create_a_custom_field_group

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

The description explicitly states 'Not idempotent — calling twice may create duplicates', which adds practical behavioral context beyond the idempotentHint=false annotation. The 'WRITE' badge also clarifies mutability. However, it does not discuss permissions or side effects beyond duplication.

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 very concise with two short sentences plus a header line. It front-loads the key information (WRITE, create, not idempotent) and avoids unnecessary words, though it could benefit from structured sections for clarity.

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?

The description is adequate for a simple create operation but lacks information about response format or return value. Given no output schema, the agent may need to know what is returned (e.g., ID of created group). The nested 'body' object is noted but not explained further.

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?

With 100% schema description coverage, the input schema already documents all parameters. The description adds no additional parameter details beyond the HTTP method and resource path, so it provides no added semantic value beyond the schema baseline.

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 it creates a custom field group, with a '🟡 WRITE' badge, 'creates data' label, and explicit 'Create a Custom Field Group' heading. It distinguishes from sibling tools like 'create_a_customfieldmeta' by specifying the 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?

The description provides no guidance on when to use this tool versus alternatives. It does not mention prerequisites, typical scenarios, or when not to use it, leaving the agent to infer from the name only.

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