# Notification Service

> Notification service extension: rich push notification modification, media attachment downloads, content transformation before display. Use when customizing push notification content, downloading images for notifications, or modifying notification payloads. Triggers: UNNotificationServiceExtension, rich notification, push attachment, notification content.

- **Type:** Skill
- **Install:** `agentstack add skill-abdullah4ai-apple-developer-toolkit-notification-service`
- **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior
- **Seller:** [Abdullah4AI](https://agentstack.voostack.com/s/abdullah4ai)
- **Installs:** 0
- **Category:** [Agent Skills](https://agentstack.voostack.com/c/agent-skills)
- **Latest version:** 0.1.0
- **License:** MIT
- **Upstream author:** [Abdullah4AI](https://github.com/Abdullah4AI)
- **Source:** https://github.com/Abdullah4AI/apple-developer-toolkit/tree/main/swiftship/internal/skills/data/extensions/notification-service

## Install

```sh
agentstack add skill-abdullah4ai-apple-developer-toolkit-notification-service
```

Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent.

## About

# Notification Service

NOTIFICATION SERVICE EXTENSION:
SETUP: Requires separate extension target (kind: "notification_service" in plan extensions array).
Used to modify rich push notification content before display (add images, decrypt payload, etc.).

PRINCIPAL CLASS (in extension):
class NotificationService: UNNotificationServiceExtension {
    var contentHandler: ((UNNotificationContent) -> Void)?
    var bestAttemptContent: UNMutableNotificationContent?

    override func didReceive(_ request: UNNotificationRequest,
                             withContentHandler contentHandler: @escaping (UNNotificationContent) -> Void) {
        self.contentHandler = contentHandler
        bestAttemptContent = (request.content.mutableCopy() as? UNMutableNotificationContent)

        guard let bestAttemptContent else { contentHandler(request.content); return }

        // Modify content here — e.g., download and attach image
        if let urlString = request.content.userInfo["image_url"] as? String,
           let url = URL(string: urlString) {
            downloadAndAttach(url: url, to: bestAttemptContent) { modified in
                contentHandler(modified)
            }
        } else {
            bestAttemptContent.title = "[Modified] " + bestAttemptContent.title
            contentHandler(bestAttemptContent)
        }
    }

    override func serviceExtensionTimeWillExpire() {
        // Called just before extension is killed — deliver best attempt
        if let contentHandler, let bestAttemptContent {
            contentHandler(bestAttemptContent)
        }
    }
}

ADDING ATTACHMENT:
func downloadAndAttach(url: URL, to content: UNMutableNotificationContent, completion: @escaping (UNNotificationContent) -> Void) {
    URLSession.shared.downloadTask(with: url) { localURL, _, _ in
        if let localURL, let attachment = try? UNNotificationAttachment(identifier: "image", url: localURL) {
            content.attachments = [attachment]
        }
        completion(content)
    }.resume()
}

## Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

- **Author:** [Abdullah4AI](https://github.com/Abdullah4AI)
- **Source:** [Abdullah4AI/apple-developer-toolkit](https://github.com/Abdullah4AI/apple-developer-toolkit)
- **License:** MIT

Install and usage instructions live in the source repository linked above.

## Pricing

- **Free** — Free

## Security capabilities

Automated source analysis of v0.1.0 — what this tool can access:

- **Network access:** no
- **Filesystem access:** no
- **Shell / process execution:** no
- **Environment & secrets:** no
- **Dynamic code execution:** no

*"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.*


## Versions

- **0.1.0** — security scan: passed — Imported from the upstream source.

## Links

- Listing page: https://agentstack.voostack.com/l/skill-abdullah4ai-apple-developer-toolkit-notification-service
- Seller: https://agentstack.voostack.com/s/abdullah4ai
- Browse the marketplace: https://agentstack.voostack.com/browse

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Listed on AgentStack — the marketplace for AI agent skills and MCP servers. Every listing is security-reviewed. Creators keep 70%.