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MinIO MCP Server

MinIO MCP Server

by Raphaelren
OverviewSchemaSourceRelated ServersDiscussionsAdmin
Python
Remote

minio_stat_object

Retrieve metadata for objects stored in MinIO or S3-compatible storage without downloading the actual content, enabling efficient object inspection and management.

Instructions

Get object metadata without downloading content

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": {
      "bucket_name": "<bucket_name>",
      "object_name": "<object_name>"
    },
    "name": "minio_stat_object"
  }
}

Input Schema

NameRequiredDescriptionDefault
bucket_nameYesName of the bucket
object_nameYesName of the object

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

A3.6/5.0
Behavior2/5

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 tool retrieves metadata but does not disclose behavioral traits such as required permissions, error handling (e.g., if object doesn't exist), rate limits, or what metadata fields are returned. This leaves significant gaps for a tool that interacts with storage.

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 is front-loaded with the core purpose. There is no wasted text, making it highly concise and well-structured for quick understanding.

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 no annotations and no output schema, the description is incomplete. It doesn't explain what metadata is returned, error conditions, or operational context (e.g., read-only nature, authentication needs). For a tool with two parameters and interaction with object storage, more detail is needed to guide effective use.

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%, with clear descriptions for both parameters (bucket_name and object_name). The description does not add meaning beyond the schema, as it doesn't specify parameter formats or constraints. Baseline 3 is appropriate since the schema adequately documents the parameters.

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 specific action ('Get object metadata') and resource ('object'), distinguishing it from siblings like minio_get_object (which downloads content) and minio_list_objects (which lists objects). It explicitly mentions 'without downloading content', which clarifies the scope.

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 implies usage for retrieving metadata only, not content, which differentiates it from minio_get_object. However, it lacks explicit guidance on when to use it versus alternatives like checking object existence or when metadata retrieval is preferred over full download.

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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