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schwarztim

Rubeus MCP Server

by schwarztim

rubeus_purge

Remove all Kerberos tickets from the current logon session, or from a specific LUID with elevated privileges.

Instructions

Purge Kerberos tickets from a logon session.

Removes all tickets from the current session, or with elevation, from a specific LUID.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
luidNoTarget LUID (requires elevation)
Behavior3/5

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

No annotations are provided, so the description must cover behavioral traits. It states that removing tickets requires elevation for a specific LUID, which discloses a requirement. However, it does not mention side effects (e.g., loss of authentication) or confirm destructive nature beyond the verb 'Purge'.

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?

Two sentences, each carrying essential information: the first states the action and resource, the second elaborates on the two scenarios. No redundant or extraneous text.

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?

For a simple tool with one optional parameter and no output schema, the description is fairly complete. It covers the core functionality, the two usage modes, and the elevation requirement. It lacks details about success indicators or error conditions, but these are minor given the tool's simplicity.

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

Parameters4/5

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

The schema covers 100% of parameters with a description for 'luid'. The description adds value by explaining the two modes (current session vs. elevated LUID), which goes beyond the schema's simple wording.

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 uses the specific verb 'Purge' and resource 'Kerberos tickets', clearly distinguishing it from sibling tools like rubeus_dump or rubeus_ptt. It specifies the scope: from a logon session, either current or specific LUID.

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 use for clearing Kerberos tickets but does not explicitly state when not to use it or mention alternative tools. No guidance on prerequisites or context is 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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