thealgorithms-mcp

mcp-name: io.github.mcande21/thealgorithms-mcp

An MCP server for querying the TheAlgorithms org across every language repo — search algorithm implementations and fetch any one with its in-file examples.

Languages are auto-discovered from the org (not a hardcoded list): a repo is indexed when it publishes a parseable DIRECTORY.md — currently 24 languages (Python, Java, C++, JavaScript, Rust, C, TypeScript, PHP, Dart, Kotlin, Ruby, R, Scala, Swift, Julia, Haskell, MATLAB, Zig, Fortran, Nim, Clojure, F#, Jule, aarch64-assembly). Repos without a DIRECTORY.md (Go, C#, Lua, Solidity, …) are reported by list_languages with their exclusion reason — no silent gaps.

Hybrid design: each repo's DIRECTORY.md index is cached locally (ETag + TTL); file contents are fetched on demand from raw.githubusercontent.com. The org/language manifest is auto-discovered via the GitHub API and cached 7 days. No token required (set GITHUB_TOKEN to raise the rate limit). See DESIGN.md.

Tools

Tool	Purpose
`list_languages()`	Indexed languages (+ counts, aliases) and excluded repos with reasons
`list_categories(language='python')`	Categories with entry counts for a language
`search_algorithms(query, language='python', category?, limit=10)`	Ranked `{name, category, path, score}`
`get_category(category, language='python')`	Every algorithm in a category
`get_algorithm(path, language='python', include_source=True)`	Source + extracted examples
`compare(name, languages?, min_score=90, limit_per_language=1)`	Real matches across languages + `missing_in`
`suggest(prefix, language='python', limit=10)`	Trie-backed name autocomplete (`dij` → Dijkstra)

language accepts names or aliases (cpp/c++, js, ts, …). Typical flow: search_algorithms("dijkstra", language="rust") → get_algorithm("src/graph/dijkstra.rs", language="rust"). Examples are extracted where the language has an in-file convention (Python doctests, Rust doc-tests); other languages return source plus a note.

Install

From PyPI (recommended):

config.json

{ "thealgorithms": { "command": "uvx", "args": ["thealgorithms-mcp"] } }

From GitHub:

config.json

{ "thealgorithms": {
    "command": "uvx",
    "args": ["--from", "git+https://github.com/mcande21/thealgorithms-mcp", "thealgorithms-mcp"] } }

From a local checkout (development):

bash

uv sync
uv run thealgorithms-mcp          # serves over stdio

Add any of the above to ~/.normandy-generic/mcp.json (or your MCP client config).

Verify

bash

uv run python scripts/verify_stdio.py                 # multi-language contract over stdio
uv run python scripts/verify_language.py rust         # one language, end-to-end

The harness spawns the server over stdio and asserts every tool against the live org, including binary-search fetch across ≥8 languages and cross-language compare().