Letta · Capability

Letta API — Scheduled Messages

Scheduled messages — one-time or cron-recurring messages that drive agents over time. 4 operations. Lead operation: Schedule Agent Message. Self-contained Naftiko capability covering one Letta business surface.

Letta API — Scheduled Messages is a Naftiko capability published by Letta, one of 36 capabilities the APIs.io network indexes for this provider. It bundles 4 operations across the GET, POST, and DELETE methods rooted at /v1/agents/{…}/schedule.

The capability includes 2 read-only operations and 2 state-changing operations. Lead operation: Schedule Agent Message. Can be deployed as a REST endpoint, MCP tool, or Agent Skill via Naftiko.

Tagged areas include Letta, Stateful Agents, and Scheduled Messages.

Run with Naftiko LettaStateful AgentsScheduled Messages

What You Can Do

POST

Scheduledmessages_scheduleagentmessage — Schedule Agent Message

/v1/agents/{agent-id}/schedule

GET

Scheduledmessages_listscheduledmessages — List Scheduled Agent Messages

/v1/agents/{agent-id}/schedule

DELETE

Scheduledmessages_deletescheduledmessage — Delete Scheduled Agent Message

/v1/agents/{agent-id}/schedule/{scheduled-message-id}

GET

Scheduledmessages_retrievescheduledmessage — Retrieve Scheduled Agent Message

/v1/agents/{agent-id}/schedule/{scheduled-message-id}

MCP Tools

schedule-agent-message

Schedule Agent Message

list-scheduled-agent-messages

List Scheduled Agent Messages

read-only idempotent

delete-scheduled-agent-message

Delete Scheduled Agent Message

idempotent

retrieve-scheduled-agent-message

Retrieve Scheduled Agent Message

read-only idempotent

Capability Spec

naftiko: "1.0.0-alpha2"

info:
  label: "Letta API — Scheduled Messages"
  description: >-
    Scheduled messages — one-time or cron-recurring messages that drive agents over time. 4 operations. Lead operation: Schedule Agent Message. Self-contained Naftiko capability covering one Letta business surface.
  tags:
    - Letta
    - Stateful Agents
    - Scheduled Messages
  created: "2026-05-08"
  modified: "2026-05-22"

binds:
  - namespace: env
    keys:
      LETTA_API_KEY: LETTA_API_KEY

capability:

  consumes:
    - type: http
      namespace: "letta-scheduled-messages"
      baseUri: "https://api.letta.com"
      description: "Letta API — Scheduled Messages business capability. Self-contained, no shared references."
      authentication:
        type: bearer
        token: "{{env.LETTA_API_KEY}}"
      resources:
        - name: "agents-by-id-schedule"
          path: "/v1/agents/{agent_id}/schedule"
          operations:
            - name: "scheduledmessages_scheduleagentmessage"
              method: POST
              description: "Schedule Agent Message"
              inputParameters:
                - name: "agent_id"
                  in: path
                  type: string
                  required: true
                  description: "agent_id parameter"
                - name: "body"
                  in: body
                  type: object
                  required: true
                  description: "Body"
              outputRawFormat: json
              outputParameters:
                - name: result
                  type: object
                  value: "$."
            - name: "scheduledmessages_listscheduledmessages"
              method: GET
              description: "List Scheduled Agent Messages"
              inputParameters:
                - name: "agent_id"
                  in: path
                  type: string
                  required: true
                  description: "agent_id parameter"
                - name: "limit"
                  in: query
                  type: string
                  required: false
                  description: "limit parameter"
                - name: "after"
                  in: query
                  type: string
                  required: false
                  description: "after parameter"
              outputRawFormat: json
              outputParameters:
                - name: result
                  type: object
                  value: "$."
        - name: "agents-by-id-schedule-by-id"
          path: "/v1/agents/{agent_id}/schedule/{scheduled_message_id}"
          operations:
            - name: "scheduledmessages_deletescheduledmessage"
              method: DELETE
              description: "Delete Scheduled Agent Message"
              inputParameters:
                - name: "agent_id"
                  in: path
                  type: string
                  required: true
                  description: "agent_id parameter"
                - name: "scheduled_message_id"
                  in: path
                  type: string
                  required: true
                  description: "scheduled_message_id parameter"
                - name: "body"
                  in: body
                  type: object
                  required: true
                  description: "Body"
              outputRawFormat: json
              outputParameters:
                - name: result
                  type: object
                  value: "$."
            - name: "scheduledmessages_retrievescheduledmessage"
              method: GET
              description: "Retrieve Scheduled Agent Message"
              inputParameters:
                - name: "agent_id"
                  in: path
                  type: string
                  required: true
                  description: "agent_id parameter"
                - name: "scheduled_message_id"
                  in: path
                  type: string
                  required: true
                  description: "scheduled_message_id parameter"
              outputRawFormat: json
              outputParameters:
                - name: result
                  type: object
                  value: "$."

  exposes:
    - type: rest
      namespace: "letta-scheduled-messages-rest"
      port: 8080
      description: "REST adapter for Letta API — Scheduled Messages. One Spectral-compliant resource per consumed operation."
      resources:
        - path: "/v1/agents/{agent-id}/schedule"
          name: "agents-by-id-schedule"
          description: "REST surface for agents-by-id-schedule."
          operations:
            - method: POST
              name: "scheduledmessages_scheduleagentmessage"
              description: "Schedule Agent Message"
              call: "letta-scheduled-messages.scheduledmessages_scheduleagentmessage"
              with:
                "agent_id": "rest.agent_id"
                "body": "rest.body"
              outputParameters:
                - type: object
                  mapping: "$."
            - method: GET
              name: "scheduledmessages_listscheduledmessages"
              description: "List Scheduled Agent Messages"
              call: "letta-scheduled-messages.scheduledmessages_listscheduledmessages"
              with:
                "agent_id": "rest.agent_id"
                "limit": "rest.limit"
                "after": "rest.after"
              outputParameters:
                - type: object
                  mapping: "$."
        - path: "/v1/agents/{agent-id}/schedule/{scheduled-message-id}"
          name: "agents-by-id-schedule-by-id"
          description: "REST surface for agents-by-id-schedule-by-id."
          operations:
            - method: DELETE
              name: "scheduledmessages_deletescheduledmessage"
              description: "Delete Scheduled Agent Message"
              call: "letta-scheduled-messages.scheduledmessages_deletescheduledmessage"
              with:
                "agent_id": "rest.agent_id"
                "scheduled_message_id": "rest.scheduled_message_id"
                "body": "rest.body"
              outputParameters:
                - type: object
                  mapping: "$."
            - method: GET
              name: "scheduledmessages_retrievescheduledmessage"
              description: "Retrieve Scheduled Agent Message"
              call: "letta-scheduled-messages.scheduledmessages_retrievescheduledmessage"
              with:
                "agent_id": "rest.agent_id"
                "scheduled_message_id": "rest.scheduled_message_id"
              outputParameters:
                - type: object
                  mapping: "$."
    - type: mcp
      namespace: "letta-scheduled-messages-mcp"
      port: 9090
      transport: http
      description: "MCP adapter for Letta API — Scheduled Messages. One verb-noun tool per consumed operation."
      tools:
        - name: "schedule-agent-message"
          description: "Schedule Agent Message"
          hints:
            readOnly: false
            destructive: false
            idempotent: false
          call: "letta-scheduled-messages.scheduledmessages_scheduleagentmessage"
          with:
            "agent_id": "tools.agent_id"
            "body": "tools.body"
          outputParameters:
            - type: object
              mapping: "$."
        - name: "list-scheduled-agent-messages"
          description: "List Scheduled Agent Messages"
          hints:
            readOnly: true
            destructive: false
            idempotent: true
          call: "letta-scheduled-messages.scheduledmessages_listscheduledmessages"
          with:
            "agent_id": "tools.agent_id"
            "limit": "tools.limit"
            "after": "tools.after"
          outputParameters:
            - type: object
              mapping: "$."
        - name: "delete-scheduled-agent-message"
          description: "Delete Scheduled Agent Message"
          hints:
            readOnly: false
            destructive: true
            idempotent: true
          call: "letta-scheduled-messages.scheduledmessages_deletescheduledmessage"
          with:
            "agent_id": "tools.agent_id"
            "scheduled_message_id": "tools.scheduled_message_id"
            "body": "tools.body"
          outputParameters:
            - type: object
              mapping: "$."
        - name: "retrieve-scheduled-agent-message"
          description: "Retrieve Scheduled Agent Message"
          hints:
            readOnly: true
            destructive: false
            idempotent: true
          call: "letta-scheduled-messages.scheduledmessages_retrievescheduledmessage"
          with:
            "agent_id": "tools.agent_id"
            "scheduled_message_id": "tools.scheduled_message_id"
          outputParameters:
            - type: object
              mapping: "$."