Configure Slack

Configure Slack Notifications

Set up Slack notifications so OMX can ping you when sessions end, need input, or complete background tasks.

How This Skill Works

This is an interactive, natural-language configuration skill. Walk the user through setup by asking questions with AskUserQuestion. Write the result to ~/.codex/.omx-config.json.

Step 1: Detect Existing Configuration

CONFIG_FILE="$HOME/.codex/.omx-config.json"

if [ -f "$CONFIG_FILE" ]; then
  HAS_SLACK=$(jq -r '.notifications.slack.enabled // false' "$CONFIG_FILE" 2>/dev/null)
  WEBHOOK_URL=$(jq -r '.notifications.slack.webhookUrl // empty' "$CONFIG_FILE" 2>/dev/null)
  CHANNEL=$(jq -r '.notifications.slack.channel // empty' "$CONFIG_FILE" 2>/dev/null)
  USERNAME=$(jq -r '.notifications.slack.username // empty' "$CONFIG_FILE" 2>/dev/null)
  MENTION=$(jq -r '.notifications.slack.mention // empty' "$CONFIG_FILE" 2>/dev/null)

  if [ "$HAS_SLACK" = "true" ]; then
    echo "EXISTING_CONFIG=true"
    [ -n "$WEBHOOK_URL" ] && echo "WEBHOOK_URL=$WEBHOOK_URL"
    [ -n "$CHANNEL" ] && echo "CHANNEL=$CHANNEL"
    [ -n "$USERNAME" ] && echo "USERNAME=$USERNAME"
    [ -n "$MENTION" ] && echo "MENTION=$MENTION"
  else
    echo "EXISTING_CONFIG=false"
  fi
else
  echo "NO_CONFIG_FILE"
fi

If existing config is found, show the user what's currently configured and ask if they want to update or reconfigure.

Step 2: Collect Webhook URL

Use AskUserQuestion:

Question: "Paste your Slack Incoming Webhook URL. To create one: Go to api.slack.com/apps > Your App > Incoming Webhooks > Add New Webhook to Workspace > Copy URL"

The user will type their webhook URL in the "Other" field.

Validate the URL:

• Must start with https://hooks.slack.com/services/ or https://hooks.slack.com/workflows/
• If invalid, explain the format and ask again

Step 3: Configure Channel (Optional)

Use AskUserQuestion:

Question: "Which Slack channel should receive notifications? (Optional — leave blank to use the webhook's default channel)"

Options:

1. Use webhook default - The channel configured in the Slack app integration
2. Specify a channel - Enter a channel name (e.g. #dev-alerts) or channel ID

Note: Overriding the channel requires the webhook to have permission for that channel.

Step 4: Configure Mention (Optional)

Use AskUserQuestion:

Question: "Would you like notifications to mention (ping) someone?"

Options:

1. Yes, mention a user - Tag a user with <@UXXXXXXXX>
2. Yes, mention a channel - Tag everyone with <!channel> or <!here>
3. No mentions - Just post the message without pinging anyone

If user wants to mention a user:

Ask: "What is the Slack member ID to mention? (Click the user's profile > More > Copy member ID)"

Format: <@UXXXXXXXX> (e.g. <@U012AB3CD>)

If user wants a channel mention:

Choose between:

• <!channel> — notifies all channel members regardless of online status
• <!here> — notifies only currently active channel members

Step 5: Configure Display Name (Optional)

Use AskUserQuestion:

Question: "Custom bot display name in Slack? (Shows as the message sender)"

Options:

1. OMX (default) - Display as "OMX"
2. Codex CLI - Display as "Codex CLI"
3. Custom - Enter a custom name

Step 6: Configure Events

Use AskUserQuestion with multiSelect:

Question: "Which events should trigger Slack notifications?"

Options (multiSelect: true):

1. Session end (Recommended) - When a Codex session finishes
2. Input needed - When Codex is waiting for your response (great for long-running tasks)
3. Session start - When a new session begins
4. Session continuing - When a persistent mode keeps the session alive

Default selection: session-end + ask-user-question.

Step 7: Write Configuration

Read the existing config, merge the new Slack settings, and write back:

CONFIG_FILE="$HOME/.codex/.omx-config.json"
mkdir -p "$(dirname "$CONFIG_FILE")"

if [ -f "$CONFIG_FILE" ]; then
  EXISTING=$(cat "$CONFIG_FILE")
else
  EXISTING='{}'
fi

# WEBHOOK_URL, CHANNEL, MENTION, USERNAME are collected from user
echo "$EXISTING" | jq \
  --arg url "$WEBHOOK_URL" \
  --arg channel "$CHANNEL" \
  --arg mention "$MENTION" \
  --arg username "$USERNAME" \
  '.notifications = (.notifications // {enabled: true}) |
   .notifications.enabled = true |
   .notifications.slack = {
     enabled: true,
     webhookUrl: $url,
     channel: (if $channel == "" then null else $channel end),
     mention: (if $mention == "" then null else $mention end),
     username: (if $username == "" then null else $username end)
   }' > "$CONFIG_FILE"

Add event-specific config if user didn't select all events:

For each event NOT selected, disable it:

# Example: disable session-start if not selected
echo "$(cat "$CONFIG_FILE")" | jq \
  '.notifications.events = (.notifications.events // {}) |
   .notifications.events["session-start"] = {enabled: false}' > "$CONFIG_FILE"

Step 8: Test the Configuration

After writing config, offer to send a test notification:

Use AskUserQuestion:

Question: "Send a test notification to verify the setup?"

Options:

1. Yes, test now (Recommended) - Send a test message to your Slack channel
2. No, I'll test later - Skip testing

If testing:

RESPONSE=$(curl -s -o /dev/null -w "%{http_code}" \
  -H "Content-Type: application/json" \
  -d "{\"text\": \"${MENTION:+$MENTION\\n}OMX test notification - Slack is configured!\", \"username\": \"${USERNAME:-OMX}\"}" \
  "$WEBHOOK_URL")

if [ "$RESPONSE" = "200" ]; then
  echo "Test notification sent successfully!"
else
  echo "Failed (HTTP $RESPONSE). Check the webhook URL and channel permissions."
fi

Report success or failure. Common issues:

• 400 Bad Request: Malformed JSON or invalid channel override
• 403 Forbidden: Channel override not permitted by the webhook
• 404 Not Found: Webhook URL is invalid or revoked — regenerate it in Slack

Step 9: Confirm

Display the final configuration summary:

Slack Notifications Configured!

  Webhook:  https://hooks.slack.com/services/...
  Channel:  #dev-alerts (or "webhook default")
  Mention:  <!channel> (or "none")
  Username: OMX
  Events:   session-end, ask-user-question

Config saved to: ~/.codex/.omx-config.json

You can also set these via environment variables:
  OMX_SLACK_WEBHOOK_URL=https://hooks.slack.com/services/...
  OMX_SLACK_MENTION=<!channel>

To reconfigure: /configure-slack
To configure Discord: /configure-discord
To configure Telegram: /configure-telegram

Environment Variable Alternative

Users can skip this wizard entirely by setting env vars in their shell profile:

export OMX_SLACK_WEBHOOK_URL="https://hooks.slack.com/services/..."
export OMX_SLACK_MENTION="<!channel>"  # optional

Env vars are auto-detected by the notification system without needing .omx-config.json.