scryfall_whats_new

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

Annotations declare readOnlyHint, openWorldHint, idempotentHint, which already cover safety and idempotency. The description adds no additional behavioral details beyond the basic operation (searches Scryfall for recent cards). No contradictions.

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?

Extremely concise: two sentences front-loaded with purpose. No fluff or redundant information. Every sentence adds value.

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?

With full schema coverage and annotations, the description is sufficient for a straightforward read-only tool. It doesn't explain the output format, but given the tool's name and sibling context (e.g., scryfall_search_cards), the return values are predictable. A more complete description could mention output structure, but not strictly necessary.

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 100% with all parameters described. The description mentions 'optional filter by set or format legality' which corresponds to format and set_code, but adds no meaning beyond the schema. Baseline 3 as per guidelines.

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?

Description clearly states the tool's purpose: finding recently printed/released Magic cards. It specifies the resource (Scryfall), the action (search within days), and optional filters. This distinguishes it from siblings like scryfall_search_cards which don't focus on recency.

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 when to use (for recent cards) but does not explicitly contrast with alternatives or state when not to use it. The sibling tools include many search tools, but no exclusionary guidance is provided.

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