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

Annotations already declare readOnly/idempotent/non-destructive and open-world, so the safety profile is covered. The description adds real behavioral context beyond that: results are date-sorted newest-first, the source is keyless (no auth needed), each row links to the official CPSC page, and the scan window is bounded and configurable.

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?

Four compact sentences, front-loaded with the core action and sorting, then source, window, and link behavior. No filler, though the source is stated twice ('via SaferProducts.gov' and 'Data: CPSC/SaferProducts.gov'), which is slightly redundant.

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 two-parameter, no-required-input list tool with no output schema, the description covers what is returned, ordering, lookback behavior, source, and result linking. Only the exact result fields and whether the list paginates are unaddressed, which is minor.

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%, so both parameters (limit, lookback_days) are already fully documented with defaults and bounds. The description restates the configurable window and its 90-day default, adding marginal value but no new syntax or format detail, matching the baseline for high-coverage schemas.

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 states a specific verb and resource ('Return the most recent U.S. CPSC product recalls') and adds sorting semantics ('date-sorted, newest first'), which cleanly separates it from cpsc_recall_search. It does not name that sibling explicitly, so an agent still has to infer the boundary between 'recent' and 'search'.

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?

Usage is implied by 'most recent' plus the configurable lookback window, but there is no explicit when-to-use statement and no routing to alternatives such as cpsc_recall_search for keyword or product-specific lookups. Adequate but leaves the sibling choice to inference.

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