---
name: handling-attachments
description: File attachment handling for XMTP agents. Use when sending or receiving images, files, or any encrypted remote attachments. Triggers on file upload, image sending, or remote attachment handling.
license: MIT
metadata:
  author: xmtp
  version: "1.0.0"
---

# XMTP attachments

Handle file attachments using encrypted remote attachments. Files are encrypted locally, uploaded to your storage provider, and sent as a remote attachment message.

## When to apply

Reference these guidelines when:
- Sending files or images from an agent
- Receiving and downloading attachments
- Implementing custom upload storage
- Working with encrypted file transfers

## Rule categories by priority

| Priority | Category | Impact | Prefix |
|----------|----------|--------|--------|
| 1 | Send | CRITICAL | `send-` |
| 2 | Receive | CRITICAL | `receive-` |
| 3 | Upload | HIGH | `upload-` |

## Quick reference

### Send (CRITICAL)
- `send-remote-attachment` - Send encrypted file attachments

### Receive (CRITICAL)
- `receive-attachment` - Download and decrypt attachments

### Upload (HIGH)
- `upload-callback` - Implement custom upload storage (Pinata, S3, etc.)

## Quick start

```typescript
import { type AttachmentUploadCallback } from "@xmtp/agent-sdk/util";

// Send an attachment
const file = new File(["Hello, World!"], "hello.txt", { type: "text/plain" });
await ctx.conversation.sendRemoteAttachment(file, uploadCallback);

// Receive an attachment
agent.on("attachment", async (ctx) => {
  const attachment = await downloadRemoteAttachment(ctx.message.content, agent);
  console.log(`Received: ${attachment.filename}`);
});
```

## How to use

Read individual rule files for detailed explanations:

```
rules/send-remote-attachment.md
rules/receive-attachment.md
rules/upload-callback.md
```



---
Source attribution: jiayaoqijia
Original project: https://github.com/jiayaoqijia/cryptoskill/blob/main/skills/social/xmtp-agent/handling-attachments/SKILL.md
License: MIT
License information: https://opensource.org/license/mit
Original upstream instructions; downloaded from Mega AI Hub.

## Upstream license notice

MIT License

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.



# Mega AI Hub resource metadata

Creator / publisher: jiayaoqijia
Original project: https://github.com/jiayaoqijia/cryptoskill/blob/main/skills/social/xmtp-agent/handling-attachments/SKILL.md
Attribution basis: Source repository record

Fields of work: Sales, Customer Support
Roles: Customer Success Manager, Support Agent, Technical Support
Specialties: API
Tools: Xmtp
Country applicability: Country not specified
Classification basis: Source catalog labels
Instruction SHA-256: 91d1fca5863898e35c21aba09023e5fd562e7d73e679d2c9eda82acb316e2902