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

With no annotations, the description must carry the behavioral burden. It discloses the effect (grant lands on cycles ledger and funds the first deploy) and the one-time limitation. However, it does not specify what happens on a second call (error, no-op, etc.) or the return format, leaving a gap for a mutating tool.

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 three concise sentences, front-loaded with the action and the critical constraint. There is no fluff or repetition; every sentence earns its place.

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 simple one-parameter tool with no output schema, the description covers the purpose, effect, and key constraint. It omits error behavior on repeated claims, but this is a minor gap given the tool's simplicity. The description is sufficiently complete for an agent to know what to expect.

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% and the schema already describes the agent parameter accurately. The description adds no additional meaning beyond what the schema provides, so it does not enhance parameter understanding. Baseline 3 is appropriate.

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 verb 'claim', the resource 'one-time free 1T cycles grant from the FirstKey faucet', and the recipient 'an agent principal'. It also names the one-time constraint, which distinguishes it from sibling tools like check_cycles and get_fuel_link that serve different purposes.

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 explicitly states the 'one claim per principal, ever' constraint, which is a clear when-not to call repeatedly. It implies usage for the first canister deploy, but does not explicitly mention alternative tools or when to use them. This is adequate but not exhaustive.

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