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

# Send a Dex conversation message

> Steers the active task or resumes an expired thread through the metered web-channel dispatch path. This endpoint uses the stricter managed-agent run limiter.



## OpenAPI

````yaml /openapi.json post /projects/{projectId}/agents/dex/threads/{threadId}/messages
openapi: 3.1.0
info:
  title: DevTune API
  version: 2.0.0
  description: >-
    API for programmatic access to your AI visibility data, webhook
    subscriptions, and automation workflows. Use this API to integrate DevTune
    data into CI/CD pipelines, BI tools, AI agents, and operational systems.
servers:
  - url: https://devtune.ai/api/v2
    description: Production
security:
  - bearerAuth: []
paths:
  /projects/{projectId}/agents/dex/threads/{threadId}/messages:
    post:
      summary: Send a Dex conversation message
      description: >-
        Steers the active task or resumes an expired thread through the metered
        web-channel dispatch path. This endpoint uses the stricter managed-agent
        run limiter.
      operationId: sendDexConversationMessage
      parameters:
        - name: projectId
          in: path
          required: true
          schema:
            type: string
            format: uuid
        - name: threadId
          in: path
          required: true
          description: Dex conversation thread identifier.
          schema:
            type: string
            format: uuid
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              additionalProperties: false
              properties:
                message:
                  type: string
                  minLength: 1
                  maxLength: 4000
                messageId:
                  type: string
                  format: uuid
              required:
                - message
                - messageId
      responses:
        '200':
          description: Dex conversation message outcome
          content:
            application/json:
              schema:
                type: object
                properties:
                  data:
                    $ref: '#/components/schemas/DexConversationMessageResult'
                  meta:
                    $ref: '#/components/schemas/Meta'
                required:
                  - data
                  - meta
        '400':
          $ref: '#/components/responses/BadRequestError'
        '401':
          $ref: '#/components/responses/UnauthorizedError'
        '402':
          description: Dex access or managed-agent credits are required
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '403':
          $ref: '#/components/responses/ForbiddenError'
        '404':
          $ref: '#/components/responses/NotFoundError'
        '409':
          $ref: '#/components/responses/ConflictError'
        '429':
          $ref: '#/components/responses/RateLimitExceededError'
components:
  schemas:
    DexConversationMessageResult:
      type: object
      properties:
        status:
          type: string
          enum:
            - queued
            - resumed
            - steered
        taskId:
          type:
            - string
            - 'null'
          format: uuid
      required:
        - status
        - taskId
    Meta:
      type: object
      properties:
        timestamp:
          type: string
          format: date-time
        projectId:
          type: string
          format: uuid
    Error:
      type: object
      properties:
        error:
          type: string
        message:
          type: string
        status:
          type: integer
      required:
        - error
        - message
        - status
  responses:
    BadRequestError:
      description: Bad request
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    UnauthorizedError:
      description: Unauthorized
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    ForbiddenError:
      description: Forbidden
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    NotFoundError:
      description: Not found
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    ConflictError:
      description: Request conflicts with current resource state
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    RateLimitExceededError:
      description: Rate limit exceeded
      headers:
        X-RateLimit-Limit:
          $ref: '#/components/headers/X-RateLimit-Limit'
        X-RateLimit-Remaining:
          $ref: '#/components/headers/X-RateLimit-Remaining'
        X-RateLimit-Reset:
          $ref: '#/components/headers/X-RateLimit-Reset'
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  headers:
    X-RateLimit-Limit:
      description: Maximum requests per window
      schema:
        type: integer
    X-RateLimit-Remaining:
      description: Requests remaining in current window
      schema:
        type: integer
    X-RateLimit-Reset:
      description: Unix timestamp when the window resets
      schema:
        type: integer
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: >-
        API key with dtk_live_ prefix. Obtain it from API Keys in the account
        sidebar. New keys start with all supported scopes selected for the
        chosen project, and you can narrow them to specific read/write scopes as
        needed.

````