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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false, so the safety profile is covered; the description adds real behavioral context beyond that. It pins the reporting window to 7 days (a fixed, non-configurable window), discloses that page speed includes a per-deploy marker only 'when that is switched on', and notes that a plan cap note may appear, plus the projects:read scope requirement.

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?

It is short and contains no filler, but it is a single comma-spliced list of dashboard widgets with no verb and no front-loaded statement of what the tool does, making it harder to parse than a two-sentence structure would be.

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?

For a read-only tool with no output schema, listing the contents of the returned summary (visitors, events, funnel, cap note, page speed) is genuinely useful so the agent knows what it is getting. The main residual gap is that it does not say the 7-day window is fixed and non-parameterizable, which an agent might otherwise assume it can control.

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%: each of the three optional parameters documents its default (production branch, last-used project, token organization). The description adds nothing about parameters, which is acceptable given the schema already carries that meaning, so the baseline of 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?

The description enumerates what the summary contains (visitors, events, sign-up funnel, plan cap note, page speed with per-deploy markers) but is a verbless noun phrase, so it never states the action it performs. It gives no differentiation from plausible siblings such as metrics.get, insights.get, or usage.get.

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?

There is no when-to-use guidance and no named alternative, despite several sibling tools (metrics.get, insights.get, usage.get) that an agent could easily confuse with this one. The only routing-adjacent information is the 'Scope: projects:read' permission note, which tells the agent about authorization rather than when to call this tool.

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