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

With no annotations provided, the description carries the full burden of behavioral disclosure. It adds valuable context: the URL is sensitive ('do not log or expose it'), grants access to webhook configuration, and is temporary. This goes beyond the basic schema and alerts the agent to handle the output carefully, though it does not mention details like expiration time or failure modes.

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 four sentences long and every sentence earns its place: it states the purpose, warns about sensitivity, gives usage prerequisites, specifies the return value, and notes the token cost. It is front-loaded with the main verb and resource, making it easy to scan.

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?

Despite the absence of annotations, the description is complete enough for an agent to safely invoke the tool. It covers what is returned (svix_url), the prerequisite call, the optional parameter, and the sensitive nature of the output. The presence of an output schema reduces the need to describe the return format in detail.

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 input schema already documents clerk_instance_id with its origin (from get_connected_accounts) and default behavior (omit to use default). The description repeats this information, adding no new semantic detail. Since schema coverage is 100%, the baseline score of 3 is appropriate.

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 uses a specific verb and resource: 'Generate a temporary URL for accessing the Svix management dashboard for a connected Clerk application.' This clearly states what the tool does and distinguishes it from other create token tools in the sibling list, such as clerk.create_actor_token or clerk.create_admin_portal_link_token, by focusing on the dashboard URL.

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 provides a clear prerequisite ('Call clerk.get_connected_accounts first') and explains how to choose the target connection ('Pass clerk_instance_id... or omit it to use the default account'). This gives actionable usage context, though it does not explicitly name alternative tools or state when not to use this tool, which would earn a 5.

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