identity_register

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

With no annotations, the description carries the burden and does reasonably well: it discloses this is an on-chain write, that the return is a transaction ID rather than the agent ID itself, and that a wallet must be unlocked first. It does not mention that registration costs fees, whether identity is transferable afterward, or what failure modes look like (e.g., duplicate URI), leaving some gaps 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?

Front-loaded with purpose, then return value, then prerequisite — good ordering with almost no wasted wording. The closing 'Tip: call earning_opportunities' sentence is off-topic marketing that does not help invoke this tool and slightly dilutes focus.

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?

There is no output schema, so the description correctly explains the return (transaction ID) and the two-step resolution of the agent ID, plus the wallet prerequisite. It stops short of describing failure handling or the sponsored-transaction path, but for a 4-param, 0-required registration call it is largely sufficient.

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 100%, so fee/uri/metadata/sponsored are already fully documented in the schema. The description adds no extra guidance on parameter interactions (e.g., fee presets vs. micro-STX, hex encoding constraints on metadata) beyond what is already structured. 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?

States a specific verb+resource+standard: 'Register a new agent identity on-chain using ERC-8004 identity registry.' This clearly differentiates it from siblings like identity_get, identity_set_uri, identity_transfer, which are read/update operations on an existing identity.

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 concrete prerequisite ('Requires an unlocked wallet') and the follow-up step ('Check the transaction result to get the assigned agent ID'), which is exactly the workflow an agent needs. It does not name alternatives or explicitly say when not to use it, and the trailing earning_opportunities tip is unrelated to selecting this tool.

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