search_plugins, get_plugin, and check_runtime each target a clearly different operation (fuzzy search, single-package detail, compatibility check). list_categories partially overlaps with search_plugins since search supports category filtering, but it still adds distinct category enumeration and counts.

All four tools follow a consistent snake_case verb_noun pattern: search_plugins, get_plugin, list_categories, check_runtime. The convention is predictable and readable across the whole set.

Four tools is modest but well-matched to a read-only plugin catalog: discovery, detail, taxonomy, and compatibility. Nothing feels redundant, though the surface is somewhat thin for a marketplace.

The set covers search, single-plugin detail, category listing, and DSH version compatibility, which is most of the read-only lifecycle for a plugin registry. Minor gaps like explicit pagination or listing all plugins (partially covered by search with no query) are workable.