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create_volume

Create a persistent volume and attach it to a Railway service by specifying project, environment, service, and mount path.

Instructions

Create a persistent volume attached to a service

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
mountPathYesMount path inside the container (e.g. '/data')
projectIdYesThe project ID
serviceIdYesThe service ID to attach the volume to
environmentIdYesThe environment ID
Behavior2/5

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

No annotations are provided, so the description carries the full burden. It only states the creation action and the 'persistent' trait, but fails to disclose prerequisites, reversibility, permission requirements, or side effects (e.g., what happens to the volume if the service is deleted). This is a significant gap for a mutation tool.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single, front-loaded sentence with no wasted words. It efficiently conveys the tool's purpose without verbosity or redundancy.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

The description adequately states the tool's purpose for a simple create operation with 4 required parameters and no output schema. However, without annotations, it lacks behavioral context and usage guidance, leaving the agent with only basic intent and no deeper operational details.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so the baseline is 3. The description adds no additional parameter-level meaning beyond the schema, which already documents each parameter clearly. It does not compensate for any gaps because there are none.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description uses a specific verb (create) and resource (persistent volume) with an explicit attachment relationship to a service. It clearly distinguishes itself from any sibling tool, as no other volume-related tool exists in the provided list.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description conveys a clear context: this tool is for creating persistent volumes for a specific service. It doesn't explicitly mention alternatives or when-not-to-use, but the context is unambiguous and no direct alternative volume tool exists among siblings.

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

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