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

The readOnlyHint annotation already signals a safe read operation. The description adds that the deck includes all cards, which is helpful, but it does not cover error behavior, return format, or how a missing deck is handled. Minimal behavioral detail beyond the annotation.

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?

One sentence, front-loaded, with no fluff. Perfectly concise and well-structured.

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 one-parameter read-only fetch with good annotations, the description is sufficient. It tells the agent the key fact (all cards are included) and the required id. No output schema exists, but the description doesn't need to explain return values extensively for such a straightforward operation.

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?

The schema fully describes the single parameter deckId as 'Flashcard deck ID', and the description's 'by id' aligns with this. The description adds no additional semantics beyond the schema, so the baseline score of 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?

The description clearly states the action ('Fetch'), the resource ('flashcard deck'), and the scope ('by id'), and explicitly mentions it includes all cards. This differentiates it from sibling tools like quiz_video_list_flashcard_decks (which lists decks) and create/delete variants.

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 implies use when you have a deck ID and need the full deck contents, but it does not explicitly contrast with alternatives such as quiz_video_list_flashcard_decks or other get tools. The 'by id' qualifier gives some context, but no when-not-to-use guidance is provided.

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