get_rent_estimate

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It adds important context about potential API limitations based on subscription tier, which helps set expectations. However, it doesn't cover other behavioral aspects like response format, error conditions, authentication needs, or rate limits, leaving significant gaps for a tool with no annotation support.

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 perfectly concise and well-structured: a clear purpose statement followed by an important caveat. Both sentences earn their place by providing essential information without any wasted words 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?

Given the tool's moderate complexity (single parameter, no output schema, no annotations), the description provides adequate but incomplete coverage. It explains the core purpose and a key limitation, but doesn't address what the return value looks like, error handling, or how to interpret results. For a tool that fetches estimates, more guidance on output expectations would be helpful.

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 description mentions 'for a specific property' which implies the need for a property identifier, but doesn't explicitly reference the 'property_id' parameter or provide any semantic context beyond what's obvious from the parameter name. With 0% schema description coverage and 1 parameter, the description adds minimal value over the bare schema.

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 the tool's purpose: 'Get rent estimate for a specific property.' It specifies the verb ('Get'), resource ('rent estimate'), and scope ('for a specific property'). However, it doesn't explicitly differentiate from sibling tools like 'get_property_valuation' or 'get_property_data', which might also provide related property information.

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 provides implied usage guidance through the note about API limitations: 'RentCast API may return basic property data instead of detailed rent estimates depending on subscription tier.' This suggests when the tool might not be fully effective, but it doesn't explicitly state when to use this tool versus alternatives like 'get_property_valuation' or provide clear prerequisites.

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