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

No annotations are provided, so the description carries the full behavioral burden. It discloses the 'open loops' scope (presumably excluding closed ones) but says nothing about ordering, pagination, result limits, or whether this is strictly read-only — gaps that matter for a list endpoint with zero annotation coverage.

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?

One sentence, no waste, and the filter condition is stated immediately after the resource. Nothing could be removed without losing 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?

With no output schema and no annotations, the description should say at minimum what a returned loop looks like or whether results are ordered/limited, and what the no-`before` default is. For a single-parameter read tool the gap is modest but real.

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 coverage is 0% — the schema only declares `before` as an untyped-format string. The description supplies both the format (ISO datetime) and the inclusivity semantics ('on or before'), which is exactly the value the schema lacks.

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?

Specific verb (List) plus resource (open loops) plus a filter condition (due on or before `before`). It is clearly distinguishable from the siblings get_loop (single fetch) and register_loop (create), though it never names them.

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 filter clause implies the use case (finding loops by due date), but there is no explicit when-to-use, no mention of alternatives, and no statement about what happens when `before` is omitted — the one parameter is optional, so the default behavior is left to inference.

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