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robcerda

RentCast MCP Server

by robcerda

get_market_statistics

Retrieve real estate market statistics for specific ZIP codes to analyze property values, rent estimates, and market trends for informed decision-making.

Instructions

Get market statistics for a specific area.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
zip_codeYes
property_typeNo
bedroomsNo
Behavior2/5

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It only states the action ('Get') without details on permissions, rate limits, data freshness, or response format. This is inadequate for a tool with potential data retrieval implications.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single, efficient sentence with zero waste, front-loading the core purpose. It's appropriately sized for the tool's apparent simplicity, though this conciseness contributes to gaps in other dimensions.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given no annotations, no output schema, and low schema coverage, the description is incomplete. It doesn't clarify what 'market statistics' returns, how parameters interact, or behavioral traits, making it insufficient for reliable tool selection and invocation.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters2/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0%, and the description adds no parameter information beyond implying a 'specific area' (which loosely relates to 'zip_code'). It doesn't explain the meaning of 'property_type' or 'bedrooms' parameters, failing to compensate for the low schema coverage.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose3/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description states the tool 'Get market statistics for a specific area' which provides a clear verb ('Get') and resource ('market statistics'), but it's vague about what 'market statistics' entails (e.g., prices, trends, inventory) and doesn't distinguish it from sibling tools like 'get_property_valuation' or 'get_rent_estimate' that might overlap in purpose.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance is provided on when to use this tool versus alternatives. With siblings like 'get_property_valuation' and 'get_rent_estimate', the description lacks explicit context, prerequisites, or exclusions, leaving the agent to infer usage based on tool names alone.

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

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