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

Annotations already declare readOnlyHint=true, openWorldHint=true, and destructiveHint=false, so safety is covered. The description adds useful context about data granularity ('hour by hour') and provenance ('open sources'), but does not mention coverage, pagination, or what the returned list contains.

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 a single sentence with no wasted filler and the resource is front-loaded. The second clause is ambiguous, but the overall form is concise.

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 the description is minimally adequate: it identifies the data theme and source type. It falls short by suggesting event- and source-specific behavior that the tool cannot accept parameters for, and by not clarifying its relationship to the dedicated sibling tools.

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 has zero parameters, so the baseline is 4. No parameter-level semantics are needed, and the schema is trivially complete.

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 identifies the resource ('Major disasters told hour by hour from open sources') but does not state a clear action or scope. It confusingly claims to support 'the list, one event, or its sources' even though sibling tools cell_data_disasters_event and cell_data_disasters_sources exist for event/source access.

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?

No explicit guidance on when to use this tool versus its siblings. The phrase 'the list, one event, or its sources' implies overlapping capabilities without saying which tool to choose for each case, leaving the agent to infer.

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