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schwarztim

Rubeus MCP Server

by schwarztim

rubeus_logonsession

Display details about current or specific Kerberos logon sessions on Windows systems.

Instructions

Display information about logon sessions.

Shows detailed information about the current or specified logon session.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
currentNoShow current session only
luidNoShow specific LUID
Behavior2/5

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

No annotations are present, and the description only states the tool displays information, implying a read-only behavior. It does not disclose any permissions needed, side effects, or output format, leaving significant gaps for an agent.

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

Conciseness4/5

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

The description is very concise, with two sentences that convey the core purpose. It is front-loaded and avoids unnecessary detail, making it easy to parse quickly.

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

Completeness3/5

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

For a simple tool with no required parameters and a clear purpose, the description is adequate. However, it could benefit from mentioning what information is displayed (e.g., user, domain, logon type) given the tool's security context and lack of output schema.

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%, so the parameters are well-defined in the schema. The description adds the context of 'current or specified logon session', which aligns with the parameters but does not provide additional semantic depth beyond what the schema already offers.

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 it displays information about logon sessions, with options for current or specified sessions. It distinguishes from sibling tools that perform actions like 'ask', 'dump', or 'golden', but does not explicitly differentiate beyond the core action of displaying.

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 is provided on when to use this tool versus alternatives. The sibling tools cover many related Kerberos operations, but no context is given for when 'rubeus_logonsession' is appropriate.

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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