bunny_create_pull_zone

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

Annotations already signal the write nature (reaOnlyHint=false) and non-idempotency (idempotentHint=false), and the description adds context about the default hostname and the caching relationship to origin — a small but real contribution. It does not disclose what happens on name collision, whether the call returns the new zone ID, or that repeated calls create duplicate zones, which are the meaningful unspecified behaviors for a createop. 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?

Three short sentences, each earning its keep: the first states the action, the second explains the default hostname and caching output, the third covers the alternative origin mode. The core purpose is front-loaded and there is zero fluff or repetition of schema text.

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?

With no output schema, the description does not say what the tool returns (e.g., the created zone ID or full hostname), which an agent invoking a create op typically needs. Parameters are fully covered by the schema and safety traits by annotations, so the main remaining gap is the response/confirmation behavior and post-create verification. Reasonably adequate for a low-complexity 4-parameter tool, but not 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 baseline of 3 applies. The description's mention that the pullzone 'caches content from the specified origin_url' and that storage_zone_id serves as an alternative origin adds a mild clarification of the either/or relationship between the two origin parameters — but most parameter meaning (name subdomain, type default, origin role) already lives in the schema. The type parameter is not surfaced in the description atall.

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 a new CDN pull zone' — a specific verb (create) plus a concrete resource, and the create verb cleanly distinguishes it from the sibling family (update_pull_zone, deete_pull_zone, list_pull_zones, get_pull_zone, purge_pull_zone_cache). It also adds useful specifics — default hostname name.b-cdn.net and origin caching — so aagent has a solid mental model of what the operation produces.

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 usage via the create verb and gives internal guidance on choosing between origin_url and storage_zone_id ('Alternatively… to use a bunny.net storage zone as origin'). However, it never explicitly states when to prefer this tool over bunny_create_video_library or bunny_create_storage_zone, nor does it name the siblings for updating /deleting an existing pull zone. The usage guidance is implied rather than explicit.

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