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

Annotations already declare readOnlyHint=true, idempotentHint=true and destructiveHint=false. The description adds value beyond that by disclosing privacy behavior ('The link carries no personal data') and explicitly stating 'nothing is sent, booked or stored', which reassures the agent that no side effects occur. It does not discuss failure modes or the URL's lifecycle.

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 tight sentences with the gating condition front-loaded, followed by return content and the no-side-effects note. Every sentence carries information, though the read-only/link sentence partially overlaps the readOnlyHint annotation.

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 zero-required-parameter, read-only lookup with an output schema, the description covers what an agent needs: when to call it, what comes back, and that nothing is stored or transmitted. Return-value detail is rightly left to the output schema.

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%, and the single 'language' parameter is fully documented with its enum and default. The description's '(German or English)' only restates what the schema already conveys, so the baseline 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 states a specific verb and resource: it returns the URL of the GoodbyeMatrix consultation page plus the topics a call covers. That resource is clearly distinct from siblings such as request_cost_breakdown_link or get_program, so an agent can route without opening the 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?

It gives an explicit gating condition: 'Use only when the user explicitly asks to speak with GoodbyeMatrix.' That is a real when-to-use rule with an implied when-not (do not offer unprompted). It stops short of naming an alternative sibling, so it is not a full 5.

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