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

Annotations already declare readOnlyHint=true, so safety is covered and the description doesn't contradict it. The description adds that data can be scoped by fiscal period or date range, which is useful context, but says nothing about permission requirements, pagination, or result size.

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 compact sentences: the purpose first, then the endpoint. Nothing is wasted, though the endpoint path is arguably redundant operational detail that pushes the line count without adding selection value.

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 read tool with a fully documented schema and annotation-covered safety, the description is minimally adequate but omits the return shape and any routing guidance relative to the report-tree sibling, which is needed to call it correctly in a multi-step report workflow.

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% and the schema already documents start_date, end_date, fiscal_period_id, and their replacement relationship, so the description needn't document them. It adds only the notion of period vs. date range, which is already implied by the schema. Baseline 3.

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 states a specific verb and resource — retrieving the data of one report element, with concrete examples (balance sheet, income statement). It names the endpoint, but it does not differentiate from the sibling cashctrl_get_report_tree, which retrieves the element tree rather than the element's data.

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 explicit guidance on when to use this versus cashctrl_get_report_tree or the balance-specific tools. The only usage hint is indirect, via element_id's schema reference to the tree tool, so an agent must infer the workflow.

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