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

Annotations only declare readOnlyHint=false and destructiveHint=false, so the description carries real weight and delivers: it discloses that a credential (API key) is issued as a side effect and that walletAddress is optional and can be supplied later. It does not state idempotency or what happens if the agentId already exists, which is a meaningful gap for a registration mutation.

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?

Three short sentences, front-loaded with the action and result, then prerequisites, then parameter caveats. Nothing is padded and the most decisive fact (you get an API key) comes first.

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 two-parameter registration tool with no output schema, the description supplies the key return value (API key) and the auth dependency, which is what an agent most needs. The remaining omission is failure/idempotency behavior on duplicate agentId, which is not critical to a first successful call.

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 both parameters are already fully documented, including UUID format and the 'add later for escrow' note. The description restates those same facts ('must be a valid UUID', 'wallet_address is optional — add it later for escrow deals') without adding syntax or validation detail beyond the schema, so the baseline 3 applies.

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, and outcome: register an agent and receive an API key. The credential outcome helps distinguish it from generic agent tools, but the description never acknowledges the sibling `agentpact.create_agent`, which an agent could easily confuse with this one.

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?

Explicitly frames this as 'the first step for any agent' and gives the triggering condition (the returned API key is required for all authenticated operations). It stops short of naming an alternative or stating what to do if the agent is already registered, so it is clear context without exclusions.

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