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Minecraft MCP Server

Minecraft MCP Server

by leo4life2
OverviewSchemaSourceRelated ServersDiscussionsAdmin
TypeScript
Hybrid

sendChat

Send chat messages or commands to the Minecraft MCP Server with optional delay. Use it to communicate, execute commands, or whisper to players directly from your AI agent.

Instructions

Send chat messages or commands to the server. Can send regular messages, commands (starting with /), or whispers.

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": {
      "message": "<message>"
    },
    "name": "sendChat"
  }
}

Input Schema

NameRequiredDescriptionDefault
delayNoOptional delay in milliseconds before sending (default: 0, max: 5000)
messageYesThe message or command to send (max 256 characters)

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.0.0

TDQS

B3.2/5.0
Behavior2/5

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

With no annotations provided, the description carries full burden but offers minimal behavioral disclosure. It mentions message types but doesn't cover critical aspects like permissions needed, rate limits, whether messages are public/private, or how the server processes commands. For a tool that interacts with a server, this leaves significant gaps in understanding its 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 extremely concise—a single sentence that efficiently covers the core functionality. Every word earns its place by specifying the action, target, and message types without redundancy or fluff.

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

Completeness2/5

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

Given the complexity of a server communication tool with no annotations and no output schema, the description is incomplete. It lacks details on behavioral traits (e.g., authentication, response handling), error conditions, or what happens after sending. This is inadequate for safe and effective use in an interactive environment.

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%, so the schema fully documents both parameters. The description adds no additional parameter semantics beyond what's in the schema (e.g., no examples of command syntax or whisper format). This meets the baseline for high schema coverage but doesn't enhance understanding.

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 tool's purpose: 'Send chat messages or commands to the server.' It specifies the verb ('send') and resource ('chat messages or commands'), and distinguishes between message types (regular messages, commands, whispers). However, it doesn't explicitly differentiate from sibling tools like 'readChat' beyond the obvious send/receive distinction.

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

Usage Guidelines3/5

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

The description implies usage context by mentioning 'regular messages, commands (starting with /), or whispers,' which suggests when to use different message types. However, it provides no explicit guidance on when to choose this tool over alternatives (e.g., no comparison to other communication tools) or any prerequisites for use.

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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