                    "icons": {
                      "type": "array",
                      "items": {
                        "type": "object",
                        "properties": {
                          "src": {
                            "type": "string"
                          },
                          "mimeType": {
                            "type": "string"
                          },
                          "sizes": {
                            "type": "array",
                            "items": {
                              "type": "string"
                            }
                          }
                        },
                        "required": ["src"],
                        "additionalProperties": false
                      }
                    },
                    "description": {
                      "type": "string"
                    },
                    "inputSchema": {
                      "type": "object",
                      "properties": {
                        "type": {
                          "type": "string",
                          "const": "object"
                        },
                        "properties": {
                          "type": "object",
                          "propertyNames": {
                            "type": "string"
                          },
                          "additionalProperties": {}
                        },
                        "required": {
                          "type": "array",
                          "items": {
                            "type": "string"
                          }
                        }
                      },
                      "required": ["type"],
                      "additionalProperties": {}
                    },
                    "outputSchema": {
                      "type": "object",
                      "properties": {
                        "type": {
                          "type": "string",
                          "const": "object"
                        },
                        "properties": {
                          "type": "object",
                          "propertyNames": {
                            "type": "string"
                          },
                          "additionalProperties": {}
                        },
                        "required": {
                          "type": "array",
                          "items": {
                            "type": "string"
                          }
                        }
                      },
                      "required": ["type"],
                      "additionalProperties": {}
                    },
                    "annotations": {
                      "type": "object",
                      "properties": {
                        "title": {
                          "type": "string"
                        },
                        "readOnlyHint": {
                          "type": "boolean"
                        },
                        "destructiveHint": {
                          "type": "boolean"
                        },
                        "idempotentHint": {
                          "type": "boolean"
                        },
                        "openWorldHint": {
                          "type": "boolean"
                        }
                      },
                      "additionalProperties": false
                    },
                    "execution": {
                      "type": "object",
                      "properties": {
                        "taskSupport": {
                          "type": "string",
                          "enum": ["required", "optional", "forbidden"]
                        }
                      },
                      "additionalProperties": false
                    },
                    "_meta": {
                      "type": "object",
                      "propertyNames": {
                        "type": "string"
                      },
                      "additionalProperties": {}
                    }
                  },
                  "required": ["name", "inputSchema"],
                  "additionalProperties": false
                }
              },
              "required": ["id", "tool"],
              "additionalProperties": false
            },
            "theme": {
              "description": "Current color theme preference.",
              "anyOf": [
                {
                  "type": "string",
                  "const": "light"
                },
                {
                  "type": "string",
                  "const": "dark"
                }
              ]
            },
            "displayMode": {
              "description": "How the UI is currently displayed.",
              "anyOf": [
                {
                  "type": "string",
                  "const": "inline"
                },
                {
                  "type": "string",
                  "const": "fullscreen"
                },
                {
                  "type": "string",
                  "const": "pip"
                }
              ]
            },
            "availableDisplayModes": {
              "description": "Display modes the host supports.",
              "type": "array",
              "items": {
                "type": "string"
              }
            },
            "viewport": {
              "description": "Current and maximum dimensions available to the UI.",
              "type": "object",
              "properties": {
                "width": {
                  "description": "Current viewport width in pixels.",
                  "type": "number"
                },
                "height": {
                  "description": "Current viewport height in pixels.",
                  "type": "number"
                },
                "maxHeight": {
                  "description": "Maximum available height in pixels (if constrained).",
                  "type": "number"
                },
                "maxWidth": {
                  "description": "Maximum available width in pixels (if constrained).",
                  "type": "number"
                }
              },
              "required": ["width", "height"],
              "additionalProperties": false
            },
            "locale": {
              "description": "User's language and region preference in BCP 47 format.",
              "type": "string"
            },
            "timeZone": {
              "description": "User's timezone in IANA format.",
              "type": "string"
            },
            "userAgent": {
              "description": "Host application identifier.",
              "type": "string"
            },
            "platform": {
              "description": "Platform type for responsive design decisions.",
              "anyOf": [
                {
                  "type": "string",
                  "const": "web"
                },
                {
                  "type": "string",
                  "const": "desktop"
                },
                {
                  "type": "string",
                  "const": "mobile"
                }
              ]
            },
            "deviceCapabilities": {
              "description": "Device input capabilities.",
              "type": "object",
              "properties": {
                "touch": {
                  "description": "Whether the device supports touch input.",
                  "type": "boolean"
                },
                "hover": {
                  "description": "Whether the device supports hover interactions.",
                  "type": "boolean"
                }
              },
              "additionalProperties": false
            },
            "safeAreaInsets": {
              "description": "Mobile safe area boundaries in pixels.",
              "type": "object",
              "properties": {
                "top": {
                  "description": "Top safe area inset in pixels.",
                  "type": "number"
                },
                "right": {
                  "description": "Right safe area inset in pixels.",
                  "type": "number"
                },
                "bottom": {
                  "description": "Bottom safe area inset in pixels.",
                  "type": "number"
                },
                "left": {
                  "description": "Left safe area inset in pixels.",
                  "type": "number"
                }
              },
              "required": ["top", "right", "bottom", "left"],
              "additionalProperties": false
            }
          },
          "additionalProperties": false
        }
      },
      "required": [
        "protocolVersion",
        "hostInfo",
        "hostCapabilities",
        "hostContext"
      ],
      "additionalProperties": {}
    },
    "McpUiInitializedNotification": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "type": "object",
      "properties": {
        "method": {
          "type": "string",
          "const": "ui/notifications/initialized"
        },
        "params": {
          "type": "object",
          "properties": {},
          "additionalProperties": false
        }
      },
      "required": ["method"],
      "additionalProperties": false
    },
    "McpUiMessageRequest": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "type": "object",
      "properties": {
        "method": {
          "type": "string",
          "const": "ui/message"
        },
        "params": {
          "type": "object",
          "properties": {
            "role": {
              "description": "Message role, currently only \"user\" is supported.",
              "type": "string",
              "const": "user"
            },
            "content": {
              "description": "Message content blocks (text, image, etc.).",
              "type": "array",
              "items": {
                "anyOf": [
                  {
                    "type": "object",
                    "properties": {
                      "type": {
                        "type": "string",
                        "const": "text"
                      },
                      "text": {
                        "type": "string"
                      },
                      "annotations": {
                        "type": "object",
                        "properties": {
                          "audience": {
                            "type": "array",
                            "items": {
                              "type": "string",
                              "enum": ["user", "assistant"]
                            }
                          },
                          "priority": {
                            "type": "number",
                            "minimum": 0,
                            "maximum": 1
                          },
                          "lastModified": {
                            "type": "string",
                            "format": "date-time",
                            "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d(?::[0-5]\\d(?:\\.\\d+)?)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$"
                          }
                        },
                        "additionalProperties": false
                      },
                      "_meta": {
                        "type": "object",
                        "propertyNames": {
                          "type": "string"
                        },
                        "additionalProperties": {}
                      }
                    },
                    "required": ["type", "text"],
                    "additionalProperties": false
                  },
                  {
                    "type": "object",
                    "properties": {
                      "type": {
                        "type": "string",
                        "const": "image"
                      },
                      "data": {
                        "type": "string"
                      },
                      "mimeType": {
                        "type": "string"
                      },
                      "annotations": {
                        "type": "object",
                        "properties": {
                          "audience": {
                            "type": "array",
                            "items": {
                              "type": "string",
                              "enum": ["user", "assistant"]
                            }
                          },
                          "priority": {
                            "type": "number",
                            "minimum": 0,
                            "maximum": 1
                          },
                          "lastModified": {
                            "type": "string",
                            "format": "date-time",
                            "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d(?::[0-5]\\d(?:\\.\\d+)?)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$"
                          }
                        },
                        "additionalProperties": false
                      },
                      "_meta": {
                        "type": "object",
                        "propertyNames": {
                          "type": "string"
                        },
                        "additionalProperties": {}
                      }
                    },
                    "required": ["type", "data", "mimeType"],
                    "additionalProperties": false
                  },
                  {
                    "type": "object",
                    "properties": {
                      "type": {
                        "type": "string",
                        "const": "audio"
                      },
                      "data": {
                        "type": "string"
                      },
                      "mimeType": {
                        "type": "string"
                      },
                      "annotations": {
                        "type": "object",
                        "properties": {
                          "audience": {
                            "type": "array",
                            "items": {
                              "type": "string",
                              "enum": ["user", "assistant"]
                            }
                          },
                          "priority": {
                            "type": "number",
                            "minimum": 0,
                            "maximum": 1
                          },
                          "lastModified": {
                            "type": "string",
                            "format": "date-time",
                            "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d(?::[0-5]\\d(?:\\.\\d+)?)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$"
                          }
                        },
                        "additionalProperties": false
                      },
                      "_meta": {
                        "type": "object",
                        "propertyNames": {
                          "type": "string"
                        },
                        "additionalProperties": {}
                      }
                    },
                    "required": ["type", "data", "mimeType"],
                    "additionalProperties": false
                  },
                  {
                    "type": "object",
                    "properties": {
                      "name": {
                        "type": "string"
                      },
                      "title": {
                        "type": "string"
                      },
                      "icons": {
                        "type": "array",
                        "items": {
                          "type": "object",
                          "properties": {
                            "src": {
                              "type": "string"
                            },
                            "mimeType": {
                              "type": "string"
                            },
                            "sizes": {
                              "type": "array",
                              "items": {
                                "type": "string"
                              }
                            }
                          },
                          "required": ["src"],
                          "additionalProperties": false
                        }
                      },
                      "uri": {
                        "type": "string"
                      },
                      "description": {
                        "type": "string"
                      },
                      "mimeType": {
                        "type": "string"
                      },
                      "annotations": {
                        "type": "object",
                        "properties": {
                          "audience": {
                            "type": "array",
                            "items": {
                              "type": "string",
                              "enum": ["user", "assistant"]
                            }
                          },
                          "priority": {
                            "type": "number",
                            "minimum": 0,
                            "maximum": 1
                          },
                          "lastModified": {
                            "type": "string",
                            "format": "date-time",
                            "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d(?::[0-5]\\d(?:\\.\\d+)?)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$"
                          }
                        },
                        "additionalProperties": false
                      },
                      "_meta": {
                        "type": "object",
                        "properties": {},
                        "additionalProperties": {}
                      },
                      "type": {
                        "type": "string",
                        "const": "resource_link"
                      }
                    },
                    "required": ["name", "uri", "type"],
                    "additionalProperties": false
                  },
                  {
                    "type": "object",
                    "properties": {
                      "type": {
                        "type": "string",
                        "const": "resource"
                      },
                      "resource": {
                        "anyOf": [
                          {
                            "type": "object",
                            "properties": {
                              "uri": {
                                "type": "string"
                              },
                              "mimeType": {
                                "type": "string"
                              },
                              "_meta": {
                                "type": "object",
                                "propertyNames": {
                                  "type": "string"
                                },
                                "additionalProperties": {}
                              },
                              "text": {
                                "type": "string"
                              }
                            },
                            "required": ["uri", "text"],
                            "additionalProperties": false
                          },
                          {
                            "type": "object",
                            "properties": {
                              "uri": {
                                "type": "string"
                              },
                              "mimeType": {
                                "type": "string"
                              },
                              "_meta": {
                                "type": "object",
                                "propertyNames": {
                                  "type": "string"
                                },
                                "additionalProperties": {}
                              },
                              "blob": {
                                "type": "string"
                              }
                            },
                            "required": ["uri", "blob"],
                            "additionalProperties": false
                          }
                        ]
                      },
                      "annotations": {
                        "type": "object",
                        "properties": {
                          "audience": {
                            "type": "array",
                            "items": {
                              "type": "string",
                              "enum": ["user", "assistant"]
                            }
                          },
                          "priority": {
                            "type": "number",
                            "minimum": 0,
                            "maximum": 1
                          },
                          "lastModified": {
                            "type": "string",
                            "format": "date-time",
                            "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d(?::[0-5]\\d(?:\\.\\d+)?)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$"
                          }
                        },
                        "additionalProperties": false
                      },
                      "_meta": {
                        "type": "object",
                        "propertyNames": {
                          "type": "string"
                        },
                        "additionalProperties": {}
                      }
                    },
                    "required": ["type", "resource"],
                    "additionalProperties": false
                  }
                ]
              }
            }
          },
          "required": ["role", "content"],
          "additionalProperties": false
        }
      },
      "required": ["method", "params"],
      "additionalProperties": false
    },
    "McpUiMessageResult": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "type": "object",
      "properties": {
        "isError": {
          "description": "True if the host rejected or failed to deliver the message.",
          "type": "boolean"
        }
      },
      "additionalProperties": {}
    },
    "McpUiOpenLinkRequest": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "type": "object",
      "properties": {
        "method": {
          "type": "string",
          "const": "ui/open-link"
        },
        "params": {
          "type": "object",
          "properties": {
            "url": {
              "description": "URL to open in the host's browser",
              "type": "string"
            }
          },
          "required": ["url"],
          "additionalProperties": false
        }
      },
      "required": ["method", "params"],
      "additionalProperties": false
    },
    "McpUiOpenLinkResult": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "type": "object",
      "properties": {
        "isError": {
          "description": "True if the host failed to open the URL (e.g., due to security policy).",
          "type": "boolean"
        }
      },
      "additionalProperties": {}
    },
    "McpUiResourceCsp": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "type": "object",
      "properties": {
        "connectDomains": {
          "description": "Origins for network requests (fetch/XHR/WebSocket).",
          "type": "array",
          "items": {
            "type": "string"
          }
        },
        "resourceDomains": {
          "description": "Origins for static resources (scripts, images, styles, fonts).",
          "type": "array",
          "items": {
            "type": "string"
          }
        }
      },
      "additionalProperties": false
    },
    "McpUiResourceMeta": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "type": "object",
      "properties": {
        "csp": {
          "description": "Content Security Policy configuration.",
          "type": "object",
          "properties": {
            "connectDomains": {
              "description": "Origins for network requests (fetch/XHR/WebSocket).",
              "type": "array",
              "items": {
                "type": "string"
              }
            },
            "resourceDomains": {
              "description": "Origins for static resources (scripts, images, styles, fonts).",
              "type": "array",
              "items": {
                "type": "string"
              }
            }
          },
          "additionalProperties": false
        },
        "domain": {
          "description": "Dedicated origin for widget sandbox.",
          "type": "string"
        },
        "prefersBorder": {
          "description": "Visual boundary preference - true if UI prefers a visible border.",
          "type": "boolean"
        }
      },
      "additionalProperties": false
    },
    "McpUiResourceTeardownRequest": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "type": "object",
      "properties": {
        "method": {
          "type": "string",
          "const": "ui/resource-teardown"
        },
        "params": {
          "type": "object",
          "properties": {},
          "additionalProperties": false
        }
      },
      "required": ["method", "params"],
      "additionalProperties": false
    },
    "McpUiResourceTeardownResult": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "type": "object",
      "propertyNames": {
        "type": "string"
      },
      "additionalProperties": {}
    },
    "McpUiSandboxProxyReadyNotification": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "type": "object",
      "properties": {
        "method": {
          "type": "string",
          "const": "ui/notifications/sandbox-proxy-ready"
        },
        "params": {
          "type": "object",
          "properties": {},
          "additionalProperties": false
        }
      },
      "required": ["method", "params"],
      "additionalProperties": false
    },
    "McpUiSandboxResourceReadyNotification": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "type": "object",
      "properties": {
        "method": {
          "type": "string",
          "const": "ui/notifications/sandbox-resource-ready"
        },
        "params": {
          "type": "object",
          "properties": {
            "html": {
              "description": "HTML content to load into the inner iframe.",
              "type": "string"
            },
            "sandbox": {
              "description": "Optional override for the inner iframe's sandbox attribute.",
              "type": "string"
            },
            "csp": {
              "description": "CSP configuration from resource metadata.",
              "type": "object",
              "properties": {
                "connectDomains": {
                  "description": "Origins for network requests (fetch/XHR/WebSocket).",
                  "type": "array",
                  "items": {
                    "type": "string"
                  }
                },
                "resourceDomains": {
                  "description": "Origins for static resources (scripts, images, styles, fonts).",
                  "type": "array",
                  "items": {
                    "type": "string"
                  }
                }
              },
              "additionalProperties": false
            }
          },
          "required": ["html"],
          "additionalProperties": false
        }
      },
      "required": ["method", "params"],
      "additionalProperties": false
    },
    "McpUiSizeChangedNotification": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "type": "object",
      "properties": {
        "method": {
          "type": "string",
          "const": "ui/notifications/size-changed"
        },
        "params": {
          "type": "object",
          "properties": {
            "width": {
              "description": "New width in pixels.",
              "type": "number"
            },
            "height": {
              "description": "New height in pixels.",
              "type": "number"
            }
          },
          "additionalProperties": false
        }
      },
      "required": ["method", "params"],
      "additionalProperties": false
    },
    "McpUiTheme": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "description": "Color theme preference for the host environment.",
      "anyOf": [
        {
          "type": "string",
          "const": "light"
        },
        {
          "type": "string",
          "const": "dark"
        }
      ]
    },
    "McpUiToolCancelledNotification": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "type": "object",
      "properties": {
        "method": {
          "type": "string",
          "const": "ui/notifications/tool-cancelled"
        },
        "params": {
          "type": "object",
          "properties": {
            "reason": {
              "description": "Optional reason for the cancellation (e.g., \"user action\", \"timeout\").",
              "type": "string"
            }
          },
          "additionalProperties": false
        }
      },
      "required": ["method", "params"],
      "additionalProperties": false
    },
    "McpUiToolInputNotification": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "type": "object",
      "properties": {
        "method": {
          "type": "string",
          "const": "ui/notifications/tool-input"
        },
        "params": {
          "type": "object",
          "properties": {
            "arguments": {
              "description": "Complete tool call arguments as key-value pairs.",
              "type": "object",
              "propertyNames": {
                "type": "string"
              },
              "additionalProperties": {
                "description": "Complete tool call arguments as key-value pairs."
              }
            }
          },
          "additionalProperties": false
        }
      },
      "required": ["method", "params"],
      "additionalProperties": false
    },
    "McpUiToolInputPartialNotification": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "type": "object",
      "properties": {
        "method": {
          "type": "string",
          "const": "ui/notifications/tool-input-partial"
        },
        "params": {
          "type": "object",
          "properties": {
            "arguments": {
              "description": "Partial tool call arguments (incomplete, may change).",
              "type": "object",
              "propertyNames": {
                "type": "string"
              },
              "additionalProperties": {
                "description": "Partial tool call arguments (incomplete, may change)."
              }
            }
          },
          "additionalProperties": false
        }
      },
      "required": ["method", "params"],
      "additionalProperties": false
    },
    "McpUiToolResultNotification": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "type": "object",
      "properties": {
        "method": {
          "type": "string",
          "const": "ui/notifications/tool-result"
        },
        "params": {
          "description": "Standard MCP tool execution result.",
          "type": "object",
          "properties": {
            "_meta": {
              "type": "object",
              "properties": {
                "io.modelcontextprotocol/related-task": {
                  "type": "object",
                  "properties": {
                    "taskId": {
                      "type": "string"
                    }
                  },
                  "required": ["taskId"],
                  "additionalProperties": {}
                }
              },
              "additionalProperties": {}
            },
            "content": {
              "default": [],
              "type": "array",
              "items": {
                "anyOf": [
                  {
                    "type": "object",
                    "properties": {
                      "type": {
                        "type": "string",
                        "const": "text"
                      },
                      "text": {
                        "type": "string"
                      },
                      "annotations": {
                        "type": "object",
                        "properties": {
                          "audience": {
                            "type": "array",
                            "items": {
                              "type": "string",
                              "enum": ["user", "assistant"]
                            }
                          },
                          "priority": {
                            "type": "number",
                            "minimum": 0,
                            "maximum": 1
                          },
                          "lastModified": {
                            "type": "string",
                            "format": "date-time",
                            "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d(?::[0-5]\\d(?:\\.\\d+)?)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$"
                          }
                        },
                        "additionalProperties": false
                      },
                      "_meta": {
                        "type": "object",
                        "propertyNames": {
                          "type": "string"
                        },
                        "additionalProperties": {}
                      }
                    },
                    "required": ["type", "text"],
                    "additionalProperties": false
                  },
                  {
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}