Create Key Value instance

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

Annotations already indicate that this is a write operation (readOnlyHint=false) and non-destructive. The description adds only the API endpoint. It does not disclose additional behaviors such as whether the operation is idempotent (already false), any rate limits, or what happens to existing resources with the same name. Since annotations cover the safety profile, the description adds minimal value.

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 short but contains redundant phrases: 'Create Key Value instance' and 'Create a new Key Value instance' essentially say the same thing. It could be condensed into a single sentence, e.g., 'Create a Key Value instance via POST /key-value.' The front-loading is okay, but every sentence should add value.

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 has 8 parameters, 3 required, and no output schema, the description does not explain the return value (e.g., the created instance details) or side effects (e.g., costing). It is minimal and leaves the agent with incomplete information. Sibling tools like render_create_postgres may have more descriptive text. This description lacks completeness for a complex creation 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?

The input schema has 63% description coverage, so many parameters are already documented. However, the description itself does not explain any parameters or their semantics. For example, 'persistenceMode' has a schema description, but its implications could be clarified. The description does not compensate for the 37% of parameters lacking schema descriptions, such as 'environmentId'.

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 the action (Create) and the resource (Key Value instance), and distinguishes this from sibling tools like render_update_key_value or render_delete_key_value. The verb+resource combination is specific. However, the repetition of similar sentences slightly detracts but does not obscure the purpose.

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 guidance on when to use this tool versus alternatives. It does not mention prerequisites, when to choose this over other creation tools (e.g., render_create_redis), or any context for decision-making.

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