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

No annotations are supplied, so the description carries the full behavioral burden. It does usefully disclose that the caller's OpenAny gateway credentials are used and that charges/authorization come from the gateway, which is real value. However, it says nothing about read-only nature, pagination semantics, or result ordering/size limits.

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?

Three short sentences, front-loaded with the purpose and followed by the output caveat and the billing note. Nothing is redundant, though the gateway sentence could be tighter.

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 9-parameter tool with 7 required fields and no output schema, the description covers purpose, output composition, and billing/auth. It leaves pagination behavior and the practical cap on results to the schema, which is adequate but not fully complete.

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 100%, so every parameter including continue and elcontinue is documented in the schema. The description adds no parameter-level meaning beyond what the schema already states, so the baseline 3 applies.

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: 'List URLs in an English Wikipedia article that point to external sites.' An agent can immediately tell this extracts external links rather than revisions, backlinks, or page titles. It does not explicitly contrast itself with the closest siblings, which keeps it from a 5.

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?

Usage is only implied by the purpose statement — there is no explicit when-to-use or when-not-to-use guidance and no named alternative. The note that results 'may include references and other external links' sets expectations but is not routing guidance.

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