list_kv_namespaces

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

No annotations are provided, so the description carries the full disclosure burden. It does state that this is a non-mutating read operation ('List'), which is useful, but it adds no further behavioral context such as pagination, response shape, or account-level requirements beyond the schema. This is minimally adequate for a simple list tool but not rich.

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 one short sentence with no filler. It front-loads the verb and object and every word contributes to understanding, making it an appropriately concise definition for a one-parameter list tool.

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 one-parameter read-only list with no output schema, the description supplies the core selection and invocation information. It could be improved by noting what the response contains or whether pagination applies, but the essential details needed to call the tool correctly are present.

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 input schema already documents account_id with 100% description coverage, and the description adds no additional parameter-level meaning beyond restating the account scope. The schema does the heavy lifting, so baseline 3 is appropriate.

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 uses a specific verb 'List' with a concrete resource 'Workers KV namespaces' and scopes it to 'in an account'. This clearly identifies the operation and distinguishes it from sibling tools such as list_kv_keys and get_kv_namespace, which target different resources.

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 provides no explicit guidance about when to use this tool versus alternatives. It does not mention that list_kv_keys should be used for enumerating keys or get_kv_namespace for a single namespace, so an agent has no routing information beyond the resource name.

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