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

Annotations already declare this is a mutating, non-idempotent, destructive write, so the bar is lower. The description adds real behavioral value beyond that: refusal semantics ('a missing choice, an empty list or an unrecognized code is refused and nothing is stored') and the KYB-gated auto-approval vs. review routing. It does not say whether an existing policy is overwritten, which matters given destructiveHint=true.

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?

Three tight sentences, front-loaded with the mandatory destination choice before the approval-flow detail. Dense but every clause carries information; the ISO code enumeration is the only slightly heavy phrase.

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 six parameters, one required, no output schema, and 50% schema coverage, the definition covers the destination/refusal path well but leaves the required profiles parameter and the channels/policy_version semantics unaddressed. An agent could invoke it correctly on the destination axis but not confidently on the payload axis.

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 50%: countries and all_countries are thoroughly described in the schema (largely duplicating the description), but channels, policy_version, and — critically — the REQUIRED profiles parameter are undocumented in both places. The description only gestures at these ('capabilities profiles/channels/destinations') without explaining what values profiles accepts. Baseline 3 fits given the partial coverage.

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 states specific verbs and resources ('Select capabilities profiles/channels/destinations and accept the outbound policy'), which clearly separates this write operation from the read-only sibling get_capabilities. It stops short of naming that sibling explicitly or otherwise differentiating itself from evaluate_outbound_policy or authorize_outbound.

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 establishes the conditions under which the call succeeds (destination choice required; auto-approve within default caps once KYB is approved, otherwise review), which is useful conditional context. However, it never says when to reach for this tool versus get_capabilities, evaluate_outbound_policy, or authorize_outbound, so the agent must infer the routing.

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