cloud_subscription_update

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

With no annotations, the description carries the full burden, and it does disclose key behavioral traits: updates are mutating, upgrades are prorated, downgrades apply next cycle, and cancellation requires specific parameter values. It also implies an approval step. It is not exhaustive about side effects or return behavior, but it covers the most important operational semantics.

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 description is compact and avoids padding, but it mixes Vietnamese and English awkwardly, and the trailing '/ Update or cancel renewal' partly duplicates the Vietnamese content. The information is dense but the structure is somewhat run-on and not cleanly front-loaded.

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 5-parameter mutation tool with no annotations and no output schema, the description gives solid behavioral context but leaves gaps: service_id is not explained, the approval mechanism is vague, and there is no indication of what response the agent should expect. The core workflow is clear, but an agent would still need to infer some call details.

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%, so the description must compensate. It does clarify the meaning of auto_renew=false and cancel_action values, and it maps plan_code/period to changing plan/cycle. However, the required service_id parameter is not mentioned, and some fields like period are only implied. Partial compensation, not full.

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 a clear verb and resource: changing package/cycle/renewal or cancelling a subscription. The phrase 'Update or cancel renewal' reinforces the action, and the cancel path is spelled out. It does not explicitly name sibling tools, but the intent is not ambiguous.

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?

The description gives useful process context: read subscription and prices, estimate, then get approval. It also explains when upgrade vs downgrade takes effect and how to cancel via auto_renew=false with cancel_action. It does not explicitly mention when not to use this tool or point to alternatives, so it falls just short of a 5.

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