Four tools with clear, domain-specific names and detailed descriptions (avg 180 chars). All have input schemas with typed parameters. However, output schemas are not documented in the visible code, and error handling guidance is minimal. Tool names follow verb_noun convention well (find_my_leagues, league_info, auth_status, setup_token). Descriptions are contextual and explain prerequisites and use cases, which is strong. Parameter descriptions are present but some lack format constraints (e.g., 'season' accepts string but no validation shown). No tool annotations (readOnlyHint/destructiveHint) visible in schema definitions.

• Document output schemas for all four tools. Example: find_my_leagues should return {user_id: string, display_name: string, leagues: [{league_id: string, league_name: string, roster_id: string, ...}]}. This enables LLMs to chain calls and extract needed IDs.
• Add tool annotations to input schemas: readOnlyHint=true for find_my_leagues, league_info, auth_status; destructiveHint=true for setup_token (it modifies config). This signals intent to LLMs and clients.
• Constrain 'season' parameter: add enum or regex pattern (e.g., /^\d{4}$/) and document valid range (e.g., '2020 - 2026'). Replace 'e.g. 2026' with a formal constraint.
• Reconcile setup_token description with schema: either add 'confirm' parameter to schema or remove reference from description. Mismatches confuse LLMs.
• Add error recovery guidance to each tool description. Example: 'If username not found, try search_users() or check spelling. If token rejected, call auth_status() to diagnose.'

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

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