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

Annotations cover the safety profile (readOnlyHint=true, openWorldHint=false), and the description adds meaningful context beyond them: it flags that user-authored fields are untrusted content and instructs quoting rather than following. It stops short of stating access/permission requirements or failure behavior for a plan the caller cannot see.

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 tight sentences: the first front-loads what the tool returns, the second carries the security guidance. No wasted text, though the front-loading would be sharper with an explicit verb.

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?

An output schema exists so return values needn't be explained, and annotations cover the read-only profile; the untrusted-content warning is a valuable addition. The remaining gap is that it never explains where plan_id comes from, which matters even for a one-parameter tool.

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 0% and the description never mentions the required plan_id parameter, its UUID format, or how to obtain it (e.g., via list_plans). The single parameter is fairly self-evident, but the definition adds no semantics beyond the bare schema.

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 identifies the resource (a plan) and the access scope ('you organize or are invited to') and names what the result contains (every invitee and their answer), which distinguishes it from list_plans. It is written as a noun phrase with no explicit retrieval verb, so an agent must infer 'fetch by ID' from the name and title rather than the prose.

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 statement of when to use this tool versus list_plans or get_group, and no prerequisites or conditions are given. The scope phrase ('you organize or are invited to') hints at access context but never routes the agent to an alternative.

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