OpenClaw.NET Skills SDK

OpenClaw-focused C# Skills SDK that exposes [ClawTool] methods over MCP (JSON-RPC 2.0) via stdio.

Goals

• Zero external runtime dependencies (uses System.Text.Json only)
• NativeAOT-friendly design
• Minimal, OpenClaw-first MCP server over stdio

Quick Start

Build the solution:

dotnet build -c Release

Run the host:

dotnet run -c Release --project src/OpenClaw.Net.Host

Define a Tool

Create a public static method and annotate it:

using OpenClaw.Net.Skills.Reflection;

public static class MySkills
{
    [ClawTool("Echo back the provided message.")]
    public static string Echo(string message) => message;
}

Stdio MCP Test

Pipe a JSON-RPC request into the host:

echo { "jsonrpc":"2.0", "id":1, "method":"list_tools" } | dotnet run -c Release --project src/OpenClaw.Net.Host

Registration Helper

Print a snippet for ~/.openclaw/openclaw.json:

dotnet run -c Release --project src/OpenClaw.Net.Host -- --register

This outputs a JSON block like:

{ "mcpServers": { "openclaw-net": { "command": "path-to-exe", "args": [] } } }

Assumption: the OpenClaw config shape includes mcpServers with a command and args. Adjust as needed for your OpenClaw version.

Tests

dotnet test -c Release --no-build

License

Licensed under the Apache License 2.0 with the Commons Clause. See LICENSE for details. You may use this code freely; the Commons Clause restricts selling a product or service whose value derives substantially from this software.

Non-Affiliation

This project is not affiliated with or endorsed by OpenClaw. It is an independent SDK.