Which integrations are available for this server?

Provides language intelligence for C and C++ via integration with clangd, including diagnostics, cross-file navigation (go-to-definition, go-to-declaration), find references, code completion, and document formatting capabilities. Provides comprehensive language intelligence for JavaScript via integration with typescript-language-server, including real-time diagnostics, cross-file navigation (go-to-definition, find references), code completion, refactoring tools, and workspace-wide symbol search. Provides language intelligence for PHP via integration with intelephense, including diagnostics, code completion, navigation features (go-to-definition, find references), and workspace-wide symbol search. Provides language intelligence for Python via integration with pyright-langserver, including type-checking diagnostics, cross-file navigation (go-to-definition, find references), code completion, signature help, and automated refactoring capabilities. Provides comprehensive language intelligence for Rust via integration with rust-analyzer, including real-time diagnostics, cross-file navigation (go-to-definition, find references, go-to-implementation), code completion, and symbol renaming across the workspace. Provides comprehensive language intelligence for TypeScript via integration with typescript-language-server, including real-time diagnostics, cross-file navigation (go-to-definition, find references), code completion, refactoring tools, and workspace-wide symbol search.

How do I use LSP-MCP?

1. Click on "Install Server". 2. Wait a few minutes for the server to deploy. Once ready, it will show a "Started" state. 3. In the chat, type @ followed by the MCP server name and your instructions, e.g., "@LSP-MCP go to definition of handleRequest" That's it! The server will respond to your query, and you can continue using it as needed. Here is a step-by-step guide with screenshots.

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LSP-MCP

by blackwell-systems

Overview Schema Related Servers Score Discussions

TypeScript

lsp-mcp

Blackwell Systems LSP 3.17 Languages License

The most complete MCP server for language intelligence. 22 tools covering navigation, diagnostics, refactoring, and formatting. CI-verified across 7 languages. Built directly against the LSP 3.17 specification.

Unlike typical MCP-LSP bridges, lsp-mcp maintains a persistent language server session — agents operate on a fully indexed workspace with real-time diagnostics and cross-file awareness, not a cold-started stub that forgets context between calls.

Why lsp-mcp

	lsp-mcp	typical alternatives
Languages (CI-verified)	7	1–2
Tools	22	3–5
LSP spec compliance	3.17, built to spec	ad hoc
Connection model	persistent	per-request
Cross-file references	✓	rarely
Real-time diagnostic subscriptions	✓	✗
Test coverage	76% statements, 86% functions	rarely tested

Quick Start

{
  "mcpServers": {
    "lsp": {
      "type": "stdio",
      "command": "npx",
      "args": ["blackwell-systems/LSP-MCP", "<language-id>", "<path-to-lsp-binary>", "<lsp-args>"]
    }
  }
}

TypeScript:

{ "args": ["blackwell-systems/LSP-MCP", "typescript", "typescript-language-server", "--stdio"] }

Go:

{ "args": ["blackwell-systems/LSP-MCP", "go", "gopls"] }

Rust:

{ "args": ["blackwell-systems/LSP-MCP", "rust", "rust-analyzer"] }

Multi-Language Support

Every language below is integration-tested on every CI run — start_lsp, open_document, get_diagnostics, and get_info_on_location all verified against the real language server binary:

Language	Server	Install
TypeScript / JavaScript	`typescript-language-server`	`npm i -g typescript-language-server typescript`
Python	`pyright-langserver`	`npm i -g pyright`
Go	`gopls`	`go install golang.org/x/tools/gopls@latest`
Rust	`rust-analyzer`	`rustup component add rust-analyzer`
Java	`jdtls`	eclipse.jdt.ls snapshots
C / C++	`clangd`	`apt install clangd` / `brew install llvm`
PHP	`intelephense`	`npm i -g intelephense`

Tools

All tools require start_lsp to be called first.

Session

Tool	Description
`start_lsp`	Start the language server with a project root
`restart_lsp_server`	Restart without restarting the MCP server
`open_document`	Open a file for tracking (required before position queries)
`close_document`	Stop tracking a file

Analysis

Tool	Description
`get_diagnostics`	Errors and warnings — omit `file_path` for whole project
`get_info_on_location`	Hover info (type signatures, docs) at a position
`get_completions`	Completion suggestions at a position
`get_signature_help`	Function signature and active parameter at a call site
`get_code_actions`	Quick fixes and refactors for a range
`get_document_symbols`	All symbols in a file (functions, classes, variables)
`get_workspace_symbols`	Search symbols by name across the workspace

Tool	Description
`get_references`	All references to a symbol across the workspace
`go_to_definition`	Jump to where a symbol is defined
`go_to_type_definition`	Jump to the type definition of a symbol
`go_to_implementation`	Jump to all implementations of an interface or abstract method
`go_to_declaration`	Jump to the declaration of a symbol (distinct from definition — e.g. C/C++ headers)

Refactoring

Tool	Description
`rename_symbol`	Get a `WorkspaceEdit` for renaming a symbol across the workspace
`prepare_rename`	Validate a rename is possible before committing
`format_document`	Get `TextEdit[]` formatting edits for a file
`apply_edit`	Apply a `WorkspaceEdit` to disk (use with `rename_symbol` or `format_document`)
`execute_command`	Execute a server-side command (e.g. from a code action)

Utilities

Tool	Description
`set_log_level`	Change log verbosity at runtime

Recommended agent workflow:

start_lsp(root_dir="/your/project")
open_document(file_path=..., language_id=...)
get_diagnostics()                          # whole project, no file_path
get_info_on_location(...) / get_references(...)
close_document(...)

Language IDs: typescript, typescriptreact, javascript, javascriptreact, python, go, rust, java, c, cpp, php

Resources

Diagnostic resources support real-time subscriptions — the server sends notifications/resources/updated when diagnostics change.

Scheme	Description
`lsp-diagnostics://`	All open files
`lsp-diagnostics:///path/to/file`	Specific file (subscribable)
`lsp-hover:///path/to/file?line=N&column=N&language_id=X`	Hover at position
`lsp-completions:///path/to/file?line=N&column=N&language_id=X`	Completions at position

LSP 3.17 Conformance

lsp-mcp is implemented directly against the LSP 3.17 specification and validated through integration testing against real language servers. Coverage includes:

Full lifecycle (initialize → initialized → shutdown) with graceful SIGINT/SIGTERM handling
Progress protocol — workspace-ready detection waits for all $/progress tokens to complete before sending references
Server-initiated requests (workspace/configuration, window/workDoneProgress/create, dynamic registration) — all correctly responded to, unblocking servers that gate workspace loading on these responses
Correct JSON-RPC framing, error code handling, and response shape normalization across hover, completion, code actions, and diagnostics

See docs/lsp-conformance.md for the full method coverage matrix and spec section references.

Extensions

Language-specific extensions add tools, prompts, and resource handlers, loaded automatically by language ID at startup.

To add an extension, create src/extensions/<language-id>.ts implementing any subset of getToolHandlers, getToolDefinitions, getResourceHandlers, getSubscriptionHandlers, getPromptDefinitions, and getPromptHandlers. All features are namespaced by language ID.

Development

git clone https://github.com/blackwell-systems/LSP-MCP.git
cd LSP-MCP && npm install && npm run build
npm test                   # all unit test suites
npm run test:multi-lang    # 7-language integration test (requires language servers)

Coverage: ~76% statements, ~86% functions. To inspect MCP traffic: claude --mcp-debug.

License

MIT

This server cannot be installed

security - not tested

license - permissive license

quality - not tested

How are these scores calculated?

Resources

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lsp-mcp

Why lsp-mcp

Quick Start

Multi-Language Support

Tools

Session

Analysis

Navigation

Refactoring

Utilities

Resources

LSP 3.17 Conformance

Extensions

Development

License

Resources

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