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

With no annotations, the description carries the full behavioral burden. It usefully discloses the auth requirement ('No key', PUBLIC) and the row-level payload (provider contact email, sendable asset code, price), but says nothing about pagination behavior, result volume, or rate limits despite a limit parameter existing.

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 compact, front-loaded sentence that leads with the resource and appends the access constraint. The parenthetical is dense but informative; the 'No key.' fragment is terse yet earns its place by answering an implicit auth question.

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 output schema and no annotations, so the description must do more. It partially covers the return shape (row fields) and access model, but omits pagination limits, expected volume, and any distinction from sibling catalog tools — leaving meaningful gaps for a catalog-listing tool.

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 50%. The 'fields' parameter is thoroughly documented in the schema, but 'limit' has no description at all (no default/max explanation), and the description never mentions either parameter or the pagination semantics implied by limit. The description does not compensate for the undocumented 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?

The description names a specific resource — the public cross-provider services catalog — and clarifies its scope as public/no-key, which helps distinguish it from authenticated siblings like uxc_get_market or uxc_get_order. However, it never explicitly contrasts itself with retrieval siblings such as uxc_search_catalog or uxc_lookup_products, so the agent must infer the difference.

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?

The phrase 'No key' implicitly tells the agent this works without authentication, but there is no explicit when-to-use guidance or mention of alternatives (search_catalog, lookup_products, get_market). The agent is left to guess when this catalog is preferable to the other catalog-reading tools.

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