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

Annotations already declare readOnly, idempotent, non-destructive, closed-world, so safety is covered. The description adds genuinely useful behavioral context beyond that: results are deduplicated to one per archetype, ordered closest-first, and include ownership totals, missing cards and finish cost.

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 dense sentence with the resource and result shape front-loaded and no wasted words. Every clause (archetype dedup, sort order, ownership/missing/cost) 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, so the description correctly carries the return-value burden by naming ownership count, missing cards and completion cost. It is only slightly short on how limit/format/source affect the result and whether collection coverage is required.

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 a moderate 67% and the description mentions no parameters at all. format and source are self-documented in the schema, but limit (the one parameter with no schema description) gets no clarification, and nothing indicates how limit interacts with the one-per-archetype result set.

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 resource and scope: tournament/meta decks the signed-in user can nearly complete from their collection, deduplicated one per archetype and sorted closest-first. This clearly separates it from siblings like my_decks (user's own decks) and get_meta_deck (a single known deck) without needing to name them.

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 when it applies (discovering near-complete meta decks), but there is no explicit when-to-use, when-not-to-use, or routing to alternatives such as get_meta_deck or get_meta. Usage is inferred rather than stated.

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