pex_get_bill

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

No annotations provided, so description carries full burden of behavioral disclosure. Beyond implying a read operation via 'Get', it reveals nothing about error handling (what if bill ID invalid?), data sensitivity, rate limits, or return structure.

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?

Extremely concise (6 words) and front-loaded with verb. Efficient for a simple tool, though given the rich sibling context with many bill-related endpoints, slightly more detail would improve clarity without sacrificing structure.

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 single-parameter retrieval tool without output schema, description minimally meets needs by identifying the returned resource type. However, gaps remain regarding behavioral traits and sibling differentiation that would be necessary for robust agent operation.

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 has 100% coverage (billId described as 'Bill ID'), establishing baseline of 3. Description mentions 'by bill ID' but adds no additional semantic detail like ID format, source, or constraints beyond what schema provides.

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?

Clear verb+resource+filter ('Get bill payment details by bill ID'), specifying exactly what resource is retrieved. However, it lacks differentiation from sibling tools like pex_get_bill_payments and pex_search_bills, which could confuse selection.

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 explicit guidance on when to use this versus pex_get_bill_payments (plural) or pex_search_bills. No mention of prerequisites like bill ID format or source.

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