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

Annotations already declare readOnlyHint=true, so the safety profile is covered. The description adds the institution-scoping behavior, but says nothing about pagination defaults (despite page/per_page params) or result volume, which is the main behavioral trait left undisclosed for a list endpoint.

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 short sentences, front-loaded with the action and scope, with zero filler. The trailing 'GET /insurance_plans' is mildly redundant with the name but cheap and confirms the endpoint.

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, zero-required-parameter list tool with 100% schema coverage and annotations covering safety, the description is adequate. It stops short of the one thing an agent most needs here: disambiguation from nexhealth_list_insurance_coverages and any note on pagination behavior for a potentially large list.

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 all four parameters are already documented in the schema; baseline is 3. The description's 'optionally scoped to a location' loosely maps to location_id but adds no syntax, default, or interaction detail beyond what the schema provides.

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 ('List insurance plans') plus the scope ('known to the institution'), which tells the agent what set is returned. It does not, however, distinguish itself from the close sibling nexhealth_list_insurance_coverages, so the agent cannot tell from the description alone which of the two returns plans vs. enrollment/coverage records.

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?

'optionally scoped to a location' implies the primary usage context, but there is no explicit when-to-use, when-not-to-use, or routing to an alternative (e.g. insurance_coverages, list_locations). Usage is inferred rather than stated.

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