Single tool with critical definition gaps. Tool name 'get_similar_file_names' is verb-led and clear, but the input schema is severely underdeveloped. Only one parameter (match_string: string) with minimal description. No output schema documented, returns a list but structure is undefined. No error handling guidance, no pagination despite returning lists, no parameter constraints. Description is adequate (67 chars) but lacks context on when to use, prerequisites (S3 bucket hardcoded), or what the returned list contains. Tool is read-only but lacks explicit idempotent annotation. Fails multiple critical patterns: no output schema documentation, no pagination for list results, no error recovery guidance.

• Document output schema: specify that the tool returns a list of strings (file names) and optionally include match scores. Example: [{"name": "file.csv", "score": 0.95}].
• Add bucket and prefix as optional parameters with defaults. Allow LLM to query different S3 locations without code changes. Validate bucket name format.
• Add limit and offset parameters to support pagination. Return total_count and next_offset in response. Document the default limit (currently 5) and maximum allowed.
• Enhance match_string parameter description: 'A file name or partial name to search for (1-255 chars, case-insensitive). Fuzzy matching will find similar names even with typos.'
• Add error handling: catch boto3 exceptions (NoCredentialsError, NoSuchBucket, AccessDenied) and return actionable messages like 'S3 bucket not found. Verify bucket name and AWS credentials.'