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 implies a read-only lookup and hints at freshness ('current'), but does not state whether the schedule is cached or live, whether any auth is required, or what form the fee data takes. Adequate for a simple getter, but gaps remain.

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 with the core purpose and the pre-call timing front-loaded. The two trailing sibling pointers are slightly tangential to this tool's own use, but short and non-redundant.

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?

For a zero-parameter, presumably read-only getter with no output schema, the description covers what it returns and when to invoke it. Only the behavioral profile (auth, freshness, return shape) is unstated, which is a minor gap at this complexity.

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 there is nothing for the description to disambiguate; the baseline of 4 applies. No parameter-related information is missing or misleading.

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?

States a specific verb and resource ('Returns the current routing fee schedule'), which is unambiguous and clearly distinct from siblings like get_protocol_info and list_capabilities. An agent can identify the tool's output without opening any schema.

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?

Explicitly states when to call it ('before initiating a routing request to determine the expected cost') and routes adjacent needs to named alternatives ('For capability discovery, use list_capabilities. For protocol overview, use get_protocol_info'). Nothing is left to inference.

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