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

Annotations already declare readOnlyHint=true, so the safety profile is covered. The description adds value beyond that by disclosing the return shape (path, settings, notes, change_with) in the absence of an output schema, and by flagging that notes explain how to interpret the values — a read-semantics detail annotations cannot convey.

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?

Front-loaded summary stating what the section contains, followed by a separate returns block, with no filler sentences. The parenthetical behavioral examples (silent digest, held send, unstored conversation) earn their space by making the trigger concrete rather than padding.

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?

A two-parameter read tool with no output schema is adequately covered because the description supplies an explicit returns block and states where the values live on the Settings page. Only minor gaps remain, such as whether `change_with` names map to sibling tool names the agent can call directly.

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 coverage is 100% with an 8-value enum for `section` and a full explanation of `on_behalf_of` including delegation to teammates and agency clients. The description adds the concept that each section carries its own reading notes but supplies no per-parameter detail beyond the schema, 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+resource+scope: 'One section of the user's Settings page' with its path, current values, reading notes, and the tools that change it. This clearly distinguishes it from the many set_* siblings (set_privacy_setting, set_daily_digest, set_reply_alerts) by being the read side, and the enumeration of the eight section values makes the boundary concrete.

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?

Gives three explicit trigger conditions: the user asks about a setting, asks why something behaves as it does (silent digest, held send, unstored conversation), and a proactive 'before changing one'. It does not name a when-not-to-use case or point at a specific alternative tool, so it stops short of the top mark.

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