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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=true, so the safety profile is covered structurally. The description adds that the tool reports consumption counters against limits, which is mildly useful context, but discloses nothing about auth requirements, freshness/caching of the usage numbers, or rate limits. With annotations carrying the main burden, this is a baseline 3.

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 purpose is front-loaded in a single dense sentence with the when-to-use trigger following it; no sentence is filler. The parenthetical enumeration of limit categories is long but each item earns its place by telling the agent what limits it can rely on this tool to surface.

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 must carry the return-value burden, and it does: it lists plan, per-day execution counters, and every limit category with current usage, plus the upgrade recommendation. Combined with the annotations, an agent has everything needed to decide to call it and what to expect back.

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; the baseline for a 0-parameter schema is 4. The description correctly implies a no-argument call by never referencing any input.

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 a specific verb+resource and enumerates exactly what is returned: plan, today's executions used/remaining, plan limits, and upgrade target. It is unmistakably a read-only account snapshot. However, it never differentiates itself from siblings that overlap its content, notably get_risk_limits, get_trade_results, and get_upgrade_url, leaving the agent to infer why this aggregate view exists.

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?

"Check it before a multi-step task that could hit a limit" gives a concrete usage trigger that tells the agent when to call this versus just proceeding. It stops short of naming alternatives or exclusions (e.g., use get_risk_limits for detailed risk data), so it is clear context without routing.

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