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k9fr4n

thruk-mcp

by k9fr4n

thruk_root_cause

Analyze service storms to identify root cause hosts by tracing parent topology, helping you pinpoint the source of cascading failures.

Instructions

Collapse a DOWN/UNREACHABLE storm into its root cause(s) via parent topology.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
limitNoMaximum hosts scanned when building the parent topology map (default 5000).
sinceNoStart of analysis window. Thruk relative time ("-2h", "-7d") or ISO datetime ("2026-05-20 14:00:00"). Default: last 1 hour.-1h
untilNoEnd of the time window (same formats as since). Default: now.
filterNoStructured filter tree supporting AND/OR nesting. Two node types: leaf: {"type":"leaf", "field":"...", "op":"...", "value":...} group: {"type":"group", "operator":"and"|"or", "conditions":[...]} Available fields: custom_var, host, hostgroup Operators: eq, gte, in, lte, neq, regex Examples: # Objects in HG_AGILE: {"type":"leaf","field":"hostgroup","op":"eq","value":"HG_AGILE"} # In HG_AGILE OR with KERNEL=windows: {"type":"group","operator":"or","conditions":[ {"type":"leaf","field":"hostgroup","op":"eq","value":"HG_AGILE"}, {"type":"leaf","field":"custom_var","op":"eq","value":{"var":"KERNEL","val":"windows"}} ]}
backendsNoComma-separated backend names (sites). Omit for all backends.
sample_limitNoMaximum hosts listed per cluster in 'impacted_hosts' (default 50).
Behavior2/5

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

With no annotations, the description must disclose behavioral traits. It only states the core action but omits safety (read-only vs. mutation), return format, or side effects (like reading topology data). The phrase 'collapse' could imply data transformation or grouping, but it's not clarified.

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?

A single sentence that gets the point across without fluff. It is concise, though it could benefit from a second sentence to improve 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 6 parameters and no output schema, the description is insufficient. It fails to explain what 'collapse' means architecturally, what the output looks like (e.g., a list of root cause hosts), or how filtering interacts with the storm concept.

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%, so baseline 3 is appropriate. The description adds no parameter details beyond the name; the schema itself provides adequate descriptions for all 6 parameters.

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 a specific verb ('Collapse') and resource ('DOWN/UNREACHABLE storm') and method ('via parent topology'), clearly distinguishing it from other Thruk tools like thruk_problems or thruk_concurrent_failures.

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 vs alternatives. The description does not mention prerequisites, scenario, or exclude situations where other tools are better.

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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