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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the safety profile is covered externally. The description adds the ordering guarantee ('newest first') and the breadth of the feed, but says nothing about pagination behavior, result volume, or coverage windows — modest added value over the annotations.

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?

Two sentences, front-loaded with the resource and content, then the filter options. The parenthetical '(or a blend, meaning all its ingredients)' is slightly clunky but earns its place by clarifying a real ambiguity. No filler.

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 does the work of describing the return content (dated regulatory event types, newest-first) which is what an agent needs. It omits how many results come back by default and what an empty feed means, but the essentials for correct invocation are present.

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 the baseline is 3, and the description goes beyond it by explaining that passing a blend name returns events for all its ingredients and that filtering is optional/latest-first. That blend semantics is genuinely non-obvious and not inferable from 'Only this compound' in the schema.

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 concrete verb+resource ('Dated regulatory events from the Peptlas changelog') and enumerates the event types returned (advisory votes, list changes, comment deadlines, warning letters), so an agent knows exactly what comes back. It does not name or differentiate itself from the closely related siblings check_legal_status and status_in_place, which is the only thing keeping this below a 5.

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?

Gives explicit trigger phrasings ('Use it for "what changed" or "any news on BPC-157"'), which maps user intent to this tool clearly. It stops short of exclusions or routing rules — nothing says when to prefer this over check_legal_status for a status question.

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