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schwarztim

Rubeus MCP Server

by schwarztim

rubeus_triage

Summarize Kerberos tickets in active sessions to identify available credentials for reconnaissance without full extraction.

Instructions

Display a quick summary of all tickets in current/all sessions.

Shows ticket information without full extraction - useful for reconnaissance of what tickets are available.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
luidNoTarget specific LUID
userNoFilter by username
serviceNoFilter by service name
serverNoFilter by server name
Behavior3/5

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

With no annotations, the description carries full burden. It states 'without full extraction', indicating a non-destructive, lightweight operation. However, it does not disclose other behavioral traits such as whether it modifies state, permissions required, or side effects.

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 two sentences, front-loaded with the primary action, and provides additional context in the second sentence. Every word earns its place with no fluff or redundancy.

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?

Given the tool is simple (4 optional params, no required, no output schema, read-only), the description covers the main action adequately. It could mention return format or behavior with no results, but overall it is fairly complete for a triage tool.

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 coverage is 100%, and each parameter has a basic description in the schema. The tool description adds no additional meaning beyond what is already in the schema, so a baseline score of 3 is appropriate.

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 it displays a quick summary of tickets in sessions, using specific verbs (display/show) and resource (tickets). It distinguishes from siblings like rubeus_dump by noting 'without full extraction', making the purpose unambiguous.

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 mentions 'useful for reconnaissance', which implies usage context, but it does not explicitly state when to use this tool versus siblings like rubeus_klist or rubeus_dump, nor does it provide when-not-to-use guidance.

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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