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

No annotations, so the description carries the full burden; it does disclose the read-only nature implicitly ("GET") and warns that the company must be passed explicitly rather than inferred. It stops short of describing what the closing state contains, whether it is scoped to a period, or any permission/error behavior.

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?

Four short, front-loaded sentences: endpoint, prerequisite, query shape with a pointer, and the required field. Every sentence carries information, though the 'Fixed JSON' phrasing is jargon that conveys little to an agent.

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?

The output schema is present, so return values need not be explained, and the description covers the endpoint identity, the company prerequisite, and the one required query field. For a two-parameter read tool this is sufficient for correct invocation.

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 coverage is 0%, so the description must compensate; it does name fiscalYearId as the required query field, which the schema leaves as an opaque additionalProperties object. It does not enumerate other accepted filters (deferring to describe_nextesy_operation) or explain the company_name format, leaving a partial gap.

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 a specific resource (fiscal-year closing state) and maps it to a concrete endpoint, but it never states in plain terms what the tool returns or what a 'closing state' is. Nothing distinguishes it from get_fiscal_year or list_fiscal_years, so an agent must infer the difference.

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?

'Explicit company required' is a genuine prerequisite, and pointing to describe_nextesy_operation for filters is useful routing. However, there is no guidance on when to prefer this over get_fiscal_year/list_fiscal_years, and no exclusions or failure conditions are given.

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