> ## Documentation Index
> Fetch the complete documentation index at: https://docs.archal.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Send a Streamable HTTP MCP request to an environment

> Use only the provider-shaped, session-scoped credential returned beside mcpUrl. Archal validates its session, environment, and lease binding before proxying the MCP request. Workspace control-plane credentials are rejected.



## OpenAPI

````yaml /api-reference/openapi.json post /v1/sessions/{sessionId}/environments/{environmentId}/mcp
openapi: 3.1.0
info:
  title: Archal API
  version: 1.0.0
  summary: >-
    Stateful testing environments with separate lifecycle and provider-scoped
    credentials
  description: >-
    Use a workspace credential for lifecycle operations. Each created
    environment returns a short-lived provider-shaped credential for its
    isolated data plane; the workspace credential is never forwarded to or
    accepted by provider-compatible endpoints.
servers:
  - url: https://api.archal.ai
security: []
paths:
  /v1/sessions/{sessionId}/environments/{environmentId}/mcp:
    post:
      summary: Send a Streamable HTTP MCP request to an environment
      description: >-
        Use only the provider-shaped, session-scoped credential returned beside
        mcpUrl. Archal validates its session, environment, and lease binding
        before proxying the MCP request. Workspace control-plane credentials are
        rejected.
      operationId: callEnvironmentMcp
      parameters:
        - name: sessionId
          in: path
          required: true
          schema:
            type: string
            minLength: 1
        - name: environmentId
          in: path
          required: true
          schema:
            type: string
            minLength: 1
            maxLength: 80
        - name: Mcp-Session-Id
          in: header
          required: false
          schema:
            type: string
        - name: X-Request-Id
          in: header
          required: false
          schema:
            type: string
            pattern: ^[A-Za-z0-9._:-]{1,128}$
      requestBody:
        required: true
        content:
          application/json:
            schema:
              oneOf:
                - type: 'null'
                - type: boolean
                - type: number
                - type: string
                - type: array
                  items: {}
                - type: object
                  additionalProperties: true
      responses:
        '200':
          description: Streamable HTTP MCP response
          content:
            application/json:
              schema:
                oneOf:
                  - type: 'null'
                  - type: boolean
                  - type: number
                  - type: string
                  - type: array
                    items: {}
                  - type: object
                    additionalProperties: true
        '202':
          description: MCP notification accepted
          content:
            application/json:
              schema:
                oneOf:
                  - type: 'null'
                  - type: boolean
                  - type: number
                  - type: string
                  - type: array
                    items: {}
                  - type: object
                    additionalProperties: true
        '400':
          description: The request was rejected
          headers:
            X-Request-Id:
              description: Request correlation identifier
              schema:
                type: string
            Retry-After:
              description: Seconds to wait before retrying when present
              schema:
                type: integer
                minimum: 0
          content:
            application/json:
              schema:
                type: object
                properties:
                  ok:
                    type: boolean
                  error:
                    type: string
                  code:
                    type: string
                  message:
                    type: string
                  requestId:
                    type: string
                  issues:
                    type: array
                    items:
                      type: object
                      properties:
                        path:
                          type: string
                        message:
                          type: string
                      required:
                        - path
                        - message
                      additionalProperties: true
                additionalProperties: true
        '401':
          description: The request was rejected
          headers:
            X-Request-Id:
              description: Request correlation identifier
              schema:
                type: string
            Retry-After:
              description: Seconds to wait before retrying when present
              schema:
                type: integer
                minimum: 0
          content:
            application/json:
              schema:
                type: object
                properties:
                  ok:
                    type: boolean
                  error:
                    type: string
                  code:
                    type: string
                  message:
                    type: string
                  requestId:
                    type: string
                  issues:
                    type: array
                    items:
                      type: object
                      properties:
                        path:
                          type: string
                        message:
                          type: string
                      required:
                        - path
                        - message
                      additionalProperties: true
                additionalProperties: true
        '403':
          description: The request was rejected
          headers:
            X-Request-Id:
              description: Request correlation identifier
              schema:
                type: string
            Retry-After:
              description: Seconds to wait before retrying when present
              schema:
                type: integer
                minimum: 0
          content:
            application/json:
              schema:
                type: object
                properties:
                  ok:
                    type: boolean
                  error:
                    type: string
                  code:
                    type: string
                  message:
                    type: string
                  requestId:
                    type: string
                  issues:
                    type: array
                    items:
                      type: object
                      properties:
                        path:
                          type: string
                        message:
                          type: string
                      required:
                        - path
                        - message
                      additionalProperties: true
                additionalProperties: true
        '404':
          description: The request was rejected
          headers:
            X-Request-Id:
              description: Request correlation identifier
              schema:
                type: string
            Retry-After:
              description: Seconds to wait before retrying when present
              schema:
                type: integer
                minimum: 0
          content:
            application/json:
              schema:
                type: object
                properties:
                  ok:
                    type: boolean
                  error:
                    type: string
                  code:
                    type: string
                  message:
                    type: string
                  requestId:
                    type: string
                  issues:
                    type: array
                    items:
                      type: object
                      properties:
                        path:
                          type: string
                        message:
                          type: string
                      required:
                        - path
                        - message
                      additionalProperties: true
                additionalProperties: true
        '409':
          description: The request was rejected
          headers:
            X-Request-Id:
              description: Request correlation identifier
              schema:
                type: string
            Retry-After:
              description: Seconds to wait before retrying when present
              schema:
                type: integer
                minimum: 0
          content:
            application/json:
              schema:
                type: object
                properties:
                  ok:
                    type: boolean
                  error:
                    type: string
                  code:
                    type: string
                  message:
                    type: string
                  requestId:
                    type: string
                  issues:
                    type: array
                    items:
                      type: object
                      properties:
                        path:
                          type: string
                        message:
                          type: string
                      required:
                        - path
                        - message
                      additionalProperties: true
                additionalProperties: true
        '429':
          description: The request was rejected
          headers:
            X-Request-Id:
              description: Request correlation identifier
              schema:
                type: string
            Retry-After:
              description: Seconds to wait before retrying when present
              schema:
                type: integer
                minimum: 0
          content:
            application/json:
              schema:
                type: object
                properties:
                  ok:
                    type: boolean
                  error:
                    type: string
                  code:
                    type: string
                  message:
                    type: string
                  requestId:
                    type: string
                  issues:
                    type: array
                    items:
                      type: object
                      properties:
                        path:
                          type: string
                        message:
                          type: string
                      required:
                        - path
                        - message
                      additionalProperties: true
                additionalProperties: true
        '500':
          description: The request was rejected
          headers:
            X-Request-Id:
              description: Request correlation identifier
              schema:
                type: string
            Retry-After:
              description: Seconds to wait before retrying when present
              schema:
                type: integer
                minimum: 0
          content:
            application/json:
              schema:
                type: object
                properties:
                  ok:
                    type: boolean
                  error:
                    type: string
                  code:
                    type: string
                  message:
                    type: string
                  requestId:
                    type: string
                  issues:
                    type: array
                    items:
                      type: object
                      properties:
                        path:
                          type: string
                        message:
                          type: string
                      required:
                        - path
                        - message
                      additionalProperties: true
                additionalProperties: true
        '502':
          description: The request was rejected
          headers:
            X-Request-Id:
              description: Request correlation identifier
              schema:
                type: string
            Retry-After:
              description: Seconds to wait before retrying when present
              schema:
                type: integer
                minimum: 0
          content:
            application/json:
              schema:
                type: object
                properties:
                  ok:
                    type: boolean
                  error:
                    type: string
                  code:
                    type: string
                  message:
                    type: string
                  requestId:
                    type: string
                  issues:
                    type: array
                    items:
                      type: object
                      properties:
                        path:
                          type: string
                        message:
                          type: string
                      required:
                        - path
                        - message
                      additionalProperties: true
                additionalProperties: true
        '503':
          description: The request was rejected
          headers:
            X-Request-Id:
              description: Request correlation identifier
              schema:
                type: string
            Retry-After:
              description: Seconds to wait before retrying when present
              schema:
                type: integer
                minimum: 0
          content:
            application/json:
              schema:
                type: object
                properties:
                  ok:
                    type: boolean
                  error:
                    type: string
                  code:
                    type: string
                  message:
                    type: string
                  requestId:
                    type: string
                  issues:
                    type: array
                    items:
                      type: object
                      properties:
                        path:
                          type: string
                        message:
                          type: string
                      required:
                        - path
                        - message
                      additionalProperties: true
                additionalProperties: true
        '504':
          description: The request was rejected
          headers:
            X-Request-Id:
              description: Request correlation identifier
              schema:
                type: string
            Retry-After:
              description: Seconds to wait before retrying when present
              schema:
                type: integer
                minimum: 0
          content:
            application/json:
              schema:
                type: object
                properties:
                  ok:
                    type: boolean
                  error:
                    type: string
                  code:
                    type: string
                  message:
                    type: string
                  requestId:
                    type: string
                  issues:
                    type: array
                    items:
                      type: object
                      properties:
                        path:
                          type: string
                        message:
                          type: string
                      required:
                        - path
                        - message
                      additionalProperties: true
                additionalProperties: true
      security:
        - providerScopedCredential: []
components:
  securitySchemes:
    providerScopedCredential:
      type: apiKey
      in: header
      name: Authorization
      description: >-
        Representative OpenAPI security field. The exact provider-shaped header
        names and values are returned in environments.*.credentials.headers and
        are authoritative.

````