Agent-ready instructions

Install the file-viewer skill

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---
name: file-viewer
description: Share or upload files to share.hisflat.com for public access
---

# File Viewer

Upload files to https://share.hisflat.com when a user needs a public link to an artifact. Links are non-guessable but public to anyone who has one, and expire 14 days after upload.

## Authentication

Read the API key from `FILE_VIEWER_API_KEY`. Never print, commit, or embed the key in output.

## Upload a file

Only HTML, Markdown, PNG, TXT, and CSV are accepted. Send the original bytes and include the filename:

```bash
curl --fail-with-body --silent --show-error \
  -X POST \
  -H "Authorization: Bearer $FILE_VIEWER_API_KEY" \
  -H "X-Filename: $(basename "$FILE")" \
  -H "Content-Type: application/octet-stream" \
  --data-binary "@$FILE" \
  https://share.hisflat.com/api/files
```

The JSON response contains `url`, `raw_url`, and `expires_at`. Return the `url` to the user.

You may instead send multipart form data with a field named `file`:

```bash
curl --fail-with-body --silent --show-error \
  -H "Authorization: Bearer $FILE_VIEWER_API_KEY" \
  -F "file=@$FILE" \
  https://share.hisflat.com/api/files
```

## Manage uploads

List files created by this key:

```bash
curl --fail-with-body --silent --show-error \
  -H "Authorization: Bearer $FILE_VIEWER_API_KEY" \
  https://share.hisflat.com/api/files
```

Extend a file to 14 days from now:

```bash
curl --fail-with-body --silent --show-error -X POST \
  -H "Authorization: Bearer $FILE_VIEWER_API_KEY" \
  https://share.hisflat.com/api/files/FILE_ID/extend
```

Delete a file immediately:

```bash
curl --fail-with-body --silent --show-error -X DELETE \
  -H "Authorization: Bearer $FILE_VIEWER_API_KEY" \
  https://share.hisflat.com/api/files/FILE_ID
```

## Safety

- Treat every returned URL as public. Do not upload secrets, credentials, or private personal data.
- Do not upload unsupported file types disguised with another extension.
- Tell the user the link expires after 14 days.
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