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

With no annotations, the description carries the full burden. It discloses that the private key is returned exactly once and never stored, which is critical behavioral information. It also clarifies that no registration is involved. It does not mention any side effects or prerequisites, but for a wallet generation tool this is adequate.

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, front-loaded with the primary purpose and outputs, and includes the key behavioral caveat (one-time return, no storage) without any fluff. 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?

The tool is simple (no params, no output schema), but the description explains what is returned (principal and PEM key) and the one-time nature. It does not specify the exact return structure (e.g., JSON field names), but given the low complexity and the explicit mention of the two outputs, it is sufficiently complete for an agent to call it correctly.

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?

The tool has zero parameters, and the schema coverage is 100% (empty schema). Per the rubric, a baseline of 4 is appropriate for 0 parameters. The description adds no parameter-specific meaning because there are none to explain.

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 specific verb ('Generate'), a specific resource ('fresh Ed25519 wallet'), and explicitly names the outputs (ICP principal and PKCS#8 PEM private key). It is clearly distinct from all siblings (check_cycles, claim_faucet_grant, deploy_site, deploy_upload_chunk, get_fuel_link), none of which relate to wallet creation.

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 implies when to use it: when a new wallet is needed, and clarifies that no signup or on-chain registration is required, so it is the direct way to obtain a keypair. It does not explicitly name alternatives, but no sibling serves a similar purpose, so the context is sufficient.

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