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

Annotations already declare readOnlyHint/idempotentHint/non-destructive, so the safety profile is covered. The description adds real behavioral context beyond that: newest-first ordering, the fields each item carries (id, name, source), preview inclusion, and the empty-result note. It stops short of mentioning pagination or result 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?

Front-loaded with purpose, then scope, then return content, then the preview and empty-state caveats. Sentences are dense but each carries information; the repeated 'For the person's own uploads' phrasing is mildly redundant with the opening clause.

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?

With no output schema, the description responsibly covers return contents, ordering, preview behavior, and the empty case for a simple two-parameter read tool. Pagination or result-count limits are the only meaningful omission.

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 both parameters are already documented. The description restates the enum values ('pictures', 'sounds') and the previews=false behavior without adding syntax or format detail beyond the schema, matching the baseline 3.

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 ('Lists the person's own uploads') and immediately scopes it against alternatives by noting that LFG's library and KLIPY GIFs are separate searches. An agent can distinguish this from search_library and search_gifs without opening any schema.

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?

It gives clear context for when to use it (the person's own uploads) and excludes the alternative sources (library, KLIPY GIFs) as separate searches. It does not name the sibling tools explicitly nor state any prerequisites, so it falls short of a full 5.

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