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LimaCharlie MCP

by geoffbelknap

lc_get_ontology

Fetch LimaCharlie ontology and event definitions to understand security event schemas and structure. Optionally scope with an organization ID.

Instructions

Fetch LimaCharlie ontology/event definitions, optionally using oid as the org-key JWT scope.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
oidNo
limitNo
Behavior2/5

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

No annotations are provided, so the description should disclose behavioral traits. It minimally indicates a read operation ('fetch') and mentions a scope parameter, but does not explain default behavior, side effects, rate limits, or output format. This is insufficient.

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 a single sentence of 15 words, conveying essential information without any fluff. It is optimally concise.

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?

Given the lack of output schema, no annotations, and two parameters with zero description, the description is minimal. It tells what the tool does but lacks details about output, pagination, and the effect of limit. For a simple tool, it is adequate but has clear gaps.

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 0%, so the description must compensate. It explains that oid is used as an org-key JWT scope, adding meaning beyond the schema. However, it does not explain the limit parameter (integer, default 100) at all, so partial compensation.

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 action ('Fetch') and the resource ('LimaCharlie ontology/event definitions'). It also mentions the optional use of oid as a JWT scope, which distinguishes it from other 'get' tools.

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?

No explicit when-to-use or when-not-to-use guidance is given. The description implies usage for retrieving ontology definitions, but no alternatives are mentioned. The mention of oid scope gives a hint about authentication but is not a usage guideline.

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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