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

No annotations are provided, so the description carries the burden. It discloses that the tool returns a temporary svix_url and mentions cost, but does not discuss side effects, reversibility, or permissions. It adds some useful context beyond the name, but not rich behavioral detail.

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 concise with four sentences, each adding value: purpose, prerequisite, parameter guidance, return value, and cost. No redundant or unnecessary text.

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?

The tool is simple (one optional param) and has an output schema. The description covers purpose, usage prerequisite, parameter behavior, and return value. It is largely complete, though it could elaborate on what 'temporary' means or clarify alternatives like create_svix_dashboard_url.

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 coverage is 100%, and the schema's parameter description already includes the source (clerk.get_connected_accounts) and the default behavior. The tool description repeats this information without adding new meaning, so it meets the baseline but does not exceed it.

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 clearly states the tool creates a Svix app and associates it with a Clerk application for webhook delivery, using a specific verb and resource. It distinguishes itself from sibling tools like create_svix_dashboard_url and delete_svix_app.

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 instructs to call clerk.get_connected_accounts first and explains how to target a specific connection via clerk_instance_id or use the default. It does not explicitly mention alternatives or exclusions, but provides clear contextual usage guidance.

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