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

No annotations are provided, so the description carries the full behavioral disclosure burden. It discloses that the tool returns paginated results, requires an authenticated Proof account, and has a default filtering behavior. For a simple listing operation, this is meaningful context beyond the raw schema, though it does not detail rate limits or exact response shape.

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?

The description is compact and front-loaded, with no filler. The core purpose and default filter behavior appear first, followed by essential access notes. Every sentence contributes useful 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?

For a tool with five optional parameters, no required parameters, and no output schema, the description covers the essential operational context: pagination, archived-filter behavior, and authentication requirements. It is slightly light on what a 'Circle' is and does not describe the return shape, but the provided guidance is sufficient for an agent to make a reasonable first call.

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 parameter descriptions already explain page, limit, status, profile_id, and environment. The description's mention of archived-by-default behavior and pagination mostly restates information already present in the schema. It adds little semantic value beyond what the structured schema provides.

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 clearly states the verb and resource: 'List Circles with optional filters.' It also adds a scope detail (archived excluded by default) that helps clarify intent. However, it does not explicitly differentiate this tool from sibling tools like get_circle or list_circle_members, so it does not fully achieve the highest rating.

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 description gives clear context on when the tool is useful and how to handle archived circles: 'Archived Circles are excluded by default; pass status="archived" to surface them.' It also provides the required authentication prerequisite and warns that start_login does NOT open this tool. It does not explicitly compare against alternative list/detail tools, so it stops 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.