# Share Extension

> Share extension: share sheet integration, content validation, App Group data sharing between app and extension. Use when enabling share-from-other-apps functionality, receiving shared content, or sharing data via App Groups. Triggers: share extension, share sheet, NSExtensionContext, App Group, SLComposeServiceViewController.

- **Type:** Skill
- **Install:** `agentstack add skill-abdullah4ai-apple-developer-toolkit-share-extension`
- **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/share-extension

## Install

```sh
agentstack add skill-abdullah4ai-apple-developer-toolkit-share-extension
```

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

## About

# Share Extension

SHARE EXTENSION:
SETUP: Requires separate extension target (kind: "share" in plan extensions array).
The extension receives shared content (URLs, text, images) from other apps via the share sheet.

PRINCIPAL CLASS (in extension target):
class ShareViewController: SLComposeServiceViewController {
    override func isContentValid() -> Bool {
        return contentText.count > 0    // Validate before enabling Post button
    }

    override func didSelectPost() {
        // Access shared items
        guard let item = extensionContext?.inputItems.first as? NSExtensionItem,
              let provider = item.attachments?.first else {
            extensionContext?.completeRequest(returningItems: [], completionHandler: nil)
            return
        }

        if provider.hasItemConformingToTypeIdentifier("public.url") {
            provider.loadItem(forTypeIdentifier: "public.url") { [weak self] url, _ in
                // Handle URL
                self?.extensionContext?.completeRequest(returningItems: [], completionHandler: nil)
            }
        }
    }

    override func configurationItems() -> [Any]! {
        return []    // Return SLComposeSheetConfigurationItem array for optional UI
    }
}

INFO.PLIST KEYS (in extension's Info.plist via XcodeGen):
NSExtensionPrincipalClass: $(PRODUCT_MODULE_NAME).ShareViewController
NSExtensionActivationRule:
  NSExtensionActivationSupportsWebURLWithMaxCount: 1
  NSExtensionActivationSupportsText: true

APP GROUP: Use AppGroup entitlement to share data between main app and extension.

## 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-share-extension
- Seller: https://agentstack.voostack.com/s/abdullah4ai
- Browse the marketplace: https://agentstack.voostack.com/browse

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