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

Annotations already declare readOnly, idempotent, non-destructive, and openWorld, so safety is covered. The description adds genuinely new context: 'Keyless' (no auth required), 'newest first' ordering, and what fields each vendor row surfaces. It does not mention pagination or rate limits, but that is a minor gap given the annotation coverage.

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?

Purpose and scope are front-loaded in the first sentence, followed by routing guidance and return shape. The two inline call examples duplicate the input schema's examples field, which is mild redundancy, but overall the text is dense and earns most of its length.

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?

There is no output schema, so the description correctly compensates by describing the return shape (which vendors shipped, change counts, latest headline per vendor) and ordering. Combined with annotations and 100% schema coverage, an agent has what it needs to invoke it correctly; only pagination behavior is unaddressed.

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%, so defaults and maxes for days, limit, and domains are already documented in the schema. The description reinforces domains as a target-list narrowing mechanism and shows usage in examples, but adds little semantic detail 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 and resource ('sweep ... shipping activity across every tracked software vendor'), including scope ('across every tracked vendor at once, newest first') and the exact question it answers. An agent can distinguish it from vendor_recent_changes and vendor_coverage, which target single-vendor and coverage use cases.

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?

Explicitly frames the intended use ('prospecting and account prioritisation') versus the excluded use ('rather than researching one company'). It does not name the specific sibling tool to use for single-company research, so the routing is implied rather than fully specified.

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