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 tool compares templates and returns differences, but does not explain what 'differences' entail (e.g., structural changes, metadata), whether it's a read-only operation, potential side effects, or error conditions. This leaves significant gaps for a tool with 3 parameters and no annotation coverage.

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 front-loaded with the core purpose in the first sentence, followed by structured sections for Args and Returns. It avoids unnecessary verbosity, but the Args section could be more integrated into the flow. Overall, it's efficient with minimal waste.

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 moderate complexity (3 parameters, no annotations, but has an output schema), the description is partially complete. It covers the basic purpose and parameters superficially, but lacks behavioral details, usage context, and deeper parameter explanations. The output schema existence means return values are documented elsewhere, but the description does not fully compensate for other gaps.

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 schema provides no parameter details. The description adds minimal semantics by listing parameter names and noting 'Optional user ID (admin only)' for user_id, which clarifies its optionality and access restriction. However, it does not explain what template IDs are, their format, or how they should be obtained, leaving two required parameters poorly defined.

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: 'Compare two templates and show differences.' It specifies the verb ('compare') and resource ('templates'), making the action explicit. However, it does not distinguish this tool from sibling tools like 'validate_template' or 'get_template_dependencies', which might involve template analysis, so it misses full differentiation.

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 lacks context such as prerequisites (e.g., templates must exist), when-not-to-use scenarios (e.g., for single template validation), or explicit sibling tool comparisons. The mention of 'admin only' for user_id is a parameter detail, not usage guidance.

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