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

Even with annotations marking this as non-read-only and open-world, the description adds substantial behavioral detail: direct on-chain payment, no payout waiting/no commission, server never modified, no payment code needed, and the requirement for HTTPS and tools/list. It also discloses that the api_key is shown only once and is needed by all seller tools, going well beyond the annotations.

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 longer than the TDQS 4.3 example but every sentence carries meaningful information: purpose, usage, payment model, prerequisites, and return values. It is front-loaded with the primary purpose and remains structured, though a list/bullet format could improve scannability.

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 responsibility for explaining return values, and does so clearly ('Returns a proxy URL and a secret api_key shown only once'). It also covers prerequisites (public HTTPS, tools/list), payment mechanics, and the non-modification guarantee, making it complete for a registration tool.

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 input schema provides 100% parameter descriptions, so the baseline is 3. The description does not add per-parameter semantics beyond the schema, though it does explain the return value's api_key, which is indirectly tied to the seller tools requirement.

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 opens with 'Start charging for an MCP server the user owns,' which clearly specifies the action and resource. It is distinguished from sibling tools like get_earnings or set_tool_price by establishing this as the registration/monetization entry point.

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 explicitly states when to use the tool: 'Use when they want to monetize, sell, charge for, get paid for, put a price on, or make money from a server, API or tool.' This provides clear context, though it does not name alternatives or explicit exclusions.

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