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

Annotations already declare this a read-only, non-destructive, closed-world call, so the safety profile is covered. The description adds useful behavior (descending order, resolved payee names, single-lens scoping) but says nothing about result limits, pagination, or how 'lens' is chosen.

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?

A single front-loaded sentence with no filler; the ordering and name-resolution details are packed efficiently. The vague 'within one lens' phrase is the only weak point.

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?

An output schema and annotations reduce the burden, but for a spend-analytics tool with 4 parameters and 25% schema coverage, the description omits too much: date-range semantics, the meaning of the category lens, and defaults or limits.

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 low (25%) and only companyId carries a terse wrapper description. The description does not explain the dateFrom/dateTo behavior or what the category enum lens means, so it fails to compensate for undocumented parameters.

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 verb and resource: lists payees a company has paid, ranked largest first, with resolved counterparty names. The phrase 'within one lens' is vague, but the paid-vs-received distinction separates it reasonably from spend_get_income_by_payer.

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?

No when-to-use or when-not guidance is given, and no sibling is named. An agent cannot tell from this text whether to choose it over get_spending_by_category, spend_get_income_by_payer, or read_agent_spend.

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