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

With no annotations, the description carries full responsibility for disclosing behavior. It mentions the data fields (announcement dates, EPS) but does not state that the tool is read-only, how it handles missing from/to parameters, pagination, rate limits, or authentication. This leaves significant gaps for an agent evaluating safety and side effects.

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 compact at two sentences and front-loaded with the purpose. The opening phrase 'Stay informed' is somewhat marketing-oriented but not distracting. It avoids redundancy with the schema, making it efficient, though the 'Access key data' phrase is slightly 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 simple tool with two optional parameters and no output schema, the description provides a basic idea of the return data but does not explain the response structure (e.g., a list of announcements), default behavior when dates are omitted, or how to interpret the fields beyond naming them. It is adequate but leaves several gaps an agent might need to fill.

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 100%, so the parameters are fully documented in the schema. The description adds minimal extra meaning—only implicitly suggesting that the date range filters announcements. It does not clarify defaults or whether both parameters are required, but since the schema already covers syntax, a baseline of 3 is appropriate.

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 identifies the tool as an earnings calendar API that provides announcement dates, estimated EPS, and actual EPS. It specifically mentions 'upcoming and past earnings announcements,' which gives it a defined scope. However, it does not explicitly differentiate from sibling tools like getEarningsReports or getEarningsSurprisesBulk, so it misses the highest mark.

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 guidance is provided on when to use this tool versus alternatives. The phrase 'Stay informed' is a generic use case, but there is no mention of date-range requirements, prerequisites, or scenarios where another tool would be more appropriate. The from/to parameters are noted only in the schema, not in the description.

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