Linear Webhooks API

asyncapi: 2.6.0
info:
  title: Linear Webhooks API
  version: 2.0.0
  description: >-
    Linear webhooks deliver HTTP push notifications whenever data is created,
    updated, or removed. Webhooks are organization-scoped and can be configured
    for all public teams or a single team, enabling integrations that trigger
    CI builds, update external systems, or send messages based on issue activity.
  contact:
    name: Linear Support
    url: https://linear.app/contact/support
  license:
    name: Proprietary
    url: https://linear.app/terms
externalDocs:
  description: Linear Webhooks Documentation
  url: https://linear.app/developers/webhooks
servers:
  production:
    url: https://api.linear.app
    protocol: https
    description: Linear production server (webhook source)
defaultContentType: application/json
channels:
  issue/created:
    description: Fired when a new issue is created
    subscribe:
      operationId: onIssueCreated
      summary: Issue created
      description: >-
        Delivered when a new issue is created in a team. Contains the full issue
        object including title, state, assignee, priority, and team.
      tags:
        - name: Issues
      message:
        $ref: '#/components/messages/IssueCreated'
  issue/updated:
    description: Fired when an issue is updated
    subscribe:
      operationId: onIssueUpdated
      summary: Issue updated
      description: >-
        Delivered when any field of an issue changes including state transitions,
        assignee changes, priority updates, and label modifications.
      tags:
        - name: Issues
      message:
        $ref: '#/components/messages/IssueUpdated'
  issue/removed:
    description: Fired when an issue is deleted or trashed
    subscribe:
      operationId: onIssueRemoved
      summary: Issue removed
      description: Delivered when an issue is deleted or moved to trash.
      tags:
        - name: Issues
      message:
        $ref: '#/components/messages/IssueRemoved'
  comment/created:
    description: Fired when a comment is added to an issue
    subscribe:
      operationId: onCommentCreated
      summary: Comment created
      description: >-
        Delivered when a new comment is added to an issue or a reply is added
        to an existing comment.
      tags:
        - name: Comments
      message:
        $ref: '#/components/messages/CommentCreated'
  comment/updated:
    description: Fired when a comment is edited
    subscribe:
      operationId: onCommentUpdated
      summary: Comment updated
      description: Delivered when the body of a comment is edited by its author.
      tags:
        - name: Comments
      message:
        $ref: '#/components/messages/CommentUpdated'
  project/created:
    description: Fired when a project is created
    subscribe:
      operationId: onProjectCreated
      summary: Project created
      description: Delivered when a new project is created within the organization.
      tags:
        - name: Projects
      message:
        $ref: '#/components/messages/ProjectCreated'
  project/updated:
    description: Fired when a project is updated
    subscribe:
      operationId: onProjectUpdated
      summary: Project updated
      description: >-
        Delivered when project details, state, milestones, or member lists change.
      tags:
        - name: Projects
      message:
        $ref: '#/components/messages/ProjectUpdated'
  cycle/created:
    description: Fired when a cycle (sprint) is created
    subscribe:
      operationId: onCycleCreated
      summary: Cycle created
      description: Delivered when a new cycle is created in a team.
      tags:
        - name: Cycles
      message:
        $ref: '#/components/messages/CycleCreated'
  issueLabelCreated:
    description: Fired when an issue label is created
    subscribe:
      operationId: onIssueLabelCreated
      summary: Issue label created
      description: Delivered when a new label is created in a team.
      tags:
        - name: Labels
      message:
        $ref: '#/components/messages/IssueLabelCreated'
components:
  messages:
    IssueCreated:
      name: IssueCreated
      title: Issue Created Event
      summary: Payload for issue.create webhook events
      payload:
        $ref: '#/components/schemas/IssueWebhookPayload'
    IssueUpdated:
      name: IssueUpdated
      title: Issue Updated Event
      summary: Payload for issue.update webhook events
      payload:
        $ref: '#/components/schemas/IssueWebhookPayload'
    IssueRemoved:
      name: IssueRemoved
      title: Issue Removed Event
      summary: Payload for issue.remove webhook events
      payload:
        $ref: '#/components/schemas/IssueWebhookPayload'
    CommentCreated:
      name: CommentCreated
      title: Comment Created Event
      summary: Payload for comment.create webhook events
      payload:
        $ref: '#/components/schemas/CommentWebhookPayload'
    CommentUpdated:
      name: CommentUpdated
      title: Comment Updated Event
      summary: Payload for comment.update webhook events
      payload:
        $ref: '#/components/schemas/CommentWebhookPayload'
    ProjectCreated:
      name: ProjectCreated
      title: Project Created Event
      summary: Payload for project.create webhook events
      payload:
        $ref: '#/components/schemas/ProjectWebhookPayload'
    ProjectUpdated:
      name: ProjectUpdated
      title: Project Updated Event
      summary: Payload for project.update webhook events
      payload:
        $ref: '#/components/schemas/ProjectWebhookPayload'
    CycleCreated:
      name: CycleCreated
      title: Cycle Created Event
      summary: Payload for cycle.create webhook events
      payload:
        $ref: '#/components/schemas/CycleWebhookPayload'
    IssueLabelCreated:
      name: IssueLabelCreated
      title: Issue Label Created Event
      summary: Payload for issueLabel.create webhook events
      payload:
        $ref: '#/components/schemas/IssueLabelWebhookPayload'
  schemas:
    WebhookBase:
      type: object
      required:
        - action
      properties:
        action:
          type: string
          enum: [create, update, remove]
          description: The type of action that triggered the webhook
        organizationId:
          type: string
          description: ID of the organization that owns the webhook
        webhookTimestamp:
          type: integer
          description: Unix timestamp (ms) when the webhook was fired
        webhookId:
          type: string
          description: UUID of the webhook configuration
        type:
          type: string
          description: The entity type (e.g., Issue, Comment, Project)
    IssueWebhookPayload:
      allOf:
        - $ref: '#/components/schemas/WebhookBase'
        - type: object
          properties:
            type:
              type: string
              enum: [Issue]
            data:
              type: object
              description: The full issue object
              properties:
                id:
                  type: string
                identifier:
                  type: string
                title:
                  type: string
                description:
                  type: string
                priority:
                  type: integer
                  enum: [0, 1, 2, 3, 4]
                state:
                  type: object
                  properties:
                    id: { type: string }
                    name: { type: string }
                    type: { type: string }
                assignee:
                  type: object
                  properties:
                    id: { type: string }
                    name: { type: string }
                    email: { type: string }
                team:
                  type: object
                  properties:
                    id: { type: string }
                    name: { type: string }
                    key: { type: string }
                url:
                  type: string
                  format: uri
                createdAt:
                  type: string
                  format: date-time
                updatedAt:
                  type: string
                  format: date-time
            updatedFrom:
              type: object
              description: Previous values for updated fields (only on update events)
              additionalProperties: true
    CommentWebhookPayload:
      allOf:
        - $ref: '#/components/schemas/WebhookBase'
        - type: object
          properties:
            type:
              type: string
              enum: [Comment]
            data:
              type: object
              properties:
                id:
                  type: string
                body:
                  type: string
                user:
                  type: object
                  properties:
                    id: { type: string }
                    name: { type: string }
                issue:
                  type: object
                  properties:
                    id: { type: string }
                    identifier: { type: string }
                    title: { type: string }
                createdAt:
                  type: string
                  format: date-time
                updatedAt:
                  type: string
                  format: date-time
    ProjectWebhookPayload:
      allOf:
        - $ref: '#/components/schemas/WebhookBase'
        - type: object
          properties:
            type:
              type: string
              enum: [Project]
            data:
              type: object
              properties:
                id:
                  type: string
                name:
                  type: string
                description:
                  type: string
                state:
                  type: string
                  enum: [planned, started, paused, completed, cancelled]
                createdAt:
                  type: string
                  format: date-time
                updatedAt:
                  type: string
                  format: date-time
    CycleWebhookPayload:
      allOf:
        - $ref: '#/components/schemas/WebhookBase'
        - type: object
          properties:
            type:
              type: string
              enum: [Cycle]
            data:
              type: object
              properties:
                id:
                  type: string
                number:
                  type: integer
                name:
                  type: string
                startsAt:
                  type: string
                  format: date-time
                endsAt:
                  type: string
                  format: date-time
                teamId:
                  type: string
    IssueLabelWebhookPayload:
      allOf:
        - $ref: '#/components/schemas/WebhookBase'
        - type: object
          properties:
            type:
              type: string
              enum: [IssueLabel]
            data:
              type: object
              properties:
                id:
                  type: string
                name:
                  type: string
                color:
                  type: string
                teamId:
                  type: string