Tool.Add Notification Channel.E85166861d03e25f

Use this skill when the OpenART registry selects tool.add_notification_channel.e85166861d03e25f for the current task.

Overview

Notification channels in FetchTheChange follow a strict pattern: a delivery service file, an encrypted credential store, a channel type in the Zod enum, a case in the delivery switch in server/services/notification.ts, and per-monitor UI. The existing Slack and webhook implementations are the reference. This skill encodes the security constraints (encrypted tokens, no plaintext logging) and architectural rules (dedicated service file, tier gating, CSRF exemption for OAuth callbacks).

Workflow

1. Read server/services/notification.ts — understand deliverToChannels() switch and ChannelDeliveryResult.
2. Read server/services/slackDelivery.ts — reference for delivery service interface.
3. Read server/services/webhookDelivery.ts — reference for delivery service interface.
4. Read server/utils/encryption.ts — understand encryptToken() and decryptToken().
5. Read shared/schema.ts — note notificationChannels table and slackConnections table patterns.
6. Read shared/routes.ts — note channelTypeSchema Zod enum and channel-related route definitions.
7. Add the new channel type string to channelTypeSchema in shared/routes.ts (e.g. z.enum(["email", "webhook", "slack", "discord"])).
8. If the channel requires stored credentials (OAuth tokens, bot tokens, API keys), add a new table to shared/schema.ts following the slackConnections pattern with an encrypted token column.
9. Create a delivery service at server/services/{channel}Delivery.ts following slackDelivery.ts:
   • Export a deliver() function accepting (monitor, change, channelConfig, token).
   • Return { success: boolean; error?: string }.
10. Wire the new channel into the switch (ch.channel) block in deliverToChannels() and deliverDigestToChannels() in server/services/notification.ts:
    • Decrypt stored token with decryptToken().
    • Call the new delivery service.
    • Log delivery results via storage.addDeliveryLog().
11. If OAuth is required, register install and callback routes in server/routes.ts:
    • Store tokens using encryptToken() — never plaintext.
    • Add the OAuth callback path to EXEMPT_PATHS or EXEMPT_PREFIXES in server/middleware/csrf.ts.
12. Add a tier gate: new channels must enforce the same Pro/Power check pattern used by Slack and webhook routes — read from TIER_LIMITS in shared/models/auth.ts.
13. Add storage methods to IStorage and DatabaseStorage in server/storage.ts for credential CRUD.
14. Add per-monitor channel selection UI in the monitor notification settings, using shadcn/ui primitives.
15. Run npm run check && npm run test.

Hard constraints

• NEVER store a bot token, OAuth token, or API key in plaintext — always encrypt with encryptToken() from server/utils/encryption.ts
• NEVER log a decrypted token — even at debug level; log only safe prefixes or redacted placeholders
• NEVER return a stored credential in a GET response — return a redacted placeholder only (e.g. "••••connected")
• NEVER add a new channel type string without adding it to channelTypeSchema in shared/routes.ts — validation will reject the value
• NEVER wire delivery logic inline in a route handler — create a dedicated service file following slackDelivery.ts / webhookDelivery.ts
• NEVER add an OAuth callback route without a CSRF exemption in server/middleware/csrf.ts — the callback carries no Origin header
• NEVER skip the tier gate — new channels must enforce the same Pro/Power check pattern used by existing Slack and webhook routes, reading from TIER_LIMITS
• NEVER skip the verification gate — run npm run check && npm run test before committing