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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, covering the safety profile. The description adds value beyond these by specifying exactly what data is returned (all account settings) and clarifying the role of 'member' (the person the language and time zone belong to). It also notes the read is a snapshot ('as it stands'), which is useful context for using the result before an update.

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 description is two sentences, front-loading the list of settings and then the usage instruction. Every sentence earns its place: the first defines the resource, the second provides the workflow guidance. No wasted words or 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?

For a no-parameter, read-only tool with an output schema absent, the description fully covers what an agent needs: what the tool returns (all settings), why it exists (to read before updating), and how it relates to sibling update_account_settings. Annotations cover safety, so nothing critical 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?

The tool has zero parameters, so the schema provides no parameter details. The description does not need to add parameter meaning, but it does clarify what the output will contain, which is relevant context. Since there are no parameters, the baseline of 4 applies, and the description helps make the tool's purpose and result clear without parameter documentation.

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 states the verb 'Read' and the resource 'account settings', then enumerates the specific fields (legal name, billing country, postal address, VAT number, language, time zone, member). It clearly distinguishes itself from the sibling update_account_settings by framing itself as the read step before an update, so an agent can easily tell them apart.

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?

The description explicitly instructs 'Read it before update_account_settings' and explains why: 'the answer gives every setting as it stands, so you change the one the user named and leave the others alone.' This provides clear when-to-use guidance and directly contrasts with the sibling tool, leaving no ambiguity about the intended workflow.

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