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

There are no annotations, so the description carries the full burden of behavioral disclosure. It does disclose return fields and geographic coverage, but it does not explicitly state that this is a read-only operation, how results behave when city is omitted, or any error/limit conditions. This is adequate but not rich.

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 front-loaded with the action and resource, then efficiently packs categories, return fields, coverage, and prerequisites into four sentences. The category list is lengthy but necessary because it defines what niche_id values are valid.

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 search tool with four parameters and no output schema, the description covers required inputs, sources for valid values, result fields, and geographic scope. It could more explicitly state when to use get_provider for full profile/contact details, but the profile link implies that next step.

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 input schema already documents all four parameters with examples and defaults, so the baseline is 3. The description adds value by listing the trade categories and explicitly directing the agent to list_niches and list_service_types for valid values, going beyond the schema's descriptions.

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 ('Search') with a clear resource ('verified local service providers') and enumerates 10 trade categories. This clearly distinguishes it from sibling tools like get_provider, which fetches a single provider, and list_niches/list_service_types, which return reference data.

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 explicitly instructs the agent to use list_niches first for valid niche IDs and list_service_types for valid service_type values, giving clear prerequisite guidance. It also notes coverage of major US metro areas, but it does not explicitly say when to prefer get_provider over search_providers or state exclusions.

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