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

Annotations already declare destructiveHint=true, idempotentHint=false, and openWorldHint=true, so the dangerous profile is covered there. The description adds one genuinely useful piece of context not in annotations — "Provider charges apply" — alerting the agent to cost. However it omits whether an existing service is required, whether the mount point must be empty, and whether approval is needed.

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 short, front-loaded sentences with no filler, and the core action leads. It is efficient, though arguably under-sized for a destructive 11-parameter operation.

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, non-idempotent mutation with 11 mostly-undocumented parameters and no output schema, the description is far too thin. It gives no lifecycle context (what a volume attaches to, resulting persistence, cleanup via railway_delete_volume) and leaves the agent guessing at most inputs.

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% across 11 parameters (4 required), and the description provides no parameter guidance whatsoever. The word "attach" faintly hints at mountPath, but projectId, environmentId, serviceId, and the beon_* parameters are entirely unexplained in both places.

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?

"Create and attach persistent storage" gives a clear verb (create), resource (persistent storage/volume), and an extra action (attach). It distinguishes itself reasonably from sibling volume tools like railway_create_volume_backup or railway_rename_volume, though it never names them or clarifies the create-vs-attach combination.

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?

There is no guidance on when to create a volume versus using an existing one, no mention of prerequisites (an existing project/environment/service), and no reference to alternatives such as railway_list_volumes or railway_update_volume_mount. Usage must be inferred entirely from the name.

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