MCP-Plugin-dotnet
Provides a bridge between MCP clients (via stdio/http) and in-process .NET apps by exposing .NET methods as MCP tools/prompts/resources. The .NET app hosts an in-app SignalR client that connects to a standalone MCP bridge server (McpPlugin.Server), which then serves MCP over stdio/http transports. Tools/prompt/resource schemas are generated from C# types using ReflectorNet, with attribute-based registration and optional fuzzy method matching.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Security model appears to rely on (a) optional bearer token for plugin connections and (b) optional synchronous authorization webhook; analytics webhooks include a token and HMAC signature field description (when webhook-token configured). TLS is not explicitly mandated in docs excerpt (examples use http://localhost; production guidance mentions using HTTPS for webhook endpoints). Scope granularity for authorization is not described. Fire-and-forget analytics webhook failures are logged but not blocking.
⚡ Reliability
Best When
You have a long-running .NET process (e.g., Unity Editor or desktop app) and want MCP clients to interact with that live instance through a persistent bridge and strongly-typed tool schemas.
Avoid When
You cannot reliably secure SignalR and MCP endpoints (e.g., no TLS/auth, no allowlists, or fail-open authorization).
Use Cases
- • Expose Unity/WPF/Game-server running state to an MCP-capable AI assistant without repeatedly spawning new processes
- • Build MCP-powered internal copilots that can call .NET business logic (tools) and return results/resources
- • Connect multiple long-lived .NET apps to a central MCP bridge for interactive workflows
- • Add observability via analytics webhooks and gate connections via an authorization webhook
Not For
- • Public internet deployments without hardening the auth/network layer
- • Use cases requiring strict, well-defined tool-selection behavior without fuzzy matching risk
- • Organizations needing a fully specified REST/OpenAPI contract or SDK for non-.NET ecosystems
- • Teams that require explicit, documented idempotency semantics for tool calls
Interface
Authentication
Auth is primarily described via a bearer-token requirement for connecting plugins plus optional connection authorization webhook. OAuth/scopes are not indicated.
Pricing
Open-source library (NuGet badge shown). No hosted pricing described.
Agent Metadata
Known Gotchas
- ⚠ Fuzzy method matching (method name match level) can lead to unexpected tool selection if multiple similar method names exist
- ⚠ Tool side effects may not be idempotent; callers should consider retry safety
- ⚠ Transport configuration matters: client-transport=stdio vs streamableHttp impacts how the bridge accepts MCP clients
- ⚠ Authorization webhook may be configured fail-open; for security-sensitive deployments prefer fail-closed (fail-open=false)
Alternatives
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Scores are editorial opinions as of 2026-03-30.