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

Annotations already declare readOnlyHint=true, openWorldHint=true, and destructiveHint=false, so the safety profile is covered. The description adds value beyond that by enumerating the returned content (name, plan limits, settings) — meaningful because there is no output schema — and pinning the endpoint as GET /account.

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 resource and purpose front-loaded and no filler. The trailing "GET /account" is marginally redundant with readOnlyHint but costs almost nothing.

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 zero-argument read tool with full annotation coverage, the description supplies purpose, return contents, and a call trigger — enough for correct invocation. The only soft spot is that it does not hint at response shape or whether limits are numeric caps versus policy text.

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 takes zero parameters, so there is nothing for the description to disambiguate; baseline applies. The credential-scoping note ("these credentials belong to") usefully implies the account is determined by auth rather than arguments.

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 RemoteLock account these credentials belong to: name, plan limits and settings" names the specific resource and enumerates the fields returned, so an agent knows exactly what it gets. No sibling tool exposes account-level data, so it is implicitly distinct, but the description never uses a verb to frame the operation beyond the raw "GET /account."

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?

"Use it to confirm which account is connected" gives an explicit trigger for calling it, which is genuinely helpful context. There are no competing alternatives to rule out, so the absence of exclusions is not a real gap.

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