mcp-language-server gives MCP enabled clients access semantic tools like get definition, references, rename, and diagnostics.
{
"mcpServers": {
"language-server": {
"env": {
"LOG_LEVEL": "DEBUG"
},
"args": [
"--workspace",
"/path/to/workspace",
"--lsp",
"language-server-executable"
],
"command": "/full/path/to/your/clone/mcp-language-server/mcp-language-server"
}
}
}Are you the author?
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mcp-language-server gives MCP enabled clients access semantic tools like get definition, references, rename, and diagnostics.
Is it safe?
No known CVEs for pyright.
No authentication — any process on your machine can connect.
BSD-3-Clause. View license →
Is it maintained?
Last commit 38 days ago. 1,502 stars. 1,529,390 weekly downloads.
Will it work with my client?
Transport: stdio, sse, http. Works with Claude Desktop, Cursor, Claude Code, and most MCP clients.
Context cost
6 tools. ~300 tokens (0.2% of 200K).
Run this in your terminal to verify the server starts. Then let us know if it worked — your result helps other developers.
npx -y 'pyright' 2>&1 | head -1 && echo "✓ Server started successfully"
After testing, let us know if it worked:
definitionRetrieves the complete source code definition of any symbol (function, type, constant, etc.) from your codebase.
referencesLocates all usages and references of a symbol throughout the codebase.
diagnosticsProvides diagnostic information for a specific file, including warnings and errors.
hoverDisplay documentation, type hints, or other hover information for a given location.
rename_symbolRename a symbol across a project.
edit_fileAllows making multiple text edits to a file based on line numbers. Provides a more reliable and context-economical way to edit files compared to search and replace based edit tools.
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Persistent memory using a knowledge graph
Pre-build reality check. Scans GitHub, HN, npm, PyPI, Product Hunt — returns 0-100 signal.
Privacy-first. MCP is the protocol for tool access. We're the virtualization layer for context.
Monitor browser logs directly from Cursor and other MCP compatible IDEs.
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This is an MCP server that runs and exposes a language server to LLMs. Not a language server for MCP, whatever that would be.
mcp-language-server helps MCP enabled clients navigate codebases more easily by giving them access semantic tools like get definition, references, rename, and diagnostics.

go install github.com/isaacphi/mcp-language-server@latest