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

Annotations already declare readOnly, idempotent, non-destructive, and closed-world, so the safety profile is covered. The description adds genuine value beyond them by enumerating what is returned (hours, response time, city-level trial availability) and clarifying that a prefilled WhatsApp message is not actually sent, which an agent needs to reassure users about.

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?

One front-loaded sentence whose colon-list enumerates the return payload, followed by a short read-only disclaimer. It is dense and slightly list-heavy but every clause earns its place; there is no filler or repetition.

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?

With no output schema, the description carries the burden of describing results and it does so thoroughly (channels, hours, response time, trial availability). What is missing is only minor: it does not say what happens when the city is unknown or omitted, nor how the topic changes the returned form URL versus other channels.

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?

Schema description coverage is 100%, with enums and per-value explanations already in the schema, so the baseline is 3. The description implies city-scoped trial availability and topic-driven contact routing, but adds no format, default, or interaction detail beyond what the schema already provides.

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?

States a specific verb-and-resource pair: retrieving Minairal's contact channels (phone, WhatsApp, email, form, hours, response time, trial availability). Nothing overlaps ambiguously with get_company_facts, list_locations, recommend_system, or search_content, so an agent can route here for contact information without opening a schema.

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 opening clause enumerates the user intents served (free trial, quote/site assessment, service, anything else), which maps directly to the topic enum and gives clear context for when to call. It stops short of naming exclusions or pointing to siblings for those adjacent cases, so it falls short of a 5.

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