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mwnickerson

BloodHound MCP Server

by mwnickerson

get_gpo_tier_zeros

Identify Tier 0 groups linked to a specific GPO to discover high-privilege attack paths for lateral movement and privilege escalation in Active Directory security assessments.

Instructions

Retrieves the Tier 0 groups that are linked to a specific GPO in the domain.
Tier 0 groups are the highest privileged groups in the domain and have access to all resources.
This can be used to identify potential targets for lateral movement and privilege escalation.

Args:
    gpo_id: The ID of the GPO to query
    limit: Maximum number of Tier 0 groups to return (default: 100)
    skip: Number of Tier 0 groups to skip for pagination (default: 0)

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
gpo_idYes
limitNo
skipNo
Behavior3/5

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

With no annotations provided, the description carries full burden. It adequately describes the read-only nature ('Retrieves') and security implications, but lacks details on authentication requirements, rate limits, error conditions, or return format. The behavioral context is basic but not misleading.

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 well-structured with purpose first, followed by Tier 0 explanation, usage context, and parameter details. Each sentence adds value, though the security context sentence could be more integrated. Overall efficient with minimal waste.

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 3-parameter tool with no annotations and no output schema, the description provides adequate basics but lacks completeness. It covers purpose and parameters well, but misses details on return format, error handling, and deeper behavioral traits needed for full agent understanding.

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?

Schema description coverage is 0%, so the description must compensate. It provides clear semantic explanations for all three parameters: gpo_id identifies the target, limit controls result size with default, and skip enables pagination. This adds meaningful context beyond the bare schema.

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 the specific action ('Retrieves'), target resource ('Tier 0 groups linked to a specific GPO'), and domain context. It distinguishes this tool from siblings by focusing on GPO-linked Tier 0 groups rather than general GPO or group queries, with explicit explanation of Tier 0 significance.

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 usage for security analysis ('identify potential targets for lateral movement and privilege escalation'), providing some context. However, it doesn't explicitly state when to use this versus alternative tools like get_gpo_info or get_groups, nor does it mention prerequisites or exclusions.

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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