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

No annotations are provided, so the description carries the full burden. It discloses that activation is for 30 days, costs 79 USDC on Solana, and requires a setup intent. However, it does not mention side effects (e.g., idempotency, reversibility, what happens if already activated), permissions, or error behavior.

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 two sentences and very concise. It front-loads the key purpose, cost, and prerequisite without any wasted words. Every sentence adds value.

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?

Despite having three required parameters and no output schema or annotations, the description is quite minimal. It lacks details on return values, error cases, or how to obtain the required parameters (setup_token, delivery_claim). More context is needed for an agent to use this tool effectively.

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%, yet the description only minimally explains the parameters. It implies setup_intent_id is the intent from the bootstrap setup, but does not explain setup_token or delivery_claim at all. The description fails to add meaningful semantics beyond the schema's type constraints.

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 specifies the action (activate), the resource (Hilt Pay API starter), duration (30 days), cost (79 USDC on Solana), and a prerequisite (requires a free Agent Bootstrap setup intent). It effectively distinguishes this from sibling tools like hilt_activate_growth and hilt_activate_scale by naming the specific tier.

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 states a prerequisite ('Requires a free Agent Bootstrap setup intent'), implying the agent should use a setup tool first. However, it provides no explicit guidance on when to choose this tool over alternatives like hilt_activate_growth or hilt_activate_scale, nor does it mention when not to use it.

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