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

No annotations are provided, so the description carries the full burden. It discloses key behavior: the schedule is persistent and runs even after the session ends, which is valuable. But it does not describe what happens on creation (e.g., whether a schedule ID is returned), any authentication requirements, or how to manage/stop the schedule. This is adequate but leaves gaps.

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 two sentences, with the primary purpose front-loaded. Every word earns its place, and there is no redundant or boilerplate text. It is concise and structured well.

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 the tool has 6 parameters and no output schema, the description provides an adequate high-level overview: what it does, when it runs, and the key inputs (URL, frequency, duration). It does not mention return values or error cases, but those are not expected without an output schema. The schema covers parameter details, so the description is reasonably complete for a scheduling creation tool.

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?

The schema has 100% coverage for parameters, so the baseline is 3. The description adds a high-level mapping ('how often' and 'how long') that aligns with interval_minutes and duration_days, but it does not provide any additional meaning or details beyond what the schema already states. No parameters are left unexplained, but the description adds minimal value here.

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 tool registers a persistent cron schedule, using a specific verb ('Register') and a clear resource ('persistent cron schedule'). It distinguishes itself from sibling tools (cancel_schedule, check_schedule, get_execution_history) by focusing on the creation/registration aspect.

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 implies usage for recurring tasks that continue after the session ends, which gives some context. However, it does not explicitly reference alternative tools (like check_schedule or cancel_schedule) or provide any when-not-to-use guidance. The use case is clear but not contrasted with siblings.

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