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

Annotations already cover the safety profile (readOnly, idempotent, non-destructive). The description adds real value beyond them: per-asset-type return content (thumbnails/frames vs. name/type/size) and MCP Apps gallery behavior. It does not mention behavior for invalid IDs or workspace mismatches, which keeps it from a 5.

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 sentences, front-loaded with the core return behavior, followed by conditional per-type details and a pointer to the alternative. Every sentence earns its place.

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?

There is no output schema, yet the description explains what is returned for each asset type, which is the key unknown for this tool. Combined with complete parameter docs and rich read-only annotations, an agent has everything needed to call it correctly.

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 100%, with both parameters fully described and the four-item cap enforced by maxItems. The description reiterates 'up to four' and 'from one workspace' but adds no format or syntax detail beyond the schema, so the baseline 3 is appropriate.

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?

Specific verb + resource + scope: 'Returns compact previews of up to four stored assets from one workspace.' It is clearly distinguishable from fuzz_get_asset and fuzz_download_asset, and the explicit reference to fuzz_download_asset for originals reinforces the boundary.

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 description states the context (quick previews) and explicitly names the alternative for full files: 'Original files are available through fuzz_download_asset.' However, no explicit when-not condition or error-handling guidance is given, 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.