Single tool 'execute_skill_action' has a verb-noun name (positive), but the implementation is severely underdeveloped. The tool description is 127 characters, within acceptable range, but lacks critical detail on WHEN to use it, WHAT it returns, and HOW to interpret results. Input schema is present with three string parameters, each with descriptions, but lacks enums for the 'inquiry_channel' parameter (which lists specific values like 'VOICE_SMS_MULTIMODAL', 'WHATSAPP_AI_AGENT'). No output schema is documented anywhere in the source. The client.py mock returns a complex object with 7 fields (lease_inquiry_id, prospective_tenant, inquiry_channel, selected_unit, credit_income_prequalification_passed, self_guided_smart_lock_tour_booked_time, property_management_yardi_realpage_synced, leasing_conversion_rate_lift_pct), but this structure is never declared in the tool definition. No error handling, no recovery guidance, no validation rules. The mcp_server.py is a stub that only prints a JSON status message, it does not actually implement the MCP protocol or handle tool invocations. This is a proof-of-concept, not a production tool.

• Add a JSON Schema definition for the tool output documenting all 8 return fields: lease_inquiry_id (string), prospective_tenant (string), inquiry_channel (string), selected_unit (string), credit_income_prequalification_passed (boolean), self_guided_smart_lock_tour_booked_time (ISO 8601 datetime), property_management_yardi_realpage_synced (boolean), leasing_conversion_rate_lift_pct (number). Include this in the tool definition.
• Convert inquiry_channel from a free-form string to an enum with explicit values: ['VOICE_SMS_MULTIMODAL', 'WHATSAPP_AI_AGENT', ...]. List all valid channels in the parameter description.
• Expand tool description to 150-250 characters explaining: (1) What it does: 'Schedule property tours and qualify prospective tenants for lease eligibility'; (2) When to use it: 'Call when a prospective tenant inquires about a specific apartment unit'; (3) What it returns: 'A lease inquiry ID, qualification status, and tour booking confirmation.'
• Add error handling with actionable recovery messages. E.g., if qualification fails, return 'Tenant did not pass credit/income prequalification. Suggest alternative units or request additional documentation.' If unit is unavailable, return 'Unit Apt 4B - 2BR Luxury is not available. Available units: [list].'
• Implement the MCP protocol in mcp_server.py. Replace the stub with a proper STDIO server that: (1) reads JSON-RPC requests from stdin; (2) dispatches tool calls to the client; (3) returns structured responses with the documented output schema; (4) handles errors gracefully.