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

Annotations already declare readOnlyHint and openWorldHint, and the description adds meaningful behavioral context beyond that: the data source is a 'live block sample plus explorer stats,' and nulls are returned when a leg is unavailable. This helps the agent interpret data quality and availability without contradicting the annotations.

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 tight and efficiently structured: it opens with the core purpose, lists the returned data points, then states the source and a null-handling caveat. Every sentence earns its place and there is no filler.

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 read-only tool with no output schema, the description is complete: it names all observable return values, states the data source, and discloses unavailable-data behavior. An agent can decide to call it and correctly interpret the result without additional information.

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 input schema has zero parameters and the description has no parameter documentation to add, so the baseline of 4 applies. The description instead usefully clarifies what the returned metrics mean, which is appropriate for a parameterless tool.

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 a specific verb ('Return') and resource ('live Flare C-chain activity') and enumerates the exact metrics provided. It does not explicitly name a sibling to differentiate from, so it falls just short of a 5, especially given the presence of related status tools like get_network_status.

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 gives no explicit guidance on when to use this tool versus alternatives such as get_network_status or get_network_economics. The intended use is implied by the 'live activity' wording, but there is no stated context or exclusions, so the agent must infer when this tool is the right choice.

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