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

No annotations are provided, so the description carries the full behavioural burden. It does disclose one useful edge case (empty or missing pattern matches every line) plus a pricing/trial note, but omits case sensitivity, whether matching is literal or regex, how the four near-duplicate input parameters interact, and what the response looks like. For a tool with zero annotation coverage this is a significant shortfall.

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?

Two compact clauses with the core behaviour front-loaded, followed by the edge-case rule and the x402 cost note. Nothing is padded, though the emoji trial-pricing fragment is more marketplace boilerplate than tool semantics.

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 four undescribed parameters, no annotations, and no output schema, so the description is the only source of guidance — and it leaves the parameter model and return format unexplained. Adequate to understand the intent, insufficient to invoke it 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?

Schema description coverage is 0% and the description only implicitly names 'pattern'. Critically, it does not resolve the ambiguity among the four undocumented aliases (text, input, search, pattern) — an agent cannot tell which string is the haystack, which is the needle, or whether they are alternatives for the same value. The required-parameters list is also empty, so the description needed to compensate here and does not.

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+resource: returns the lines of text that contain a pattern substring. It is behaviourally precise about its own scope (which lines are returned), though it never names or contrasts with the many near-siblings that do similar line/text search work (x402-grep-lines, x402-find, x402-words-containing, x402-contains-any).

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 and no mention of alternatives, prerequisites, or when this tool is the wrong choice versus grep-lines or find. Usage must be inferred entirely from the name and the one-sentence behaviour statement.

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