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

The annotations already declare readOnlyHint=true and destructiveHint=false, so the agent knows the operation is safe. The description adds meaningful behavioral context by explaining that dates can be 'confirmed or still estimate', that print timing is indicated, and that EPS data can be consensus or reported with a beat/miss.

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 one substantial sentence plus two short instructive sentences, and it is front-loaded with the core purpose. It is reasonably concise and each sentence contributes meaningful information without unnecessary repetition.

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?

There is no output schema, but the description enumerates the expected return content: report date, confirmation status, pre/post timing, consensus EPS, and reported EPS with reward. The description is adequate for a relatively simple two-parameter read-only tool with no nested structures.

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 already provides full coverage of both parameters (symbol and limit), including example formats for symbol. The description adds no meaningful parameter detail beyond the schema's descriptions, so the baseline score 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 providing US mega-cap earnings dates and EPS, specifying the exact data fields covered: report date, confirmed/estimated status, pre/post market timing, consensus EPS, and reported EPS with beat/miss. This clearly distinguishes it from sibling market-data tools and makes the purpose obvious.

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 explicitly states this is 'the tool for any question about a company's earnings date or EPS' and gives a concrete usage example ('Pass symbol for one name, like AAPL'). It does not explicitly mention alternatives or when not to use it, but the usage context is clear enough.

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