MCP Tools Reference: chatmcp.googleapis.com

Tool: search_conversations

Searches for Google Chat conversations (named spaces, direct messages (DMs), or group chats) (named spaces, direct messages (DMs), or group chats) by display name or participants to find conversation IDs.

This tool searches conversation metadata, NOT message contents. To search within message history or find messages by keyword/sender/timestamp, use search_messages or participants to find conversation IDs.

This tool searches conversation metadata, NOT message contents. To search within message history or find messages by keyword/sender/timestamp, use search_messages.

If only participants are provided, this tool finds 1:1 direct messages (if one participant is provided) or group chats (if multiple participants are provided) that include the specified participants and the calling user.

If only a query is provided, this tool searches for conversations where the query is a case-insensitive substring of the conversation's display name.

If both participants and query are provided, this tool finds conversations by participants and then filters them by display name.

If neither participants nor query are provided, this tool lists all conversations the calling user is a member of.

This tool only lists conversations the calling user is a member of.

Returns a list of conversation objects containing conversation IDs (format: spaces/{space}), display names, and conversation types.

Returns a list of conversation objects containing conversation IDs (format: spaces/{space}), display names, and conversation types.

IMPORTANT: An empty conversations list does not mean there are no more results overall. If next_page_token is present, more pages can be fetched. If you get an empty list but a next_page_token, ask the user if you should continue the searching.

The following code sample shows how to use curl to call the search_conversations MCP tool.

Curl Request 
curl --location 'https://chatmcp.googleapis.com/mcp/v1' \
--header 'Authorization: Bearer YOUR_ACCESS_TOKEN' \
--header 'content-type: application/json' \
--header 'accept: application/json, text/event-stream' \
--data '{
  "method": "tools/call",
  "params": {
    "name": "search_conversations",
    "arguments": {
      // provide these details according to the tool MCP specification
    }
  },
  "jsonrpc": "2.0",
  "id": 1
}'

Input Schema

SearchConversationsRequest

JSON representation 
{
  "spaceNameQuery": string,
  "pageSize": integer,
  "pageToken": string,
  "participants": [
    string
  ]
}
Fields
spaceNameQuery

string

Optional. The text to search for within the space display names (case-insensitive substring match).
pageSize

integer

Optional. The maximum number of spaces to return. The service may return fewer than this value. If unspecified, at most 20 spaces will be returned. The maximum value is 1000; values above 1000 will be coerced to 1000.
pageToken

string

Optional. A page token, received from a previous search_conversations call. Provide this to retrieve the subsequent page.
participants[]

string

Optional. List of email addresses of the participants to filter the conversations, excluding the caller.

Output Schema

Response containing the list of matching conversations.

SearchConversationsResponse

JSON representation 
{
  "conversations": [
    {
      object (Conversation)
    }
  ],
  "nextPageToken": string
}
Fields
conversations[]

object (Conversation)

List of conversation objects that match the search criteria. Each conversation includes the conversation_id (format: spaces/{space}), display_name, conversation_type, and last_active_timestamp.
nextPageToken

string

A token that can be sent as page_token to retrieve the next page. If this field is omitted, there are no subsequent pages.

Only populated if the request is filtered by participants.

Conversation

JSON representation 
{
  "conversationId": string,
  "displayName": string,
  "conversationType": enum (ConversationType),
  "lastActiveTimestamp": string
}
Fields
conversationId

string

The ID of the conversation (e.g., "spaces/AAAAAAAAA").
displayName

string

The display name of the conversation.
conversationType

enum (ConversationType)

The type of conversation (DIRECT_MESSAGE, GROUP_CHAT, or NAMED_SPACE).
lastActiveTimestamp

string (Timestamp format)

The last active time of the conversation in ISO 8601 format.

Uses RFC 3339, where generated output will always be Z-normalized and use 0, 3, 6 or 9 fractional digits. Offsets other than "Z" are also accepted. Examples: "2014-10-02T15:01:23Z", "2014-10-02T15:01:23.045123456Z" or "2014-10-02T15:01:23+05:30".

Timestamp

JSON representation 
{
  "seconds": string,
  "nanos": integer
}
Fields
seconds

string (int64 format)

Represents seconds of UTC time since Unix epoch 1970-01-01T00:00:00Z. Must be between -62135596800 and 253402300799 inclusive (which corresponds to 0001-01-01T00:00:00Z to 9999-12-31T23:59:59Z).
nanos

integer

Non-negative fractions of a second at nanosecond resolution. This field is the nanosecond portion of the duration, not an alternative to seconds. Negative second values with fractions must still have non-negative nanos values that count forward in time. Must be between 0 and 999,999,999 inclusive.

ConversationType

Defines the type of conversation.

Enums
CONVERSATION_TYPE_UNSPECIFIED Unspecified.
NAMED_SPACE A named space.
GROUP_CHAT A group chat between 3 or more people.
DIRECT_MESSAGE A direct message between two humans, or a human and a Chat app.

Tool Annotations

Tool annotations are sent to MCP clients to describe the basic risk of a given tool. Most clients treat these hints as untrusted, but they can be used to decide when a confirmation prompt might be sent to a user.

Along with the title string, the following boolean hints are defined as follows:

  • readOnlyHint: If true, the tool doesn't modify its environment. Default: false.
  • destructiveHint: If true, then the tool can perform destructive actions. If false, then the tool can only perform additive actions. Default: true.
  • idempotentHint: If true, then calling the tool repeatedly with the same arguments will have no additional effect on its environment. Default: false.
  • openWorldHint: If true, then the tool can interact with an 'open world' of external entities. If false, then the tool can only interact with internal entities. For example, a web search tool would be open world, while a memory tool would not be open world.

Destructive Hint: ❌ | Idempotent Hint: ✅ | Read Only Hint: ✅ | Open World Hint: ❌

Authorization Scopes

Requires one of the following OAuth scopes:

  • https://www.googleapis.com/auth/chat.memberships.readonly
  • https://www.googleapis.com/auth/chat.spaces
  • https://www.googleapis.com/auth/chat.spaces.readonly