Create Key Value instance

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

Annotations already declare readOnlyHint=false, destructiveHint=false, and openWorldHint=true, so the create behavior is known. The description adds the API call detail and a key caveat: the connection string is not returned by list/retrieve, requiring a separate credential lookup. No contradictions 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?

The description is moderately concise but includes redundancy: 'Create Key Value instance.' and 'Create a new Key Value instance.' say the same thing. The remaining sentences (API endpoint, Redis-compatible note, credential guidance) are useful, but the duplication pads the text unnecessarily.

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?

There is no output schema, and the description does not describe the return value or prerequisites for creating an instance. It provides useful context about credential retrieval and the Redis-compatible nature but falls short of explaining the full behavior of a create operation, such as what the response contains or what resources are provisioned.

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 coverage is 63%, with descriptions for name, region, maxmemoryPolicy, persistenceMode, and ipAllowList. The description adds no parameter-specific guidance and does not compensate for undocumented parameters like plan and environmentId. It neither clarifies nor obscures, thus meeting baseline but not adding value.

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 purpose: 'Create a new Key Value instance.' It also specifies the API endpoint (POST /key-value) and differentiates from siblings by explaining that Key Value is Render's Redis-compatible store superseding deprecated Redis endpoints, which is a unique resource type.

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?

It gives usage context: 'Key Value is Render's Redis-compatible store and supersedes the deprecated toolset's Redis endpoints,' indicating it should be used over deprecated Redis tools. It also provides a follow-up action: read credentials with render_retrieve_key_value_connection_info since the connection string is not returned by list or retrieve. However, it lacks explicit exclusions or alternatives beyond the deprecated toolset.

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