ctf-buster exposes 7 tools via rmcp with basic schema coverage but significant quality gaps. Tool naming follows verb_noun convention (list_challenges, get_challenge, submit_flag, etc.), which is correct. However, descriptions are minimal, most fall between 50-100 characters, which is below the production baseline of 194 chars. Parameter descriptions exist but are sparse (5-20 chars). Critically, input schemas are present and properly typed (string, boolean, integer with descriptions), but the rubric baseline shows 94% of A+ tools have comprehensive param docs; this server averages ~1-2 params per tool with minimal constraint documentation (no enums, no ranges, no format specs). Output schemas are not visible in the provided source code, only tool definitions are shown. Error handling is mentioned in features (errorReporting=true) but no recovery guidance is visible in tool descriptions. The READ_ONLY and WRITE risk labels suggest risk awareness, but they are not reflected in tool annotations (toolAnnotations=false). Overall, this is a functional but basic implementation that would benefit from expanded descriptions, output schema documentation, and formal parameter constraints.

• Expand tool descriptions to 150 - 250 characters. Example for get_challenge: 'Retrieve detailed information about a specific challenge including description, hints, attached files, and submission history. Use id_or_name parameter with either the numeric challenge ID (e.g. 42) or the challenge slug (e.g. crypto-rsa). Call this after list_challenges to drill into a single challenge.'
• Add enum or regex constraints for 'id_or_name' params. Example: 'challenge_id_or_name: numeric ID (digits 1-9 only, e.g. 123) or kebab-case slug (lowercase letters, digits, hyphens; max 50 chars; e.g. crypto-rsa-basics).'
• Document output schemas inline or via comments. Example for get_challenge: 'Returns {id: string, name: string, category: string, points: integer, description: string, solved_by_me: boolean, attachments: [{filename: string, url: string}]}'
• Add error handling guidance to tool descriptions. Example for submit_flag: 'Returns success/failure. On failure: 'invalid_flag' (flag format unrecognized), 'wrong_flag' (flag incorrect), 'already_solved' (challenge already completed), 'not_found' (challenge does not exist). See list_challenges to verify challenge is available.'
• Add range constraints to numeric params. Example for get_scoreboard limit: 'Number of entries to return (1 - 100; default 20). Larger limits may timeout.'
• Enable toolAnnotations=true and apply readOnlyHint=true to list_challenges, get_challenge, get_scoreboard, get_workspace_status; apply destructiveHint=true to submit_flag, sync_challenges, download_files.

Inferred effective spec: <=2025-11-25.

• Relies on Logging (deprecated) - log to stderr or use OpenTelemetry