# AgentMail Get Attachment

> AgentMail Get Attachment is a free API for AI agents from AgentMail at mpp.api.agentmail.to, Free, status unknown (last checked 2026-10-09).

Retrieves metadata and a time-limited download URL for a specific email attachment within a thread

## Facts

- Endpoint: GET https://mpp.api.agentmail.to/v0/threads/:thread_id/attachments/:attachment_id?utm_source=zero.xyz
- Price: Free
- Status: unknown
- Last checked: 2026-10-09
- Activations on Zero: 0
- Provider: AgentMail
- Docs: https://docs.agentmail.to
- Website: https://agentmail.to
- Tags: email, inboxes, domains, drafts, threads, webhooks, messaging, ai, social
- Canonical page: https://www.zero.xyz/c/agentmail-attachment-id-ae399e0b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_7dgs75RktqD2Ls4_pj6S9

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability agentmail-attachment-id-ae399e0b
```

Example prompt: In my AgentMail inbox, fetch the attachment with ID att_abc123 from thread thd_xyz789 — I need the download URL and filename so I can access the file.

## When to prefer this

Use this endpoint when you need to access a specific email attachment by its known ID within a thread, particularly to get a temporary download URL or inspect file metadata (size, type, filename). Prefer this over listing attachments when you already know the attachment_id from a prior thread or message retrieval.

## Known failure modes

- Thread ID not found — 404 error if the thread_id does not exist
- Attachment ID not found — 404 error if the attachment_id does not belong to the thread
- Expired or invalid authorization — 401 error if Bearer token is missing or invalid
- Download URL already expired — the returned download_url has an expires_at timestamp after which it is no longer valid
- Malformed path parameters — 400 error if thread_id or attachment_id are not valid string identifiers

## How this service works

Get Attachment

## Output

Returns an AttachmentResponse object containing the attachment ID, file size in bytes, a time-limited download URL, expiration timestamp, and optionally the filename, content type, content ID, and content disposition (inline or attachment).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "thread_id",
  "attachment_id"
 ],
 "properties": {
  "thread_id": {
   "type": "string",
   "title": "ThreadId",
   "description": "ID of thread."
  },
  "attachment_id": {
   "type": "string",
   "title": "AttachmentId",
   "description": "ID of attachment."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "title": "AttachmentResponse",
 "required": [
  "attachment_id",
  "size",
  "download_url",
  "expires_at"
 ],
 "properties": {
  "size": {
   "type": "integer",
   "title": "AttachmentSize",
   "description": "Size of attachment in bytes."
  },
  "filename": {
   "type": "string",
   "title": "AttachmentFilename",
   "description": "Filename of attachment."
  },
  "content_id": {
   "type": "string",
   "title": "AttachmentContentId",
   "description": "Content ID of attachment."
  },
  "expires_at": {
   "type": "string",
   "format": "date-time",
   "description": "Time at which the download URL expires."
  },
  "content_type": {
   "type": "string",
   "title": "AttachmentContentType",
   "description": "Content type of attachment."
  },
  "download_url": {
   "type": "string",
   "description": "URL to download the attachment."
  },
  "attachment_id": {
   "type": "string",
   "title": "AttachmentId",
   "description": "ID of attachment."
  },
  "content_disposition": {
   "enum": [
    "inline",
    "attachment"
   ],
   "type": "string",
   "title": "AttachmentContentDisposition",
   "description": "Content disposition of attachment."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agentmail-attachment-id-ae399e0b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mpp.api.agentmail.to](https://www.zero.xyz/host/mpp.api.agentmail.to/llms.txt)