Introduction

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What is Pylance MCP Pro?

Pylance MCP Pro is a professional, production-ready Model Context Protocol (MCP) server that exposes the full power of Microsoft’s Pylance/Pyright language server to AI coding assistants with advanced features like OpenTelemetry tracing and conversation logging. It enables Claude Desktop, Cursor, Continue.dev, Windsurf, and other MCP-compatible clients to autonomously analyze, refactor, type-check, and fix entire Python codebases with zero human intervention.

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Features

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🧠 IntelliSense Completions

Full LSP completion support with type inference. Get context-aware suggestions with function signatures, parameter hints, and docstrings—exactly like VS Code.

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⚡ Instant Type Checking

Pyright-powered static analysis catches type errors, undefined variables, and import issues before runtime. Zero-config diagnostics for the entire workspace.

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🎯 Go-to-Definition

Jump to function, class, or variable definitions across files, packages, and virtual environments. Works with stdlib, third-party libs, and your code.

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🔍 Find All References

Locate every usage of a symbol across your entire codebase in milliseconds. Perfect for refactoring or understanding data flow in complex projects.

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💡 Hover Type Info

Inspect type annotations, function signatures, and docstrings on-demand. See inferred types, parameter info, and return types without leaving your flow.

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🔄 Safe Symbol Renaming

Rename variables, functions, or classes across multiple files with guaranteed correctness. LSP ensures all references are updated atomically.

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✨ Auto-Format & Fix

Format Python code with Black/autopep8 integration. Apply quick fixes for imports, type hints, and common issues with a single command.

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🗂️ Workspace Intelligence

Multi-file edits, bulk refactoring, and project-wide operations. Create, modify, or delete files programmatically via LSP workspace edits.

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🐍 Venv Auto-Detection

Automatically discovers Python interpreters, virtual environments, and package dependencies. Supports conda, venv, poetry, and system Python.

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🔬 Deep Code Analysis

Advanced diagnostics beyond syntax: unused imports, unreachable code, type narrowing issues, and missing type stubs. Powered by Pyright’s type checker.

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🌐 MCP Protocol Native

Built on Model Context Protocol—works seamlessly with Claude Desktop, Cursor, Continue.dev, Windsurf, and any MCP-compatible client.

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📊 Training Data Export

Optional logging of all prompts, responses, and tool calls to SQLite. Export to JSONL for fine-tuning your own models on real Python workflows.

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Why Pylance MCP Pro?

Traditional AI coding assistants are limited to simple text manipulation without deep understanding of Python semantics. Pylance MCP Pro bridges this gap by providing:

• Complete Type Awareness: Full Pyright type checking and inference
• Zero Configuration: Works out of the box with any Python project
• Production Ready: Secure, fast, and battle-tested
• MCP Native: Integrates seamlessly with any MCP client
• Open Source: MIT licensed, community-driven

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Supported Clients

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Next Steps