Four tools with reasonable naming (verb_noun pattern) and present descriptions, but significant gaps in schema completeness and parameter documentation. create_series and create_character have detailed input schemas with descriptions, but list_series and get_series lack visible input validation. Output schemas are not documented. Descriptions are adequate (100-200 chars) but lack dependency hints and recovery guidance. No error handling patterns visible. Tool composition is reasonable but lacks idempotency guarantees.

• Document output schemas for all tools. Example for create_series: 'Returns {seriesId: number, title: string, createdAt: string}'. This enables agents to chain calls and extract required IDs.
• Add pagination to list_series: accept limit (1-100, default 20) and offset/cursor parameters. Return total count and next_cursor. Document in description: 'Returns up to 20 series per page.'
• Add error recovery hints to descriptions. Example: 'If series not found, call list_series() to see available series. If character creation fails, verify seriesId exists via get_series().'
• Declare idempotency for create_series and create_character. Either guarantee idempotency (same input = same output, no duplicates) or add an optional idempotency_key parameter.
• Add per-parameter constraints to create_series. Example: theme should be an enum (hidden_identity|betrayal|revenge|...) not free-form string. Prevents hallucinated theme values.