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. It mentions that user_id is 'admin only,' which adds useful context about authorization needs. However, it lacks details on behavioral traits such as whether validation is read-only, what happens on failure, or any rate limits, leaving gaps in transparency.

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 appropriately sized and front-loaded with the main purpose, followed by structured Args and Returns sections. It avoids unnecessary fluff, but the formatting with separate sections could be slightly more integrated for optimal flow.

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 complexity (validation with nested objects), no annotations, and an output schema present (implied by 'Returns'), the description is reasonably complete. It covers the purpose, parameters, and return value, though it could benefit from more behavioral context to fully compensate for the lack of annotations.

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?

Schema description coverage is 0%, so the description must compensate. It explains that 'template_config' is the 'Template configuration to validate' and 'user_id' is 'Optional user ID (admin only),' adding meaning beyond the bare schema. However, it does not fully detail the structure or format of template_config or the implications of user_id, resulting in only partial compensation.

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 as 'Validate a template configuration,' which is a specific verb+resource combination. However, it does not explicitly distinguish this tool from its sibling 'validate_config' or other validation-related tools in the list, which would be needed for a score of 5.

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 like 'validate_config' or other validation methods. It mentions 'admin only' for the user_id parameter, but this is a parameter detail rather than usage context, so it does not constitute explicit when/when-not guidance.

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