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

readOnlyHint=true already establishes the safe-read profile, so the bar is lower. The description adds the returned field set (booking id, member, check-in state, recurring-booking id), which is genuine extra context, but says nothing about pagination behavior or the default treatment of cancelled bookings.

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?

One tight front-loaded sentence plus a compact endpoint reference; no filler. Slight cost is that the second sentence is metadata that some agents never use, but it earns its place for API-aware callers.

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?

With no output schema, the description usefully names the returned fields, and the schema covers pagination and sorting defaults. What remains thin is the cancelled-bookings default and any indication of result size or ordering guarantees, but nothing essential to calling it correctly 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 description coverage is 100%, so all six parameters (page, pageSize, sortBy, sortOrder, sessionId, includeCancelled) are already documented with defaults, ranges and enums in the schema. The description adds nothing about parameters beyond what is structured, so the baseline 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), resource (bookings) and scope (one session) and enumerates the returned fields, so it reads as the class roster rather than a generic bookings list. It doesn't explicitly name the closest sibling (momence_list_member_session_bookings) to draw the contrast, so it stops short of 5.

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 class roster' for one session, but there is no explicit when-to-use guidance or statement of when to prefer momence_list_member_session_bookings / momence_list_sessions instead. The agent must infer the choice from the resource scoping.

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