Single tool 'nix' with complex, overloaded parameter set. Tool name lacks action verb (should be 'search_nix' or 'query_nix'). Description is adequate (95 chars) but parameters are poorly organized. Schema present but parameters lack individual descriptions, only brief hints in the 'description' field. No output schema documented. Parameter 'action' uses free-form string instead of enum despite listing fixed options (search|info|stats|options|channels|flake-inputs|cache). Many parameters are context-dependent with undocumented relationships (e.g., 'source' validity depends on 'action'). No error handling guidance visible. Tool attempts to do too much (search, info, stats, options, channels, flake-inputs, cache) in one call, violating single-responsibility principle.

• Rename 'nix' to 'search_nix_packages' and split multi-action tool into separate tools: search_nix_packages, get_nix_package_info, get_nix_options, list_nix_channels, list_flake_inputs, check_nix_cache. Each tool should have one clear responsibility.
• Convert 'action' parameter to an enum: {"type": "string", "enum": ["search", "info", "stats", "options", "channels", "flake-inputs", "cache"]}. Remove free-form string.
• Add individual descriptions to every parameter. Example: 'source' → 'Package source to query (nixos, home-manager, darwin, flakes, flakehub, nixvim, wiki, nix-dev, noogle, nixhub). Required for most actions.'
• Document output schema in tool description. Example: 'Returns a list of packages with fields: name (string), version (string), description (string), maintainers (array), homepage (string).'
• Add error handling guidance. Example: 'If query returns no results, try a shorter search term or check the source parameter. If cache action fails, verify system parameter matches your architecture (e.g., x86_64-linux).'