MCP SysOperator

aws_s3

Manage AWS S3 buckets and objects by listing, creating, deleting, uploading, and downloading files through the MCP SysOperator server.

Instructions

Manage AWS S3 buckets and objects

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": {
      "action": "<action>",
      "region": "<region>"
    },
    "name": "aws_s3"
  }
}

Input Schema

Name	Required	Description	Default
`action`	Yes
`region`	Yes
`bucket`	No
`objectKey`	No
`localPath`	No
`acl`	No
`tags`	No
`metadata`	No
`contentType`	No

Schema Changelog

Changes observed during successful MCP inspections.

First observedJan 30, 2026

TDQS

C2.1/5.0

Behavior1/5

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

No annotations are provided, so the description carries full burden for behavioral disclosure. 'Manage' implies both read and write operations, but it doesn't specify destructive actions (e.g., delete_bucket), authentication requirements, rate limits, error handling, or response formats. For a multi-action tool with potential mutations, this lack of detail is inadequate and fails to inform the agent about critical behavioral traits.

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 with a single phrase, 'Manage AWS S3 buckets and objects', which is front-loaded and wastes no words. It efficiently states the domain and high-level purpose without unnecessary elaboration, making it easy to parse quickly.

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

Completeness1/5

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

Given high complexity (9 parameters, multiple actions including mutations, no annotations, no output schema), the description is severely incomplete. It doesn't cover behavioral aspects, parameter meanings, usage contexts, or return values. For a tool that handles diverse S3 operations, this minimal description fails to provide the necessary context for an agent to use it effectively.

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

Parameters1/5

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

Schema description coverage is 0%, meaning no parameters are documented in the schema. The description adds no parameter semantics beyond the tool name—it doesn't explain what 'action', 'bucket', 'objectKey', or other parameters mean, their relationships, or how they map to S3 operations. With 9 parameters and zero coverage, the description fails to compensate, leaving parameters largely unexplained.

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

Purpose3/5

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

The description 'Manage AWS S3 buckets and objects' states the general domain (AWS S3) and high-level purpose (manage), but it's vague about what specific actions are available. It doesn't specify verbs like list, create, delete, upload, or download, which are revealed in the action parameter enum. It distinguishes from siblings by mentioning S3 specifically, but lacks precision about the tool's functional scope.

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. It doesn't mention prerequisites (e.g., AWS credentials), differentiate from other AWS tools (e.g., aws_ec2 for compute), or specify contexts like file operations versus bucket management. Usage is implied only by the tool name, with no explicit when/when-not statements or named alternatives.

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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