The NANO MCP Server has a complete set of 17 tools with schemas and descriptions, but exhibits significant quality gaps. Naming is mostly verb-based (generateWallet, getBalance, sendTransaction), which is good. However, descriptions are often too brief (average ~80 chars, below the 194 char baseline) and lack sufficient context for LLM tool selection. Most parameters have type definitions and descriptions, which is positive, but many descriptions are minimal (e.g., 'NANO address to check balance for' without format hints or when to use the tool). Error handling is present in the TypeScript type definitions (ErrorResponse with errorCode, details, nextSteps, relatedFunctions) but it's unclear if this error schema is actually implemented in the server code. Output schemas are documented in the TypeScript definitions but not fully visible in the server.js source. The test wallets feature (tools 10-14) represents a composition issue: these are utilities mixed into the main tool set rather than separated into a testing harness. Tool 1 (initialize) is a red flag, the description says 'Initialize the MCP server and get available capabilities', but this overlaps with what the MCP protocol itself should handle and doesn't appear to be a stateful operation.

• Separate test utilities (setupTestWallets, getTestWallets, updateTestWalletBalance, checkTestWalletsFunding, resetTestWallets) into a separate testing-only MCP server or endpoint; keep main API clean.
• Expand tool descriptions from average ~65 chars to 120 - 200 chars. Include WHEN/WHY context. Example: 'Check the balance of a NANO address to determine available funds before sending a transaction. Use this before sendTransaction to validate the sender has enough balance. Returns balance in both raw units and decimal NANO.'
• Consolidate getBalance, getAccountInfo, and getAccountStatus. Choose one canonical tool with all necessary fields, or clearly partition: getBalance for balance+pending only, getAccountInfo for blockchain metadata only. Update descriptions to explain the distinction.
• Add confirmation/dry-run support for sendTransaction. Implement a pattern where agents can call sendTransaction with a 'dryRun: true' parameter to simulate without broadcasting. Return 'input_required' if confirmation is needed.
• Document output schemas for all tools directly in the tool definition (not just in separate TypeScript files). Specify what fields are returned and their types.
• Move amountRaw conversion logic into the tool. Accept user-friendly decimal NANO amounts (e.g., '0.5') and internally convert to raw units. If raw units are required, add a 'amountUnit: enum[nano|raw]' parameter and document the conversion factor (1 NANO = 10^30 raw).
• Implement structured error responses. Every error should include: errorCode (enum), message (human-readable), details (specific values), nextSteps (array of actionable recovery steps). Example: 'Insufficient balance. You have 0.1 NANO but need 0.5 NANO. Try receiveAllPending() to collect pending blocks.'