Letta · Capability

Letta API — MCP Servers

MCP server registry — register external Model Context Protocol servers and expose their tools to agents. 10 operations. Lead operation: Create MCP Server. Self-contained Naftiko capability covering one Letta business surface.

Letta API — MCP Servers is a Naftiko capability published by Letta, one of 36 capabilities the APIs.io network indexes for this provider. It bundles 10 operations across the GET, POST, PATCH, and DELETE methods rooted at /v1/mcp-servers.

The capability includes 5 read-only operations and 5 state-changing operations. Lead operation: Create MCP Server. Can be deployed as a REST endpoint, MCP tool, or Agent Skill via Naftiko.

Tagged areas include Letta, Stateful Agents, and MCP Servers.

Run with Naftiko LettaStateful AgentsMCP Servers

What You Can Do

POST
Mcp_create_mcp_server — Create MCP Server
/v1/mcp-servers/
GET
Mcp_list_mcp_servers — List MCP Servers
/v1/mcp-servers/
GET
Mcp_retrieve_mcp_server — Retrieve MCP Server
/v1/mcp-servers/{mcp-server-id}
DELETE
Mcp_delete_mcp_server — Delete MCP Server
/v1/mcp-servers/{mcp-server-id}
PATCH
Mcp_update_mcp_server — Update MCP Server
/v1/mcp-servers/{mcp-server-id}
GET
Mcp_list_tools_for_mcp_server — List Tools for MCP Server
/v1/mcp-servers/{mcp-server-id}/tools
GET
Mcp_retrieve_mcp_tool — Retrieve MCP Tool
/v1/mcp-servers/{mcp-server-id}/tools/{tool-id}
POST
Mcp_run_tool — Run MCP Tool
/v1/mcp-servers/{mcp-server-id}/tools/{tool-id}/run
PATCH
Mcp_refresh_mcp_server_tools — Refresh MCP Server Tools
/v1/mcp-servers/{mcp-server-id}/refresh
GET
Mcp_connect_mcp_server — Connect MCP Server
/v1/mcp-servers/connect/{mcp-server-id}

MCP Tools

create-mcp-server

Create MCP Server

list-mcp-servers

List MCP Servers

read-only idempotent
retrieve-mcp-server

Retrieve MCP Server

read-only idempotent
delete-mcp-server

Delete MCP Server

idempotent
update-mcp-server

Update MCP Server

idempotent
list-tools-mcp-server

List Tools for MCP Server

read-only idempotent
retrieve-mcp-tool

Retrieve MCP Tool

read-only idempotent
run-mcp-tool

Run MCP Tool

refresh-mcp-server-tools

Refresh MCP Server Tools

idempotent
connect-mcp-server

Connect MCP Server

read-only idempotent

Capability Spec

letta-mcp-servers.yaml Raw ↑ 
naftiko: "1.0.0-alpha2"

info:
  label: "Letta API — MCP Servers"
  description: >-
    MCP server registry — register external Model Context Protocol servers and expose their tools to agents. 10 operations. Lead operation: Create MCP Server. Self-contained Naftiko capability covering one Letta business surface.
  tags:
    - Letta
    - Stateful Agents
    - MCP Servers
  created: "2026-05-08"
  modified: "2026-05-22"

binds:
  - namespace: env
    keys:
      LETTA_API_KEY: LETTA_API_KEY

capability:

  consumes:
    - type: http
      namespace: "letta-mcp-servers"
      baseUri: "https://api.letta.com"
      description: "Letta API — MCP Servers business capability. Self-contained, no shared references."
      authentication:
        type: bearer
        token: "{{env.LETTA_API_KEY}}"
      resources:
        - name: "mcp-servers"
          path: "/v1/mcp-servers/"
          operations:
            - name: "mcp_create_mcp_server"
              method: POST
              description: "Create MCP Server"
              inputParameters:
                - name: "body"
                  in: body
                  type: object
                  required: true
                  description: "Request payload"
              outputRawFormat: json
              outputParameters:
                - name: result
                  type: object
                  value: "$."
            - name: "mcp_list_mcp_servers"
              method: GET
              description: "List MCP Servers"
              outputRawFormat: json
              outputParameters:
                - name: result
                  type: object
                  value: "$."
        - name: "mcp-servers-by-id"
          path: "/v1/mcp-servers/{mcp_server_id}"
          operations:
            - name: "mcp_retrieve_mcp_server"
              method: GET
              description: "Retrieve MCP Server"
              inputParameters:
                - name: "mcp_server_id"
                  in: path
                  type: string
                  required: true
                  description: "mcp_server_id parameter"
              outputRawFormat: json
              outputParameters:
                - name: result
                  type: object
                  value: "$."
            - name: "mcp_delete_mcp_server"
              method: DELETE
              description: "Delete MCP Server"
              inputParameters:
                - name: "mcp_server_id"
                  in: path
                  type: string
                  required: true
                  description: "mcp_server_id parameter"
              outputRawFormat: json
              outputParameters:
                - name: result
                  type: object
                  value: "$."
            - name: "mcp_update_mcp_server"
              method: PATCH
              description: "Update MCP Server"
              inputParameters:
                - name: "mcp_server_id"
                  in: path
                  type: string
                  required: true
                  description: "mcp_server_id parameter"
                - name: "body"
                  in: body
                  type: object
                  required: true
                  description: "Request payload"
              outputRawFormat: json
              outputParameters:
                - name: result
                  type: object
                  value: "$."
        - name: "mcp-servers-by-id-tools"
          path: "/v1/mcp-servers/{mcp_server_id}/tools"
          operations:
            - name: "mcp_list_tools_for_mcp_server"
              method: GET
              description: "List Tools for MCP Server"
              inputParameters:
                - name: "mcp_server_id"
                  in: path
                  type: string
                  required: true
                  description: "mcp_server_id parameter"
              outputRawFormat: json
              outputParameters:
                - name: result
                  type: object
                  value: "$."
        - name: "mcp-servers-by-id-tools-by-id"
          path: "/v1/mcp-servers/{mcp_server_id}/tools/{tool_id}"
          operations:
            - name: "mcp_retrieve_mcp_tool"
              method: GET
              description: "Retrieve MCP Tool"
              inputParameters:
                - name: "mcp_server_id"
                  in: path
                  type: string
                  required: true
                  description: "mcp_server_id parameter"
                - name: "tool_id"
                  in: path
                  type: string
                  required: true
                  description: "tool_id parameter"
              outputRawFormat: json
              outputParameters:
                - name: result
                  type: object
                  value: "$."
        - name: "mcp-servers-by-id-tools-by-id-run"
          path: "/v1/mcp-servers/{mcp_server_id}/tools/{tool_id}/run"
          operations:
            - name: "mcp_run_tool"
              method: POST
              description: "Run MCP Tool"
              inputParameters:
                - name: "mcp_server_id"
                  in: path
                  type: string
                  required: true
                  description: "mcp_server_id parameter"
                - name: "tool_id"
                  in: path
                  type: string
                  required: true
                  description: "tool_id parameter"
                - name: "body"
                  in: body
                  type: object
                  required: true
                  description: "Request payload"
              outputRawFormat: json
              outputParameters:
                - name: result
                  type: object
                  value: "$."
        - name: "mcp-servers-by-id-refresh"
          path: "/v1/mcp-servers/{mcp_server_id}/refresh"
          operations:
            - name: "mcp_refresh_mcp_server_tools"
              method: PATCH
              description: "Refresh MCP Server Tools"
              inputParameters:
                - name: "mcp_server_id"
                  in: path
                  type: string
                  required: true
                  description: "mcp_server_id parameter"
                - name: "agent_id"
                  in: query
                  type: string
                  required: false
                  description: "agent_id parameter"
              outputRawFormat: json
              outputParameters:
                - name: result
                  type: object
                  value: "$."
        - name: "mcp-servers-connect-by-id"
          path: "/v1/mcp-servers/connect/{mcp_server_id}"
          operations:
            - name: "mcp_connect_mcp_server"
              method: GET
              description: "Connect MCP Server"
              inputParameters:
                - name: "mcp_server_id"
                  in: path
                  type: string
                  required: true
                  description: "mcp_server_id parameter"
              outputRawFormat: json
              outputParameters:
                - name: result
                  type: object
                  value: "$."

  exposes:
    - type: rest
      namespace: "letta-mcp-servers-rest"
      port: 8080
      description: "REST adapter for Letta API — MCP Servers. One Spectral-compliant resource per consumed operation."
      resources:
        - path: "/v1/mcp-servers/"
          name: "mcp-servers"
          description: "REST surface for mcp-servers."
          operations:
            - method: POST
              name: "mcp_create_mcp_server"
              description: "Create MCP Server"
              call: "letta-mcp-servers.mcp_create_mcp_server"
              with:
                "body": "rest.body"
              outputParameters:
                - type: object
                  mapping: "$."
            - method: GET
              name: "mcp_list_mcp_servers"
              description: "List MCP Servers"
              call: "letta-mcp-servers.mcp_list_mcp_servers"
              outputParameters:
                - type: object
                  mapping: "$."
        - path: "/v1/mcp-servers/{mcp-server-id}"
          name: "mcp-servers-by-id"
          description: "REST surface for mcp-servers-by-id."
          operations:
            - method: GET
              name: "mcp_retrieve_mcp_server"
              description: "Retrieve MCP Server"
              call: "letta-mcp-servers.mcp_retrieve_mcp_server"
              with:
                "mcp_server_id": "rest.mcp_server_id"
              outputParameters:
                - type: object
                  mapping: "$."
            - method: DELETE
              name: "mcp_delete_mcp_server"
              description: "Delete MCP Server"
              call: "letta-mcp-servers.mcp_delete_mcp_server"
              with:
                "mcp_server_id": "rest.mcp_server_id"
              outputParameters:
                - type: object
                  mapping: "$."
            - method: PATCH
              name: "mcp_update_mcp_server"
              description: "Update MCP Server"
              call: "letta-mcp-servers.mcp_update_mcp_server"
              with:
                "mcp_server_id": "rest.mcp_server_id"
                "body": "rest.body"
              outputParameters:
                - type: object
                  mapping: "$."
        - path: "/v1/mcp-servers/{mcp-server-id}/tools"
          name: "mcp-servers-by-id-tools"
          description: "REST surface for mcp-servers-by-id-tools."
          operations:
            - method: GET
              name: "mcp_list_tools_for_mcp_server"
              description: "List Tools for MCP Server"
              call: "letta-mcp-servers.mcp_list_tools_for_mcp_server"
              with:
                "mcp_server_id": "rest.mcp_server_id"
              outputParameters:
                - type: object
                  mapping: "$."
        - path: "/v1/mcp-servers/{mcp-server-id}/tools/{tool-id}"
          name: "mcp-servers-by-id-tools-by-id"
          description: "REST surface for mcp-servers-by-id-tools-by-id."
          operations:
            - method: GET
              name: "mcp_retrieve_mcp_tool"
              description: "Retrieve MCP Tool"
              call: "letta-mcp-servers.mcp_retrieve_mcp_tool"
              with:
                "mcp_server_id": "rest.mcp_server_id"
                "tool_id": "rest.tool_id"
              outputParameters:
                - type: object
                  mapping: "$."
        - path: "/v1/mcp-servers/{mcp-server-id}/tools/{tool-id}/run"
          name: "mcp-servers-by-id-tools-by-id-run"
          description: "REST surface for mcp-servers-by-id-tools-by-id-run."
          operations:
            - method: POST
              name: "mcp_run_tool"
              description: "Run MCP Tool"
              call: "letta-mcp-servers.mcp_run_tool"
              with:
                "mcp_server_id": "rest.mcp_server_id"
                "tool_id": "rest.tool_id"
                "body": "rest.body"
              outputParameters:
                - type: object
                  mapping: "$."
        - path: "/v1/mcp-servers/{mcp-server-id}/refresh"
          name: "mcp-servers-by-id-refresh"
          description: "REST surface for mcp-servers-by-id-refresh."
          operations:
            - method: PATCH
              name: "mcp_refresh_mcp_server_tools"
              description: "Refresh MCP Server Tools"
              call: "letta-mcp-servers.mcp_refresh_mcp_server_tools"
              with:
                "mcp_server_id": "rest.mcp_server_id"
                "agent_id": "rest.agent_id"
              outputParameters:
                - type: object
                  mapping: "$."
        - path: "/v1/mcp-servers/connect/{mcp-server-id}"
          name: "mcp-servers-connect-by-id"
          description: "REST surface for mcp-servers-connect-by-id."
          operations:
            - method: GET
              name: "mcp_connect_mcp_server"
              description: "Connect MCP Server"
              call: "letta-mcp-servers.mcp_connect_mcp_server"
              with:
                "mcp_server_id": "rest.mcp_server_id"
              outputParameters:
                - type: object
                  mapping: "$."
    - type: mcp
      namespace: "letta-mcp-servers-mcp"
      port: 9090
      transport: http
      description: "MCP adapter for Letta API — MCP Servers. One verb-noun tool per consumed operation."
      tools:
        - name: "create-mcp-server"
          description: "Create MCP Server"
          hints:
            readOnly: false
            destructive: false
            idempotent: false
          call: "letta-mcp-servers.mcp_create_mcp_server"
          with:
            "body": "tools.body"
          outputParameters:
            - type: object
              mapping: "$."
        - name: "list-mcp-servers"
          description: "List MCP Servers"
          hints:
            readOnly: true
            destructive: false
            idempotent: true
          call: "letta-mcp-servers.mcp_list_mcp_servers"
          outputParameters:
            - type: object
              mapping: "$."
        - name: "retrieve-mcp-server"
          description: "Retrieve MCP Server"
          hints:
            readOnly: true
            destructive: false
            idempotent: true
          call: "letta-mcp-servers.mcp_retrieve_mcp_server"
          with:
            "mcp_server_id": "tools.mcp_server_id"
          outputParameters:
            - type: object
              mapping: "$."
        - name: "delete-mcp-server"
          description: "Delete MCP Server"
          hints:
            readOnly: false
            destructive: true
            idempotent: true
          call: "letta-mcp-servers.mcp_delete_mcp_server"
          with:
            "mcp_server_id": "tools.mcp_server_id"
          outputParameters:
            - type: object
              mapping: "$."
        - name: "update-mcp-server"
          description: "Update MCP Server"
          hints:
            readOnly: false
            destructive: false
            idempotent: true
          call: "letta-mcp-servers.mcp_update_mcp_server"
          with:
            "mcp_server_id": "tools.mcp_server_id"
            "body": "tools.body"
          outputParameters:
            - type: object
              mapping: "$."
        - name: "list-tools-mcp-server"
          description: "List Tools for MCP Server"
          hints:
            readOnly: true
            destructive: false
            idempotent: true
          call: "letta-mcp-servers.mcp_list_tools_for_mcp_server"
          with:
            "mcp_server_id": "tools.mcp_server_id"
          outputParameters:
            - type: object
              mapping: "$."
        - name: "retrieve-mcp-tool"
          description: "Retrieve MCP Tool"
          hints:
            readOnly: true
            destructive: false
            idempotent: true
          call: "letta-mcp-servers.mcp_retrieve_mcp_tool"
          with:
            "mcp_server_id": "tools.mcp_server_id"
            "tool_id": "tools.tool_id"
          outputParameters:
            - type: object
              mapping: "$."
        - name: "run-mcp-tool"
          description: "Run MCP Tool"
          hints:
            readOnly: false
            destructive: false
            idempotent: false
          call: "letta-mcp-servers.mcp_run_tool"
          with:
            "mcp_server_id": "tools.mcp_server_id"
            "tool_id": "tools.tool_id"
            "body": "tools.body"
          outputParameters:
            - type: object
              mapping: "$."
        - name: "refresh-mcp-server-tools"
          description: "Refresh MCP Server Tools"
          hints:
            readOnly: false
            destructive: false
            idempotent: true
          call: "letta-mcp-servers.mcp_refresh_mcp_server_tools"
          with:
            "mcp_server_id": "tools.mcp_server_id"
            "agent_id": "tools.agent_id"
          outputParameters:
            - type: object
              mapping: "$."
        - name: "connect-mcp-server"
          description: "Connect MCP Server"
          hints:
            readOnly: true
            destructive: false
            idempotent: true
          call: "letta-mcp-servers.mcp_connect_mcp_server"
          with:
            "mcp_server_id": "tools.mcp_server_id"
          outputParameters:
            - type: object
              mapping: "$."