Four tools with clear verb-noun naming (list_flows, create_session, list_sessions, get_session) and comprehensive descriptions (150 - 250 chars each). All tools have Zod schemas with typed parameters and descriptions. Strengths: good discovery pattern (list_flows → create_session), clear PII warnings, locale enum. Weaknesses: no output schema documentation, no pagination for list_sessions despite potentially large result sets, no error recovery guidance, missing tool annotations (readOnlyHint/destructiveHint).

• Add formal output schemas to each tool. Document the structure of sessionId, playerUrl, sessionStatus, outcome, createdAt, and any nested fields. Use Zod or JSON Schema comments to make this machine-readable.
• Add pagination to list_sessions: introduce 'limit' (default 20, max 100) and 'offset' (default 0) parameters. Return a 'total' count and 'has_more' flag so LLM can iterate safely.
• Annotate tools with readOnlyHint and destructiveHint. Mark list_flows, list_sessions, get_session as readOnly=true; mark create_session as destructive=true (or idempotent=true if flowId+subjectId uniqueness is enforced).
• Enhance error messages with recovery guidance. E.g., 'Flow not found: FLOW_ID. Call list_flows() to see available flows.' or 'Session not found: SESSION_ID. Check the sessionId from create_session or list_sessions.'
• Expose the 'input' parameter in create_session schema if it is intended for LLM use. If it is internal-only, remove it from the api.js signature or document why it is hidden.