create_topic

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

No annotations are provided, so the description carries the full burden. It discloses the HTTP method and domain-first ownership, but does not mention return values, idempotency, permission requirements, duplicate behavior, or whether the sending domain must be verified before creating a topic.

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 two concise sentences with the core action and route front-loaded. The second sentence repeats enum constraints already present in the schema, making it slightly redundant, but overall it remains scannable and free of filler.

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 schema covers required fields and gives good descriptions for name and domain, and the description covers the remaining enums. However, with no output schema and no annotations, the description omits response behavior, error cases, and domain verification requirements, which would be valuable for a create operation.

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 only 40%, and the description adds explicit valid values for default_subscription and visibility. However, it does not explain the meaning of default_subscription, the purpose of the free-text description parameter, or any constraints on name/domain beyond what the schema already states.

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 action ('Create') on a 'subscription topic' tied to a 'sending domain', and includes the exact endpoint 'POST /topics' plus the 'domain-first' model. This clearly separates it from sibling tools such as list_topics, get_topic, update_topic, and delete_topic.

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 create verb and resource type imply when to use this tool, but there is no explicit when-to-use/when-not-to-use guidance or mention of alternatives. It does not state prerequisites like needing a valid sending domain, which would help an agent decide between this and update_topic.

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