Resolve vanity URL to SteamID

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

Annotations already indicate readOnlyHint and openWorldHint. Description adds key behavioral details: requiring an API key and returning a specific false flag. No contradiction with annotations.

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 sentences, no wasted words. First sentence informs purpose and input, second covers prerequisite and a possible output. Front-loaded with action and result.

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 one parameter, 100% schema coverage, existing annotations, and an output schema present, the description covers the input format, a prerequisite, and a failure case. No gaps.

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 covers the parameter fully; description adds a concrete example ('gabelogannewell') and explains its origin from the URL. Provides meaning beyond the schema description.

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?

Clearly specifies the action (convert/ resolve), the resource (vanity profile name), and the result (17-digit SteamID64). Distinguishes itself from sibling tools which are about games, reviews, or player lists; this is the only one that resolves vanity URLs.

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?

States requirement for STEAM_API_KEY and describes behavior when the name doesn't resolve (found:false). Implicitly tells when to use (when you have a vanity URL part) but could be more explicit about when not to use (e.g., if already have SteamID64).

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