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

With no annotations, the description carries the full burden, but it does disclose the key transformation rule: the first row is treated as the header. It says nothing about what happens to ragged rows, delimiters, quoting, or the exact output shape, so it is only partially transparent for a mutation-free formatter.

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 functional sentence is short and front-loaded, which is good. The trailing "🆓 5 free trial calls per signed wallet" is promotional noise that does not help the agent select or invoke the tool.

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?

No annotations, no output schema, and zero parameter coverage, so the description is the only source of information — yet it omits parameter meaning, input encoding, and edge-case behavior. For a 2-parameter formatting tool this leaves meaningful gaps.

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 both parameters are bare strings. The description loosely maps to a "2D array" input but never explains the difference between the `data` and `rows` parameters, nor the expected serialization (JSON string? delimited text?) — the agent cannot reliably populate either field.

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?

Names a specific verb and resource: "Formats a 2D array as an ASCII table," plus the header convention (first row). That is enough for an agent to know exactly what the tool produces. It does not, however, distinguish itself from near-neighbors such as x402-markdown-table or x402-csv-build.

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 conditions, and no mention of alternatives in a sibling set that contains several table/CSV/markdown formatters. The agent must guess whether this is the right formatter for its output format.

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