Slack Post a Message, React, and Pin It

arazzo: 1.0.1
info:
  title: Slack Post a Message, React, and Pin It
  summary: Post a message to a channel, add a reaction emoji, and pin it.
  description: >-
    A highlight pattern that posts an important message and immediately makes it
    stand out. The workflow posts the message to a channel, adds a reaction
    emoji to it using the returned timestamp, and pins the message so it stays
    accessible at the top of the channel. Every step spells out its request
    inline so the flow can be read and executed without opening the underlying
    OpenAPI description.
  version: 1.0.0
sourceDescriptions:
- name: chatApi
  url: ../openapi/_original/slack-chat-openapi.yml
  type: openapi
- name: reactionsApi
  url: ../openapi/_original/slack-reactions-openapi.yml
  type: openapi
- name: pinsApi
  url: ../openapi/_original/slack-pins-openapi.yml
  type: openapi
workflows:
- workflowId: post-react-pin
  summary: Post a message, react to it, and pin it to the channel.
  description: >-
    Posts a message to a channel, adds a reaction emoji to the new message, and
    pins the message so it stays visible.
  inputs:
    type: object
    required:
    - channel
    - text
    - reaction
    properties:
      channel:
        type: string
        description: The channel ID to post the message into.
      text:
        type: string
        description: The message text to post.
      reaction:
        type: string
        description: The reaction (emoji) name to add, without colons.
  steps:
  - stepId: postMessage
    description: >-
      Post the message to the target channel and capture its timestamp for the
      follow on reaction and pin steps.
    operationId: postChatPostmessage
    requestBody:
      contentType: application/x-www-form-urlencoded
      payload:
        channel: $inputs.channel
        text: $inputs.text
    successCriteria:
    - condition: $statusCode == 200
    - context: $response.body
      condition: $.ok == true
      type: jsonpath
    outputs:
      channelId: $response.body#/channel
      messageTs: $response.body#/ts
  - stepId: addReaction
    description: >-
      Add the supplied reaction emoji to the newly posted message.
    operationId: postReactionsAdd
    requestBody:
      contentType: application/x-www-form-urlencoded
      payload:
        channel: $steps.postMessage.outputs.channelId
        name: $inputs.reaction
        timestamp: $steps.postMessage.outputs.messageTs
    successCriteria:
    - condition: $statusCode == 200
    - context: $response.body
      condition: $.ok == true
      type: jsonpath
    outputs:
      reacted: $response.body#/ok
  - stepId: pinMessage
    description: >-
      Pin the newly posted message to the channel so it stays accessible.
    operationId: postPinsAdd
    requestBody:
      contentType: application/x-www-form-urlencoded
      payload:
        channel: $steps.postMessage.outputs.channelId
        timestamp: $steps.postMessage.outputs.messageTs
    successCriteria:
    - condition: $statusCode == 200
    - context: $response.body
      condition: $.ok == true
      type: jsonpath
    outputs:
      pinned: $response.body#/ok
  outputs:
    channelId: $steps.postMessage.outputs.channelId
    messageTs: $steps.postMessage.outputs.messageTs