agent-lsp
MCP server for language intelligence. Give AI agents structured access to language servers: go-to-definition, find-all-references, rename, diagnostics, completions, call hierarchy, and speculative execution.
66 tools. 23 agent workflows. 30 CI-verified languages. Single Go binary.
Why
AI coding agents navigate code with grep and file reads. This wastes 5-34x more tokens than necessary and produces 92-99% false positives on symbol lookups. Language servers already have the answers; agent-lsp makes them accessible via MCP.
Install
pip install agent-lsp
Or via other channels:
brew install blackwell-systems/tap/agent-lsp # macOS/Linux
npm install -g @blackwell-systems/agent-lsp # npm
curl -fsSL https://raw.githubusercontent.com/blackwell-systems/agent-lsp/main/install.sh | sh
Usage
# Start with auto-detection
agent-lsp
# Explicit language server
agent-lsp go:gopls typescript:typescript-language-server,--stdio
# HTTP mode
agent-lsp --http --port 8080 go:gopls
Then configure your AI tool's MCP settings to point at agent-lsp.
What it does
- 66 tools covering navigation, analysis, refactoring, diagnostics, formatting, speculative execution, composite exploration, safe editing, build, test, and more
- 23 agent workflows (skills) that encode correct multi-step operations: rename safely, analyze blast radius, simulate edits before applying
- 30 CI-verified languages: Go, Python, TypeScript, Rust, Java, C, C++, C#, Ruby, PHP, Kotlin, Swift, Scala, Zig, Lua, Elixir, Gleam, and more
- Speculative execution: preview edits in memory, see what breaks before touching disk
- Phase enforcement: blocks out-of-order operations so agents follow correct workflows
Token savings
Measured across 5 codebases (Go, TypeScript, Python):
| Codebase | Lines | Savings |
|---|---|---|
| agent-lsp | 15K | 5x |
| Hono (TypeScript) | 24K | 13x |
| FastAPI (Python) | 33K | 2x |
| Next.js (TypeScript) | 196K | 5x |
| HashiCorp Consul (Go) | 319K | 34x |
Full experiment: agent-lsp.com/token-savings
Works with
Claude Code, Cursor, Windsurf, GitHub Copilot, and any MCP-compatible client.
Links
1 maintainer
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