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

With no annotations at all, the description carries the burden and delivers: it discloses sort order ('most used first'), aggregate fields ('packages is how many videos were read, skipped how many had no structure'), the outlier_score range, and the cost profile ('Free'). What it does not state explicitly is that this is a pure read with no side effects, and it doesn't mention any limits on result size.

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?

The description is compact and front-loads the resource ('Your swipe file'), then enumerates fields. It is slightly cluttered by nested parentheticals like '(how many of those videos use it, one a video)' and the dangling 'packages/skipped' explanation, but almost every sentence carries information.

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 already exists, so the description need not enumerate return values, yet it still adds ordering, aggregation semantics, and cost. With one optional auth parameter and no risky behavior, nothing material an agent needs to invoke it correctly is missing.

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?

There is a single parameter (api_key) with 0% schema description coverage and a null default, and the description never addresses it, leaving unclear whether it is required or how a null value behaves. Since it is only the conventional auth parameter, this is a modest gap rather than a damaging one.

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 definition names a specific resource (the swipe file of kept/filed Packaging finds) and the exact shape of what it returns: title_template with title_device, count, and best example. It is clear enough to distinguish from generic list tools, though it never names a sibling like list_keeps or find_packaging to disambiguate further.

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: the reader infers you call this to retrieve the aggregated swipe file of title structures. There is no explicit when-to-use vs when-to-use-something-else guidance relative to siblings such as list_keeps, list_kept_finds, or find_packaging. The 'Free' note and 'Same as GET /v1/swipe' mapping are useful context but not routing guidance.

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