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

Annotations already declare readOnly, idempotent, non-destructive, so the safety profile is covered. The description adds useful behavioral context — that results carry a source scope and a capture time, and that provider results may be distinct from reporting availability (suggesting possible absence/staleness of data). That is real added value, though the phrasing is too cryptic to fully land.

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 short sentences with no padding, and the core purpose is front-loaded. The second sentence is the weakest part — obscure enough that it arguably costs more attention than the value it delivers.

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?

An output schema exists, so return values need not be explained, and annotations cover safety. But with a 3-parameter tool at 0% schema coverage and several similar report siblings, the description should clarify brandId/sourceId/days semantics and its differentiator; it does neither.

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 0%, so the description carries the full burden for three parameters. It vaguely gestures at 'source scope' (sourceId) and 'capture time' (possibly days, though days is a lookback window, not a capture time), and never mentions brandId or the allowed 7/30/90/365 values. It leaves most parameter meaning undocumented.

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 (Read) and a specific resource domain (GA4 or WordPress website reporting), which distinguishes it from the x_report and channel_report siblings. However, it never names those siblings or explains how this differs from get_performance_report or get_analytics, so an agent still has to guess among the report family.

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?

The word 'existing' hints that this reads already-captured reports rather than requesting new ones (request_channel_report, request_x_report), but that is inference, not guidance. No explicit when-to-use, when-not-to-use, or named alternative is provided, and 'Provider results and reporting availability remain distinct' does not tell the agent anything actionable.

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