free_tier_status

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

With no annotations, the description carries the burden of disclosing behavior. It implies a read-only status check by its name and phrasing, and adds useful context about the tool's purpose in revealing charges that are otherwise unnoticed. However, it does not explicitly confirm safety, discuss permissions, or mention any limitations or edge cases.

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-loaded with the core purpose in the first sentence. The second sentence adds motivational context rather than redundant detail, so it earns its place. It is not overly verbose or repetitive.

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?

The tool is simple (1 optional param, no required params) and an output schema exists, so the description need not detail return values. However, the unexplained 'profile' parameter and lack of explicit behavioral notes leave gaps. It is adequate but not fully complete for an agent to use without guessing.

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 one optional 'profile' parameter with 0% description coverage, and the description does not mention the parameter at all. Since the description fails to compensate for the complete lack of schema documentation for this parameter, it provides no added meaning beyond the raw schema.

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 reports free tier allowances and current account proximity to each limit, which is specific enough to distinguish from siblings like what_is_wasting_money or capabilities. However, it lacks an explicit verb like 'get' or 'list' and does not directly contrast with sibling tools.

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 provides a concrete scenario ('Not in the bill, so a charge sitting just over an allowance is invisible without it') that explains when this tool is valuable. It gives clear context for use, though it does not explicitly name alternatives or state when not to use it.

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