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create_modal_volume

Provision a named, persistent Modal volume for sharing data across functions and environments.

Instructions

Create a named, persistent Modal volume (`modal volume create`).

Args:
    volume_name: Name for the new volume.
    env: Optional Modal environment to create the volume in.

Returns:
    A dictionary containing the result of the create operation.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
volume_nameYes
envNo

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior2/5

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

No annotations are provided, so the description carries full burden. It only states the volume is 'persistent' and returns a dictionary. It does not disclose side effects, idempotency, error conditions, or permissions needed for a creation operation.

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

Conciseness4/5

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

The description is very concise with a clear front-loaded purpose statement and brief arg explanations. The returns section is vague but acceptable given the output schema exists. Every sentence adds value without redundancy.

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

Completeness2/5

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

Despite having an output schema, the description lacks completeness for a creation tool. It does not address existence checks, idempotency, or error scenarios. With no annotations and 0% schema coverage, the description should provide more behavioral and context details.

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

Parameters4/5

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

The schema has 0% description coverage, so the description compensates well by explaining both parameters: 'Name for the new volume' and 'Optional Modal environment'. This adds meaningful context beyond the schema's type definitions.

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 clearly states 'Create a named, persistent Modal volume' with a specific verb and resource. It distinguishes from sibling tools like delete_modal_volume or create_modal_secret by focusing on volume creation.

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

Usage Guidelines2/5

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

The description provides basic parameter explanations but no guidance on when to use this tool vs alternatives, no prerequisites, and no conditions for use. It does not help the agent decide between this and other create tools.

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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