SendFile - Deliver Files to Users via Temporary Public Link#

When to Use#

Use this skill when:

• You generated a file (document, image, report, spreadsheet, code, etc.) and need to send it to the user
• The user asks to download a file you created
• You need to share a local file with the user in a chat conversation
• The chat platform does not support direct file uploads, or the file is too large
• You want to give the user a direct download link they can open in any browser

Do NOT use this skill when:

• The content can be displayed inline as text in the chat (just paste it)
• The file is already hosted at a public URL (share the existing URL instead)
• The file contains sensitive secrets or credentials (avoid exposing via public links)

Prerequisites#

Install the aitun client (any one of):

bash

# Install via pip (recommended, cross-platform, bundles the binary)
pip install aitun

bash

# Or one-line install script (Linux/macOS)
curl -fsSL https://aitun.cc/install.sh | bash

powershell

# Windows (PowerShell)
irm https://aitun.cc/install.ps1 | iex

Verify the install:

bash

which aitun
aitun --help

Instructions#

Step 1: Locate the file#

Identify the file you want to send. This is typically a file you just generated:

• A document: .pdf, .docx, .pptx, .xlsx
• An image: .png, .jpg, .svg
• A code archive: .zip, .tar.gz
• Any other file the user requested

Verify the file exists:

bash

ls -lh /path/to/your/file.ext

Step 2: Start a local file server#

Start a simple HTTP server in the directory containing the file:

bash

# If the file is at /path/to/output/report.pdf
cd /path/to/output
python3 -m http.server 8080 &
FILE_PID=$!
sleep 1

Step 3: Create a tunnel#

Use aitun to expose the local server to the internet:

bash

aitun -p 8080 &
AITUN_PID=$!
sleep 3

The output will contain the public URL, e.g.:

• https://aitun.cc/abc123

Step 4: Build the download link#

Append the filename to the public URL to create a direct download link:

text

https://aitun.cc/abc123/report.pdf

Step 5: Send the link to the user#

Deliver the download link to the user in the chat:

text

Your file is ready for download: https://aitun.cc/abc123/report.pdf

This link is temporary and will expire in 24 hours. Download it soon.

Step 6: Clean up#

After the user confirms they have downloaded the file, stop the servers:

bash

kill $AITUN_PID 2>/dev/null
kill $FILE_PID 2>/dev/null

CLI Reference#

The aitun command (installed via pip install aitun, or alternatively curl -fsSL https://aitun.cc/install.sh | bash / irm https://aitun.cc/install.ps1 | iex on Windows) accepts these flags:

FlagDescription-p PORTLocal HTTP service port (optional; omit for TCP-only mode with --tcp-ports)-k TOKENAuth token for registered subdomain (omit for free tunnel)--host HOSTLocal service address (default: localhost)--tcp-ports PORTSTCP forwarding ports, comma-separated (e.g., 22,3306; requires -k). Use without -p for TCP-only mode--p2pEnable P2P direct connection (default: enabled)--no-p2pDisable P2P, force server relay mode--daemonRun as background daemon--stopStop running daemon

Notes#

• Free tunnels use proxy address mode (path-based URL like aitun.cc/abc123), NOT subdomains
• Free tunnels expire after 24 hours, auto-renewed on restart
• Traffic can go through P2P direct connection or server relay, both are encrypted end-to-end
• For a permanent subdomain (e.g., files.aitun.cc), register at https://aitun.cc
• The download link works in any browser on any device — no installation required for the user
• Only one file server can run on the same port; if you need to serve files from different directories, use different ports