Ludus FastMCP

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It states the return format ('Ansible inventory in INI format'), which is useful, but lacks critical details: it doesn't specify if this is a read-only operation (implied by 'Get' but not explicit), whether it requires authentication, any rate limits, or error conditions. For a tool with zero annotation coverage, this leaves significant gaps in understanding its behavior.

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

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

The description is well-structured and concise, with a clear purpose statement followed by Args and Returns sections. Every sentence earns its place by providing essential information without fluff. It could be slightly more front-loaded by integrating the parameter note into the main description, but overall it's efficient.

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

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

Given the tool's low complexity (1 parameter, no nested objects) and the presence of an output schema (which likely details the INI format), the description is adequate but not complete. It covers the basic purpose and parameter semantics but lacks usage guidelines and full behavioral transparency. For a simple retrieval tool, this is minimally viable but leaves room for improvement in guiding the agent.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The description adds meaningful context for the single parameter: it explains that 'user_id' is optional and 'admin only', which clarifies access control beyond the schema's basic type information. With 0% schema description coverage, this compensates well, though it could specify what happens if user_id is omitted (e.g., defaults to current user or all users).

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool's purpose: 'Get Ansible inventory for the range.' It specifies the verb ('Get') and resource ('Ansible inventory for the range'), making it immediately understandable. However, it doesn't differentiate from sibling tools like 'get_range_config' or 'get_range_sshconfig', which also retrieve range-related data, so it misses full sibling distinction.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides no guidance on when to use this tool versus alternatives. It mentions 'admin only' for the user_id parameter, but this is a parameter constraint, not usage context. There's no indication of prerequisites, when this tool is appropriate, or what scenarios it's designed for compared to other 'get_range_*' tools.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.