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

readOnlyHint=true already tells the agent this is a safe read. The description adds value beyond annotations by disclosing the underlying FHIR call and the return shape (a searchset Bundle), which is genuinely useful since no output schema exists. However, it says nothing about pagination behavior even though a _count parameter 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?

Three short sentences, zero filler, and the core purpose is front-loaded ahead of the implementation detail. Every sentence earns its place.

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 simple read-only list tool with full schema coverage and no output schema, the description supplies the return type (FHIR searchset Bundle) and the endpoint, which is enough for an agent to call it correctly. The only minor gap is pagination behavior tied to the _count parameter.

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%, so both patient_id and _count are already documented in the schema. The description's `patient={id}` notation mildly reinforces the required parameter, but adds no format or syntax detail beyond the schema, so the baseline of 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 (List) and resource (a patient's allergies/intolerances), and the FHIR endpoint pinpoints the exact operation. This is unambiguous against siblings like list_conditions, list_medications, and list_immunizations, which the agent can distinguish by resource 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?

Usage is implied by the narrow resource scope, but there is no explicit when-to-use guidance, no mention of when a broader sibling such as get_patient_everything or start_patient360_query would be preferable, and no prerequisites stated. Adequate but with clear gaps.

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