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

No annotations are provided, so the description carries the full burden. It thoroughly discloses auth-dependent behavior (with vs. without API key), lists exactly which fields are returned in each case, and clarifies that contact details are only available via listing_url. This goes well beyond the minimum and leaves little guesswork.

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 three sentences long, front-loaded with the main purpose, then detailing return fields and auth variations. Every sentence carries essential information with no filler or redundant phrasing. This is an exemplary model of conciseness.

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 there is no output schema, the description must explain return values itself. It does so comprehensively, covering business description, services, pricing details, coverage area, service details, listing link, and the auth-dependent extra fields. It also explains where to find contact details. This is fully complete for the tool's complexity.

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 provides 100% coverage with example values for niche_id and provider_slug. The description adds no extra parameter-level meaning beyond what the schema states. Thus, the baseline of 3 is appropriate since the schema fully documents the parameters.

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 function: 'Get a detailed summary of a specific verified service provider.' The verb 'Get' and resource are precise, and it distinctly differentiates from sibling tools like search_providers by emphasizing 'specific' vs. searching. It also enumerates what is returned, removing ambiguity.

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 does not explicitly state when to use this tool vs. alternatives, nor does it mention exclusions. It implies a prerequisite by referencing 'specific verified service provider,' but the direct guidance to use search_providers first comes only from the input schema, not the description itself. This is implied usage, not explicit.

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