get_all_bills

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

With no annotations, the description carries the behavioral disclosure burden. It explicitly states that amounts are in paise, lists the cost components (food, extras, infrastructure), and notes the api_key fallback to MESS_API_KEY. It does not mention pagination/ordering, but 'Return' indicates a non-mutating read and the output schema can cover 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?

Three compact, front-loaded sentences cover capability, output units, and argument behavior with no filler or repetition.

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 read-only retrieval with a single optional parameter and an output schema, the description is nearly complete. A minor gap is not clarifying whether this returns all users' bills or only the authenticated user's bills, which could affect selection.

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 coverage is 0%, but the description fully documents the only parameter: api_key, including its environment-variable fallback. This adds practical semantics beyond the schema's bare type/default.

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 opens with a specific verb ('Return') and a concrete object ('full historical breakdown of mess bills across all recorded months'). It clearly distinguishes this from sibling get_monthly_bill by emphasizing all months rather than a single monthly bill.

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 'across all recorded months' and 'full historical breakdown' imply this is the correct tool for broad historical/bulk bill retrieval. It does not explicitly name alternatives or exclusion conditions (e.g., 'use get_monthly_bill for a single month'), so it stops short of a 5.

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