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

With no annotations, the description carries the full burden. It usefully discloses that the call uses the caller's OpenAny gateway credentials and that charging and authorization are decided by the gateway. It does not say whether this call itself consumes points, whether it can fail for insufficient balance, or what the response contains.

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 short and front-loads the action. The parenthetical "(0 points, placed last)" is cryptic and looks like an artifact of the source API doc, so it costs space without adding usable meaning.

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?

There is no output schema, so the description should explain what a balance response includes (total points, expiring points, account identity). It says nothing about return values. For a balance-check tool that agents will call to decide whether to spend points, that is a real gap.

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 100%, and the nested expiringWindowDays field is documented thoroughly in the schema, including defaults, range and concrete user-intent mappings. The description adds nothing beyond the schema, so the baseline of 3 applies.

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 states a specific verb and resource: "Query points balance". That is enough for an agent to know it is a read of the caller's point balance. However, the sibling pkulaw_post_account_get_points_balance appears to do the same thing, and the description never differentiates the two, so the agent cannot choose between them from the text alone.

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 explicit when-to-use or when-not-to-use guidance, and the near-duplicate account sibling is not mentioned. The only context offered is that charges and authorization come from the gateway, which describes the plumbing rather than the situation that should trigger this call.

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