Epinu MCP exhibits significant definition quality gaps. Tool names lack consistent verb-noun structure (e.g., 'initialize', 'tools/list', 'marketplace_listings_search' mix patterns). Descriptions are present but generic, most under 100 chars, lacking WHEN/WHY context. Input schemas visible in examples but incomplete: many parameters lack type constraints (e.g., 'status' in proposals_list_my has no enum). Output schemas are not documented. Error handling is minimal, no recovery guidance or actionable error messages. The 'initialize' tool is a protocol handshake, not a business tool, and should not be exposed as a callable tool. Tool composition is reasonable (search→fetch→propose chain), but parameter naming inconsistencies (query vs id) and missing field documentation weaken chaining.

• Remove 'initialize' from callable tools. It is a protocol handshake, not a business action. Agents should not invoke it.
• Document output schemas for all tools. Example: marketplace_listings_search returns {results: [{id, title, description, category, price, location}], total_count}. This enables agents to chain fetch() calls.
• Add enums to constrained parameters. marketplace_listing_create.pricing_mode should be enum ['quote', 'fixed']. proposals_list_my.status should be enum ['all', 'pending', 'approved', 'rejected'].
• Expand descriptions to 80 - 150 chars with WHEN/WHY. Example: 'Search marketplace listings by keyword. Use this for broad discovery; use projects_search() for internal projects only.'
• Add error recovery guidance. Example: 'If fetch() returns 404, the document may have been deleted. Call search() again to verify availability.'