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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is fully covered without description help. The description adds the ordering guarantee ("newest first") and clarifies that both announcements and releases count, which is useful. It says nothing about how many results come back by default or how filters combine, which are the remaining behavioral unknowns.

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?

A single sentence that front-loads the resource and scope, then the ordering. Nothing is wasted and no clause is 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?

With eight parameters, no required fields, and no output schema, the description is functionally adequate for calling the tool but leaves gaps: it never indicates what a result entry contains or how the filters interact. For a filtering tool with this many optional parameters, a short note on return contents would have been warranted.

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 88%, so nearly every parameter is already documented in the schema, including the days default of 7. The description restates the days default but adds no filter semantics (e.g., whether os/format are hard filters or how type accepts multiple tags). Baseline 3 is correct when the schema does the heavy lifting.

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 names a specific resource (audio plugins) and a precise scope: announced/released within the last N days, newest first. An agent can tell this is a recency/novelty listing rather than a general catalog search. It does not, however, explicitly differentiate itself from siblings like search_plugins or get_deals_ending_soon.

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 temporal framing ("last N days (default 7 = this week)"), which signals a browse-what's-new scenario, but there is no explicit when-to-use or when-not-to-use statement. No alternative sibling is named, so an agent must infer whether search_plugins with a date filter would be equivalent.

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