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

With no annotations, the description carries the full burden; it does disclose that the call is metered and that it returns a signed receipt, which is useful beyond the schema. It does not state permissions/auth requirements, whether the exit is destructive or irreversible, or what 'proven order' entails.

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 action front-loaded and the payment-rail caveat parenthetically contained. Slightly dense 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?

For a 2-param tool with no annotations and no output schema, it covers the return value (signed receipt) and billing behavior, which is helpful. It still leaves the 'mode' parameter, auth expectations, and the meaning of the 'proven order' unexplained, so an agent cannot call it fully informed.

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?

Schema description coverage is 0% for both parameters, so the description must compensate and largely does not. 'mode' is never mentioned and 'service_id' is only implied by the notion of an exit; 'proven order' might relate to mode but is never explained.

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+resource ('Execute an exit') and adds that it returns a signed receipt, which separates it from exit_probe/exit_sweep/exit_verify_receipt implicitly. However, it never defines what an 'exit' is in this domain and gives no explicit sibling differentiation, and 'in the proven order' is opaque jargon.

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?

Provides a real routing condition: metered like the HTTP exit, with only trial/plan rails available via MCP and paid rails directed to the HTTP endpoint with x402. That is a clear when-not constraint, but it gives no guidance on when to call this versus the sibling exit_* tools.

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