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

The readOnlyHint annotation already establishes that this is a safe read. The description adds meaningful context by flagging 'HEALTH DATA' and itemizing the sensitive fields returned, but it says nothing about access permissions, error/not-found behavior, or how the payload is shaped beyond the field list.

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 with the scope front-loaded and no wasted framing. The dense field inventory is slightly list-like but earns its place because there is no output schema to describe the return values.

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 read-only single-record fetch with one fully described parameter and no output schema, the description covers the key elements: what comes back, that it contains health data, and the underlying endpoint. It could be more complete by noting not-found behavior or access constraints, but nothing essential to calling it is missing.

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 coverage is 100% for the single patient_id parameter, so the schema fully documents it. The description only echoes this via '{id}' and adds no format or constraint details beyond what the schema provides, making the baseline 3 appropriate.

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 states a specific resource and scope ('One patient in full') and enumerates exactly which fields are returned, which implicitly distinguishes it from splose_list_patients. It never names a sibling tool explicitly, so it stops short of full differentiation.

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 only implied by the endpoint reference 'GET /patients/{id}' and the singular 'One patient'. There is no explicit when-to-use guidance, no mention of when to prefer list_patients or search-style tools, and no note about behavior when the patient isn't found.

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