Gravatar Lookup

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

Annotations already declare readOnlyHint, openWorldHint, idempotentHint, and destructiveHint=false, so the safety profile is covered. The description adds only the 'public' qualifier and does not disclose behaviors such as absence handling or rate limits, but no contradiction exists.

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?

Eleven words in one sentence front-load the action, resource, and input. There is no filler or redundant explanation.

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 single-required-parameter lookup with rich annotations and an output schema, the description is nearly complete: it defines the resource and input. The main missing element is usage routing relative to sibling tools, but the tool's low complexity limits the impact.

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 single email parameter is self-explanatory, and the description confirms it is the 'email address' whose profile is looked up. However, schema description coverage is 0% and the description adds no format, normalization, or edge-case information; this is minimally adequate for one obvious string parameter.

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 ('look up'), resource ('public Gravatar profile'), and input ('email address'), so the core action is unambiguous. It does not explicitly compare itself with sibling identity/lookup tools, though the Gravatar resource is unique among the sibling list.

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?

No guidance is given about when to choose Gravatar lookup over siblings such as keybase_lookup, check_email_breaches, or domain_email_search, and no exclusion conditions are stated. The agent is left to infer use cases from the tool name.

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