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

With no annotations, the description carries the burden of disclosing behavior. It explicitly states that this is a full overwrite, not a partial patch, which is a critical destructive trait, and it mentions the return value ('Returns the updated API test and its state'). This goes beyond a bare mutation description.

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 three sentences, front-loaded with the action, then a critical caveat, and a return-value note. Every sentence adds value—no filler or redundancy.

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 tool has 27 parameters and no output schema or annotations, so the description needs to add context beyond the schema. It covers the core behavior (full overwrite), parameter handling guidance, and return value. While it could include an example or error conditions, the provided context is sufficient for selecting and invoking the tool correctly.

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%, so the baseline is 3. The description adds meaningful semantic guidance by clarifying that because this is a full overwrite, every field intended to be kept must be supplied. It also points to create_api_test for parameter details, helping the agent understand the parameter set without repetition.

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+resource ('Replace the entire configuration of an existing API test') and clearly distinguishes itself from sibling tools like create_api_test by focusing on updating an existing test. The scope is unambiguous.

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 provides clear context—this is for updating an existing API test via apiTestId—and emphasizes that it is a full overwrite, so users must pass all fields they want to keep. It does not explicitly list alternatives or when not to use it, but the context is clear and useful.

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