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

With no annotations, the description carries the full burden. It implies a non-mutating inspection of headers and usefully discloses a rate/cost constraint ('5 free trial calls per signed wallet'). However, it does not say what happens with malformed input, whether it merely detects or also parses, or what the response contains.

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?

A single front-loaded sentence states the function, followed by the platform's pricing tag. Nothing is padded, though the trial-call note is boilerplate rather than task-relevant information.

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 low-complexity two-parameter check with no output schema, the description conveys the core intent and the specific headers examined. It still leaves the 'input' parameter unexplained and gives no indication of the return shape, which an agent needs to interpret results.

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 0% and neither parameter is described in the schema. The description explains the 'headers' input loosely, but calls it a 'headers object' while the schema types it as a plain string, and it says nothing at all about the 'input' parameter.

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?

States a specific verb and resource: 'Checks a headers object for forwarding headers,' and even names the concrete headers (x-forwarded-for, via, cf-connecting-ip). An agent can tell this apart from generic web tools like x402-http-headers, though the description never explicitly contrasts with those siblings.

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?

There is no statement of when to use this tool, when not to, or which sibling to pick instead. The only extra sentence is a pricing/trial note, which is billing information rather than usage guidance.

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