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

With no annotations, the description carries the burden. It clearly discloses that no allocation or payment occurs, which reassures about side effects. However, it does not describe validation outcomes, errors, or whether it involves any persistent state changes beyond the explicit non-execution.

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 concise sentences, front-loaded with the primary purpose and followed by a key non-side-effect. No wasted words, easy to scan.

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?

Given a nested object parameter, no annotations, and no output schema, the description is somewhat thin. It explains the core purpose but lacks details on return values, error behavior, or how the validation result is presented, which would be important for a validation tool.

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 has 0% description coverage for the 'payload' parameter. The description adds that it is a 'portfolio payload', giving some context, but does not explain structure, required fields, or validation rules. This is minimal compensation for an undocumented nested object.

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 uses a specific verb ('Validate') and resource ('portfolio payload'), and explicitly distinguishes from purchasing by stating 'This does not execute the allocation or charge a payment.' This clearly differentiates it from the sibling purchase_promotion_allocation and other related 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?

The phrase 'before purchasing' gives clear usage context, and the statement that it does not execute or charge implies when not to use it (if you want execution). It does not explicitly name alternatives, but the sibling tool names are visible and the context is sufficient.

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