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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=true, so the safety profile is fully covered structurally. The description adds only the raw endpoint (GET /services/{serviceId}) and says nothing about error behavior for a missing id or the shape of the returned object.

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 telegraphic fragments with zero filler and the essential scoping ('one service by id') front-loaded. It is efficiently sized for a trivial getter, though the endpoint fragment is largely redundant with the tool name.

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 single-parameter read tool whose annotations carry the safety profile and which has no output schema, the description is sufficient to invoke it correctly. Minor gaps remain around not-found behavior and return contents.

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% for the single parameter, so the schema already documents service_id. The description's 'by id' adds no format, source, or constraint detail beyond that baseline.

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 ('Get service', 'One service by id'), which cleanly separates it from the sibling list_services. It stops short of naming that sibling explicitly, so an agent must infer the singular/plural split from names alone.

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?

'by id' implies the precondition that a service_id is known, which is useful implied guidance. However, there is no explicit when-to-use or when-not-to-use statement and no mention of waitwhile_list_services as the alternative when the id is unknown.

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