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

Annotations already indicate this is a write operation with no destructive intent. The description adds that it works as a single transaction and applies an existing tax definition, but it does not disclose potential side effects such as overwriting existing tax assignments or partial failure 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?

The description is concise, uses only two sentences, and front-loads the core purpose. Every clause adds relevant information, with no filler or redundancy.

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 bulk update tool, the description provides sufficient context: what it does, what it applies to, and what it does not support. No output schema is present, so return-value details are not required, though a note on success/failure behavior could make it slightly more complete.

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 schema descriptions fully cover all three parameters with clear meanings. The tool description mostly restates the schema rather than adding new semantic detail, such as constraints on tax IDs or behavior when multiple entity IDs are invalid.

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 clearly states a specific action: applying one existing sales tax to several income or expense records in a single transaction. It also explicitly distinguishes this tool from invoice/bill line-item tax handling, making its purpose unambiguous.

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 description gives clear usage context by specifying that invoices/bills use line-item tax and are not supported here. It implies the appropriate alternative for those cases, though it does not explicitly name a sibling tool.

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