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

The description warns that the API key is shown once and should be saved, which is a clear behavioral note. It also clarifies that the account is isolated and includes a free-tier limit, giving the agent an understanding of consequences. It does not cover idempotency or what happens if the identity already exists, but the create action is well implied.

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 relatively concise but includes some extra marketing-like phrases (e.g., 'no registration, no email, no human steps' and 'your account is fully isolated'). These add context but could be trimmed without losing essential information. Still, it is well-structured and not overly verbose.

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 description covers the key outcomes (address and API key), the security note (save it), and the free-tier limit. It also provides next steps (using bus_mint). It lacks details on error conditions or whether signup is idempotent, but for a signup tool this is 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?

Both parameters are described in the schema with meaningful explanations (team slug becomes address prefix, agent name). The tool description itself does not add extra parameter details, but the schema descriptions are already informative, providing clear semantics.

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 clearly states the tool's purpose: creating a team's bus identity, and explicitly says it returns an address and API key. It distinguishes itself from sibling tools like bus_send or bus_reply by being the signup step, even though it does not name them explicitly.

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 (before using other bus tools) but does not explicitly contrast it with alternatives. It mentions using bus_mint afterwards, but does not state 'use this for creation, use bus_send for messaging' or similar direct guidance.

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