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

Annotations already declare readOnly, idempotent, openWorld and non-destructive, so the safety profile is covered. The description adds meaningful behavior beyond that: it is keyless, it returns published date/title/summary/URL, and crucially it distinguishes 'tracked-but-quiet' from 'not tracked at all', which an agent needs to interpret empty results correctly.

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?

Front-loads the resource definition and progressively adds usage context, return shape, and examples. It is on the long side and the trailing example calls partially duplicate the schema's examples block, but every sentence carries information.

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 usefully enumerates the returned fields and the quiet-vs-untracked semantic, and notes keyless access. What remains unstated is pagination/limit interaction with the days window and how results are ordered, though these are minor for this tool.

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 all three parameters (vendor, days, limit) are already documented, including defaults and maxes. The description reinforces the name-or-domain lookup and the CRM join rationale but adds no syntax or format detail beyond the schema, so 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: changelog entries, release notes and product announcements for a software vendor, with dates and source links. The purpose is unambiguous, though it does not explicitly distinguish itself from sibling tools like recent_changes, vendor_signal_sweep, or vendor_coverage.

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 concrete motivating contexts (account research, outreach timing) and example queries that map directly to intended use. It does not state when to prefer a sibling tool such as recent_changes or vendor_signal_sweep instead, so it stops short of full routing guidance.

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