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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is fully covered elsewhere. The description adds only the personal-scope constraint (signed-in member), with no note on authentication requirements or what happens when the member has no gyms.

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?

A single short sentence with zero filler, and the scoping qualifier is front-loaded. It is arguably too terse, but nothing in it is wasted.

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 trivial, parameterless-required, read-only listing tool whose safety profile is fully covered by annotations and whose only parameter is fully documented in the schema, the description supplies the essential scope. A hint at the returned shape would be nice but is not required without an output schema.

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?

There is one optional parameter (locale) with 100% schema description coverage, including the enum values and default. The description adds nothing about it, but the schema already carries the full burden, 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?

The description names the specific resource (gyms) and a precise scope (gyms the signed-in member belongs to), which implicitly distinguishes it from search_gyms and get_gym. However, it is delivered as a noun fragment with no verb, so it reads as a label rather than a stated operation.

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?

There is no guidance on when to use this versus siblings like search_gyms, get_gym, or my_bookings. The agent must infer from the scope phrase alone that this is the personal-membership listing rather than a lookup or search.

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