NapCat MCP exposes 46 tools with consistent naming (verb_noun pattern) and basic parameter schemas. All tools have descriptions and input schemas with type definitions. However, descriptions are often terse (10-50 chars), many lack actionable context for LLM selection, and output schemas are not documented. Parameter descriptions exist but frequently omit constraints, ranges, or format guidance. Error handling is minimal, no recovery guidance or categorization. Security concerns: credentials (cookies, domain) exposed as parameters; no permission gates on destructive operations (kick, ban, delete); no audit trail hints. Composition is reasonable (single-responsibility tools), but some tools conflate concerns (send_msg accepts both group and private modes). Overall: functional but below production baseline for agent-facing tools.

• Expand tool descriptions to 50-200 chars with WHAT, WHEN, and prerequisites. E.g., 'Get group information' → 'Retrieve group metadata (name, owner, member count, creation date). Call this first to verify group exists before sending messages or managing members.'
• Document output schemas for all tools. Add a 'Returns' section to each description listing key fields and types. E.g., 'Returns: {group_id: int, group_name: str, member_count: int, owner_id: int}'.
• Add permission gates to destructive tools (kick, ban, delete, dismiss). Verify the calling agent/user has group admin or owner authority before executing. Return 'Permission denied: requires group admin role' if unauthorized.
• Move credentials (cookies, domain) to server-side configuration. Remove get_cookies and get_credentials as tool parameters. Inject auth via environment variables or a secure vault, and use them internally in the NapCat client.
• Add error recovery guidance. For each tool, document common failure modes and recovery steps. E.g., 'If group_id not found, call get_group_list() to discover available groups.' Include error classification (retryable, user-fixable, fatal).