The server defines 2 tools with explicit schemas and descriptions. Both tools have well-structured input parameters with types and descriptions, meeting the baseline for a functional MCP server. However, there are significant gaps in output documentation, error handling guidance, and parameter validation that prevent a higher score. The tool names are clear and action-oriented (getPrice, executeSwap), and parameter descriptions include context about chain IDs and token address formats. The main issues are: (1) no documented output schema for either tool, callers cannot know what fields to expect; (2) missing error handling guidance that would help LLMs recover from failures; (3) no confirmation/dry-run pattern for the irreversible executeSwap tool; (4) parameters lack explicit constraints (e.g., chainId enum values, slippageTolerance min/max bounds); (5) the amountIn/amountOut parameters are optional but their mutual exclusivity and relationship to tradeType is not clearly stated in descriptions.

• Add explicit output schema documentation for both tools. Document the JSON structure returned by each, including field types (price: string, inputAmount: string, outputAmount: string, route: array, etc.), which fields are always present, and any optional fields.
• Implement structured error responses with recovery guidance. Instead of 'No route found', return: {error: 'NO_ROUTE_FOUND', message: 'No liquidity path exists between these tokens on this chain', retryable: false, suggestions: ['Check token addresses', 'Try a different token pair']}.
• Add a confirmSwap or previewSwap step before executeSwap. Return estimated output and gas costs, ask for user/agent confirmation before on-chain execution. This prevents accidental loss of funds.
• Convert chainId to a constrained enum in the schema (e.g., z.enum(['1', '10', '137', '42161', '42220', '56', '43114', '8453']).or(z.number())) and enforce at the tool level. Add min/max constraints: slippageTolerance (0.01 - 50), deadline (1 - 1440).
• Explicitly document amountIn/amountOut mutual exclusivity in both parameter descriptions. Better: split into separate tools (getPriceExactIn, getPriceExactOut) to eliminate ambiguity, or add runtime validation that rejects calls with both or neither parameter set.
• Enhance getPrice description to state: 'Returns a quote with execution price, input/output amounts, and the multi-hop route. Use this to preview a swap before calling executeSwap.' Include context on when to call it.
• Wrap token address resolution (createToken function) and balance checks into explicit pre-execution validation, and return clear error messages like 'Token USDC not found on chain 1' or 'Wallet balance is 0, fund the wallet at 0x123...'.