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

No annotations are provided, so the description carries the full behavioral burden. It does disclose the return shape ("match type and count") and the billing model ("5 free trial calls per signed wallet"), which is real value. It stops short of stating detection limits, false-positive behavior, input-size constraints, or that the operation is a safe local read.

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?

One front-loaded sentence covering scope and return value, plus a short pricing tag. No filler or redundancy, though the emoji-prefixed trial note is slightly noisy relative to the rest.

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?

With no output schema, describing the return as match type and count is helpful and needed. With no annotations and an ambiguous duplicate-parameter schema, the description should have clarified inputs and any limits; it partially covers outputs but leaves the input side under-specified.

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 description coverage is 0% and the two parameters ("text" and "input") are undocumented and semantically overlapping. The description's word "text" hints at one of them but nothing explains the duplicate "input" parameter or which one takes precedence, leaving a real ambiguity for the caller.

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 states a specific verb and resource ("Scans text for private key headers, password assignments, JWT tokens and long secret assignments") and even names the output ("match type and count"), so the agent knows exactly what it does. It does not, however, differentiate itself from the closely related sibling x402-api-key-detect, which is a near-neighbor in this large tool family.

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 when-to-use guidance, no exclusions, and no mention of alternatives. The reader cannot tell whether this supersedes or complements x402-api-key-detect, x402-password-leak, or x402-redact, all of which overlap in intent.

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