Single tool with minimal definition quality. Tool name 'list_dir' is appropriately verb-prefixed and clear. Description is present but generic (28 chars, below 50-char baseline for clarity). Input schema exists with proper JSON Schema structure and type definition, but parameter description is minimal ('Directory path', 14 chars, well below 72-char baseline). No output schema documented. No error handling guidance for LLMs (returns raw error dicts). No parameter constraints (min/max path length, allowed characters). Tool lacks idempotency hints, permission declarations, and security context. Composition is single-purpose (acceptable), but lacks integration hints for chaining.

• Expand tool description to 80 - 150 characters. Include: what it does, when to call it, what it returns. Example: 'List files and subdirectories in a directory. Use to explore filesystem structure before reading or modifying files. Returns array of {name, type}.'
• Document output schema explicitly. Declare return type as object with fields: {type: 'directory'|'error', path: string, contents?: [{name: string, type: 'file'|'directory'}], error?: string}. This enables LLMs to parse results reliably.
• Enhance parameter description. Change 'Directory path' to: 'Absolute or relative directory path (e.g., /home/user, ./data, ~/Documents). Max 4096 chars. Expands ~ to home directory. No path traversal allowed.'
• Add error recovery guidance. Instead of returning {'error': 'Path does not exist'}, return {'error': 'Path does not exist. Verify the path is correct and you have read permissions. Try /tmp or /home to test.'}
• Add security/permission hints to description. Clarify: 'Requires read permission on the directory. Returns only names and types, not file contents or metadata. Symlinks are followed.'