---
title: "List session messages"
method: GET
path: "/session-messages"
tags: ["Session Messages"]
---

# List session messages

`GET /session-messages`

## Request

- Base URL: `https://api.metorial.com`
- URL: `https://api.metorial.com/session-messages`
- Auth: HTTP bearer

Returns a paginated list of messages for a session.

## Query parameters

- `limit` number
- `after` string
- `before` string
- `cursor` string
- `order` 'asc' | 'desc'
- `type` union
  - 'unknown' | 'tool_call' | 'mcp_control' | 'mcp_message'
  - string[]
- `source` union
  - 'provider' | 'client'
  - string[]
- `hierarchy` union
  - 'child' | 'parent'
  - string[]
- `status` union
  - 'waiting_for_response' | 'succeeded' | 'failed'
  - string[]
- `id` union
  - string
  - string[]
- `session_id` union
  - string
  - string[]
- `session_provider_id` union
  - string
  - string[]
- `session_connection_id` union
  - string
  - string[]
- `provider_run_id` union
  - string
  - string[]
- `error_id` union
  - string
  - string[]
- `participant_id` union
  - string
  - string[]
- `parent_message_id` union
  - string
  - string[]
- `created_at` object
  - `gt` string, date-time: Only include records after this timestamp for session message creation time
  - `lt` string, date-time: Only include records before this timestamp for session message creation time
- `updated_at` object
  - `gt` string, date-time: Only include records after this timestamp for session message last update time
  - `lt` string, date-time: Only include records before this timestamp for session message last update time

## Headers

- `Metorial-Version` string

## Response `200`

Successful response

- SubspaceSessionMessageList
  - `items` Item27[], required
    - `object` 'session.message', required: String representing the object's type
    - `id` string, required: Unique session message identifier
    - `type` 'tool_call' | 'mcp_control' | 'mcp_message' | 'unknown', required: Message type
    - `status` 'waiting_for_response' | 'failed' | 'succeeded', required: Message status
    - `source` 'client' | 'provider', required: Message source
    - `session_id` string, required: Parent session ID
    - `session_provider_id` string, nullable, required: Session provider ID
    - `connection_id` string, nullable, required: Connection ID
    - `provider_run_id` string, nullable, required: Provider run ID
    - `hierarchy` Hierarchy, required: Message hierarchy information
      - `object` 'session.message.hierarchy', required
      - `type` string, required: Hierarchy type
      - `parent_message_id` string, nullable, required: Parent message ID
      - `child_message_ids` string[], required: List of child message IDs
    - `transport` Transport, required: Transport information
      - `object` 'session.message.transport', required
      - `type` 'mcp' | 'tool_call' | 'metorial_protocol' | 'system', required: Transport type
      - `mcp` object, nullable, required
        - `object` 'session.message.transport.mcp', required
        - `id` union, required: MCP message ID
          - string
          - number
        - `protocol_version` string, required: MCP protocol version
        - `transport` string, required: MCP transport type
      - `tool_call` object, nullable, required
        - `object` 'session.message.transport.tool_call', required
        - `id` string, required: Tool call ID
    - `input` object, nullable, required: Input message data. Bodies larger than 16 KB in list responses, or larger than 1 MB when retrieving by ID, are replaced with a session.message.omitted_body object.
    - `output` object, nullable, required: Output message data. Bodies larger than 16 KB in list responses, or larger than 1 MB when retrieving by ID, are replaced with a session.message.omitted_body object.
    - `tool_call` object, nullable, required
      - `object` 'session.tool_call', required: String representing the object's type
      - `id` string, required: Unique tool call identifier
      - `tool_key` string, required: The key identifying the tool that was called
      - `type` 'tool_call' | 'mcp_control' | 'mcp_message' | 'unknown', required: The type of the tool call
      - `status` 'waiting_for_response' | 'failed' | 'succeeded', required: Current status of the tool call
      - `source` 'client' | 'provider', required: Source of the tool call
      - `transport` 'tool_call' | 'mcp' | 'metorial_protocol' | 'system', required: Transport protocol used
      - `session_id` string, required: Parent session ID
      - `message_id` string, required: Associated session message ID
      - `session_provider_id` string, nullable, required: Session provider ID
      - `connection_id` string, nullable, required: Session connection ID
      - `provider_run_id` string, nullable, required: Provider run ID
      - `sender_participant` object, nullable, required
        - `object` 'session.participant', required: String representing the object's type
        - `id` string, required: Unique session participant identifier
        - `type` 'unknown' | 'provider' | 'agent' | 'system', required: Participant type
        - `identifier` string, required: Participant identifier
        - `name` string, required: Display name
        - `data` Data, required: Participant payload data
          - `identifier` string, required: Participant-specific identifier within the payload
          - `name` string, required: Participant-specific display name within the payload
        - `provider_id` string, nullable, required: Provider ID if associated
        - `connection_type` 'mcp' | 'metorial_protocol' | 'tool_call', nullable, required
        - `agent_id` string, nullable, required
        - `agent_instance_id` string, nullable, required
        - `identity_actor_id` string, nullable, required
        - `identity_id` string, nullable, required
        - `agent_actor_id` string, nullable, required
        - `agent_client_id` string, nullable, required
        - `consumer_id` string, nullable, required
        - `created_at` string, date-time, required: Timestamp when created
      - `responder_participant` object, nullable, required
        - `object` 'session.participant', required: String representing the object's type
        - `id` string, required: Unique session participant identifier
        - `type` 'unknown' | 'provider' | 'agent' | 'system', required: Participant type
        - `identifier` string, required: Participant identifier
        - `name` string, required: Display name
        - `data` Data, required: Participant payload data
          - `identifier` string, required: Participant-specific identifier within the payload
          - `name` string, required: Participant-specific display name within the payload
        - `provider_id` string, nullable, required: Provider ID if associated
        - `connection_type` 'mcp' | 'metorial_protocol' | 'tool_call', nullable, required
        - `agent_id` string, nullable, required
        - `agent_instance_id` string, nullable, required
        - `identity_actor_id` string, nullable, required
        - `identity_id` string, nullable, required
        - `agent_actor_id` string, nullable, required
        - `agent_client_id` string, nullable, required
        - `consumer_id` string, nullable, required
        - `created_at` string, date-time, required: Timestamp when created
      - `tool` Tool, required
        - `object` 'provider.tool', required: String representing the object's type
        - `id` string, required: Unique tool identifier
        - `key` string, required: Tool key
        - `name` string, required: Display name of the tool
        - `description` string, nullable, required: Tool description
        - `capabilities` object, required: Tool capabilities
        - `constraints` string[], required: Tool constraints
        - `instructions` string[], required: Tool usage instructions
        - `input_schema` object, nullable, required
          - `type` 'json_schema', required
          - `schema` object, required: JSON Schema defining the tool input parameters
        - `output_schema` object, nullable, required
          - `type` 'json_schema', required
          - `schema` object, required: JSON Schema defining the tool output format
        - `tags` object, nullable, required
          - `destructive` boolean, nullable, required: Whether the tool is destructive
          - `read_only` boolean, nullable, required: Whether the tool is read-only
        - `tool_category_keys` string[], required: Keys of the tool categories this tool belongs to
        - `specification_id` string, required: Specification ID
        - `provider_id` string, required: Provider ID
        - `created_at` string, date-time, required: Timestamp when created
        - `updated_at` string, date-time, required: Timestamp when last updated
      - `error` object, nullable, required
        - `object` 'session.error', required: String representing the object's type
        - `id` string, required: Unique session error identifier
        - `code` string, required: Error code
        - `message` string, required: Error message
        - `data` object, required: Error payload data
        - `status` 'processing' | 'processed', required: Indicates whether the error is still being processed or has been fully processed and grouped.
        - `session_id` string, required: Parent session ID
        - `provider_run_id` string, nullable, required: Provider run ID
        - `connection_id` string, nullable, required: Connection ID
        - `group_id` string, nullable, required: Error group ID
        - `similar_error_count` number, required: Count of similar errors in the group
        - `created_at` string, date-time, required: Timestamp when created
      - `input` object, nullable, required: Input data passed to the tool call. Bodies larger than 16 KB in list responses, or larger than 1 MB when retrieving by ID, are replaced with a session.message.omitted_body object.
      - `output` object, nullable, required: Output data returned from the tool call. Bodies larger than 16 KB in list responses, or larger than 1 MB when retrieving by ID, are replaced with a session.message.omitted_body object.
      - `created_at` string, date-time, required: Timestamp when created
    - `sender_participant` SenderParticipant, required
      - `object` 'session.participant', required: String representing the object's type
      - `id` string, required: Unique session participant identifier
      - `type` 'unknown' | 'provider' | 'agent' | 'system', required: Participant type
      - `identifier` string, required: Participant identifier
      - `name` string, required: Display name
      - `data` Data, required: Participant payload data
        - `identifier` string, required: Participant-specific identifier within the payload
        - `name` string, required: Participant-specific display name within the payload
      - `provider_id` string, nullable, required: Provider ID if associated
      - `connection_type` 'mcp' | 'metorial_protocol' | 'tool_call', nullable, required
      - `agent_id` string, nullable, required
      - `agent_instance_id` string, nullable, required
      - `identity_actor_id` string, nullable, required
      - `identity_id` string, nullable, required
      - `agent_actor_id` string, nullable, required
      - `agent_client_id` string, nullable, required
      - `consumer_id` string, nullable, required
      - `created_at` string, date-time, required: Timestamp when created
    - `responder_participant` object, nullable, required
      - `object` 'session.participant', required: String representing the object's type
      - `id` string, required: Unique session participant identifier
      - `type` 'unknown' | 'provider' | 'agent' | 'system', required: Participant type
      - `identifier` string, required: Participant identifier
      - `name` string, required: Display name
      - `data` Data, required: Participant payload data
        - `identifier` string, required: Participant-specific identifier within the payload
        - `name` string, required: Participant-specific display name within the payload
      - `provider_id` string, nullable, required: Provider ID if associated
      - `connection_type` 'mcp' | 'metorial_protocol' | 'tool_call', nullable, required
      - `agent_id` string, nullable, required
      - `agent_instance_id` string, nullable, required
      - `identity_actor_id` string, nullable, required
      - `identity_id` string, nullable, required
      - `agent_actor_id` string, nullable, required
      - `agent_client_id` string, nullable, required
      - `consumer_id` string, nullable, required
      - `created_at` string, date-time, required: Timestamp when created
    - `error` object, nullable, required
      - `object` 'session.error', required: String representing the object's type
      - `id` string, required: Unique session error identifier
      - `code` string, required: Error code
      - `message` string, required: Error message
      - `data` object, required: Error payload data
      - `status` 'processing' | 'processed', required: Indicates whether the error is still being processed or has been fully processed and grouped.
      - `session_id` string, required: Parent session ID
      - `provider_run_id` string, nullable, required: Provider run ID
      - `connection_id` string, nullable, required: Connection ID
      - `group_id` string, nullable, required: Error group ID
      - `similar_error_count` number, required: Count of similar errors in the group
      - `created_at` string, date-time, required: Timestamp when created
    - `created_at` string, date-time, required: Timestamp when created
  - `pagination` object, required
    - `has_more_before` boolean, required
    - `has_more_after` boolean, required

## Other responses

- `400`: Invalid parameters or action
- `401`: Missing or invalid API key
- `403`: The key lacks permission for this resource
- `404`: No such resource
- `422`: Validation failed
- `429`: Rate limit exceeded
- `500`: Unexpected server error

---

[API](https://skmtc.dev/metorial/apis/metorial-api.md) - [All operations](https://skmtc.dev/metorial/apis/metorial-api/llms.txt) - [OpenAPI document](https://skmtc.dev/metorial/apis/metorial-api/revisions/10ccc89f3eac?raw)