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

Annotations already declare readOnlyHint=true and openWorldHint=false, so the safety profile is covered. The description adds that the catalog is 'live' and that returned slugs are 'valid', which is modestly useful, but it says nothing about whether results are paginated/truncated, how large the catalog is, or how search matching works. 'Live' also sits slightly at odds with openWorldHint=false, though this is interpretive rather than a contradiction.

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?

A single front-loaded sentence with no filler; the verb, resource, and illustrative output examples are all in the first clause chain. Nothing is redundant or padded.

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?

An output schema exists, so return values need not be explained, and the tool is a simple two-parameter read. Still, for a discovery tool the agent needs to know how 'search' filters and whether 'limit' implies truncation of a larger catalog; those gaps keep it at minimum viable.

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 (limit, search) carry only titles and defaults in the schema. The description uses the word 'Search' but never explains matching semantics (slug substring, name, case sensitivity) or what 'limit' truncates against. With low coverage the description should compensate, and it 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 ('Search') against a named resource ('the live MP4.now converter catalog') and clarifies the return type with concrete examples of valid slugs (mp4-to-mp3, mov-to-mp4). An agent can immediately tell this is a discovery/lookup tool, distinct from the conversion-execution siblings convert_image_url and get_conversion_status.

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 purpose implies usage (find a valid converter slug before invoking a conversion), but there is no explicit when-to-use or when-not statement, nor any reference to the sibling tools or to prerequisites. The agent must infer that this is the entry point for the workflow.

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