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 'periodic updates' and returns 'progress information', but fails to disclose critical behaviors: whether this is a blocking or non-blocking operation, if it requires admin permissions (implied by 'admin only' in args but not stated in description), error handling, or rate limits. This is inadequate for a monitoring tool with potential long-running or privileged operations.

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 a clear purpose statement followed by Args and Returns sections. It's concise with no redundant sentences. However, the 'Args' and 'Returns' labels are somewhat informal and could be integrated more smoothly, slightly affecting readability.

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 3 parameters with 0% schema coverage and no annotations, the description partially compensates by listing parameters and mentioning an output schema exists. However, it lacks details on behavioral traits, error conditions, and operational context. The output schema helps, but the description should do more to explain the monitoring process and constraints.

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 lists all three parameters with brief explanations (e.g., 'Optional user ID (admin only)'), adding meaning beyond the bare schema. However, it doesn't detail format constraints, valid ranges for numeric parameters, or interaction effects, leaving gaps in understanding.

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: 'Monitor deployment progress with periodic updates.' It specifies the verb ('monitor') and resource ('deployment progress'), making it understandable. However, it doesn't explicitly differentiate from sibling tools like 'get_deployment_status' or 'deployment_timeline', which might offer similar monitoring functions, preventing a perfect score.

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 'periodic updates' but doesn't specify scenarios, prerequisites, or exclusions. With many sibling tools related to deployment and monitoring, this lack of context leaves the agent without clear usage instructions.

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