mcp

Diagnose MCP ECONNREFUSED safely: check the listener and address, wait with a deadline, retry nested connection errors, and distinguish TCP readiness from MCP initialization.

Diagnose MCP disconnects across Windows and WSL: check the actual launcher, stdio output, NAT versus mirrored networking, and evidence of process termination.

.NET 11 Preview 4 bundles the mcpserver project template directly into the SDK. No separate Microsoft.McpServer.ProjectTemplates install, no preview feed dance. Pick stdio or HTTP transport, opt into Native AOT, and dotnet new mcpserver -o MyServer is the whole setup.

Why your Claude tool call fails schema validation, in both flavours: the API rejecting your tool definition at request time, and Claude returning a tool_use block your runner cannot accept. Concrete fixes for each, with strict mode, oneOf/anyOf, additionalProperties, and the retry loop pattern.

Diagnose MCP stdio startup failures: separate protocol stdout from logs, use a complete SDK server, check launch paths and buffering, and configure startup timeouts.

A 2026 walkthrough for wiring RAG into Claude Code 2.1.x: when agentic grep stops scaling, how to attach a hybrid BM25 + dense vector MCP server, how to wrap a retrieval CLI in a custom skill, and how Anthropic's contextual embeddings technique pushes recall above 92%. Anchored to claude-sonnet-4-6, claude-opus-4-7, and Claude Context 0.x.

Create a Claude Code browser-testing subagent with an inline Playwright MCP server, explicit tools, an isolated browser profile, and evidence-based pass/fail reporting.

Wire an EF Core 10 DbContext into a Model Context Protocol server so Claude Code, Cursor, or any compliant client can run safe, scoped queries against your database. Covers IDbContextFactory lifetime, read-only projections, schema discovery tools, AsNoTracking, parameterised filters, row-level scoping, and the destructive-tool gates you need before letting an agent touch UPDATE.

Cursor's new @cursor/sdk public beta exposes the same runtime, harness, and models that drive the desktop app, CLI, and web UI as a TypeScript package. You get sandboxed cloud VMs, subagents, hooks, MCP, and token-based pricing in a few lines of code.

Microsoft's new Microsoft.AgentGovernance package wraps MCP tool calls with a policy kernel, a security scanner, and a response sanitizer. Here is what each piece does and how the wiring looks in C#.