Flipzi plan and allowance

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

Annotations already establish read-only, idempotent, open-world behavior, so the bar is lower. The description adds genuinely useful context beyond them: it costs 0 units and still works once the quota is spent, which is the key operational fact for an agent managing a usage allowance.

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?

Three short clauses carry the purpose, cost model, and invocation advice with no filler. The most actionable instruction ('call this first if unsure') is placed last for emphasis after the cost reassurance.

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, the description takes on the burden of describing the return by naming the three things it reports (plan, units used, unlocked tools). Combined with the zero-parameter schema, an agent has everything needed to call and interpret it.

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 the baseline is 4. There is no parameter surface for the description to explain, and it correctly does not invent one.

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?

It states a specific resource (the Flipzi plan/account) and enumerates exactly what is returned: plan, units used this month, and which tools the plan unlocks. This clearly separates it from the flipzi_list_*/get_* siblings, which all deal with cards, sets, or prices rather than account state.

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?

Explicit guidance is given in both directions: call it first when uncertain about capabilities, and it remains callable even when the allowance is exhausted. The agent knows both when to reach for it and why it is safe to do so early.

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