Xmp4 MCP server

What it does

xmp4 is a hosted MCP server that indexes 856 open-source libraries using SCIP semantic code analysis, allowing AI agents to query source code, callers, type hierarchies, and usages without cloning repositories. It supports C#, Java, TypeScript, Python, Rust, and PHP with full coverage, and Go, JavaScript, Dart, Ruby, and C++ with best-effort support.

• Find all callers of a specific function or method across a library without grepping the codebase.
• Retrieve the signature, implementation body, and type hierarchy of a symbol in an OSS library.
• Discover test files and test cases that exercise a particular piece of library code.

Tools this server exposes

Tool	Does
xmp4_search	Search for symbols across indexed libraries by name.
xmp4_info	Get the signature and metadata of a symbol.
xmp4_source	Retrieve the source code body of a symbol.
xmp4_callers	Find all semantic callers of a symbol.
xmp4_callees	Find all functions or methods called by a symbol.
xmp4_usages	List all usages of a symbol across the codebase.
xmp4_hierarchy	Get the type hierarchy (base classes, implementations) of a symbol.
xmp4_tests_for	Find test files that exercise a given symbol.
xmp4_outline	Get the outline structure of a file or module.
xmp4_view	Retrieve raw file content by line range.
xmp4_grep	Perform server-side regex search when semantic queries are insufficient.
xmp4_deps	List dependencies of a library or project.
xmp4_symbol_at	Get the symbol at a specific file location.
xmp4_projects	List indexed projects in a library.
xmp4_guide	Get a skill pointer and cheatsheet for using xmp4 tools.
xmp4_server	Return server version and indexing statistics.

Before you enable it

An MCP server runs with whatever access you give it. Start with a development account rather than production, and check which tools the server exposes before you let an agent call them unattended.