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

Annotations already declare readOnly, idempotent, non-destructive, and open-world, so the safety profile needs no restating. The description adds useful operational context in 'Mindbody calls: 1' (cost per invocation) and the note distinguishing MembershipId values from client contract IDs, but it says nothing about pagination behavior or response shape. The caveat also references 'RestrictToMembershipIds', a parameter that does not appear in this tool's schema, which weakens the added value.

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?

The definition is short and front-loads the endpoint and purpose, which is good. However, the 'Get Services — GET /sale/services' opener largely restates the name and title, and the RestrictToMembershipIds note consumes a full line to describe a parameter this tool does not accept.

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, 14-optional-parameter list tool with full schema coverage and no output schema, the description covers purpose and invocation cost adequately. The main residual gap is that an agent gets no sense of what distinguishes a 'pricing option' result from products or contracts, which matters given the crowded sibling set.

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% across 14 parameters, so the schema does the heavy lifting and a 3 is the correct baseline. The description's only semantic addition is the MembershipId-versus-contract-ID note, which does not map to any parameter present in the schema, so it contributes little for this specific tool.

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 pairs a specific verb and resource with the underlying endpoint (GET /sale/services) and clarifies that 'services' means 'pricing options available for purchase at a site', which is the key disambiguation an agent needs. It never names a sibling such as get_products or get_contracts, so the boundary between services, products, and contracts is left to inference.

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 explicit when-to-use guidance and no comparison against adjacent tools like get_products, get_contracts, or get_session_types, even though 'service' overlaps heavily with those concepts. The only guidance-like content is an ID-type caveat that does not name an alternative tool or a selection condition.

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