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Alchemy MCP Server

Alchemy MCP Server

Official
by alchemyplatform
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Remote

getBeaconBlock

Retrieve a Beacon Chain block by providing a slot number, block root, or keyword such as head, finalized, or genesis.

Instructions

Get a Beacon Chain block by slot number, root, or keyword (head, finalized, genesis)

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "blockId": "<blockId>"
    },
    "name": "getBeaconBlock"
  }
}

Input Schema

NameRequiredDescriptionDefault
networkNoNetwork ID. Call listSupportedNetworks for all options. e.g. "eth-mainnet", "base-mainnet"eth-mainnet
blockIdYesBlock ID: head, genesis, finalized, slot number, or 0x-prefixed block root

Schema Changelog

Changes observed during successful MCP inspections.

  1. Addedv0.1.5

TDQS

A4/5.0
Behavior3/5

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

No annotations are provided, so the description carries the full burden. It states the action but does not disclose behavior on error (e.g., if block not found), rate limits, or any side effects. The description is minimal and lacks transparency beyond the basic function.

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 sentence that conveys the essential information without any redundant words. It is front-loaded and efficient.

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

Completeness4/5

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

Given the simplicity of the tool (retrieving a block) and the lack of an output schema, the description is nearly complete. However, it could mention that the response includes block data (e.g., slot, root, body) to set expectations, but this is not critical.

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?

Schema description coverage is 100% as both parameters have descriptions in the input schema. The description does not add additional meaning beyond what the schema provides; it merely restates the blockId options. Thus, baseline score of 3 is appropriate.

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

Purpose5/5

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

The description clearly states the action 'Get' and the resource 'Beacon Chain block', with specific identifiers (slot number, root, or keywords). It distinguishes the tool from siblings like getBeaconBlockRewards and getBeaconBlockRoot by focusing on retrieving the full block object.

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

Usage Guidelines4/5

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

The description lists the valid identifiers (slot, root, keyword) but does not explicitly specify when to use this tool versus alternatives like getBeaconBlockRoot or getBeaconHeaderByBlockId. However, the purpose is clear enough for typical use cases.

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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