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

Annotations already establish the safe-read profile (readOnlyHint true, destructiveHint false, openWorldHint false), so the bar is lower. The description still adds real behavioral context: results are separated per currency and never mixed, all amounts are in cents, and the date range is capped at 1100 days. Those are non-obvious conventions an agent must know to interpret or request the report correctly.

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 report contents are front-loaded in one dense clause, followed by the interpretation constraints (currency, cents, range cap). Almost every phrase carries information and there is no filler, though the opening sentence is long and could be broken for scanability.

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?

With no output schema, the description carries the burden of describing the return value, and it does so thoroughly — the report's sections, grouping dimensions, and profitability metrics are all enumerated. Combined with the currency, units and range-cap notes, an agent has enough to call it and interpret the result without further discovery.

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 the baseline is 3. The description goes beyond the schema by supplying conventions that affect how from/to are used (1100-day maximum) and how returned values must be read (per-currency partitioning, cents). It adds no additional semantics for boardId/clientId, but the added conventions are materially useful.

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 a specific resource ("a studio's numbers for a date range") and enumerates the exact report contents — invoiced/collected by month, per-client owed amounts, expenses by project and category, project profitability. An agent knows precisely what comes back. It does not, however, differentiate itself from near-neighbour reporting siblings such as get_receivables_aging, get_time_report, or overview.

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 default window (last 12 months) and the 1100-day cap imply when the tool is appropriate, and the scope statement narrows its use to billing/financial rollups. But there is no explicit when-to-use versus alternatives, and no guidance on choosing between this and the other report/export tools that appear in the sibling list.

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