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

Annotations already cover the safety profile (readOnlyHint, idempotentHint, destructiveHint=false, openWorldHint=false), so little is needed here. The description adds what comes back — facts plus a snippet and an external regulations.ai link — which is useful but it says nothing about permissions, pagination, or failure modes when ids are missing.

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, no filler, with the cardinality constraint and return contents front-loaded. Every clause 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?

With no output schema, the description must carry the return shape and does so at a high level (per-regulation facts, snippet, full-comparison URL). It is nearly complete for a simple idempotent read, missing only edge-case behavior such as how it handles invalid or fewer-than-two ids.

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 description coverage is 100% and the single parameter is already documented as '2 to 5 regulation ids'. The description restates the same 2-5 constraint without adding format, ordering, or semantics beyond the schema, so the baseline 3 applies.

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 verb-resource pairing ('return regulations side by side') and the cardinality (2-5). An agent can distinguish it from the single-item 'get_regulation' or 'search_regulations' by the 'side by side' framing, though it never explicitly names a sibling.

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 the 2-5 range (use this to compare several regulations), but there is no explicit when-to-use, when-not-to-use, or routing to alternatives such as get_regulation or search_regulations.

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