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Find Ruby classes, modules, and constants with zero resolved references across the codebase. Uses rubydex's semantic resolution for high accuracy compared to string-matching approaches. - Params: kind filter, file_path prefix, limit/offset pagination - Response: name, kind, file, line, owner per dead constant - Excludes infrastructure declarations (Object, BasicObject, Module, Class) - Sorted by FQN for deterministic pagination
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Summary
Adds a
detect_dead_constantsMCP tool that finds Ruby constants with zero resolved references — dead code candidates.Supports
kindfilter,file_pathprefix filter, and pagination. Excludes infrastructure declarations and anonymous classes.Real-world validation
Tested against RDoc (411 declarations in
lib/). Instead of cross-referencing all 411 constants manually with grep,detect_dead_constantsnarrowed the list to 22 candidates instantly. After filtering false positives (dynamic access viaconst_get/const_defined?, type annotations), 5 confirmed dead constants were removed: ruby/rdoc#1642Also tested against Tapioca (48 candidates in
lib/), which surfaced 1 confirmed dead constant (ASSOCIATION_METHODS).