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

# Post agents a2atasks cancel



## OpenAPI

````yaml /openapi.json post /agents/{agentId}/a2a/tasks/{taskId}/cancel
openapi: 3.1.1
info:
  title: Anima API
  version: 0.1.0
  description: >-
    The Anima API provides programmatic access to unified infrastructure for AI
    agents: create and manage agents; send and receive email; place phone calls
    and send/receive SMS and voice; store and retrieve vault credentials; manage
    agent identity; and configure webhooks for real-time events. Authenticate
    using a Bearer token or an API key passed via the X-API-Key header.
  contact:
    name: Anima Labs
    url: https://useanima.sh
    email: support@useanima.sh
  license:
    name: MIT
    url: https://opensource.org/licenses/MIT
servers:
  - url: https://api.useanima.sh/v1
    description: Production
security:
  - BearerAuth: []
  - ApiKeyAuth: []
tags:
  - name: Agents
    description: Create and manage AI agents with email and phone capabilities
  - name: Inboxes
    description: Manage email inboxes and their configurations
  - name: Messages
    description: Send, receive, and search email messages
  - name: Webhooks
    description: Register and manage webhook subscriptions for real-time events
  - name: Organizations
    description: Manage organizations and team settings
  - name: Domains
    description: Configure and verify custom email domains
  - name: Phone
    description: Manage phone numbers and SMS/voice capabilities
  - name: Invoices
    description: Track invoices, match receipts, and reconcile payments
  - name: Billing
    description: View usage, tiers, and billing information
  - name: Security
    description: Configure security policies and access controls
  - name: Vault
    description: Store and retrieve encrypted secrets
  - name: API Keys
    description: Create and manage API keys for programmatic access
paths:
  /agents/{agentId}/a2a/tasks/{taskId}/cancel:
    post:
      operationId: a2a.cancelTask
      parameters:
        - name: agentId
          in: path
          required: true
          schema:
            type: string
            pattern: ^[0-9A-HJKMNP-TV-Z]{26}$
            description: ID of the agent that owns the task
        - name: taskId
          in: path
          required: true
          schema:
            type: string
            pattern: ^[0-9A-HJKMNP-TV-Z]{26}$
            description: ID of the task to cancel
      requestBody:
        required: false
        content:
          application/json:
            schema:
              type: object
              properties: {}
              required: []
              description: Parameters for canceling an A2A task
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                type: object
                properties:
                  id:
                    type: string
                    pattern: ^[0-9A-HJKMNP-TV-Z]{26}$
                    description: Unique task identifier
                  agentId:
                    type: string
                    pattern: ^[0-9A-HJKMNP-TV-Z]{26}$
                    description: ID of the receiving agent
                  orgId:
                    type: string
                    pattern: ^[0-9A-HJKMNP-TV-Z]{26}$
                    description: Organization that owns the receiving agent
                  fromDid:
                    type: string
                    description: Sender DID
                  toDid:
                    type: string
                    description: Receiver DID
                  type:
                    type: string
                    description: Task type
                  status:
                    enum:
                      - submitted
                      - working
                      - input_required
                      - completed
                      - failed
                      - canceled
                    type: string
                    description: Current status of the A2A task
                  input:
                    type: object
                    additionalProperties: {}
                    description: Task input payload
                  output:
                    anyOf:
                      - type: object
                        additionalProperties: {}
                      - type: 'null'
                    description: Task output payload
                  error:
                    anyOf:
                      - type: object
                        properties:
                          code:
                            type: string
                            description: Error code
                          message:
                            type: string
                            description: Error message
                        required:
                          - code
                          - message
                      - type: 'null'
                    description: Error details if task failed
                  history:
                    type: array
                    items:
                      type: object
                      properties:
                        status:
                          enum:
                            - submitted
                            - working
                            - input_required
                            - completed
                            - failed
                            - canceled
                          type: string
                          description: Current status of the A2A task
                        message:
                          type: string
                          description: Human-readable status message
                        timestamp:
                          type: string
                          format: date-time
                          description: ISO-8601 timestamp of the event
                      required:
                        - status
                        - timestamp
                      description: A single status-change event in the task history
                    description: Status change history
                  createdAt:
                    type: string
                    format: date-time
                    description: Task creation timestamp
                  updatedAt:
                    type: string
                    format: date-time
                    description: Last update timestamp
                required:
                  - id
                  - agentId
                  - orgId
                  - fromDid
                  - toDid
                  - type
                  - status
                  - input
                  - output
                  - error
                  - history
                  - createdAt
                  - updatedAt
                description: Full A2A task representation
components:
  securitySchemes:
    BearerAuth:
      type: http
      scheme: bearer
      bearerFormat: JWT
      description: >-
        JWT Bearer token obtained from authentication. Pass as: Authorization:
        Bearer <token>
    ApiKeyAuth:
      type: apiKey
      in: header
      name: X-API-Key
      description: 'API key for programmatic access. Pass as: X-API-Key: <your-key>'

````