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

The destructiveHint=true and readOnlyHint=false annotations already tell the agent this is an irreversible write, so the bar is lower. The description's one contribution is the word 'permanently', which confirms non-recoverability but adds little beyond the annotation; it says nothing about the approval_id parameter's implied approval workflow, locked-backup behavior, or required permissions.

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?

A single front-loaded sentence with no filler; the verb and the irreversible nature are stated first. It is efficient, though so terse that it borders on under-specification rather than crisp conciseness.

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 tool with 9 parameters, an unexplained approval_id, and no output schema, the description is far too thin. An agent cannot determine prerequisites (approval flow, locked backups), what identifiers are needed, or what happens on success from this text.

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 9 parameters, so the description must compensate and does not. It never explains the difference between volumeInstanceId and volumeInstanceBackupId, nor the seven beon_* parameters (context, resume/release ids, environment enum, fixed connection id), leaving an agent guessing at what is required to invoke the tool.

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 ('delete a volume backup'), which is unambiguous on its own. However, it does nothing to distinguish this from the several adjacent siblings such as railway_delete_volume, railway_lock_volume_backup, and railway_restore_volume_backup, all of which operate on the same volume-backup domain.

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 when-to-use guidance, no named alternative (e.g. restore vs delete, or how to find a backup id via railway_list_volume_backups), and no preconditions such as whether a locked backup can be deleted. The agent is left to infer everything about context.

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