Single tool 'execute_skill_action' has a reasonable description (89 chars, within 10-1024 range) and three parameters with types and defaults. However, parameter descriptions are MISSING entirely, the schema shows only type, description field, and default value, but no actual description text for any parameter. Input schema is present but incomplete. No output schema is documented. The tool performs a complex M&A evaluation but lacks guidance on when to use it, what it returns, or how to interpret results. No error handling, no recovery guidance.

• Add description text to all three parameters. E.g., 'annual_revenue_jpy: Annual revenue in Japanese Yen (minimum 1,000,000, maximum 10,000,000,000). Used to calculate synergy savings and post-acquisition valuation.'
• Document the output schema with all fields, types, and meanings. E.g., 'Returns object with synergy_assessment_id (string), target_brand (string), shared_supply_chain_savings_jpy (number), cross_border_rakuten_amazon_expansion_score (number 0-100), projected_post_acquisition_ebitda_lift_pct (number), post_synergy_brand_valuation_jpy (number), m_and_a_due_diligence_cleared (boolean).'
• Rename tool to 'evaluate_brand_acquisition_synergy' or 'assess_m_and_a_due_diligence' to clearly signal the action and domain.
• Add min/max constraints to numeric parameters: annual_revenue_jpy (1000000 - 10000000000), gross_margin_pct (0 - 100).
• Define error responses: 'Invalid gross_margin_pct: must be 0 - 100. Got {value}.' and 'Insufficient data for evaluation: annual_revenue_jpy must be >= 1,000,000 JPY.'