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

Annotations already declare readOnly/idempotent/non-destructive semantics, so the bar is lower. The description adds genuine operational context beyond the annotations: the /mcp?toolset=<name>[,<name>] or toolset=all connection pattern and the client-side limitation that only enumerated tools are visible.

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?

Three tight sentences that front-load the purpose before the connection mechanics and the rationale. Every sentence contributes, though the middle connection sentence is slightly tangential to invoking the tool itself.

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?

With an output schema present, return values need not be described, and with zero parameters the description carries little structural burden. It supplies enough context for an agent to know this is a discovery step and how to act on it.

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 tool takes zero parameters, so the baseline is 4. The schema is empty and fully covered; the URL toolset syntax referenced is not a tool parameter, so no additional parameter meaning is required.

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 states the resource being listed ('the toolsets this server offers and the tools in each'), which is clear and specific. It does not explicitly differentiate itself from siblings like start_here, but its discovery/meta role is distinguishable from the rights and license tools.

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?

It gives clear context for when to reach for this tool: because clients only expose the tools they initially listed, the agent should connect with the toolset its task needs. No explicit exclusions against siblings are offered, which keeps it at a 4 rather than a 5.

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