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

Annotations already cover safety (readOnly, idempotent, non-destructive), so the bar is lower. The description adds genuinely new behavioral facts beyond annotations: the link is short-lived, requires the Business plan, and requires the recordings.read grant. It does not say what happens if the grant is missing or whether the link expires in a retrievable way.

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, front-loaded with the return value, then the authorization gates. Every clause earns its place and 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?

A read-only one-param tool with no output schema is fairly simple, and the auth/plan gates are the key missing pieces that were supplied. Still, call_id provenance and error behavior on missing plan/grant are unstated, leaving some gaps an agent would want.

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 0% and the single call_id parameter is undocumented in both schema and description. Baseline for one param without schema documentation is still a 3, and the description adds no format or source hint (e.g., how to obtain call_id). It compensates only weakly.

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?

States a specific verb+resource ('Returns a short-lived streaming link for a recorded phone call'), which distinguishes it from siblings like get_transcript (text) and get_call (metadata). It does not explicitly name those siblings, so it falls short of a 5.

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?

Usage is implied by the resource description, but there is no explicit when-to-use/when-not guidance and no routing to alternatives such as get_transcript or search_calls. The mention of plan and scope requirements is a gate, not usage guidance.

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