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Send notifications to external services like Slack to integrate App Store Connect CLI into your CI/CD workflows.

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Quick Start

export ASC_SLACK_WEBHOOK="https://hooks.slack.com/services/..."
asc notify slack --message "Build uploaded"
asc notify slack --message "Release ready" --channel "#deployments"

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Subcommands

  • slack - Send a message to Slack via webhook

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Commands

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notify slack

Send a message to Slack via incoming webhook: 
asc notify slack --webhook "https://hooks.slack.com/..." --message "Build uploaded"
asc notify slack --message "Done" --channel "#deployments"
ASC_SLACK_WEBHOOK=$WEBHOOK asc notify slack --message "Release v2.1 ready"
Flags:
  • --webhook - Slack webhook URL (or set ASC_SLACK_WEBHOOK env var)
  • --channel - Slack channel override (#channel or @username)
  • --message - Message to send to Slack (required)
  • --thread-ts - Parent message timestamp (thread_ts) for posting a threaded reply
  • --blocks-json - Slack Block Kit JSON array
  • --blocks-file - Path to Slack Block Kit JSON array file
  • --payload-json - JSON object of release fields to include as Slack attachment fields
  • --payload-file - Path to JSON object file for release payload fields
  • --pretext - Optional text shown above attachment payload fields (requires --payload-json/--payload-file)
  • --success - Set attachment color to success (true) or failure (false, default: true)

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Basic Usage

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Simple Message

asc notify slack \
  --webhook "https://hooks.slack.com/services/..." \
  --message "Build uploaded successfully"

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Channel Override

asc notify slack \
  --message "Deployment complete" \
  --channel "#deployments"
Note: Slack may ignore channel overrides for incoming webhooks based on app settings.

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Environment Variable

Set the webhook URL via environment variable: 
export ASC_SLACK_WEBHOOK="https://hooks.slack.com/services/..."
asc notify slack --message "Build complete"

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Advanced Features

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Threaded Replies

Post a message as a reply to an existing thread: 
asc notify slack \
  --message "Build update" \
  --thread-ts "1733977745.12345"
Note: The thread-ts value must be in Slack timestamp format (e.g., 1733977745.12345). Webhook POST returns only “ok”, so you need to obtain the parent message ts from Slack APIs/events.

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Block Kit Messages

Use Slack Block Kit for rich message formatting: 
asc notify slack \
  --message "Release ready" \
  --blocks-json '[{"type":"section","text":{"type":"mrkdwn","text":"*Release* ready"}}]'
Or load from a file: 
asc notify slack \
  --message "Release ready" \
  --blocks-file ./blocks.json
blocks.json: 
[
  {
    "type": "section",
    "text": {
      "type": "mrkdwn",
      "text": "*Release v2.1.0* ready for deployment"
    }
  },
  {
    "type": "section",
    "fields": [
      {
        "type": "mrkdwn",
        "text": "*App:*\nMyApp"
      },
      {
        "type": "mrkdwn",
        "text": "*Version:*\n2.1.0"
      }
    ]
  }
]

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Attachment Payloads

Include structured data as attachment fields: 
asc notify slack \
  --message "Release submitted" \
  --payload-json '{"app":"MyApp","version":"1.2.3","build":"42"}'
With pretext and color: 
asc notify slack \
  --message "Release submitted" \
  --pretext "New release ready" \
  --payload-json '{"app":"MyApp","version":"1.2.3","build":"42"}' \
  --success true
Or load from a file: 
asc notify slack \
  --message "Release submitted" \
  --payload-file ./release.json
release.json: 
{
  "app": "MyApp",
  "version": "1.2.3",
  "build": "42",
  "platform": "iOS",
  "submitted": "2026-03-04T12:34:56Z"
}

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CI/CD Integration

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GitHub Actions

name: Notify Slack
on:
  workflow_dispatch:

jobs:
  notify:
    runs-on: ubuntu-latest
    steps:
      - name: Notify Slack
        env:
          ASC_SLACK_WEBHOOK: ${{ secrets.SLACK_WEBHOOK }}
        run: |
          asc notify slack --message "Build uploaded for MyApp v1.2.3"

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GitLab CI

notify:
  stage: notify
  script:
    - asc notify slack --message "Pipeline complete for $CI_COMMIT_REF_NAME"
  variables:
    ASC_SLACK_WEBHOOK: $SLACK_WEBHOOK

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Fastlane Integration

lane :notify_slack do |options|
  message = options[:message] || "Build complete"
  sh(
    "asc",
    "notify",
    "slack",
    "--message",
    message
  )
end

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Examples

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Build Upload Notification

#!/bin/bash
set -e

# Upload build
asc builds upload --ipa ./MyApp.ipa

# Notify Slack
asc notify slack \
  --message "New build uploaded for MyApp" \
  --payload-json '{"version":"1.2.3","build":"42"}'

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TestFlight Distribution

#!/bin/bash
set -e

BUILD_ID="12345"
GROUP_ID="67890"

# Add build to TestFlight group
asc builds add-groups --build "$BUILD_ID" --group "$GROUP_ID"

# Notify Slack
asc notify slack \
  --message "Build distributed to TestFlight" \
  --channel "#qa" \
  --payload-json '{"build":"'$BUILD_ID'","group":"Internal Testers"}'

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Submission Status

#!/bin/bash
set -e

VERSION="1.2.3"
BUILD_ID="12345"

# Submit for review
asc submit create \
  --app "$APP_ID" \
  --version "$VERSION" \
  --build "$BUILD_ID" \
  --confirm

# Notify Slack with success
asc notify slack \
  --message "Version $VERSION submitted for review" \
  --pretext "App Store submission" \
  --payload-json '{"app":"MyApp","version":"'$VERSION'","build":"'$BUILD_ID'"}' \
  --success true

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Error Notification

#!/bin/bash

# Run command and capture error
if ! asc builds upload --ipa ./MyApp.ipa 2>&1; then
  # Notify Slack on failure
  asc notify slack \
    --message "Build upload failed" \
    --pretext "CI/CD Error" \
    --payload-json '{"job":"upload","status":"failed"}' \
    --success false
  exit 1
fi

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Security

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Webhook URL Security

  • Only https://hooks.slack.com and https://hooks.slack-gov.com are allowed by default
  • IP addresses are rejected
  • The webhook URL must start with /services/
  • For local testing, set ASC_SLACK_WEBHOOK_ALLOW_LOCALHOST=1 to allow http://localhost

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Environment Variables

Store sensitive webhook URLs in environment variables or CI/CD secrets: 
# Don't commit webhook URLs to version control
export ASC_SLACK_WEBHOOK="https://hooks.slack.com/services/..."

# Use in CI/CD
asc notify slack --message "Build complete"

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Troubleshooting

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Channel Override Not Working

Slack may ignore channel overrides for incoming webhooks based on app configuration. Configure the default channel in your Slack app settings.

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Webhook Returns Error

Check that:
  • The webhook URL is valid and active
  • The URL starts with https://hooks.slack.com/services/ or https://hooks.slack-gov.com/services/
  • The message is not empty
  • JSON payloads are valid

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Message Not Appearing

Verify:
  • The webhook URL is correct
  • The Slack app has permission to post to the channel
  • The message format is valid
  • Block Kit JSON is properly formatted