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

Annotations already declare readOnlyHint=false, destructiveHint=true, idempotentHint=true, and openWorldHint=false, so the safety profile and write semantics are covered structurally. The description adds useful domain context — these rows gate what callers can receive by text, and they remove raw URLs from voice prompts — but it does not explain the blast radius of the destructive flag (e.g. that deactivating a link silently breaks sends) or any permission requirements. That extra context is what would push it above a 3.

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?

Two tightly written sentences with the purpose front-loaded and the caller-facing rationale second. Nothing is redundant, though the second sentence leans slightly toward motivation rather than operational detail an agent needs before invoking.

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 an output schema present and full schema coverage, the description needn't document return values, and the annotations carry the safety profile. The remaining gap is behavioral: what "repair" concretely means, whether omitted link_keys are left untouched or removed, and whether dry_run is expected as a first step. For a destructive, idempotent upsert tool that is a small but real omission.

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%, so all three parameters and every nested item field are already documented, establishing a baseline of 3. The description contributes a taxonomy of link types (booking, directions, cancellation, sister-location, service-specific) that enriches what link_key values mean, which is modest added value rather than new mechanical detail. It does not explain the create-vs-update resolution rule beyond what the schema's field description already states.

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 names a specific verb pair (create or repair) and a concrete resource (business_links entries), and ties it to its downstream consumers send_link/send_sms. That makes the tool's role distinguishable from the many configure_* siblings. It stops short of 5 because it never says what makes this different from the other configuration tools beyond the resource name.

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?

"Create or repair" implies the usage context (fixing broken or adding missing links), and naming the send tools gives an agent a reason to reach for it. However, there is no explicit when-not guidance, no mention of a validate-first workflow via dry_run, and no note on what to do about link_key collisions or removals.

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