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

Annotations already declare readOnlyHint=true, and the description reinforces this by citing the read-only GET /1.3/server/{uuid} endpoint. It adds no further behavioral context such as error behavior for missing UUIDs or freshness of data. With annotations carrying the safety profile, a 3 is appropriate.

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 tight sentences, front-loaded with the field inventory, with the API endpoint tacked on efficiently at the end. The field list is long but each item is a genuinely informative return-value hint rather than 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?

There is no output schema, so the description's enumeration of returned fields is doing real work in telling the agent what comes back. The single parameter is fully documented by the schema. Complete for a simple read-by-ID tool, though endpoint/error behavior is left implicit.

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 UUID pattern is fully specified in the schema, so the schema does the heavy lifting. The description adds no syntax or format detail beyond it. Baseline 3 is correct.

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 (get full details) and resource (one server), and the enumeration of returned fields (state, plan, cores/memory, interfaces, storage, firewall, backup, labels, tags) makes the scope unmistakable. It is clearly distinguished from sibling upcloud_list_servers, which returns many servers.

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?

Usage is implied by 'one server' and the UUID parameter — fetch details for a specific known server — but the description never states when this is preferable to upcloud_list_servers or names any alternatives or prerequisites. Adequate but with a clear gap in routing guidance.

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