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

The description discloses a key behavioral trait: determinism and daily consistency ('same all day'). However, with no annotations provided, it fails to state whether the operation is read-only, how the seed parameter affects results, or any auth/rate-limit considerations.

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 a single concise sentence with no fluff, but it is under-specified. It front-loads the core concept but omits necessary details, making it more vague than appropriately sized.

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?

Given the absence of output schema and annotations, the description should provide more context about return values, seed semantics, and how it relates to sibling card tools. It only hints at determinism and leaves the meaning of 'the keeping' unexplained.

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 input schema lists a single optional 'seed' parameter with no description, and the tool description does not mention 'seed' at all. With 0% schema coverage and no explanation in the description, the agent cannot infer the parameter's purpose or syntax.

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 phrase 'deterministic card of the day' identifies the tool's purpose as retrieving a daily card, which is distinct from sibling tools like card_get or cards_browse. However, it lacks an explicit verb (e.g., 'returns') and uses the domain-specific term 'the keeping' without explanation.

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 provides no guidance on when to use this tool instead of alternatives like card_get or cards_browse. It only states what it does, not when to prefer it or what prerequisites exist.

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