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

With no annotations, the description carries the full burden and does disclose meaningful semantics: results are deployment-scoped, gate live money, and are bypassed entirely in test mode. It does not cover permissions, caching/rate limits, or whether flags can change mid-session, so it stops short of full behavioral disclosure.

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?

Two tight sentences with the core scope front-loaded and the test-mode caveat as a clearly subordinate second sentence. Slightly awkward phrasing ('has switched on', no leading verb) costs it a point but nothing is wasted.

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 and no annotations, so the description is the only contract, and it never states the return shape (names only? name/boolean map? per-environment breakdown). For a simple no-argument read it is close to adequate, but the response format gap leaves the agent guessing how to interpret the result.

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; there is no argument to misdocument and the description introduces no parameter claims to contradict.

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 the resource precisely: the set of flagged capabilities enabled on this deployment for live money, and enumerates the flags (refunds, recurring, bnpl, card_tokens, paypal_billing, disputes). It is a discovery/entitlement read, clearly distinct from action siblings like wavepay_refund or wavepay_subscribe, though the phrasing is a noun clause rather than a verb and never literally says 'returns' or 'lists'.

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 sentence 'Test-mode keys can use every one' gives a real selection rule: in test mode there is nothing to check. But it never says when an agent should call this before attempting a sibling operation, and no alternative or prerequisite is named explicitly.

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