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

With no annotations, the description discloses important behavior: responses differ with an API key (full pricing/certifications vs summary/flag), and contact details are only on the listing page via listing_url. It does not mention error/not-found cases, but the auth-dependent behavior and data exclusions are transparent.

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 sentences: purpose, return fields, and auth-dependent behavior. Each sentence earns its place, though the field list in sentence two is slightly dense. It is front-loaded with the main verb and object.

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?

The description fully explains return values, API key variations, and where to find contact details, which substitutes for the missing output schema. For a read tool with two parameters, this is a complete self-contained description.

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 describes both parameters with examples and 100% coverage. The description adds no extra parameter semantics, so the baseline score of 3 applies.

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 ('Get') and resource ('a specific verified service provider'), clearly indicating a single-provider lookup. It distinguishes itself from sibling tools like search_providers by emphasizing specificity and detail.

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 word 'specific' implies this tool is used after identifying a provider (e.g., via search_providers), and the schema reinforces matching niche_id. However, the description does not explicitly name alternatives or state 'use this instead of search_providers', so it is clear but not fully explicit.

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