Tree Sitter MCP Server

Tree-sitter MCP Server

An MCP server that shows coding agents the Tree-sitter syntax tree of a code snippet, so they can check node kinds, field names, and positions before writing Tree-sitter queries or code that walks a syntax tree.

Installation

Claude Code:

claude mcp add tree-sitter -- npx -y tree-sitter-mcp-server

Codex:

codex mcp add tree-sitter -- npx -y tree-sitter-mcp-server

Other clients:

{
  "mcpServers": {
    "tree-sitter": {
      "command": "npx",
      "args": ["-y", "tree-sitter-mcp-server"]
    }
  }
}

npx needs Node.js. Without it, install the binary with cargo install --locked tree-sitter-mcp-server or download it from the releases, and use tree-sitter-mcp-server as the command.

Clients that browse the MCP Registry, such as VS Code, can also install it from there.

mcp-name: io.github.joowani/tree-sitter-mcp-server

Supported Languages

c, cpp, csharp, go, graphql, hcl, java, javascript, json, jsx, kotlin, php, prisma, protobuf, python, ruby, rust, sql, swift, terraform, thrift, toml, tsx, typescript, yaml

Names are case-insensitive, and common aliases such as c++, c#, py, and ts also work. javascript and jsx use the TypeScript and TSX grammars, and terraform uses the HCL grammar. PHP code must start with <?php.

Tool

get_tree_sitter_ast returns the syntax tree of code in language, one named node per line, with field names and zero-based (row-column) ranges. ERROR and MISSING nodes mark syntax errors.

{
  "language": "python",
  "code": "x = 1"
}

module (0-0) - (0-5)
  expression_statement (0-0) - (0-5)
    assignment (0-0) - (0-5)
      left: identifier (0-0) - (0-1)
      right: integer (0-4) - (0-5)