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

Annotations only state readOnly=false, idempotent=false, destructive=false. The description adds substantial context well beyond them: the record is written into the customer's own Cloudflare account and affects real traffic, duplicates are refused (consistent with idempotentHint=false), and created records are stamped 'Managed by Ankra'. It also repeats 'Managed by Ankra' with a user-confirmation requirement, which is meaningful operational guidance.

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?

Four tight sentences, front-loaded with the action and the confirmation requirement, then the naming rules and duplicate check. Some content duplicates the schema (name forms, comment default), which costs a little, but there is no 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?

For a 9-parameter mutation with no output schema and a low-bar annotation set, the description covers side effects, prerequisites, naming rules, and failure modes well. It stops short of stating what a successful call returns or the credential/permission requirements, though credential_name is documented in the schema.

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 documents all nine parameters including the name forms and the comment default. The description largely restates the name-qualification rules ('bare label', 'fully-qualified', '@' apex) and the 'Managed by Ankra' default rather than adding new semantic detail, so the baseline 3 applies.

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 verb and resource – 'Create a DNS record in one of the organisation's Cloudflare domains' – and scopes it clearly against the sibling DNS tools (list/update/delete). An agent immediately knows this is the creation path and which resource family it touches.

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?

Explicit conditions: confirm the domain and content with the user first, and call list_cloudflare_dns_records beforehand to check the name is not already taken because Cloudflare refuses an exact duplicate. It also names a when-not case (a name outside the domain is refused), leaving nothing to inference.

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