MCP Server

Workspace-scoped AI agent infrastructure for .NET — context retrieval, TODO orchestration, session logging, repository operations, GitHub automation, GraphRAG, and agent orchestration over HTTP and MCP STDIO transports.

Key Features

• Dual transport — HTTP REST with Swagger UI and MCP-over-STDIO for direct agent integration

• Multi-tenant workspaces — single port, workspace isolation via header, API key, or default resolution

• Agent orchestration — process-isolated agent pool with branch strategies, PowerShell sessions, and desktop automation

• Semantic search — ONNX-based vector embeddings with HNSW indexing, optional GraphRAG enhancement

• Requirements traceability — FR/TR/TEST document management with validation and Markdown/ZIP export

• Multi-provider storage — SQLite, SQL Server, and PostgreSQL with automatic migrations

• REPL CLI tool — mcpserver-repl for interactive use and agent STDIO access via single-line JSON request envelopes

• Typed .NET client — SharpNinja.McpServer.Client NuGet package covering all API endpoints

Related MCP server: Containerized Strands Agents

Quick Start

# Build
./build.ps1 Compile

# Run
./build.ps1 StartServer --instance default

# Test
./build.ps1 Test

Open Swagger at http://localhost:7147/swagger.

Architecture

src/
  McpServer.Support.Mcp     ASP.NET Core server (controllers, STDIO host, auth)
  McpServer.Client           Typed REST client library (NuGet)
  McpServer.McpAgent         Microsoft Agent Framework integration
  McpServer.Repl.Core        REPL protocol, request envelopes, trust bootstrap
  McpServer.Repl.Host        mcpserver-repl CLI tool
  McpServer.Services         Business logic (ingestion, indexing, TODO, GitHub, agents)
  McpServer.Storage          EF Core abstraction + vector indexing
  McpServer.GraphRag         Hybrid semantic search with GraphRAG
  McpServer.Cqrs             Lightweight async CQRS framework (NuGet)
  McpServer.Cqrs.Mvvm        MVVM extensions for CQRS
  McpServer.Launcher          Windows GUI launcher
  McpServer.ServiceDefaults  Aspire service defaults, OpenTelemetry, health checks

Transports

HTTP

./build.ps1 StartServer --instance default
# Listens on http://localhost:7147

MCP STDIO

dotnet run --project src/McpServer.Support.Mcp -- --transport stdio --instance default

REPL

./build.ps1 InstallReplTool
mcpserver-repl --interactive              # interactive mode
mcpserver-repl --agent-stdio              # STDIO mode for agent integration

Direct --agent-stdio callers send one single-line JSON request envelope per stdin line. Do not send formatted YAML or a type: batch envelope.

API Surface

Configuration

Primary config section: Mcp. Instance overrides under Mcp:Instances:{name}.

{
  "Mcp": {
    "Port": 7147,
    "RepoRoot": ".",
    "DataSource": "mcp.db",
    "ApiKey": "your-api-key",
    "TodoStorage": { "Provider": "yaml" },
    "Instances": {
      "default": { "Port": 7147, "RepoRoot": "." },
      "alt-local": { "Port": 7157, "TodoStorage": { "Provider": "sqlite" } }
    }
  }
}

Environment overrides: PORT (runtime port), MCP_INSTANCE (instance selection).

Authentication

Storage

Database providers (EF Core with automatic migrations):

TODO items can be stored as YAML files on disk (yaml) or in a SQLite table (sqlite), configured per instance.

Vector indexing uses ONNX Runtime with Sentence Transformer embeddings and HNSW index for semantic search.

Deployment

Build System

Nuke build orchestrator via ./build.ps1 (or ./build.sh on Linux/macOS).

CI/CD

Client Library

dotnet add package SharpNinja.McpServer.Client

builder.Services.AddMcpServerClient(options =>
{
    options.BaseUrl = new Uri("http://localhost:7147");
    options.ApiKey = "your-api-key";
});

Covers: Todo, Context, SessionLog, GitHub, Repo, Workspace, ToolRegistry, Sync, and more.

Source: src/McpServer.Client/ | Package README

Agent Framework

McpServer.McpAgent integrates with the Microsoft Agent Framework:

builder.Services.AddMcpServerMcpAgent();

Built-in MCP tools: mcp_repo_read, mcp_repo_list, mcp_repo_write, mcp_desktop_launch, mcp_powershell_session_*. Workflows: session log lifecycle, TODO management, requirements ingestion.

Sample host: src/McpServer.McpAgent.SampleHost/

Tests

16 test projects covering unit, integration, and SpecFlow validation:

• Build.Tests — build system and configuration (43 tests)

• McpServer.Support.Mcp.Tests / .IntegrationTests — server API and database

• McpServer.Client.Tests — REST client serialization

• McpServer.McpAgent.Tests — agent workflows and tool adapters

• McpServer.Repl.Core.Tests / .IntegrationTests — REPL protocol

• McpServer.Cqrs.Tests — CQRS dispatcher and pipeline

• 7 SpecFlow validation projects (Context, GitHub, Repo, SessionLog, Todo, ToolRegistry, Workspace)

Prerequisites

• .NET SDK (version in global.json)

• PowerShell 7+ (pwsh.exe)

• Optional: Windows SDK (makeappx.exe) for MSIX, GitHub CLI (gh) for GitHub endpoints

Documentation

License

See LICENSE for details.

Shared Plugin Surfaces

This repository is the canonical home for the shared client surfaces used by all McpServer agent plugins:

• PowerShell: tools/powershell/McpRepl (published to PS Gallery as McpRepl)

• TypeScript: tools/typescript/mcp-repl-ts (published to npm as @sharpninja/mcp-repl)

See the respective READMEs in those directories and GROK-USAGE.md in the grok-plugin for usage details.