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kilkelly

Nano Currency MCP Server

by kilkelly

block_info

Retrieve detailed information about a specific Nano blockchain block by providing its hash, enabling precise data analysis and transaction verification.

Instructions

Retrieve detailed information about a specific Nano block.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
hashYesHash for the Nano block to get information about

Implementation Reference

  • The handler function that fetches block information via RPC call to 'block_info', processes the amount and balance with friendlyAmount, and returns a formatted text response. Handles errors appropriately.
    async function (parameters) {  
      try {
    
        let blockInfoJson = (
          await rpcCall(
            NANO_RPC_URL_KEY,
            'block_info',
            {
              json_block: 'true',
              hash: parameters.hash
            }
          )
        )        
    
        return createTextResponse(
          `The block information for hash ${parameters.hash} is ` +
          JSON.stringify({
            ...blockInfoJson,
            amount: blockInfoJson.amount ? friendlyAmount(blockInfoJson.amount) : 'N/A',
            balance: blockInfoJson.balance ? friendlyAmount(blockInfoJson.balance) : 'N/A'
          })
        )
      }
      catch (error) {
        console.error('[block_info] Error:', error.message || error);
        return createErrorResponse(error)
      }    
    }
  • Zod schema for the block_info tool parameters, validating the required 'hash' string parameter.
    const block_info_parameters = {
      hash: z.string({ required_error: 'Block hash is required' })
        .refine(hash_ => N.checkHash(hash_), { message: 'Block hash is not valid' })
        .describe("Hash for the Nano block to get information about")
    }
  • Registers the 'block_info' tool on the MCP server with its name, description, schema, and references the inline handler function.
    server.tool(
      'block_info',
      'Retrieve detailed information about a specific Nano block.',
      block_info_parameters,
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations provided, the description carries the full burden of behavioral disclosure. It states the action is to 'Retrieve' information, implying a read-only operation, but doesn't clarify aspects like authentication needs, rate limits, error handling, or what 'detailed information' entails. This leaves significant gaps in understanding the tool's behavior.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single, efficient sentence that directly states the tool's purpose without unnecessary words. It is front-loaded and appropriately sized, making it easy to parse and understand quickly.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the tool's low complexity (single parameter, no output schema, no annotations), the description is minimally adequate. However, it lacks details on return values or behavioral traits, which could be important for an AI agent to use it effectively, especially with no output schema to clarify results.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The input schema has 100% description coverage, with the 'hash' parameter clearly documented. The description adds no additional meaning beyond the schema, such as format examples or constraints, so it meets the baseline for high schema coverage without compensating value.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the verb 'Retrieve' and the resource 'detailed information about a specific Nano block', making the purpose evident. However, it doesn't explicitly differentiate from sibling tools like 'nano_account_info' or 'nano_my_account_info', which likely retrieve different types of information, so it misses full sibling distinction.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides no guidance on when to use this tool versus alternatives such as 'nano_account_info' or 'nano_send'. It lacks context about prerequisites, scenarios, or exclusions, leaving the agent with no usage direction beyond the basic purpose.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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