gate_subscribe

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

With no annotations, the description carries full disclosure responsibility. It discloses that the tool 'moves money,' reads the plan price on-chain, checks spending caps, and fails if no plan exists. These are important behavioral traits beyond the basic action, though it could mention success response or idempotency.

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 exceptionally concise at three sentences. The main action ('Buy or renew ... plan') is front-loaded, and every sentence adds essential information without redundancy.

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?

While the description covers the input and failure condition, it does not mention the return value or success behavior. Given the absence of an output schema, this gap could confuse an agent about what to expect after a successful subscription purchase.

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 100% with decent descriptions, but the tool description adds value by clarifying that 'creator_wallet is the endpoint owner, not the agent's wallet' and that 'endpoint_id comes from the 402 manifest, not a URL.' This extra context helps an agent avoid common mistakes.

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 clearly states the action 'Buy (or renew) a creator's subscription plan' and identifies the resource as a 'Gate endpoint with unlimited access until expiry.' It differentiates from siblings by specifying the one-payment subscription model and mentions moving money, which is unique to this tool among siblings.

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 provides clear usage context: it is for buying or renewing a subscription, and it fails if the endpoint has no subscription plan. However, it does not explicitly compare to alternatives like gate_get_price or datahub_subscribe, nor does it provide when-not-to-use guidance.

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