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

Annotations already declare readOnlyHint=true, so the safe-read profile is covered by structured data. The description adds that records originate from a treatment note, which is mild contextual value, but says nothing about pagination, ordering, empty results, or auth requirements. With annotations carrying the safety burden, 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 compact sentences, front-loaded with the purpose before the endpoint detail. Every clause earns its place: the field list doubles as return-value documentation and the endpoint adds integration context.

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 no output schema, the description usefully compensates by naming the returned fields (code, description, start/end date, source note). This is close to complete for a simple one-parameter read tool; only pagination/ordering behavior is left unspecified, which is a minor gap.

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?

Only one parameter exists and schema coverage is 100%, so the schema already documents client_id fully (numeric id, ClientId/ClientNumber). The description adds no syntax or format detail beyond reinforcing that a single client is targeted. Baseline 3 applies when the schema does the heavy lifting.

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 ('List') and resource ('the diagnoses recorded for one client'), then enumerates the returned fields. No sibling tool deals with diagnoses, so it is trivially distinguishable, and the endpoint reference (GET /client/{clientId}/diagnoses) reinforces the single-client scope.

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 the scoping phrase 'for one client' — the agent can infer this retrieves a specific client's diagnoses rather than a bulk list. However, there is no explicit when-to-use guidance, no mention of prerequisites (e.g., a valid client id must exist), and no alternatives named among the 18 siblings.

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