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

Annotations already declare readOnlyHint, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description adds useful scope (this user only, cards plus sealed, CSV output) but says nothing about volume limits, row/column shape, or whether sealed and card rows are interleaved.

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 terse fragments, front-loaded with the format and resource, with zero filler. The telegraphic style is efficient but borders on under-specification rather than full clarity.

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?

For a simple read-only export with no output schema, the description covers format and scope adequately but leaves the two filter parameters and the resulting CSV structure undescribed. It is minimally sufficient rather than complete.

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 the description never mentions the two parameters (game, language). With both params undocumented in the schema and unaddressed in prose, the agent must guess defaults and accepted value formats.

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?

"CSV of THIS user's binder (cards + sealed)" names the output format, the resource, and the exact contents in one clause, and "Not a catalog dump" explicitly separates it from catalog-style siblings like lookup_card or collection_search. An agent can select it without opening the 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?

"Owner-only" gives a clear precondition and "Not a catalog dump" gives an explicit when-not-to-use signal. However, no alternative sibling is named for the excluded catalog case, so the routing guidance stops just short of the top band.

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