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

Annotations already declare this is a mutation with destructiveHint=true and idempotentHint=true, so the safety profile is carried by structured data. The description adds only a narrow note about emails not being triggered by reads/acknowledgements; it never explains what a destructive change means here (e.g. whether disabling email access is reversible) or why eventId/participantId/requestId are required for what is framed as changing 'your' preferences.

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 with the field list front-loaded and no filler. The trailing email note is slightly tangential to the main enumeration but is relevant and brief.

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 seven parameters, three of them required identifiers, a destructive mutation hint, and no output schema, the description should say more about the identifier parameters and the consequences of the change. It is adequate for the user-facing field list but incomplete for correct invocation.

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% across 7 parameters. The description covers roughly four of them by name, but leaves eventId, participantId and requestId (apparently an idempotency key, given idempotentHint) completely unexplained, so an agent must infer required-parameter meaning from names alone.

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 a specific verb ('Change') and enumerates the updatable fields (display name, agent, email monitoring mode, email notification preference), which maps cleanly onto the name, agent, emailAccess and notifications properties. It does not explicitly differentiate itself from update_event or set_channels, but the purpose is unambiguous.

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 statement of when to use this tool versus siblings such as update_event or set_channels, and no prerequisites are described. The only contextual remark ('Reading and cursor acknowledgements do not trigger emails') is a behavioral aside, not usage guidance.

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