Ludus FastMCP

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

With no annotations provided, the description carries full burden for behavioral disclosure. It mentions actions like 'create, update, delete' but fails to detail permissions (e.g., admin requirements beyond user_id note), side effects (e.g., data persistence), rate limits, or error handling. This leaves significant gaps for a mutation-heavy tool.

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 with sections for Args and Returns, and each sentence adds value without redundancy. It could be slightly more front-loaded by stating the core purpose more prominently, but overall it's efficient and easy to parse.

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 (5 parameters, mutation actions) and lack of annotations, the description is moderately complete. It covers parameters and returns but misses behavioral details like authentication needs or error cases. The presence of an output schema helps, but more context is needed for safe and effective use.

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 adds substantial value by explaining each parameter's purpose and usage context (e.g., 'webhook_url (for create/update)', 'user_id (admin only)'), clarifying semantics beyond the bare schema. However, it doesn't specify formats (e.g., URL validation, event types) or constraints, preventing a perfect score.

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 'Manage webhook integrations' with specific actions (create, update, delete, list, test), making the verb+resource explicit. However, it doesn't distinguish this tool from sibling tools (none appear to be webhook-related), so it misses the highest score for sibling 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, prerequisites, or exclusions. It lists actions and parameters but offers no context about appropriate scenarios or comparisons with other tools, resulting in minimal usage direction.

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