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

Annotations already declare readOnlyHint, idempotentHint, non-destructive and closed-world, so the safety profile is covered. The description's only added value is naming the returned concepts (price, monthly quota, limits), which matters because there's no output schema, but it says nothing about ordering, scope of results, or that organizationId restricts the listing.

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?

It is short with zero waste, but it is not a sentence — no verb, no front-loaded statement of action — so brevity here reflects under-specification rather than tight structure.

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?

No output schema exists and the description never says what a call returns (all available plans vs. the current subscription) or that organizationId is optional. For the only entry point to plan/pricing data in this toolset, that omission leaves real ambiguity.

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 single parameter already carries 'Approved workspace id only,' so the schema does the work. The description adds nothing about how organizationId scopes which plans are returned. Baseline 3 for high coverage.

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 fragment 'Plans with price, monthly quota and limits' identifies the resource and hints at the fields returned, but supplies no verb and no scope (all plans? the org's current plan?). Against siblings like billing_status, upgrade_plan and manage_subscription, it doesn't clarify which is being listed.

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 when-to-use guidance and no mention of alternatives. An agent choosing between list_plans, billing_status and upgrade_plan gets no routing signal at all.

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