webdav-mcp

A zero-dependency WebDAV MCP server — single static binary, no Node.js or Python required.

Implements the Model Context Protocol (MCP) over JSON-RPC 2.0 via stdio, exposing 8 WebDAV operations as tools that any MCP-compatible AI agent can call.

Why this exists

Every other WebDAV MCP server on GitHub requires a Node.js or Python runtime. This one is a single self-contained binary (~100–160 KB) compiled from Zig. It runs anywhere without installing a runtime, and it cross-compiles to all major platforms from one machine.

Tools

Tool parameters

list

• path (required) — directory path relative to WebDAV root

• recursive (boolean, default false) — if true, lists recursively using Depth: infinity. Note: some servers (IIS, some nginx configs) block recursive listing.

read

• path (required) — file path relative to WebDAV root

• max_bytes (integer, default 1048576) — maximum file size to read in bytes. Returns an error if the file is larger. Increase this for large files.

write

• path (required) — file path relative to WebDAV root

• content (required) — content to write

• content_type (string, default application/octet-stream) — MIME type for the file (e.g. text/plain, application/json)

• create_parents (boolean, default false) — if true and the parent directory does not exist, automatically creates all missing ancestor directories via MKCOL before writing

stat

• path (required) — path to stat relative to WebDAV root

• Returns: file or dir or missing, plus size=, modified=, etag=, and type= when available

Configuration

Set these environment variables before launching the server:

Credential security

Credentials are sent via native Zig HTTP networking using the Authorization: Basic ... header. No external curl process is spawned.

Building from source

Requires Zig 0.16.0.

# Development build
zig build

# Optimized release build (~100-160 KB)
zig build -Doptimize=ReleaseSmall

# Cross-compile for all platforms (outputs to zig-out/release/)
zig build cross

Cross-compilation targets

Integration with nullclaw / *Claw bots

Add an mcp_servers entry to your bot's config.json:

{
  "mcp_servers": {
    "webdav": {
      "command": "/path/to/webdav-mcp",
      "args": [],
      "env": {
        "WEBDAV_URL": "http://your-webdav-server:8080",
        "WEBDAV_USER": "your-username",
        "WEBDAV_PASS": "your-password"
      }
    }
  }
}

The server speaks JSON-RPC 2.0 over stdio (newline-delimited), which is the standard MCP transport. Once registered, the agent can call all 8 tools as normal tool calls.

Running tests

zig build test --summary all

All unit tests cover XML parsing, JSON-RPC dispatch, argument extraction, URL construction, percent-encoding, entity decoding, and HTTP method routing.

License

MIT — see LICENSE.