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

Goes well beyond annotations: each call mints a distinct secret returned only once, it is not billed nor drawn from the Toolweather quota, and there is a 10-key per-IP-per-UTC-day rate limit. The non-idempotent, write-like nature is disclosed concretely rather than left to the hints.

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?

Front-loads what the key is and what it is for, then covers usage, exclusions, and limits. Every sentence carries distinct information (allowance lift, one-time return, billing, quota, rate cap) with no filler.

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 supplies the return semantics (a one-time secret to be passed as api_key), billing/quota behavior, and rate limits. Nothing an agent needs to call this correctly is missing.

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?

Zero parameters, so the baseline is 4. The description confirms 'No arguments,' which is adequate given the empty schema; no further parameter meaning is needed.

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?

States a specific verb (Mint) + resource (new PayCheck API key) and names the exact consumers (check_merchant, paycheck_get_quota). It also distinguishes its pc_live_ prefix from siblings' tw_ and sg_live_ keys, so an agent can tell it apart without opening schemas.

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 when-to-use (reach the 1,000/day merchant-check allowance), when-not (do not call every turn; not for Toolweather or SpendGate keys), and names the alternatives get_api_key and spendgate_get_api_key with their prefixes.

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