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frothkoetter

ranger-mcp-server

by frothkoetter

update_ranger_role

Modify an existing Apache Ranger role by providing its ID and a JSON object with the updated role definition. This write operation applies the changes to the role configuration.

Instructions

Update a Ranger role from JSON. WRITE OPERATION

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
role_idYes
role_jsonYes

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior2/5

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

Only highlights that it's a 'WRITE OPERATION' but lacks details on authorization, side effects (full replacement vs partial update), or response behavior. No annotations to supplement.

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

Conciseness2/5

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

The description is extremely concise but omits critical information. It is front-loaded with the bold note, but brevity sacrifices completeness.

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 presence of output schema and sibling tools, the description fails to explain the JSON format or the update behavior, leaving significant gaps for the agent to operate correctly.

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

Parameters2/5

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

The description mentions 'from JSON' but does not explain the expected structure of role_json or the role_id parameter. With 0% schema description coverage, the agent lacks essential guidance on parameter usage.

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 action 'Update' and the resource 'Ranger role', with 'from JSON' indicating the input format. It differentiates from siblings by resource type, though it could explicitly mention it applies to existing roles.

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?

No guidance on when to use this tool versus create_ranger_role or other update tools. No prerequisites or context about role existence are provided.

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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