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chat.spaces.messages.create

Creates a message in a Google Chat space with text, cards, attachments, or a threaded reply.

Instructions

Creates a message in a Google Chat space. For an example, see Send a message. Supports the following types of authentication: - App authentication with the authorization scope: - https://www.googleapis.com/auth/chat.bot - User authentication with one of the following authorization scopes: - https://w [HTTP POST] — creates or triggers a change; refused under --readonly safety profiles. Returns the API's response resource as JSON — request body is a JSON Message object accepting accessoryWidgets, actionResponse, annotations, argumentText, attachedGifs, attachment, cards, cardsV2 and 20 more fields; pass it via paramsor whole viabody_file` Siblings over the same resource: delete, get, list, patch, replaceCards, search, update.

Input Schema

Name	Required	Description
`query`	No	Extra KEY=VALUE query pairs for endpoints whose parameters Discovery does not describe.
`params`	No	Parameter map merged into the request; typed parameters win.
`parent`	Yes	[URL path segment] Required. The resource name of the space in which to create a message. Format: `spaces/{space}`
`dry_run`	No	Return the request that would be sent, without sending it.
`body_file`	No	Read the request body from this file ('-' for stdin) instead of building one from the parameters. The body is a JSON Message object.
`messageId`	No	[query parameter] Optional. A custom ID for a message. Lets Chat apps get, update, or delete a message without needing to store the system-assigned ID in the message's resource n
`requestId`	No	[query parameter] Optional. A unique ID for this request. A random UUID is recommended. Specifying a request ID makes the request idempotent, which ensures that multiple identica
`threadKey`	No	[query parameter] Optional. Deprecated: Use thread.thread_key instead. ID for the thread. Supports up to 4000 characters. To start or add to a thread, create a message and specif
`request_body`	No	Request body of type Message: pass it via `params` (merged into the built body) or whole via `body_file`.
`messageReplyOption`	No	[query parameter] Optional. Specifies whether a message starts a thread or replies to one. Only supported in named spaces. When [responding to user interactions](https://develope Values: `MESSAGE_REPLY_OPTION_UNSPECIFIED` = Default. Starts a new thread. Using this option ignores any thread ID or `thread_key` that's included.; `REPLY_MESSAGE_FALLBACK_TO_NEW_THREAD` = Creates the message as a reply to the thread specified by thread ID or `thread_key`. If it fails, the message starts a new thread instead.; `REPLY_MESSAGE_OR_FAIL` = Creates the message as a reply to the thread specified by thread ID or `thread_key`. If a new `thread_key` is used, a new thread is created. If the message creation fails, a `NOT_FOUND` error is returned instead..
`createMessageNotificationOptions.notificationType`	No	[query parameter] The notification type for the message. Values: `NOTIFICATION_TYPE_NONE` = Default behavior. Notification behavior is similar to when the human user sends the message using the Chat UI: no notification is sent to the human sender.; `NOTIFICATION_TYPE_FORCE_NOTIFY` = Force notify recipients. This bypasses users' space notification settings and [Chat Do Not Disturb settings](https://support.google.com/chat/answer/9093489). This option does not bypass device-level Do Not Disturb settings. Requires [app authentication] (https://developers.google.com/workspace/chat/authenticate-authorize-chat-app).; `NOTIFICATION_TYPE_SILENT` = Do not notify recipients, and do not mark the message as unread. This behaves similarly to the user muting the conversation or enabling [Chat Do Not Disturb](https://support.google.com/chat/answer/9093489). Requires [app authentication] (https://developers.google.com/workspace/chat/authenticate-authorize-chat-app)..

Output Schema

Name	Required	Description	Default
`name`	No
`text`	No
`cards`	No
`space`	No
`sender`	No
`silent`	No
`thread`	No
`cardsV2`	No
`attachment`	No
`createTime`	No
`deleteTime`	No
`matchedUrl`	No
`annotations`	No
`threadReply`	No
`argumentText`	No
`attachedGifs`	No
`fallbackText`	No
`markupSyntax`	No
`slashCommand`	No
`formattedText`	No
`actionResponse`	No
`lastUpdateTime`	No
`accessoryWidgets`	No
`deletionMetadata`	No
`privateMessageViewer`	No
`quotedMessageMetadata`	No
`emojiReactionSummaries`	No
`clientAssignedMessageId`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed2 schema fields changedOct 26, 2026

changedInput schema / properties / body_file / description

Previous value: -"Read the request body from this file ('-' for stdin) instead of building one from the parameters."New value: +"Read the request body from this file ('-' for stdin) instead of building one from the parameters. The body is a JSON Message object."

addedInput schema / properties / request_body

Added value: +{
+  "description": "Request body of type Message: pass it via `params` (merged into the built body) or whole via `body_file`.",
+  "properties": {
+    "accessoryWidgets": {
+      "items": {
+        "properties": {
+          "buttonList": {
+            "properties": {
+              "buttons": {
+                "items": {
+                  "properties": {
+                    "altText": {
+                      "type": "string"
+                    },
+                    "color": {
+                      "type": "object"
+                    },
+                    "disabled": {
+                      "type": "boolean"
+                    },
+                    "icon": {
+                      "type": "object"
+                    },
+                    "onClick": {
+                      "type": "object"
+                    },
+                    "text": {
+                      "type": "string"
+                    },
+                    "type": {
+                      "enum": [
+                        "TYPE_UNSPECIFIED",
+                        "OUTLINED",
+                        "FILLED",
+                        "FILLED_TONAL",
+                        "BORDERLESS"
+                      ],
+                      "type": "string"
+                    }
+                  },
+                  "type": "object"
+                },
+                "type": "array"
+              }
+            },
+            "type": "object"
+          }
+        },
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "actionResponse": {
+      "properties": {
+        "dialogAction": {
+          "properties": {
+            "actionStatus": {
+              "properties": {
+                "statusCode": {
+                  "enum": [
+                    "OK",
+                    "CANCELLED",
+                    "UNKNOWN",
+                    "INVALID_ARGUMENT",
+                    "DEADLINE_EXCEEDED",
+                    "NOT_FOUND",
+                    "ALREADY_EXISTS",
+                    "PERMISSION_DENIED",
+                    "UNAUTHENTICATED",
+                    "RESOURCE_EXHAUSTED",
+                    "FAILED_PRECONDITION",
+                    "ABORTED",
+                    "OUT_OF_RANGE",
+                    "UNIMPLEMENTED",
+                    "INTERNAL",
+                    "UNAVAILABLE",
+                    "DATA_LOSS"
+                  ],
+                  "type": "string"
+                },
+                "userFacingMessage": {
+                  "type": "string"
+                }
+              },
+              "type": "object"
+            },
+            "dialog": {
+              "properties": {
+                "body": {
+                  "type": "object"
+                }
+              },
+              "type": "object"
+            }
+          },
+          "type": "object"
+        },
+        "type": {
+          "enum": [
+            "TYPE_UNSPECIFIED",
+            "NEW_MESSAGE",
+            "UPDATE_MESSAGE",
+            "UPDATE_USER_MESSAGE_CARDS",
+            "REQUEST_CONFIG",
+            "DIALOG",
+            "UPDATE_WIDGET"
+          ],
+          "type": "string"
+        },
+        "updatedWidget": {
+          "properties": {
+            "suggestions": {
+              "properties": {
+                "items": {
+                  "items": {
+                    "type": "object"
+                  },
+                  "type": "array"
+                }
+              },
+              "type": "object"
+            },
+            "widget": {
+              "type": "string"
+            }
+          },
+          "type": "object"
+        },
+        "url": {
+          "type": "string"
+        }
+      },
+      "type": "object"
+    },
+    "annotations": {
+      "items": {
+        "properties": {
+          "customEmojiMetadata": {
+            "properties": {
+              "customEmoji": {
+                "properties": {
+                  "emojiName": {
+                    "type": "string"
+                  },
+                  "name": {
+                    "type": "string"
+                  },
+                  "payload": {
+                    "type": "object"
+                  },
+                  "temporaryImageUri": {
+                    "type": "string"
+                  },
+                  "uid": {
+                    "type": "string"
+                  }
+                },
+                "type": "object"
+              }
+            },
+            "type": "object"
+          },
+          "length": {
+            "type": "integer"
+          },
+          "richLinkMetadata": {
+            "properties": {
+              "calendarEventLinkData": {
+                "properties": {
+                  "calendarId": {
+                    "type": "string"
+                  },
+                  "eventId": {
+                    "type": "string"
+                  }
+                },
+                "type": "object"
+              },
+              "chatSpaceLinkData": {
+                "properties": {
+                  "message": {
+                    "type": "string"
+                  },
+                  "space": {
+                    "type": "string"
+                  },
+                  "thread": {
+                    "type": "string"
+                  }
+                },
+                "type": "object"
+              },
+              "driveLinkData": {
+                "properties": {
+                  "driveDataRef": {
+                    "type": "object"
+                  },
+                  "mimeType": {
+                    "type": "string"
+                  }
+                },
+                "type": "object"
+              },
+              "meetSpaceLinkData": {
+                "properties": {
+                  "huddleStatus": {
+                    "enum": [
+                      "HUDDLE_STATUS_UNSPECIFIED",
+                      "STARTED",
+                      "ENDED",
+                      "MISSED"
+                    ],
+                    "type": "string"
+                  },
+                  "meetingCode": {
+                    "type": "string"
+                  },
+                  "type": {
+                    "enum": [
+                      "TYPE_UNSPECIFIED",
+                      "MEETING",
+                      "HUDDLE"
+                    ],
+                    "type": "string"
+                  }
+                },
+                "type": "object"
+              },
+              "richLinkType": {
+                "enum": [
+                  "RICH_LINK_TYPE_UNSPECIFIED",
+                  "DRIVE_FILE",
+                  "CHAT_SPACE",
+                  "GMAIL_MESSAGE",
+                  "MEET_SPACE",
+                  "CALENDAR_EVENT"
+                ],
+                "type": "string"
+              },
+              "uri": {
+                "type": "string"
+              }
+            },
+            "type": "object"
+          },
+          "slashCommand": {
+            "properties": {
+              "bot": {
+                "properties": {
+                  "avatarUrl": {
+                    "type": "string"
+                  },
+                  "displayName": {
+                    "type": "string"
+                  },
+                  "domainId": {
+                    "type": "string"
+                  },
+                  "email": {
+                    "type": "string"
+                  },
+                  "isAnonymous": {
+                    "type": "boolean"
+                  },
+                  "name": {
+                    "type": "string"
+                  },
+                  "type": {
+                    "enum": [
+                      "TYPE_UNSPECIFIED",
+                      "HUMAN",
+                      "BOT"
+                    ],
+                    "type": "string"
+                  }
+                },
+                "type": "object"
+              },
+              "commandId": {
+                "type": "string"
+              },
+              "commandName": {
+                "type": "string"
+              },
+              "triggersDialog": {
+                "type": "boolean"
+              },
+              "type": {
+                "enum": [
+                  "TYPE_UNSPECIFIED",
+                  "ADD",
+                  "INVOKE"
+                ],
+                "type": "string"
+              }
+            },
+            "type": "object"
+          },
+          "startIndex": {
+            "type": "integer"
+          },
+          "type": {
+            "enum": [
+              "ANNOTATION_TYPE_UNSPECIFIED",
+              "USER_MENTION",
+              "SLASH_COMMAND",
+              "RICH_LINK",
+              "CUSTOM_EMOJI"
+            ],
+            "type": "string"
+          },
+          "userMention": {
+            "properties": {
+              "type": {
+                "enum": [
+                  "TYPE_UNSPECIFIED",
+                  "ADD",
+                  "MENTION"
+                ],
+                "type": "string"
+              },
+              "user": {
+                "properties": {
+                  "avatarUrl": {
+                    "type": "string"
+                  },
+                  "displayName": {
+                    "type": "string"
+                  },
+                  "domainId": {
+                    "type": "string"
+                  },
+                  "email": {
+                    "type": "string"
+                  },
+                  "isAnonymous": {
+                    "type": "boolean"
+                  },
+                  "name": {
+                    "type": "string"
+                  },
+                  "type": {
+                    "enum": [
+                      "TYPE_UNSPECIFIED",
+                      "HUMAN",
+                      "BOT"
+                    ],
+                    "type": "string"
+                  }
+                },
+                "type": "object"
+              }
+            },
+            "type": "object"
+          }
+        },
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "argumentText": {
+      "type": "string"
+    },
+    "attachedGifs": {
+      "items": {
+        "properties": {
+          "uri": {
+            "type": "string"
+          }
+        },
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "attachment": {
+      "items": {
+        "properties": {
+          "attachmentDataRef": {
+            "properties": {
+              "attachmentUploadToken": {
+                "type": "string"
+              },
+              "resourceName": {
+                "type": "string"
+              }
+            },
+            "type": "object"
+          },
+          "contentName": {
+            "type": "string"
+          },
+          "contentType": {
+            "type": "string"
+          },
+          "downloadUri": {
+            "type": "string"
+          },
+          "driveDataRef": {
+            "properties": {
+              "driveFileId": {
+                "type": "string"
+              }
+            },
+            "type": "object"
+          },
+          "name": {
+            "type": "string"
+          },
+          "source": {
+            "enum": [
+              "SOURCE_UNSPECIFIED",
+              "DRIVE_FILE",
+              "UPLOADED_CONTENT"
+            ],
+            "type": "string"
+          },
+          "thumbnailUri": {
+            "type": "string"
+          }
+        },
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "cards": {
+      "items": {
+        "properties": {
+          "cardActions": {
+            "items": {
+              "properties": {
+                "actionLabel": {
+                  "type": "string"
+                },
+                "onClick": {
+                  "properties": {
+                    "action": {
+                      "type": "object"
+                    },
+                    "openLink": {
+                      "type": "object"
+                    }
+                  },
+                  "type": "object"
+                }
+              },
+              "type": "object"
+            },
+            "type": "array"
+          },
+          "header": {
+            "properties": {
+              "imageStyle": {
+                "enum": [
+                  "IMAGE_STYLE_UNSPECIFIED",
+                  "IMAGE",
+                  "AVATAR"
+                ],
+                "type": "string"
+              },
+              "imageUrl": {
+                "type": "string"
+              },
+              "subtitle": {
+                "type": "string"
+              },
+              "title": {
+                "type": "string"
+              }
+            },
+            "type": "object"
+          },
+          "name": {
+            "type": "string"
+          },
+          "sections": {
+            "items": {
+              "properties": {
+                "header": {
+                  "type": "string"
+                },
+                "widgets": {
+                  "items": {
+                    "properties": {
+                      "buttons": {
+                        "items": {
+                          "type": "object"
+                        },
+                        "type": "array"
+                      },
+                      "image": {
+                        "type": "object"
+                      },
+                      "keyValue": {
+                        "type": "object"
+                      },
+                      "textParagraph": {
+                        "type": "object"
+                      }
+                    },
+                    "type": "object"
+                  },
+                  "type": "array"
+                }
+              },
+              "type": "object"
+            },
+            "type": "array"
+          }
+        },
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "cardsV2": {
+      "items": {
+        "properties": {
+          "card": {
+            "properties": {
+              "cardActions": {
+                "items": {
+                  "properties": {
+                    "actionLabel": {
+                      "type": "string"
+                    },
+                    "onClick": {
+                      "type": "object"
+                    }
+                  },
+                  "type": "object"
+                },
+                "type": "array"
+              },
+              "displayStyle": {
+                "enum": [
+                  "DISPLAY_STYLE_UNSPECIFIED",
+                  "PEEK",
+                  "REPLACE"
+                ],
+                "type": "string"
+              },
+              "expressionData": {
+                "items": {
+                  "properties": {
+                    "conditions": {
+                      "items": {
+                        "type": "object"
+                      },
+                      "type": "array"
+                    },
+                    "eventActions": {
+                      "items": {
+                        "type": "object"
+                      },
+                      "type": "array"
+                    },
+                    "expression": {
+                      "type": "string"
+                    },
+                    "id": {
+                      "type": "string"
+                    }
+                  },
+                  "type": "object"
+                },
+                "type": "array"
+              },
+              "fixedFooter": {
+                "properties": {
+                  "primaryButton": {
+                    "type": "object"
+                  },
+                  "secondaryButton": {
+                    "type": "object"
+                  }
+                },
+                "type": "object"
+              },
+              "header": {
+                "properties": {
+                  "imageAltText": {
+                    "type": "string"
+                  },
+                  "imageType": {
+                    "enum": [
+                      "SQUARE",
+                      "CIRCLE"
+                    ],
+                    "type": "string"
+                  },
+                  "imageUrl": {
+                    "type": "string"
+                  },
+                  "subtitle": {
+                    "type": "string"
+                  },
+                  "title": {
+                    "type": "string"
+                  }
+                },
+                "type": "object"
+              },
+              "name": {
+                "type": "string"
+              },
+              "peekCardHeader": {
+                "properties": {
+                  "imageAltText": {
+                    "type": "string"
+                  },
+                  "imageType": {
+                    "enum": [
+                      "SQUARE",
+                      "CIRCLE"
+                    ],
+                    "type": "string"
+                  },
+                  "imageUrl": {
+                    "type": "string"
+                  },
+                  "subtitle": {
+                    "type": "string"
+                  },
+                  "title": {
+                    "type": "string"
+                  }
+                },
+                "type": "object"
+              },
+              "sectionDividerStyle": {
+                "enum": [
+                  "DIVIDER_STYLE_UNSPECIFIED",
+                  "SOLID_DIVIDER",
+                  "NO_DIVIDER"
+                ],
+                "type": "string"
+              },
+              "sections": {
+                "items": {
+                  "properties": {
+                    "collapseControl": {
+                      "type": "object"
+                    },
+                    "collapsible": {
+                      "type": "boolean"
+                    },
+                    "header": {
+                      "type": "string"
+                    },
+                    "id": {
+                      "type": "string"
+                    },
+                    "uncollapsibleWidgetsCount": {
+                      "type": "integer"
+                    },
+                    "widgets": {
+                      "items": {
+                        "type": "object"
+                      },
+                      "type": "array"
+                    }
+                  },
+                  "type": "object"
+                },
+                "type": "array"
+              }
+            },
+            "type": "object"
+          },
+          "cardId": {
+            "type": "string"
+          },
+          "ownerUser": {
+            "properties": {
+              "avatarUrl": {
+                "type": "string"
+              },
+              "displayName": {
+                "type": "string"
+              },
+              "domainId": {
+                "type": "string"
+              },
+              "email": {
+                "type": "string"
+              },
+              "isAnonymous": {
+                "type": "boolean"
+              },
+              "name": {
+                "type": "string"
+              },
+              "type": {
+                "enum": [
+                  "TYPE_UNSPECIFIED",
+                  "HUMAN",
+                  "BOT"
+                ],
+                "type": "string"
+              }
+            },
+            "type": "object"
+          }
+        },
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "clientAssignedMessageId": {
+      "type": "string"
+    },
+    "createTime": {
+      "type": "string"
+    },
+    "deleteTime": {
+      "type": "string"
+    },
+    "deletionMetadata": {
+      "properties": {
+        "deletionType": {
+          "enum": [
+            "DELETION_TYPE_UNSPECIFIED",
+            "CREATOR",
+            "SPACE_OWNER",
+            "ADMIN",
+            "APP_MESSAGE_EXPIRY",
+            "CREATOR_VIA_APP",
+            "SPACE_OWNER_VIA_APP",
+            "SPACE_MEMBER"
+          ],
+          "type": "string"
+        }
+      },
+      "type": "object"
+    },
+    "emojiReactionSummaries": {
+      "items": {
+        "properties": {
+          "emoji": {
+            "properties": {
+              "customEmoji": {
+                "properties": {
+                  "emojiName": {
+                    "type": "string"
+                  },
+                  "name": {
+                    "type": "string"
+                  },
+                  "payload": {
+                    "type": "object"
+                  },
+                  "temporaryImageUri": {
+                    "type": "string"
+                  },
+                  "uid": {
+                    "type": "string"
+                  }
+                },
+                "type": "object"
+              },
+              "unicode": {
+                "type": "string"
+              }
+            },
+            "type": "object"
+          },
+          "reactionCount": {
+            "type": "integer"
+          }
+        },
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "fallbackText": {
+      "type": "string"
+    },
+    "formattedText": {
+      "type": "string"
+    },
+    "lastUpdateTime": {
+      "type": "string"
+    },
+    "markupSyntax": {
+      "enum": [
+        "MARKUP_SYNTAX_UNSPECIFIED",
+        "MARKUP_SYNTAX_CHAT",
+        "MARKUP_SYNTAX_MARKDOWN"
+      ],
+      "type": "string"
+    },
+    "matchedUrl": {
+      "properties": {
+        "url": {
+          "type": "string"
+        }
+      },
+      "type": "object"
+    },
+    "name": {
+      "type": "string"
+    },
+    "privateMessageViewer": {
+      "properties": {
+        "avatarUrl": {
+          "type": "string"
+        },
+        "displayName": {
+          "type": "string"
+        },
+        "domainId": {
+          "type": "string"
+        },
+        "email": {
+          "type": "string"
+        },
+        "isAnonymous": {
+          "type": "boolean"
+        },
+        "name": {
+          "type": "string"
+        },
+        "type": {
+          "enum": [
+            "TYPE_UNSPECIFIED",
+            "HUMAN",
+            "BOT"
+          ],
+          "type": "string"
+        }
+      },
+      "type": "object"
+    },
+    "quotedMessageMetadata": {
+      "properties": {
+        "forwardedMetadata": {
+          "properties": {
+            "space": {
+              "type": "string"
+            },
+            "spaceDisplayName": {
+              "type": "string"
+            }
+          },
+          "type": "object"
+        },
+        "lastUpdateTime": {
+          "type": "string"
+        },
+        "name": {
+          "type": "string"
+        },
+        "quoteType": {
+          "enum": [
+            "QUOTE_TYPE_UNSPECIFIED",
+            "REPLY",
+            "FORWARD"
+          ],
+          "type": "string"
+        },
+        "quotedMessageSnapshot": {
+          "properties": {
+            "annotations": {
+              "items": {
+                "properties": {
+                  "customEmojiMetadata": {
+                    "type": "object"
+                  },
+                  "length": {
+                    "type": "integer"
+                  },
+                  "richLinkMetadata": {
+                    "type": "object"
+                  },
+                  "slashCommand": {
+                    "type": "object"
+                  },
+                  "startIndex": {
+                    "type": "integer"
+                  },
+                  "type": {
+                    "enum": [
+                      "ANNOTATION_TYPE_UNSPECIFIED",
+                      "USER_MENTION",
+                      "SLASH_COMMAND",
+                      "RICH_LINK",
+                      "CUSTOM_EMOJI"
+                    ],
+                    "type": "string"
+                  },
+                  "userMention": {
+                    "type": "object"
+                  }
+                },
+                "type": "object"
+              },
+              "type": "array"
+            },
+            "attachments": {
+              "items": {
+                "properties": {
+                  "attachmentDataRef": {
+                    "type": "object"
+                  },
+                  "contentName": {
+                    "type": "string"
+                  },
+                  "contentType": {
+                    "type": "string"
+                  },
+                  "downloadUri": {
+                    "type": "string"
+                  },
+                  "driveDataRef": {
+                    "type": "object"
+                  },
+                  "name": {
+                    "type": "string"
+                  },
+                  "source": {
+                    "enum": [
+                      "SOURCE_UNSPECIFIED",
+                      "DRIVE_FILE",
+                      "UPLOADED_CONTENT"
+                    ],
+                    "type": "string"
+                  },
+                  "thumbnailUri": {
+                    "type": "string"
+                  }
+                },
+                "type": "object"
+              },
+              "type": "array"
+            },
+            "formattedText": {
+              "type": "string"
+            },
+            "sender": {
+              "type": "string"
+            },
+            "text": {
+              "type": "string"
+            }
+          },
+          "type": "object"
+        }
+      },
+      "type": "object"
+    },
+    "sender": {
+      "properties": {
+        "avatarUrl": {
+          "type": "string"
+        },
+        "displayName": {
+          "type": "string"
+        },
+        "domainId": {
+          "type": "string"
+        },
+        "email": {
+          "type": "string"
+        },
+        "isAnonymous": {
+          "type": "boolean"
+        },
+        "name": {
+          "type": "string"
+        },
+        "type": {
+          "enum": [
+            "TYPE_UNSPECIFIED",
+            "HUMAN",
+            "BOT"
+          ],
+          "type": "string"
+        }
+      },
+      "type": "object"
+    },
+    "silent": {
+      "type": "boolean"
+    },
+    "slashCommand": {
+      "properties": {
+        "commandId": {
+          "type": "string"
+        }
+      },
+      "type": "object"
+    },
+    "space": {
+      "properties": {
+        "accessSettings": {
+          "properties": {
+            "accessPermissionSettings": {
+              "properties": {
+                "discoverSpaceSetting": {
+                  "type": "object"
+                },
+                "joinSpaceSetting": {
+                  "type": "object"
+                },
+                "viewSpaceMembershipSetting": {
+                  "type": "object"
+                }
+              },
+              "type": "object"
+            },
+            "accessState": {
+              "enum": [
+                "ACCESS_STATE_UNSPECIFIED",
+                "PRIVATE",
+                "DISCOVERABLE"
+              ],
+              "type": "string"
+            },
+            "audience": {
+              "type": "string"
+            }
+          },
+          "type": "object"
+        },
+        "adminInstalled": {
+          "type": "boolean"
+        },
+        "createTime": {
+          "type": "string"
+        },
+        "customer": {
+          "type": "string"
+        },
+        "displayName": {
+          "type": "string"
+        },
+        "externalUserAllowed": {
+          "type": "boolean"
+        },
+        "importMode": {
+          "type": "boolean"
+        },
+        "importModeExpireTime": {
+          "type": "string"
+        },
+        "lastActiveTime": {
+          "type": "string"
+        },
+        "membershipCount": {
+          "properties": {
+            "joinedDirectHumanUserCount": {
+              "type": "integer"
+            },
+            "joinedGroupCount": {
+              "type": "integer"
+            }
+          },
+          "type": "object"
+        },
+        "name": {
+          "type": "string"
+        },
+        "permissionSettings": {
+          "properties": {
+            "manageApps": {
+              "properties": {
+                "assistantManagersAllowed": {
+                  "type": "boolean"
+                },
+                "managersAllowed": {
+                  "type": "boolean"
+                },
+                "membersAllowed": {
+                  "type": "boolean"
+                }
+              },
+              "type": "object"
+            },
+            "manageMembersAndGroups": {
+              "properties": {
+                "assistantManagersAllowed": {
+                  "type": "boolean"
+                },
+                "managersAllowed": {
+                  "type": "boolean"
+                },
+                "membersAllowed": {
+                  "type": "boolean"
+                }
+              },
+              "type": "object"
+            },
+            "manageWebhooks": {
+              "properties": {
+                "assistantManagersAllowed": {
+                  "type": "boolean"
+                },
+                "managersAllowed": {
+                  "type": "boolean"
+                },
+                "membersAllowed": {
+                  "type": "boolean"
+                }
+              },
+              "type": "object"
+            },
+            "modifySpaceDetails": {
+              "properties": {
+                "assistantManagersAllowed": {
+                  "type": "boolean"
+                },
+                "managersAllowed": {
+                  "type": "boolean"
+                },
+                "membersAllowed": {
+                  "type": "boolean"
+                }
+              },
+              "type": "object"
+            },
+            "postMessages": {
+              "properties": {
+                "assistantManagersAllowed": {
+                  "type": "boolean"
+                },
+                "managersAllowed": {
+                  "type": "boolean"
+                },
+                "membersAllowed": {
+                  "type": "boolean"
+                }
+              },
+              "type": "object"
+            },
+            "replyMessages": {
+              "properties": {
+                "assistantManagersAllowed": {
+                  "type": "boolean"
+                },
+                "managersAllowed": {
+                  "type": "boolean"
+                },
+                "membersAllowed": {
+                  "type": "boolean"
+                }
+              },
+              "type": "object"
+            },
+            "toggleHistory": {
+              "properties": {
+                "assistantManagersAllowed": {
+                  "type": "boolean"
+                },
+                "managersAllowed": {
+                  "type": "boolean"
+                },
+                "membersAllowed": {
+                  "type": "boolean"
+                }
+              },
+              "type": "object"
+            },
+            "useAtMentionAll": {
+              "properties": {
+                "assistantManagersAllowed": {
+                  "type": "boolean"
+                },
+                "managersAllowed": {
+                  "type": "boolean"
+                },
+                "membersAllowed": {
+                  "type": "boolean"
+                }
+              },
+              "type": "object"
+            },
+            "viewSpaceMembership": {
+              "properties": {
+                "assistantManagersAllowed": {
+                  "type": "boolean"
+                },
+                "managersAllowed": {
+                  "type": "boolean"
+                },
+                "membersAllowed": {
+                  "type": "boolean"
+                }
+              },
+              "type": "object"
+            }
+          },
+          "type": "object"
+        },
+        "predefinedPermissionSettings": {
+          "enum": [
+            "PREDEFINED_PERMISSION_SETTINGS_UNSPECIFIED",
+            "COLLABORATION_SPACE",
+            "ANNOUNCEMENT_SPACE"
+          ],
+          "type": "string"
+        },
+        "singleUserBotDm": {
+          "type": "boolean"
+        },
+        "spaceDetails": {
+          "properties": {
+            "description": {
+              "type": "string"
+            },
+            "guidelines": {
+              "type": "string"
+            }
+          },
+          "type": "object"
+        },
+        "spaceHistoryState": {
+          "enum": [
+            "HISTORY_STATE_UNSPECIFIED",
+            "HISTORY_OFF",
+            "HISTORY_ON"
+          ],
+          "type": "string"
+        },
+        "spaceThreadingState": {
+          "enum": [
+            "SPACE_THREADING_STATE_UNSPECIFIED",
+            "THREADED_MESSAGES",
+            "GROUPED_MESSAGES",
+            "UNTHREADED_MESSAGES"
+          ],
+          "type": "string"
+        },
+        "spaceType": {
+          "enum": [
+            "SPACE_TYPE_UNSPECIFIED",
+            "SPACE",
+            "GROUP_CHAT",
+            "DIRECT_MESSAGE"
+          ],
+          "type": "string"
+        },
+        "spaceUri": {
+          "type": "string"
+        },
+        "threaded": {
+          "type": "boolean"
+        },
+        "type": {
+          "enum": [
+            "TYPE_UNSPECIFIED",
+            "ROOM",
+            "DM"
+          ],
+          "type": "string"
+        }
+      },
+      "type": "object"
+    },
+    "text": {
+      "type": "string"
+    },
+    "thread": {
+      "properties": {
+        "name": {
+          "type": "string"
+        },
+        "threadKey": {
+          "type": "string"
+        }
+      },
+      "type": "object"
+    },
+    "threadReply": {
+      "type": "boolean"
+    }
+  },
+  "type": "object"
+}

Changed8 schema fields changedOct 26, 2026

changedInput schema / properties / createMessageNotificationOptions.notificationType / description

Previous value: -"The notification type for the message."New value: +"[query parameter] The notification type for the message. Values: `NOTIFICATION_TYPE_NONE` = Default behavior. Notification behavior is similar to when the human user sends the message using the Chat UI: no notification is sent to the human sender.; `NOTIFICATION_TYPE_FORCE_NOTIFY` = Force notify recipients. This bypasses users' space notification settings and [Chat Do Not Disturb settings](https://support.google.com/chat/answer/9093489). This option does not bypass device-level Do Not Disturb settings. Requires [app authentication] (https://developers.google.com/workspace/chat/authenticate-authorize-chat-app).; `NOTIFICATION_TYPE_SILENT` = Do not notify recipients, and do not mark the message as unread. This behaves similarly to the user muting the conversation or enabling [Chat Do Not Disturb](https://support.google.com/chat/answer/9093489). Requires [app authentication] (https://developers.google.com/workspace/chat/authenticate-authorize-chat-app).."

changedInput schema / properties / messageId / description

Previous value: -"Optional. A custom ID for a message. Lets Chat apps get, update, or delete a message without needing to store the system-assigned ID in the message's resource n"New value: +"[query parameter] Optional. A custom ID for a message. Lets Chat apps get, update, or delete a message without needing to store the system-assigned ID in the message's resource n"

changedInput schema / properties / messageReplyOption / description

Previous value: -"Optional. Specifies whether a message starts a thread or replies to one. Only supported in named spaces. When [responding to user interactions](https://develope"New value: +"[query parameter] Optional. Specifies whether a message starts a thread or replies to one. Only supported in named spaces. When [responding to user interactions](https://develope Values: `MESSAGE_REPLY_OPTION_UNSPECIFIED` = Default. Starts a new thread. Using this option ignores any thread ID or `thread_key` that's included.; `REPLY_MESSAGE_FALLBACK_TO_NEW_THREAD` = Creates the message as a reply to the thread specified by thread ID or `thread_key`. If it fails, the message starts a new thread instead.; `REPLY_MESSAGE_OR_FAIL` = Creates the message as a reply to the thread specified by thread ID or `thread_key`. If a new `thread_key` is used, a new thread is created. If the message creation fails, a `NOT_FOUND` error is returned instead.."

changedInput schema / properties / parent / description

Previous value: -"Required. The resource name of the space in which to create a message. Format: `spaces/{space}`"New value: +"[URL path segment] Required. The resource name of the space in which to create a message. Format: `spaces/{space}`"

addedInput schema / properties / parent / pattern
```
Added value: +"^spaces/[^/]+$"
```

changedInput schema / properties / requestId / description

Previous value: -"Optional. A unique ID for this request. A random UUID is recommended. Specifying a request ID makes the request idempotent, which ensures that multiple identica"New value: +"[query parameter] Optional. A unique ID for this request. A random UUID is recommended. Specifying a request ID makes the request idempotent, which ensures that multiple identica"

changedInput schema / properties / threadKey / description

Previous value: -"Optional. Deprecated: Use thread.thread_key instead. ID for the thread. Supports up to 4000 characters. To start or add to a thread, create a message and specif"New value: +"[query parameter] Optional. Deprecated: Use thread.thread_key instead. ID for the thread. Supports up to 4000 characters. To start or add to a thread, create a message and specif"

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "properties": {
+    "accessoryWidgets": {
+      "items": {
+        "properties": {
+          "buttonList": {
+            "properties": {
+              "buttons": {
+                "items": {
+                  "properties": {
+                    "altText": {
+                      "type": "string"
+                    },
+                    "color": {
+                      "type": "object"
+                    },
+                    "disabled": {
+                      "type": "boolean"
+                    },
+                    "icon": {
+                      "type": "object"
+                    },
+                    "onClick": {
+                      "type": "object"
+                    },
+                    "text": {
+                      "type": "string"
+                    },
+                    "type": {
+                      "enum": [
+                        "TYPE_UNSPECIFIED",
+                        "OUTLINED",
+                        "FILLED",
+                        "FILLED_TONAL",
+                        "BORDERLESS"
+                      ],
+                      "type": "string"
+                    }
+                  },
+                  "type": "object"
+                },
+                "type": "array"
+              }
+            },
+            "type": "object"
+          }
+        },
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "actionResponse": {
+      "properties": {
+        "dialogAction": {
+          "properties": {
+            "actionStatus": {
+              "properties": {
+                "statusCode": {
+                  "enum": [
+                    "OK",
+                    "CANCELLED",
+                    "UNKNOWN",
+                    "INVALID_ARGUMENT",
+                    "DEADLINE_EXCEEDED",
+                    "NOT_FOUND",
+                    "ALREADY_EXISTS",
+                    "PERMISSION_DENIED",
+                    "UNAUTHENTICATED",
+                    "RESOURCE_EXHAUSTED",
+                    "FAILED_PRECONDITION",
+                    "ABORTED",
+                    "OUT_OF_RANGE",
+                    "UNIMPLEMENTED",
+                    "INTERNAL",
+                    "UNAVAILABLE",
+                    "DATA_LOSS"
+                  ],
+                  "type": "string"
+                },
+                "userFacingMessage": {
+                  "type": "string"
+                }
+              },
+              "type": "object"
+            },
+            "dialog": {
+              "properties": {
+                "body": {
+                  "type": "object"
+                }
+              },
+              "type": "object"
+            }
+          },
+          "type": "object"
+        },
+        "type": {
+          "enum": [
+            "TYPE_UNSPECIFIED",
+            "NEW_MESSAGE",
+            "UPDATE_MESSAGE",
+            "UPDATE_USER_MESSAGE_CARDS",
+            "REQUEST_CONFIG",
+            "DIALOG",
+            "UPDATE_WIDGET"
+          ],
+          "type": "string"
+        },
+        "updatedWidget": {
+          "properties": {
+            "suggestions": {
+              "properties": {
+                "items": {
+                  "items": {
+                    "type": "object"
+                  },
+                  "type": "array"
+                }
+              },
+              "type": "object"
+            },
+            "widget": {
+              "type": "string"
+            }
+          },
+          "type": "object"
+        },
+        "url": {
+          "type": "string"
+        }
+      },
+      "type": "object"
+    },
+    "annotations": {
+      "items": {
+        "properties": {
+          "customEmojiMetadata": {
+            "properties": {
+              "customEmoji": {
+                "properties": {
+                  "emojiName": {
+                    "type": "string"
+                  },
+                  "name": {
+                    "type": "string"
+                  },
+                  "payload": {
+                    "type": "object"
+                  },
+                  "temporaryImageUri": {
+                    "type": "string"
+                  },
+                  "uid": {
+                    "type": "string"
+                  }
+                },
+                "type": "object"
+              }
+            },
+            "type": "object"
+          },
+          "length": {
+            "type": "integer"
+          },
+          "richLinkMetadata": {
+            "properties": {
+              "calendarEventLinkData": {
+                "properties": {
+                  "calendarId": {
+                    "type": "string"
+                  },
+                  "eventId": {
+                    "type": "string"
+                  }
+                },
+                "type": "object"
+              },
+              "chatSpaceLinkData": {
+                "properties": {
+                  "message": {
+                    "type": "string"
+                  },
+                  "space": {
+                    "type": "string"
+                  },
+                  "thread": {
+                    "type": "string"
+                  }
+                },
+                "type": "object"
+              },
+              "driveLinkData": {
+                "properties": {
+                  "driveDataRef": {
+                    "type": "object"
+                  },
+                  "mimeType": {
+                    "type": "string"
+                  }
+                },
+                "type": "object"
+              },
+              "meetSpaceLinkData": {
+                "properties": {
+                  "huddleStatus": {
+                    "enum": [
+                      "HUDDLE_STATUS_UNSPECIFIED",
+                      "STARTED",
+                      "ENDED",
+                      "MISSED"
+                    ],
+                    "type": "string"
+                  },
+                  "meetingCode": {
+                    "type": "string"
+                  },
+                  "type": {
+                    "enum": [
+                      "TYPE_UNSPECIFIED",
+                      "MEETING",
+                      "HUDDLE"
+                    ],
+                    "type": "string"
+                  }
+                },
+                "type": "object"
+              },
+              "richLinkType": {
+                "enum": [
+                  "RICH_LINK_TYPE_UNSPECIFIED",
+                  "DRIVE_FILE",
+                  "CHAT_SPACE",
+                  "GMAIL_MESSAGE",
+                  "MEET_SPACE",
+                  "CALENDAR_EVENT"
+                ],
+                "type": "string"
+              },
+              "uri": {
+                "type": "string"
+              }
+            },
+            "type": "object"
+          },
+          "slashCommand": {
+            "properties": {
+              "bot": {
+                "properties": {
+                  "avatarUrl": {
+                    "type": "string"
+                  },
+                  "displayName": {
+                    "type": "string"
+                  },
+                  "domainId": {
+                    "type": "string"
+                  },
+                  "email": {
+                    "type": "string"
+                  },
+                  "isAnonymous": {
+                    "type": "boolean"
+                  },
+                  "name": {
+                    "type": "string"
+                  },
+                  "type": {
+                    "enum": [
+                      "TYPE_UNSPECIFIED",
+                      "HUMAN",
+                      "BOT"
+                    ],
+                    "type": "string"
+                  }
+                },
+                "type": "object"
+              },
+              "commandId": {
+                "type": "string"
+              },
+              "commandName": {
+                "type": "string"
+              },
+              "triggersDialog": {
+                "type": "boolean"
+              },
+              "type": {
+                "enum": [
+                  "TYPE_UNSPECIFIED",
+                  "ADD",
+                  "INVOKE"
+                ],
+                "type": "string"
+              }
+            },
+            "type": "object"
+          },
+          "startIndex": {
+            "type": "integer"
+          },
+          "type": {
+            "enum": [
+              "ANNOTATION_TYPE_UNSPECIFIED",
+              "USER_MENTION",
+              "SLASH_COMMAND",
+              "RICH_LINK",
+              "CUSTOM_EMOJI"
+            ],
+            "type": "string"
+          },
+          "userMention": {
+            "properties": {
+              "type": {
+                "enum": [
+                  "TYPE_UNSPECIFIED",
+                  "ADD",
+                  "MENTION"
+                ],
+                "type": "string"
+              },
+              "user": {
+                "properties": {
+                  "avatarUrl": {
+                    "type": "string"
+                  },
+                  "displayName": {
+                    "type": "string"
+                  },
+                  "domainId": {
+                    "type": "string"
+                  },
+                  "email": {
+                    "type": "string"
+                  },
+                  "isAnonymous": {
+                    "type": "boolean"
+                  },
+                  "name": {
+                    "type": "string"
+                  },
+                  "type": {
+                    "enum": [
+                      "TYPE_UNSPECIFIED",
+                      "HUMAN",
+                      "BOT"
+                    ],
+                    "type": "string"
+                  }
+                },
+                "type": "object"
+              }
+            },
+            "type": "object"
+          }
+        },
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "argumentText": {
+      "type": "string"
+    },
+    "attachedGifs": {
+      "items": {
+        "properties": {
+          "uri": {
+            "type": "string"
+          }
+        },
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "attachment": {
+      "items": {
+        "properties": {
+          "attachmentDataRef": {
+            "properties": {
+              "attachmentUploadToken": {
+                "type": "string"
+              },
+              "resourceName": {
+                "type": "string"
+              }
+            },
+            "type": "object"
+          },
+          "contentName": {
+            "type": "string"
+          },
+          "contentType": {
+            "type": "string"
+          },
+          "downloadUri": {
+            "type": "string"
+          },
+          "driveDataRef": {
+            "properties": {
+              "driveFileId": {
+                "type": "string"
+              }
+            },
+            "type": "object"
+          },
+          "name": {
+            "type": "string"
+          },
+          "source": {
+            "enum": [
+              "SOURCE_UNSPECIFIED",
+              "DRIVE_FILE",
+              "UPLOADED_CONTENT"
+            ],
+            "type": "string"
+          },
+          "thumbnailUri": {
+            "type": "string"
+          }
+        },
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "cards": {
+      "items": {
+        "properties": {
+          "cardActions": {
+            "items": {
+              "properties": {
+                "actionLabel": {
+                  "type": "string"
+                },
+                "onClick": {
+                  "properties": {
+                    "action": {
+                      "type": "object"
+                    },
+                    "openLink": {
+                      "type": "object"
+                    }
+                  },
+                  "type": "object"
+                }
+              },
+              "type": "object"
+            },
+            "type": "array"
+          },
+          "header": {
+            "properties": {
+              "imageStyle": {
+                "enum": [
+                  "IMAGE_STYLE_UNSPECIFIED",
+                  "IMAGE",
+                  "AVATAR"
+                ],
+                "type": "string"
+              },
+              "imageUrl": {
+                "type": "string"
+              },
+              "subtitle": {
+                "type": "string"
+              },
+              "title": {
+                "type": "string"
+              }
+            },
+            "type": "object"
+          },
+          "name": {
+            "type": "string"
+          },
+          "sections": {
+            "items": {
+              "properties": {
+                "header": {
+                  "type": "string"
+                },
+                "widgets": {
+                  "items": {
+                    "properties": {
+                      "buttons": {
+                        "items": {
+                          "type": "object"
+                        },
+                        "type": "array"
+                      },
+                      "image": {
+                        "type": "object"
+                      },
+                      "keyValue": {
+                        "type": "object"
+                      },
+                      "textParagraph": {
+                        "type": "object"
+                      }
+                    },
+                    "type": "object"
+                  },
+                  "type": "array"
+                }
+              },
+              "type": "object"
+            },
+            "type": "array"
+          }
+        },
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "cardsV2": {
+      "items": {
+        "properties": {
+          "card": {
+            "properties": {
+              "cardActions": {
+                "items": {
+                  "properties": {
+                    "actionLabel": {
+                      "type": "string"
+                    },
+                    "onClick": {
+                      "type": "object"
+                    }
+                  },
+                  "type": "object"
+                },
+                "type": "array"
+              },
+              "displayStyle": {
+                "enum": [
+                  "DISPLAY_STYLE_UNSPECIFIED",
+                  "PEEK",
+                  "REPLACE"
+                ],
+                "type": "string"
+              },
+              "expressionData": {
+                "items": {
+                  "properties": {
+                    "conditions": {
+                      "items": {
+                        "type": "object"
+                      },
+                      "type": "array"
+                    },
+                    "eventActions": {
+                      "items": {
+                        "type": "object"
+                      },
+                      "type": "array"
+                    },
+                    "expression": {
+                      "type": "string"
+                    },
+                    "id": {
+                      "type": "string"
+                    }
+                  },
+                  "type": "object"
+                },
+                "type": "array"
+              },
+              "fixedFooter": {
+                "properties": {
+                  "primaryButton": {
+                    "type": "object"
+                  },
+                  "secondaryButton": {
+                    "type": "object"
+                  }
+                },
+                "type": "object"
+              },
+              "header": {
+                "properties": {
+                  "imageAltText": {
+                    "type": "string"
+                  },
+                  "imageType": {
+                    "enum": [
+                      "SQUARE",
+                      "CIRCLE"
+                    ],
+                    "type": "string"
+                  },
+                  "imageUrl": {
+                    "type": "string"
+                  },
+                  "subtitle": {
+                    "type": "string"
+                  },
+                  "title": {
+                    "type": "string"
+                  }
+                },
+                "type": "object"
+              },
+              "name": {
+                "type": "string"
+              },
+              "peekCardHeader": {
+                "properties": {
+                  "imageAltText": {
+                    "type": "string"
+                  },
+                  "imageType": {
+                    "enum": [
+                      "SQUARE",
+                      "CIRCLE"
+                    ],
+                    "type": "string"
+                  },
+                  "imageUrl": {
+                    "type": "string"
+                  },
+                  "subtitle": {
+                    "type": "string"
+                  },
+                  "title": {
+                    "type": "string"
+                  }
+                },
+                "type": "object"
+              },
+              "sectionDividerStyle": {
+                "enum": [
+                  "DIVIDER_STYLE_UNSPECIFIED",
+                  "SOLID_DIVIDER",
+                  "NO_DIVIDER"
+                ],
+                "type": "string"
+              },
+              "sections": {
+                "items": {
+                  "properties": {
+                    "collapseControl": {
+                      "type": "object"
+                    },
+                    "collapsible": {
+                      "type": "boolean"
+                    },
+                    "header": {
+                      "type": "string"
+                    },
+                    "id": {
+                      "type": "string"
+                    },
+                    "uncollapsibleWidgetsCount": {
+                      "type": "integer"
+                    },
+                    "widgets": {
+                      "items": {
+                        "type": "object"
+                      },
+                      "type": "array"
+                    }
+                  },
+                  "type": "object"
+                },
+                "type": "array"
+              }
+            },
+            "type": "object"
+          },
+          "cardId": {
+            "type": "string"
+          },
+          "ownerUser": {
+            "properties": {
+              "avatarUrl": {
+                "type": "string"
+              },
+              "displayName": {
+                "type": "string"
+              },
+              "domainId": {
+                "type": "string"
+              },
+              "email": {
+                "type": "string"
+              },
+              "isAnonymous": {
+                "type": "boolean"
+              },
+              "name": {
+                "type": "string"
+              },
+              "type": {
+                "enum": [
+                  "TYPE_UNSPECIFIED",
+                  "HUMAN",
+                  "BOT"
+                ],
+                "type": "string"
+              }
+            },
+            "type": "object"
+          }
+        },
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "clientAssignedMessageId": {
+      "type": "string"
+    },
+    "createTime": {
+      "type": "string"
+    },
+    "deleteTime": {
+      "type": "string"
+    },
+    "deletionMetadata": {
+      "properties": {
+        "deletionType": {
+          "enum": [
+            "DELETION_TYPE_UNSPECIFIED",
+            "CREATOR",
+            "SPACE_OWNER",
+            "ADMIN",
+            "APP_MESSAGE_EXPIRY",
+            "CREATOR_VIA_APP",
+            "SPACE_OWNER_VIA_APP",
+            "SPACE_MEMBER"
+          ],
+          "type": "string"
+        }
+      },
+      "type": "object"
+    },
+    "emojiReactionSummaries": {
+      "items": {
+        "properties": {
+          "emoji": {
+            "properties": {
+              "customEmoji": {
+                "properties": {
+                  "emojiName": {
+                    "type": "string"
+                  },
+                  "name": {
+                    "type": "string"
+                  },
+                  "payload": {
+                    "type": "object"
+                  },
+                  "temporaryImageUri": {
+                    "type": "string"
+                  },
+                  "uid": {
+                    "type": "string"
+                  }
+                },
+                "type": "object"
+              },
+              "unicode": {
+                "type": "string"
+              }
+            },
+            "type": "object"
+          },
+          "reactionCount": {
+            "type": "integer"
+          }
+        },
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "fallbackText": {
+      "type": "string"
+    },
+    "formattedText": {
+      "type": "string"
+    },
+    "lastUpdateTime": {
+      "type": "string"
+    },
+    "markupSyntax": {
+      "enum": [
+        "MARKUP_SYNTAX_UNSPECIFIED",
+        "MARKUP_SYNTAX_CHAT",
+        "MARKUP_SYNTAX_MARKDOWN"
+      ],
+      "type": "string"
+    },
+    "matchedUrl": {
+      "properties": {
+        "url": {
+          "type": "string"
+        }
+      },
+      "type": "object"
+    },
+    "name": {
+      "type": "string"
+    },
+    "privateMessageViewer": {
+      "properties": {
+        "avatarUrl": {
+          "type": "string"
+        },
+        "displayName": {
+          "type": "string"
+        },
+        "domainId": {
+          "type": "string"
+        },
+        "email": {
+          "type": "string"
+        },
+        "isAnonymous": {
+          "type": "boolean"
+        },
+        "name": {
+          "type": "string"
+        },
+        "type": {
+          "enum": [
+            "TYPE_UNSPECIFIED",
+            "HUMAN",
+            "BOT"
+          ],
+          "type": "string"
+        }
+      },
+      "type": "object"
+    },
+    "quotedMessageMetadata": {
+      "properties": {
+        "forwardedMetadata": {
+          "properties": {
+            "space": {
+              "type": "string"
+            },
+            "spaceDisplayName": {
+              "type": "string"
+            }
+          },
+          "type": "object"
+        },
+        "lastUpdateTime": {
+          "type": "string"
+        },
+        "name": {
+          "type": "string"
+        },
+        "quoteType": {
+          "enum": [
+            "QUOTE_TYPE_UNSPECIFIED",
+            "REPLY",
+            "FORWARD"
+          ],
+          "type": "string"
+        },
+        "quotedMessageSnapshot": {
+          "properties": {
+            "annotations": {
+              "items": {
+                "properties": {
+                  "customEmojiMetadata": {
+                    "type": "object"
+                  },
+                  "length": {
+                    "type": "integer"
+                  },
+                  "richLinkMetadata": {
+                    "type": "object"
+                  },
+                  "slashCommand": {
+                    "type": "object"
+                  },
+                  "startIndex": {
+                    "type": "integer"
+                  },
+                  "type": {
+                    "enum": [
+                      "ANNOTATION_TYPE_UNSPECIFIED",
+                      "USER_MENTION",
+                      "SLASH_COMMAND",
+                      "RICH_LINK",
+                      "CUSTOM_EMOJI"
+                    ],
+                    "type": "string"
+                  },
+                  "userMention": {
+                    "type": "object"
+                  }
+                },
+                "type": "object"
+              },
+              "type": "array"
+            },
+            "attachments": {
+              "items": {
+                "properties": {
+                  "attachmentDataRef": {
+                    "type": "object"
+                  },
+                  "contentName": {
+                    "type": "string"
+                  },
+                  "contentType": {
+                    "type": "string"
+                  },
+                  "downloadUri": {
+                    "type": "string"
+                  },
+                  "driveDataRef": {
+                    "type": "object"
+                  },
+                  "name": {
+                    "type": "string"
+                  },
+                  "source": {
+                    "enum": [
+                      "SOURCE_UNSPECIFIED",
+                      "DRIVE_FILE",
+                      "UPLOADED_CONTENT"
+                    ],
+                    "type": "string"
+                  },
+                  "thumbnailUri": {
+                    "type": "string"
+                  }
+                },
+                "type": "object"
+              },
+              "type": "array"
+            },
+            "formattedText": {
+              "type": "string"
+            },
+            "sender": {
+              "type": "string"
+            },
+            "text": {
+              "type": "string"
+            }
+          },
+          "type": "object"
+        }
+      },
+      "type": "object"
+    },
+    "sender": {
+      "properties": {
+        "avatarUrl": {
+          "type": "string"
+        },
+        "displayName": {
+          "type": "string"
+        },
+        "domainId": {
+          "type": "string"
+        },
+        "email": {
+          "type": "string"
+        },
+        "isAnonymous": {
+          "type": "boolean"
+        },
+        "name": {
+          "type": "string"
+        },
+        "type": {
+          "enum": [
+            "TYPE_UNSPECIFIED",
+            "HUMAN",
+            "BOT"
+          ],
+          "type": "string"
+        }
+      },
+      "type": "object"
+    },
+    "silent": {
+      "type": "boolean"
+    },
+    "slashCommand": {
+      "properties": {
+        "commandId": {
+          "type": "string"
+        }
+      },
+      "type": "object"
+    },
+    "space": {
+      "properties": {
+        "accessSettings": {
+          "properties": {
+            "accessPermissionSettings": {
+              "properties": {
+                "discoverSpaceSetting": {
+                  "type": "object"
+                },
+                "joinSpaceSetting": {
+                  "type": "object"
+                },
+                "viewSpaceMembershipSetting": {
+                  "type": "object"
+                }
+              },
+              "type": "object"
+            },
+            "accessState": {
+              "enum": [
+                "ACCESS_STATE_UNSPECIFIED",
+                "PRIVATE",
+                "DISCOVERABLE"
+              ],
+              "type": "string"
+            },
+            "audience": {
+              "type": "string"
+            }
+          },
+          "type": "object"
+        },
+        "adminInstalled": {
+          "type": "boolean"
+        },
+        "createTime": {
+          "type": "string"
+        },
+        "customer": {
+          "type": "string"
+        },
+        "displayName": {
+          "type": "string"
+        },
+        "externalUserAllowed": {
+          "type": "boolean"
+        },
+        "importMode": {
+          "type": "boolean"
+        },
+        "importModeExpireTime": {
+          "type": "string"
+        },
+        "lastActiveTime": {
+          "type": "string"
+        },
+        "membershipCount": {
+          "properties": {
+            "joinedDirectHumanUserCount": {
+              "type": "integer"
+            },
+            "joinedGroupCount": {
+              "type": "integer"
+            }
+          },
+          "type": "object"
+        },
+        "name": {
+          "type": "string"
+        },
+        "permissionSettings": {
+          "properties": {
+            "manageApps": {
+              "properties": {
+                "assistantManagersAllowed": {
+                  "type": "boolean"
+                },
+                "managersAllowed": {
+                  "type": "boolean"
+                },
+                "membersAllowed": {
+                  "type": "boolean"
+                }
+              },
+              "type": "object"
+            },
+            "manageMembersAndGroups": {
+              "properties": {
+                "assistantManagersAllowed": {
+                  "type": "boolean"
+                },
+                "managersAllowed": {
+                  "type": "boolean"
+                },
+                "membersAllowed": {
+                  "type": "boolean"
+                }
+              },
+              "type": "object"
+            },
+            "manageWebhooks": {
+              "properties": {
+                "assistantManagersAllowed": {
+                  "type": "boolean"
+                },
+                "managersAllowed": {
+                  "type": "boolean"
+                },
+                "membersAllowed": {
+                  "type": "boolean"
+                }
+              },
+              "type": "object"
+            },
+            "modifySpaceDetails": {
+              "properties": {
+                "assistantManagersAllowed": {
+                  "type": "boolean"
+                },
+                "managersAllowed": {
+                  "type": "boolean"
+                },
+                "membersAllowed": {
+                  "type": "boolean"
+                }
+              },
+              "type": "object"
+            },
+            "postMessages": {
+              "properties": {
+                "assistantManagersAllowed": {
+                  "type": "boolean"
+                },
+                "managersAllowed": {
+                  "type": "boolean"
+                },
+                "membersAllowed": {
+                  "type": "boolean"
+                }
+              },
+              "type": "object"
+            },
+            "replyMessages": {
+              "properties": {
+                "assistantManagersAllowed": {
+                  "type": "boolean"
+                },
+                "managersAllowed": {
+                  "type": "boolean"
+                },
+                "membersAllowed": {
+                  "type": "boolean"
+                }
+              },
+              "type": "object"
+            },
+            "toggleHistory": {
+              "properties": {
+                "assistantManagersAllowed": {
+                  "type": "boolean"
+                },
+                "managersAllowed": {
+                  "type": "boolean"
+                },
+                "membersAllowed": {
+                  "type": "boolean"
+                }
+              },
+              "type": "object"
+            },
+            "useAtMentionAll": {
+              "properties": {
+                "assistantManagersAllowed": {
+                  "type": "boolean"
+                },
+                "managersAllowed": {
+                  "type": "boolean"
+                },
+                "membersAllowed": {
+                  "type": "boolean"
+                }
+              },
+              "type": "object"
+            },
+            "viewSpaceMembership": {
+              "properties": {
+                "assistantManagersAllowed": {
+                  "type": "boolean"
+                },
+                "managersAllowed": {
+                  "type": "boolean"
+                },
+                "membersAllowed": {
+                  "type": "boolean"
+                }
+              },
+              "type": "object"
+            }
+          },
+          "type": "object"
+        },
+        "predefinedPermissionSettings": {
+          "enum": [
+            "PREDEFINED_PERMISSION_SETTINGS_UNSPECIFIED",
+            "COLLABORATION_SPACE",
+            "ANNOUNCEMENT_SPACE"
+          ],
+          "type": "string"
+        },
+        "singleUserBotDm": {
+          "type": "boolean"
+        },
+        "spaceDetails": {
+          "properties": {
+            "description": {
+              "type": "string"
+            },
+            "guidelines": {
+              "type": "string"
+            }
+          },
+          "type": "object"
+        },
+        "spaceHistoryState": {
+          "enum": [
+            "HISTORY_STATE_UNSPECIFIED",
+            "HISTORY_OFF",
+            "HISTORY_ON"
+          ],
+          "type": "string"
+        },
+        "spaceThreadingState": {
+          "enum": [
+            "SPACE_THREADING_STATE_UNSPECIFIED",
+            "THREADED_MESSAGES",
+            "GROUPED_MESSAGES",
+            "UNTHREADED_MESSAGES"
+          ],
+          "type": "string"
+        },
+        "spaceType": {
+          "enum": [
+            "SPACE_TYPE_UNSPECIFIED",
+            "SPACE",
+            "GROUP_CHAT",
+            "DIRECT_MESSAGE"
+          ],
+          "type": "string"
+        },
+        "spaceUri": {
+          "type": "string"
+        },
+        "threaded": {
+          "type": "boolean"
+        },
+        "type": {
+          "enum": [
+            "TYPE_UNSPECIFIED",
+            "ROOM",
+            "DM"
+          ],
+          "type": "string"
+        }
+      },
+      "type": "object"
+    },
+    "text": {
+      "type": "string"
+    },
+    "thread": {
+      "properties": {
+        "name": {
+          "type": "string"
+        },
+        "threadKey": {
+          "type": "string"
+        }
+      },
+      "type": "object"
+    },
+    "threadReply": {
+      "type": "boolean"
+    }
+  },
+  "type": "object"
+}

First observedOct 26, 2026

TDQS

A4/5.0

Behavior4/5

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

With no annotations supplied, the description carries the behavioral burden and does well: it identifies the call as HTTP POST, says it creates or triggers a change, notes that it is refused under --readonly safety profiles, lists authentication modes and scopes, and states that the API response resource is returned as JSON. It stops short of covering rate limits, detailed permission failures, or side effects beyond creation.

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 front-loaded with the core purpose and then presents auth, behavioral, return, and sibling context in a reasonably structured way. It includes some noise, such as truncated auth-scope URLs and the vague '20 more fields' phrase, but overall it remains usable and not bloated.

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

Completeness5/5

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

Given the rich input schema, output schema, and high schema coverage, the description supplies the missing context an agent needs: authentication requirements, mutation/readonly safety behavior, request-body passing mechanics, and sibling tool awareness. Nothing essential for correct invocation appears to be missing.

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

Parameters3/5

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

Schema description coverage is 100%, so the schema already documents all 11 parameters in detail. The description adds a useful note that the JSON Message body can be passed via `params` or `body_file` and summarizes the body fields, but it does not add substantial semantic meaning beyond the structured schema.

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 states a specific verb and resource: 'Creates a message in a Google Chat space.' It also names the siblings over the same resource (delete, get, list, patch, replaceCards, search, update), making the action distinguishable without inspecting other schemas.

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

Usage Guidelines3/5

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

The description makes the basic usage clear by saying it creates a message and by listing sibling operations, but it does not explain when to choose create versus update, patch, or reply behavior. The auth and readonly notes provide context, but there is no explicit when-to-use/when-not-to-use guidance against alternatives.

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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