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

Annotations already establish readOnlyHint=true, so the safety profile is covered. The description adds meaningful non-annotation context: owner-only access restriction, the test/unclassified segmentation, and that browser arrival/return figures are opt-in and coarse (i.e. aggregated/anonymized). It does not cover return format or any pagination/volume limits.

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 dense sentences, front-loaded with the resource type and audience before enumerating contents. Every clause carries information, though the second sentence is compressed to the point of slight opacity ('opt-in, coarse browser arrival and return counts').

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 reporting tool with no output schema, enumerating the report's constituent sections gives the agent a reasonable picture of what comes back. Missing only minor details such as time-range scoping or response shape, which are not critical given the absence of required parameters.

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% and the tool has a single optional parameter, so the schema fully documents the persistent agent scope and the omit-to-use-default behavior. The description adds nothing about account_ref, 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?

States a clear resource (owner operational activity report) and enumerates the specific content categories it aggregates: registered accounts, sessions, invoices, verified sales and feedback. This distinguishes it from single-purpose siblings like eclypse_feedback or eclypse_session, though it doesn't explicitly name a sibling it replaces.

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?

"Owner-only" implies the authorization prerequisite and therefore the audience, which is useful usage context. However, there is no explicit when-to-use vs. when-not-to-use guidance, nor any pointer to which sibling tool to call for a narrower slice of the same data.

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