create_d1_database

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

Annotations already signal mutating (readOnlyHint=false) and non-destructive. Description adds key detail: the confirm gate and preview-until-execution behavior, which goes beyond annotations. No contradictions.

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?

Two concise sentences, front-loaded with purpose, followed by the critical constraint. No wasted words.

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 simple creation tool with rich schema and annotations, the description covers the essential behavior (creation, preview gate). It omits details on preview content or errors but is adequate for selection and invocation.

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 100% with parameter descriptions. The description enhances the confirm parameter by explaining its role as a human-approval gate for execution vs preview, adding meaning beyond the schema.

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 explicitly states 'Create a new D1 database' with a specific verb and resource. Among sibling tools, many create different resources (e.g., create_kv_namespace, create_r2_bucket), making the D1 database distinct.

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 indicates the confirm gate requirement and preview behavior but does not provide when-not-to-use guidance or mention alternatives like list_d1_databases. Usage context is implied rather than explicit.

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