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

# Trigger a signal

> Manually trigger a signal in a space. Returns JSON by default, or an SSE stream if `Accept: text/event-stream` is set.



## OpenAPI

````yaml /api-reference/openapi.json post /api/workspaces/{workspaceId}/signals/{signalId}
openapi: 3.1.0
info:
  title: Friday Platform API
  description: >-
    The Friday daemon HTTP API for managing spaces, agents, sessions, and
    automations.
  version: 1.0.0
servers:
  - url: http://localhost:18080
    description: Local Friday daemon
security: []
tags:
  - name: Health
    description: Daemon health and status
  - name: Spaces
    description: Space management
  - name: Chat
    description: Conversational AI
  - name: Sessions
    description: Execution session management
  - name: Signals
    description: Trigger management
  - name: Agents
    description: Agent discovery and inspection
  - name: Artifacts
    description: File and data artifact management
  - name: Configuration
    description: Daemon configuration
paths:
  /api/workspaces/{workspaceId}/signals/{signalId}:
    post:
      tags:
        - Signals
      summary: Trigger a signal
      description: >-
        Manually trigger a signal in a space. Returns JSON by default, or an SSE
        stream if `Accept: text/event-stream` is set.
      operationId: triggerSignal
      parameters:
        - name: workspaceId
          in: path
          required: true
          schema:
            type: string
        - name: signalId
          in: path
          required: true
          schema:
            type: string
      requestBody:
        content:
          application/json:
            schema:
              type: object
              properties:
                payload:
                  type: object
                  description: Optional payload to pass to the triggered job
      responses:
        '200':
          description: Signal triggered
          content:
            application/json:
              schema:
                type: object
                properties:
                  message:
                    type: string
                    example: Signal completed
                  status:
                    type: string
                    example: completed
                  workspaceId:
                    type: string
                  signalId:
                    type: string
                  sessionId:
                    type: string
      x-codeSamples:
        - lang: bash
          label: cURL
          source: >-
            curl -X POST
            http://localhost:18080/api/workspaces/abc123/signals/daily-trigger \
              -H 'Content-Type: application/json' \
              -d '{"payload": {"key": "value"}}'

````