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

With no annotations provided, the description carries the full burden of behavioral disclosure. It states that the body is discarded, but it does not specify what the tool returns (e.g., boolean, error), any side effects, or prerequisites. This is insufficient for an agent to know how to handle the result.

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 extremely concise (one sentence), which is positive, but it omits critical information like return value and parameter mapping. It is not front-loaded with essential details beyond the basic purpose, so the conciseness comes at the expense of completeness.

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 9 parameters, no output schema, and no annotations, the description is grossly incomplete. It does not explain the role of the other parameters, what the tool returns, or when it should be used. An agent would be unable to call this tool correctly with confidence.

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?

Although the schema describes each parameter (100% coverage), the tool description introduces the term 'body' without mapping it to the 'json' parameter. This mismatch could confuse the agent, and the description adds no extra meaning beyond what the schema already provides. The schema descriptions are the only useful semantic source here.

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 ('Check whether') and the target ('valid JSON'), making the core purpose unambiguous. However, it uses the term 'body' which does not directly correspond to any parameter name in the schema (the schema has 'json'), creating a slight mismatch that could confuse an agent about which parameter to pass.

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 the many sibling tools (e.g., fetch-status, domain-shape). It does not mention any conditions, prerequisites, or alternatives, leaving the agent to infer usage context without support.

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