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

Annotations already declare destructiveHint=true, openWorldHint=true, and idempotentHint=false, so the safety profile is covered. The description adds nothing about permanence, permission requirements, whether an existing domain is replaced, or the approval_id workflow — meaningful gaps for a destructive create in an open-world environment. It does not contradict 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?

One short, front-loaded sentence with no waste, but its brevity reflects under-specification rather than efficient information density.

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?

A 10-parameter destructive create tool with no output schema and no parameter documentation cannot be called correctly from this description alone. It should at minimum explain serviceId/environmentId/targetPort and the approval flow.

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?

Ten parameters with 0% schema description coverage, and the description mentions none of them. Critical inputs like targetPort, approval_id, and the beon_* metadata fields are completely unexplained in both schema and description, leaving the agent unable to supply them correctly.

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 a Railway-generated public service domain). The word 'generated' implicitly distinguishes it from railway_create_custom_domain, though it never names that sibling explicitly.

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 mention of the obvious alternative railway_create_custom_domain or railway_delete_service_domain. The agent must infer the generated-vs-custom distinction from a single adjective.

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