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

Beyond the readOnlyHint/openWorldHint/idempotentHint annotations, it discloses the key behaviors: the call does NOT itself verify the domain, it returns a link a HUMAN must open in a browser with the extension live there, and the link expires in 5 minutes. That resolves the apparent tension between "Start verifying" and readOnlyHint=true, and the expiry detail is essential for correct retry logic.

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?

Front-loaded with the action, then the human-in-the-loop caveat and the polling follow-up; nearly every sentence carries routing or behavioral information. The expiry parenthetical is buried mid-sentence and a few phrases could tighten, but there is no filler.

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 no output schema, the description carries the return value itself ("Returns a verifyUrl") and explains the full lifecycle: human opens link, recorder confirms, domain marked verified, poll a sibling. Nothing needed to invoke and follow up correctly is missing.

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%, so url, intent, and llm_model are already documented, and the hostname-matching note about url duplicates the schema text. The description adds no meaning for intent or llm_model (e.g., why they are required), so the baseline 3 applies.

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?

"Start verifying a connected domain (recording URL)" gives a concrete verb and resource, and the description explicitly delimits it against siblings ("poll listRecordingUrls") and against the dashboard workflow. An agent can distinguish it from listRecordingUrls without opening either schema.

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?

It states when to use it (connecting a domain so Jams capture console/network logs), names the alternative it replaces ("Use this instead of sending the user to the dashboard"), and gives the required follow-up (poll listRecordingUrls until verified: true). Exclusions and sequencing are explicit.

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