create_mailbox

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

No annotations exist, so the description carries full burden. It does not disclose behavioral traits such as permissions required, potential side effects, idempotency, or any constraints beyond parameter descriptions. The output schema is present but not referenced.

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?

Extremely concise: one line summary followed by parameter descriptions. No wasted words, front-loaded with purpose. Every sentence serves a purpose.

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?

Given the tool's simplicity (2 params, output schema present), the description covers the core purpose and parameter semantics well. It lacks mention of return value or error handling, but the output schema likely fills that gap. Could be improved by noting that the created mailbox object is returned.

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?

The description adds meaning beyond the input schema by explaining the 'name' as a display name and 'parent_id' for nesting, with default value meaning top-level. Since schema description coverage is 0%, this is valuable. However, constraints like name length or allowed characters are missing.

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 'Create a new mailbox (folder)', using a specific verb and resource. It distinguishes from sibling tools like destroy_mailbox, update_mailbox, and list_mailboxes by being the creation counterpart.

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?

No guidance on when to use this tool versus alternatives. An agent must infer from the name and siblings. No conditions, prerequisites, or exclusions are mentioned.

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