Quote VPN period renewal

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

With annotations only declaring the mutation/idempotency profile, the description carries the heavy lifting and does so well: no charge, required scopes (networking:read/manage, full/read defaults do not grant networking), backend enforcement of ownership, feature availability and service 2FA locks, approval-before-change, and the pending-operation polling contract. It also clarifies that an accepted operation is not proof of connectivity and that only in_progress=false with reason_kind=failure is a real failure.

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 first sentence is front-loaded and effective, but the remainder is a single dense run-on spanning permissions, backend enforcement, polling semantics, idempotency recovery, entitlement gating, catalog selection, currency disclosure and payment caveats. Given the volume of content, the lack of any structural grouping hurts scanability.

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?

For a two-parameter mutation-style tool with no output schema, the description covers everything an agent needs: auth scopes, prerequisites, approval flow, idempotent recovery, the asynchronous operation contract and the reason_code/reason_kind vocabulary to poll on, plus spend-cap and payment caveats. Nothing material 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 description coverage is 100%, so gateway_id and idempotencyKey are already documented in the schema and the baseline is 3. The description adds lifecycle meaning to the key ('same Idempotency-Key is required for quote and confirmation', 'reuse only the original key and unchanged request'), but it largely restates the schema's own guidance rather than extending 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 opening clause names a specific verb and resource with scope: 'Quote the VPN's next month on its actual paid scope; no charge.' An agent immediately knows this is a non-charging price preview for a one-month VPN period. It does not, however, explicitly distinguish itself from the nearby sibling quote_network_product_renewal or renew_vpn_period.

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 gives clear operational preconditions and sequencing: 'Read current capabilities and owned resource state first; obtain approval for the exact change', plus the required permissions (networking:read vs networking:manage) and the instruction to pick a supported live catalog tier. It stops short of stating when to prefer this quote over the sibling renewal/quote tools.

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