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

With readOnlyHint already covering the safety profile, the description adds return-field details and the important cross-tool ID relationship. It does not mention pagination or auth needs, but these are lower-burden gaps given the annotations.

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?

Two very short, front-loaded fragments state the resource and fields first, then add the ID mapping and endpoint. Every sentence earns its place with no 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 zero-parameter list tool with no output schema and readOnlyHint already set, the description supplies the returned fields and explains how the id is used elsewhere. This is sufficient for an agent to call and use the result correctly.

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 parameter semantics are not applicable. The baseline for no parameters is 4, and the description does not introduce any misleading parameter behavior.

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?

States the resource (fiscal periods) and the returned fields (id, name, start, end, current flag), making the operation immediately identifiable. It also distinguishes its role by noting the id is the fiscal_period_id used by other tools.

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?

Does not explicitly say when to use this tool versus alternatives or name any sibling tool. However, the note that the id is the fiscal_period_id of other tools implies the intended usage: obtaining period IDs for downstream calls.

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