account_payment_methods_create

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

Annotations already declare destructiveHint=true, openWorldHint=true, idempotentHint=false and readOnlyHint=false, so the safety profile is fully covered structurally. The description adds nothing beyond the create verb — it doesn't say what gets destroyed or modified, whether a payment method already on file is replaced, side effects on subscriptions, or auth requirements — so it neither contradicts nor enriches the annotations. The residual 'POST /account/payment-methods' line merely restates the endpoint.

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?

Very short and front-loaded, with no padding. But half the content is a redundant HTTP route that adds nothing an MCP agent can act on, and the brevity comes at the cost of substance rather than from efficiency.

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?

For a destructive, open-world mutation with a nested body object, no output schema, and an undocumented parameter, the description should explain what is created, what identifies it, and what comes back or what errors are possible. It covers none of that, so the definition is thin relative to the tool's complexity.

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?

There is one nested required parameter, paymentMethodSlug, with 0% schema description coverage. The description does not explain what a slug refers to, where valid values come from, or whether a related list tool supplies them, leaving the only input entirely opaque.

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 and resource ("Create account payment method"), which is clearer than the bare tool name. However, it offers no differentiation from siblings such as account_payment_methods_get_by_id or billing_payment_methods_*, so the agent must infer that this is the creation variant from the name alone.

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?

No when-to-use guidance, no prerequisites, and no exclusions are given. The agent is left to infer from the verb that this is the write path and from sibling names which tool to pick for reads.

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