Mindstate demonstrates solid tool design with 15 well-named, verb-prefixed tools covering memory, session, project, and handoff management. All tools have descriptions (avg ~80 chars) and input schemas with type definitions. However, output schemas are undocumented, responses are returned as JSON strings without formal schema declarations. Parameter descriptions are present but often terse (e.g., 'Session ID (UUID format)' lacks context on when/why to use). Error handling is minimal; no recovery guidance or actionable error messages visible. Security patterns (permission checks via actor() function) are implemented server-side but not declared in tool metadata. Composition is strong, tools chain logically (start_session → heartbeat_session → complete_session). Naming follows verb_noun convention consistently.

• Document output schemas for all tools. Define response structure (e.g., { memories: Memory[], total: number, nextCursor?: string }) so LLMs can plan downstream calls.
• Add error handling with recovery guidance. Return structured errors: { code: 'NOT_FOUND', message: 'Session not found', suggestion: 'Call list_sessions() to find an active session' }.
• Expand parameter descriptions with context. Replace 'Session ID (UUID format)' with 'Session ID (UUID format). Obtain from start_session() or list_sessions(). Required to keep a session alive via heartbeat_session().'
• Add tool annotations. Mark save_memory, relate_memories, create_project, create_handoff, claim_handoff, release_handoff with destructiveHint: true. Mark search_memories, get_context, get_briefing, list_sessions, list_projects, list_handoffs with readOnlyHint: true. Mark heartbeat_session with idempotentHint: true.
• Declare permission scopes in tool metadata. Add scope field to each tool (e.g., scope: 'memory:read' for search_memories, scope: 'memory:write' for save_memory) to enable least-privilege agent configuration and audit trails.