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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false, and openWorldHint=false, so the safety and idempotency profile is covered. The description adds the scoping constraint via the days lookback window, but does not disclose pagination behavior or rate limits. With annotations doing the heavy lifting, a 3 is appropriate.

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?

Well-structured with clear sections for purpose, views, and args. It is front-loaded and every sentence adds value. Slightly verbose in the activity feed elaborations but acceptable.

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?

Given annotations, schema, and no output schema, the description is mostly complete. It covers the tool's purpose, views, and key arguments. The omission of the user_intent parameter and lack of return format details are minor gaps, but for a read-only tool they are not critical.

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 only 14%, so the description must compensate. It does so for most parameters by listing them with constraints (e.g., days 1-180, limit 1-200, event_type exact match). However, it does not mention the user_intent parameter or the required brand_id beyond a parenthetical, leaving some gaps.

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 ('Read the in-product activity feed for the brand') and elaborates on what the feed contains. It distinguishes itself from siblings like get_actions or get_changes by framing the feed as the unified event timeline and providing the answerable question.

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 a clear context ('Use this to answer what's happened with my brand lately?') and explains the two views with their filtering conditions. It doesn't explicitly exclude or name an alternative sibling, so it falls short of a 5.

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