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

With no annotations, the description carries the full burden and does so unusually well: it discloses the trust model (owner key never leaves the process), the exact limits of the hosted signer (fees to treasury and builder-fee approval only), and the two-phase signed-challenge flow. This is the kind of context an agent cannot get from any structured field.

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?

Purpose and prerequisite are front-loaded, the security guarantees follow, and the two-call procedure is signposted with 'TWO CALLS' so the sequencing cannot be missed. Dense but no sentence is filler.

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 3-parameter, annotation-free mutation tool with no output schema, it covers prerequisites, security semantics, and the call sequence. Minor gaps remain: whether the wallet persists/is one-per-agent, what happens if a wallet already exists, and what the first call's response looks like beyond 'a message naming your key's fingerprint'.

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%, so the baseline would be 3, but the description adds real meaning by explaining that the parameters belong to two distinct invocations and that nonce/signature come from the first call's returned message. It stops short of describing formats (EIP-191 is named, but signature encoding is left to the schema).

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?

States a specific verb and resource ('Create your trading wallet') and immediately scopes it ('required for LIVE trading'), which distinguishes it from the sibling create_copy_wallet and the read-only get_trading_wallet. An agent knows exactly what entity this tool produces.

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?

Gives a clear trigger condition (needed for LIVE trading) and a hard precondition ('your agent wallet must have nothing open'), plus an explicit two-call sequence with the inputs for each call. It does not name an alternative or exclusion (e.g., versus create_copy_wallet), so it falls 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.