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

Annotations declare readOnlyHint=true, so the safety profile is covered. The description adds useful return-shape context (one row per report line with balances) but omits pagination behavior, authentication needs, and any caveats about the POST endpoint used for a read.

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 front-loaded sentence that states purpose first and parameter behavior second. The trailing POST endpoint is arguably redundant implementation detail, but the overall statement is efficient with no wasted prose.

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 two-parameter report tool with no output schema, the description adequately conveys what will be returned and how the period parameters interact. It does not cover pagination or response format details, but the core need for correct invocation is met.

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 both parameters are fully documented in the schema. The description reinforces that per_count counts months back from end_date, adding a bit of relationship context but nothing the schema does not already provide.

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 names the specific resource (balance sheet) and describes the return shape: one row per report line covering assets, liabilities, and equity. It does not explicitly differentiate from the closest sibling, merit_income_statement, but the stated line items make the distinction inferable.

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?

There is no when-to-use guidance, no mention of alternatives such as merit_income_statement, and no prerequisites or exclusions. The usage is only implied by the tool name and report content.

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