Magma MCP has a single tool 'buy_lightning_liquidity' with clear naming, comprehensive description, and well-structured input schema. The tool name starts with a verb ('buy') and clearly indicates the action. The description is detailed (387 chars, within baseline range of 34-392), explaining what the tool does, when to use it, and including use cases. All five parameters are typed and have descriptions. However, the tool lacks output schema documentation, the description mentions 'Returns: lightning_invoice' but the actual output structure is not formally documented in the code. Error handling returns structured JSON but lacks recovery guidance beyond a generic 'Tool execution failed' message. The tool follows most patterns but falls short of A-grade due to missing output schema and limited error recovery context.

• Add formal output schema documentation: define the response object structure, including 'lightning_invoice' field type (string), any metadata (expiration, amount_satoshis, etc.), and example response JSON in comments or a return type annotation.
• Enhance error handling to categorize failures: return structured errors with 'code' (INVALID_INPUT, INSUFFICIENT_BALANCE, NETWORK_ERROR, TRANSACTION_PENDING), 'message', and 'recovery_hint'. Example: { code: 'INSUFFICIENT_BALANCE', message: 'Account balance too low', recovery_hint: 'Top up account or reduce requested liquidity amount' }.
• Implement a two-step workflow: add a 'preview_buy_liquidity' tool that validates parameters and returns estimated fees/timing without committing, or add an 'confirmPurchase' step to the existing tool that returns a confirmation token the agent must pass back to execute.
• Document the actual JSON Schema being registered. Replace the Zod inline schema with explicit JSON Schema objects or add a schema export that shows what the SDK generates. This ensures clarity for clients and LLMs inspecting the server.
• Add pagination and batch handling if the API supports listing orders or checking account status. Currently, the single tool is narrowly scoped to purchase; adding 'get_account_balance', 'list_pending_orders', or 'get_channel_status' would enable agents to validate preconditions before purchase.
• Specify timeout and retry behavior in the tool description. Lightning Network and payment operations can be slow, document expected latency and whether the agent should expect the invoice to be created synchronously or asynchronously.

Inferred effective spec: <=2025-11-25.

• Relies on Logging (deprecated) - log to stderr or use OpenTelemetry