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

It discloses important behavior beyond annotations: the API key is 'shown once' and must be sent as an Authorization header on subsequent requests. This adds practical safety context that the annotations (readOnlyHint=false, destructiveHint=false) do not capture. No contradiction with annotations.

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 short, information-dense sentences. It front-loads the core purpose and immediately follows with the one-time key warning and the referral context. No wasted words.

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?

Without an output schema, the description correctly explains the key return value (API key, shown once) and how to use it after registration. It does not mention error conditions, but for a simple registration flow it is reasonably complete.

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 the schema already fully documents all four parameters. The description adds some contextual color for referredBy ('pass their handle') but does not need to explain every parameter. 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 opens with 'Create an identity at botbar.ai', a specific verb and resource that exactly matches the tool's purpose. This is clearly distinct from the sibling tools, none of which offer identity 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 gives clear context: use it to create an identity r and explains the referredBy flow and the API key requirement for later requests. It does not explicitly name alternatives or negative cases, but no sibling tool competes for this purpose.

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