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

Annotations already declare readOnlyHint=true, idempotentHint=true, and openWorldHint=false, so safety is covered structurally. The description adds real value beyond that by disclosing the shape of the payload (per-variant FHIR HealthcareService with duration and SEK pricing), which matters since no output schema exists.

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 dense sentence plus a short handoff sentence. Purpose and output content are front-loaded, and the downstream dependency is appended where it belongs. No filler.

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 one-parameter list tool with annotations covering the safety profile, the description supplies the essentials: what comes back and how the result feeds get_available_slots. Minor omissions (pagination, behavior on an unknown slug) keep it from a 5 but are not blocking.

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?

With a single parameter at 100% schema description coverage, the schema fully documents clinic_slug including its origin in search_clinics and an example. The description adds no further syntax or format guidance, so 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?

States a specific verb and resource ('List the bookable services of one clinic') and goes further by naming the returned data (duration, price in SEK, FHIR HealthcareService per bookable variant). The closing clause ties it to get_available_slots, so an agent can situate it among its siblings immediately.

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 establishes a clear workflow: this tool supplies the variant id that get_available_slots consumes, and the schema points back to search_clinics for the slug. It stops short of explicit when-not-to-use guidance, but the chain context is unambiguous.

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