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

Annotations already declare readOnly, idempotent, non-destructive, closed-world behavior, so the safety profile is covered. The description adds genuinely new context: that the policy is versioned and 'current', and that it is publicly readable (no auth required), which the annotations do not express.

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?

A single front-loaded sentence with no filler; the enumeration of policy contents is the substance of the description rather than padding. It could be trimmed marginally but nothing is wasted.

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 parameters, the description is the only signal of what comes back, and it supplies that by listing the policy facets. What is missing is any hint of the return shape (single document vs. fielded object) and pagination or version-selection behavior.

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 tool takes zero parameters, so there is nothing for the description to disambiguate and the baseline is 4. The schema's additionalProperties=false is consistent with a no-input lookup and nothing in the description conflicts with it.

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 names the resource precisely as the versioned reserve policy and enumerates what it contains (caps, bidding window, minimum competing bidders, probation limits, standing requirements). It is distinguishable from siblings like jey_standing or jey_economy_stats, though the retrieval verb is only implicit and no sibling is named as an alternative.

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?

There is no statement of when to call this versus jey_standing or jey_economy_stats, nor of prerequisites. 'Public' hints that no authentication is required, but that is a property of the resource rather than usage guidance, so the agent must infer when this lookup is appropriate.

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