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

Annotations already declare destructiveHint=true, idempotentHint=false and openWorldHint=true, so the safety profile is covered. The description adds real value by disclosing the production-traffic-routing effect, which the hints do not convey, but it omits reversibility, failure behavior, and the approval requirement implied by approval_id.

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?

One clean, front-loaded sentence with zero filler, but for a 10-parameter destructive production operation it is under-specified rather than truly concise—size is appropriate to length, not to complexity.

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, annotations covering only hints, and 10 undocumented params, an agent still lacks the release-state precondition, the role of approval_id, and what success or failure looks like. The description is a headline, not a complete contract.

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 description coverage is 0% across 10 parameters, and the description explains none of them—not project_id, deployment_id, approval_id, team_id, or the beon_* bookkeeping fields. Unlike the 0-param baseline case, this tool has a large undocumented surface the text does nothing to compensate for.

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 concrete verb ('Complete') plus the resource ('rolling release') and the resulting effect ('route production traffic to the canary'). This distinguishes it from the start/approve/get rolling-release siblings without needing their schemas, though it doesn't name them explicitly.

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?

No guidance on when to call this rather than vercel_approve_rolling_release_stage, vercel_start_rolling_release, or vercel_promote_deployment. Prerequisites (an in-progress release with an approved stage, an approval_id) are never mentioned.

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