Devin Messages API

openapi: 3.0.3
info:
  title: Devin API (Cognition Labs)
  description: >-
    The Devin API lets you create and drive Devin, Cognition's autonomous AI
    software engineer, programmatically. This document models the legacy v1
    surface (api.devin.ai/v1, still live and documented, authenticated with
    apk_user_*/apk_* keys) in full - sessions, messages, attachments,
    knowledge, playbooks, and secrets - plus representative endpoints from the
    current v3 organizations/enterprise surface (api.devin.ai/v3,
    authenticated with cog_ service-user or personal access tokens) and the
    v2/v3 consumption (ACU usage) endpoints. The v2/v3 enterprise surface has
    additional organization, member, and API-key management endpoints not
    exhaustively modeled here; see the humanURL/APIReference links in
    apis.yml for the full documented set. All endpoints are transcribed from
    Cognition's public documentation at https://docs.devin.ai and have not
    been exercised against production credentials, which require an active
    paid Devin plan or Enterprise contract.
  version: '1.0'
  contact:
    name: Cognition
    url: https://cognition.ai
  license:
    name: Proprietary
    url: https://docs.devin.ai/admin/security
servers:
  - url: https://api.devin.ai/v1
    description: Legacy v1 API (apk_user_*/apk_* keys)
  - url: https://api.devin.ai/v3
    description: Current v3 organizations/enterprise API (cog_ keys)
security:
  - bearerAuth: []
tags:
  - name: Sessions
    description: Create and manage Devin sessions (v1 legacy surface).
  - name: Messages
    description: Send and read messages within a running session.
  - name: Attachments
    description: Upload and download files for Devin to work with.
  - name: Knowledge
    description: Organization knowledge entries and folders.
  - name: Playbooks
    description: Reusable team playbooks that seed new sessions.
  - name: Secrets
    description: Encrypted credentials Devin can use inside sessions.
  - name: Organizations (v3)
    description: Current org-scoped session and user management.
  - name: Enterprise (v3)
    description: Cross-organization administration.
  - name: Consumption
    description: Agent Compute Unit (ACU) usage and billing metrics.
paths:
  /sessions:
    post:
      operationId: createSession
      tags:
        - Sessions
      summary: Create a new Devin session
      description: >-
        Creates a new Devin session from a natural-language prompt, optionally
        seeded with a playbook, snapshot, knowledge, secrets, tags, and a max
        ACU cap.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/CreateSessionInput'
      responses:
        '200':
          description: The created (or, if idempotent and matched, existing) session.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/CreateSessionResponse'
        '422':
          $ref: '#/components/responses/ValidationError'
    get:
      operationId: listSessions
      tags:
        - Sessions
      summary: List sessions
      description: Lists sessions for the organization, with optional filters.
      parameters:
        - name: limit
          in: query
          schema:
            type: integer
            default: 100
        - name: offset
          in: query
          schema:
            type: integer
            default: 0
        - name: skip
          in: query
          schema:
            type: integer
        - name: tags
          in: query
          description: Filter sessions by tag.
          schema:
            type: array
            items:
              type: string
          style: form
          explode: true
        - name: user_email
          in: query
          description: Filter sessions by the creator's email address.
          schema:
            type: string
      responses:
        '200':
          description: A page of sessions.
          content:
            application/json:
              schema:
                type: object
                properties:
                  sessions:
                    type: array
                    items:
                      $ref: '#/components/schemas/SessionSummary'
        '422':
          $ref: '#/components/responses/ValidationError'
  /sessions/{session_id}:
    parameters:
      - $ref: '#/components/parameters/SessionId'
    get:
      operationId: getSession
      tags:
        - Sessions
      summary: Retrieve session details
      description: Retrieves full status, message history, and structured output for a session.
      responses:
        '200':
          description: The requested session.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SessionDetail'
        '422':
          $ref: '#/components/responses/ValidationError'
    delete:
      operationId: terminateSession
      tags:
        - Sessions
      summary: Terminate a session
      description: Terminates a running session. The session must not already be in an exited state.
      responses:
        '200':
          description: Termination confirmation.
          content:
            application/json:
              schema:
                type: object
                properties:
                  detail:
                    type: string
        '422':
          $ref: '#/components/responses/ValidationError'
  /sessions/{session_id}/tags:
    parameters:
      - $ref: '#/components/parameters/SessionId'
    put:
      operationId: updateSessionTags
      tags:
        - Sessions
      summary: Update session tags
      description: Replaces the tag list on a session (maximum 50 tags).
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
                - tags
              properties:
                tags:
                  type: array
                  maxItems: 50
                  items:
                    type: string
      responses:
        '200':
          description: Confirmation.
          content:
            application/json:
              schema:
                type: object
                properties:
                  detail:
                    type: string
        '422':
          $ref: '#/components/responses/ValidationError'
  /sessions/{session_id}/message:
    parameters:
      - $ref: '#/components/parameters/SessionId'
    post:
      operationId: sendMessage
      tags:
        - Messages
      summary: Send a message to a session
      description: >-
        Sends a follow-up message into a running session. The session must be
        in a running state to receive it; sending a message also wakes a
        sleeping session.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
                - message
              properties:
                message:
                  type: string
      responses:
        '200':
          description: Message accepted, or a detail note if the session was already suspended.
          content:
            application/json:
              schema:
                type: object
                nullable: true
                properties:
                  detail:
                    type: string
        '422':
          $ref: '#/components/responses/ValidationError'
  /attachments:
    post:
      operationId: uploadAttachment
      tags:
        - Attachments
      summary: Upload a file for Devin to work with
      description: >-
        Uploads a file and returns its URL. Reference the returned URL in a
        session prompt as ATTACHMENT:"{file_url}" on its own line.
      requestBody:
        required: true
        content:
          multipart/form-data:
            schema:
              type: object
              required:
                - file
              properties:
                file:
                  type: string
                  format: binary
      responses:
        '200':
          description: The uploaded file's URL.
          content:
            application/json:
              schema:
                type: string
        '422':
          $ref: '#/components/responses/ValidationError'
  /attachments/{attachment_id}:
    parameters:
      - name: attachment_id
        in: path
        required: true
        schema:
          type: string
    get:
      operationId: downloadAttachment
      tags:
        - Attachments
      summary: Download an attachment file
      responses:
        '200':
          description: The raw attachment file contents.
          content:
            application/octet-stream:
              schema:
                type: string
                format: binary
        '422':
          $ref: '#/components/responses/ValidationError'
  /knowledge:
    get:
      operationId: listKnowledge
      tags:
        - Knowledge
      summary: List all knowledge entries and folders
      responses:
        '200':
          description: Knowledge entries and folders for the organization.
          content:
            application/json:
              schema:
                type: object
                properties:
                  knowledge:
                    type: array
                    items:
                      $ref: '#/components/schemas/KnowledgeEntry'
                  folders:
                    type: array
                    items:
                      $ref: '#/components/schemas/KnowledgeFolder'
    post:
      operationId: createKnowledge
      tags:
        - Knowledge
      summary: Create a knowledge entry
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/KnowledgeInput'
      responses:
        '200':
          description: The created knowledge entry.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/KnowledgeEntry'
        '422':
          $ref: '#/components/responses/ValidationError'
  /knowledge/{knowledge_id}:
    parameters:
      - name: knowledge_id
        in: path
        required: true
        schema:
          type: string
    put:
      operationId: updateKnowledge
      tags:
        - Knowledge
      summary: Update a knowledge entry
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/KnowledgeInput'
      responses:
        '200':
          description: The updated knowledge entry.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/KnowledgeEntry'
        '422':
          $ref: '#/components/responses/ValidationError'
    delete:
      operationId: deleteKnowledge
      tags:
        - Knowledge
      summary: Delete a knowledge entry
      responses:
        '200':
          description: Deletion confirmation.
          content:
            application/json:
              schema:
                type: object
                properties:
                  detail:
                    type: string
        '422':
          $ref: '#/components/responses/ValidationError'
  /playbooks:
    get:
      operationId: listPlaybooks
      tags:
        - Playbooks
      summary: List all team playbooks
      responses:
        '200':
          description: The organization's playbooks.
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/Playbook'
    post:
      operationId: createPlaybook
      tags:
        - Playbooks
      summary: Create a playbook
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/PlaybookInput'
      responses:
        '200':
          description: The created playbook.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Playbook'
        '422':
          $ref: '#/components/responses/ValidationError'
  /playbooks/{playbook_id}:
    parameters:
      - name: playbook_id
        in: path
        required: true
        schema:
          type: string
    get:
      operationId: getPlaybook
      tags:
        - Playbooks
      summary: Get a playbook
      responses:
        '200':
          description: The requested playbook.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Playbook'
        '422':
          $ref: '#/components/responses/ValidationError'
    put:
      operationId: updatePlaybook
      tags:
        - Playbooks
      summary: Update a playbook
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/PlaybookInput'
      responses:
        '200':
          description: The updated playbook.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Playbook'
        '422':
          $ref: '#/components/responses/ValidationError'
    delete:
      operationId: deletePlaybook
      tags:
        - Playbooks
      summary: Delete a playbook
      responses:
        '200':
          description: Deletion confirmation.
          content:
            application/json:
              schema:
                type: object
                properties:
                  detail:
                    type: string
        '422':
          $ref: '#/components/responses/ValidationError'
  /secrets:
    get:
      operationId: listSecrets
      tags:
        - Secrets
      summary: List all secrets
      description: Returns secret metadata only, never secret values.
      responses:
        '200':
          description: The organization's secret metadata.
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/SecretMetadata'
    post:
      operationId: createSecret
      tags:
        - Secrets
      summary: Create a secret
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/SecretInput'
      responses:
        '200':
          description: The created secret's identifier.
          content:
            application/json:
              schema:
                type: object
                properties:
                  id:
                    type: string
        '422':
          $ref: '#/components/responses/ValidationError'
  /secrets/{secret_id}:
    parameters:
      - name: secret_id
        in: path
        required: true
        schema:
          type: string
    delete:
      operationId: deleteSecret
      tags:
        - Secrets
      summary: Delete a secret
      responses:
        '200':
          description: Deletion confirmation.
          content:
            application/json:
              schema:
                type: object
                properties:
                  detail:
                    type: string
        '422':
          $ref: '#/components/responses/ValidationError'
  /organizations/{org_id}/sessions:
    parameters:
      - $ref: '#/components/parameters/OrgId'
    post:
      operationId: createOrganizationSession
      tags:
        - Organizations (v3)
      summary: Create a session (v3, organization-scoped)
      description: >-
        v3 equivalent of POST /sessions, scoped to an organization and served
        from https://api.devin.ai/v3. Supports create_as_user_id to attribute
        the session to a specific organization member.
      servers:
        - url: https://api.devin.ai/v3
      requestBody:
        required: true
        content:
          application/json:
            schema:
              allOf:
                - $ref: '#/components/schemas/CreateSessionInput'
                - type: object
                  properties:
                    create_as_user_id:
                      type: string
                      description: Attribute the session to this organization user.
      responses:
        '200':
          description: The created session.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/CreateSessionResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '422':
          $ref: '#/components/responses/ValidationError'
  /organizations/members/users:
    get:
      operationId: listOrganizationUsers
      tags:
        - Organizations (v3)
      summary: List organization users (v3)
      description: Lists users in the organization, for use with create_as_user_id.
      servers:
        - url: https://api.devin.ai/v3
      responses:
        '200':
          description: A list of organization users.
          content:
            application/json:
              schema:
                type: object
                properties:
                  users:
                    type: array
                    items:
                      type: object
                      properties:
                        id:
                          type: string
                        email:
                          type: string
                        full_name:
                          type: string
        '401':
          $ref: '#/components/responses/Unauthorized'
  /enterprise/organizations:
    get:
      operationId: listEnterpriseOrganizations
      tags:
        - Enterprise (v3)
      summary: List enterprise organizations
      description: Lists every organization under the enterprise account.
      servers:
        - url: https://api.devin.ai/v3
      responses:
        '200':
          description: A list of organizations.
          content:
            application/json:
              schema:
                type: object
                properties:
                  organizations:
                    type: array
                    items:
                      type: object
                      properties:
                        id:
                          type: string
                        name:
                          type: string
        '401':
          $ref: '#/components/responses/Unauthorized'
  /enterprise/audit-logs:
    get:
      operationId: listEnterpriseAuditLogs
      tags:
        - Enterprise (v3)
      summary: List enterprise audit logs
      description: Paginated audit log entries with time-based filtering.
      servers:
        - url: https://api.devin.ai/v3
      parameters:
        - name: start_time
          in: query
          description: Unix timestamp (seconds) lower bound.
          schema:
            type: integer
        - name: end_time
          in: query
          description: Unix timestamp (seconds) upper bound.
          schema:
            type: integer
        - name: cursor
          in: query
          schema:
            type: string
      responses:
        '200':
          description: A page of audit log entries.
          content:
            application/json:
              schema:
                type: object
                properties:
                  entries:
                    type: array
                    items:
                      type: object
                      additionalProperties: true
                  next_cursor:
                    type: string
                    nullable: true
        '401':
          $ref: '#/components/responses/Unauthorized'
  /enterprise/consumption/daily:
    get:
      operationId: getEnterpriseDailyConsumption
      tags:
        - Consumption
      summary: Get daily ACU consumption for the enterprise
      servers:
        - url: https://api.devin.ai/v3
      parameters:
        - name: start_time
          in: query
          description: Unix timestamp (seconds) lower bound.
          schema:
            type: integer
        - name: end_time
          in: query
          description: Unix timestamp (seconds) upper bound.
          schema:
            type: integer
      responses:
        '200':
          description: Daily ACU consumption totals.
          content:
            application/json:
              schema:
                type: object
                properties:
                  days:
                    type: array
                    items:
                      type: object
                      properties:
                        date:
                          type: string
                          format: date
                        acu_consumed:
                          type: number
        '401':
          $ref: '#/components/responses/Unauthorized'
  /organizations/{org_id}/consumption/sessions:
    parameters:
      - $ref: '#/components/parameters/OrgId'
    get:
      operationId: getSessionDailyConsumption
      tags:
        - Consumption
      summary: Get per-session daily ACU consumption
      servers:
        - url: https://api.devin.ai/v3
      parameters:
        - name: start_time
          in: query
          schema:
            type: integer
        - name: end_time
          in: query
          schema:
            type: integer
      responses:
        '200':
          description: Per-session daily ACU consumption.
          content:
            application/json:
              schema:
                type: object
                properties:
                  sessions:
                    type: array
                    items:
                      type: object
                      properties:
                        session_id:
                          type: string
                        date:
                          type: string
                          format: date
                        acu_consumed:
                          type: number
        '401':
          $ref: '#/components/responses/Unauthorized'
components:
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: >-
        v1/v2 keys are prefixed apk_user_* (personal) or apk_* (service). The
        current v3 API uses service-user or personal access tokens prefixed
        cog_. Passed as `Authorization: Bearer YOUR_API_KEY`.
  parameters:
    SessionId:
      name: session_id
      in: path
      required: true
      description: The unique identifier of the session.
      schema:
        type: string
    OrgId:
      name: org_id
      in: path
      required: true
      description: The organization ID, found in Settings > Service Users.
      schema:
        type: string
  responses:
    Unauthorized:
      description: Missing or invalid bearer token.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ValidationErrorBody'
    ValidationError:
      description: The request payload failed validation.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ValidationErrorBody'
  schemas:
    ValidationErrorBody:
      type: object
      properties:
        detail:
          type: array
          items:
            type: object
            properties:
              loc:
                type: array
                items:
                  type: string
              msg:
                type: string
              type:
                type: string
    CreateSessionInput:
      type: object
      required:
        - prompt
      properties:
        prompt:
          type: string
          description: The task prompt for Devin to work on.
        title:
          type: string
          description: Custom session name; auto-generated if omitted.
        snapshot_id:
          type: string
        playbook_id:
          type: string
        knowledge_ids:
          type: array
          items:
            type: string
          nullable: true
          description: Null uses all knowledge; empty array uses none.
        secret_ids:
          type: array
          items:
            type: string
          nullable: true
          description: Null uses all secrets; empty array uses none.
        session_secrets:
          type: array
          items:
            type: object
            properties:
              key:
                type: string
              value:
                type: string
              sensitive:
                type: boolean
        structured_output_schema:
          type: object
          description: JSON Schema (Draft 7) for validating structured output. Max 64KB.
          additionalProperties: true
        tags:
          type: array
          maxItems: 50
          items:
            type: string
        max_acu_limit:
          type: integer
          description: Maximum ACU allowance for the session.
        idempotent:
          type: boolean
          default: false
        unlisted:
          type: boolean
          default: false
    CreateSessionResponse:
      type: object
      required:
        - session_id
        - url
      properties:
        session_id:
          type: string
        url:
          type: string
        is_new_session:
          type: boolean
    SessionStatusEnum:
      type: string
      enum:
        - working
        - blocked
        - expired
        - finished
        - suspend_requested
        - suspend_requested_frontend
        - resume_requested
        - resume_requested_frontend
        - resumed
    SessionSummary:
      type: object
      required:
        - session_id
        - status
        - created_at
        - updated_at
      properties:
        session_id:
          type: string
        status:
          type: string
        status_enum:
          $ref: '#/components/schemas/SessionStatusEnum'
        created_at:
          type: string
          format: date-time
        updated_at:
          type: string
          format: date-time
        title:
          type: string
        requesting_user_email:
          type: string
        playbook_id:
          type: string
        snapshot_id:
          type: string
        tags:
          type: array
          items:
            type: string
        pull_request:
          type: object
          properties:
            url:
              type: string
        structured_output:
          type: object
          additionalProperties: true
    SessionDetail:
      allOf:
        - $ref: '#/components/schemas/SessionSummary'
        - type: object
          properties:
            messages:
              type: array
              default: []
              items:
                type: object
                additionalProperties: true
    KnowledgeInput:
      type: object
      required:
        - name
        - body
        - trigger_description
      properties:
        name:
          type: string
        body:
          type: string
        trigger_description:
          type: string
          description: Describes when this knowledge entry should apply.
        macro:
          type: string
        parent_folder_id:
          type: string
        pinned_repo:
          type: string
    KnowledgeEntry:
      allOf:
        - $ref: '#/components/schemas/KnowledgeInput'
        - type: object
          properties:
            id:
              type: string
            created_at:
              type: string
              format: date-time
            created_by:
              type: object
              properties:
                full_name:
                  type: string
                id:
                  type: string
                  nullable: true
                image_url:
                  type: string
                  nullable: true
    KnowledgeFolder:
      type: object
      properties:
        id:
          type: string
        name:
          type: string
        description:
          type: string
        created_at:
          type: string
          format: date-time
    PlaybookInput:
      type: object
      required:
        - title
        - body
      properties:
        title:
          type: string
        body:
          type: string
        macro:
          type: string
        access_type:
          type: string
    Playbook:
      allOf:
        - $ref: '#/components/schemas/PlaybookInput'
        - type: object
          properties:
            playbook_id:
              type: string
            status:
              type: string
            org_id:
              type: string
            created_at:
              type: string
              format: date-time
              nullable: true
            updated_at:
              type: string
              format: date-time
              nullable: true
            created_by_user_id:
              type: string
              nullable: true
            created_by_user_name:
              type: string
              nullable: true
    SecretInput:
      type: object
      required:
        - type
        - key
        - value
      properties:
        type:
          type: string
          enum:
            - cookie
            - key-value
            - dictionary
            - totp
        key:
          type: string
          description: Unique name for the secret within the organization.
        value:
          type: string
          description: The secret value to store. Encrypted at rest.
        sensitive:
          type: boolean
          description: Whether the value is redacted in logs.
        note:
          type: string
    SecretMetadata:
      type: object
      properties:
        id:
          type: string
        type:
          type: string
          enum:
            - cookie
            - key-value
            - dictionary
            - totp
        key:
          type: string
          nullable: true
        created_at:
          type: string
          format: date-time
          nullable: true