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og-mcp

Microsoft Fabric MCP Server

by og-mcp

fabric_onelake_create_directory

Create a new directory in a Microsoft Fabric OneLake workspace by specifying the path and optional workspace ID.

Instructions

Create a directory in OneLake.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
pathYesOneLake path relative to the workspace, e.g. "{itemId}/Files/data/file.csv"
workspaceNoWorkspace ID (defaults to FABRIC_DEFAULT_WORKSPACE)
Behavior1/5

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

With no annotations, the description fails to disclose any behavioral traits like required permissions, idempotency, or behavior if the directory already exists. The minimal description adds no value beyond the basic action.

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 extremely concise (6 words) and directly states the purpose. However, it is almost too brief, missing useful context without wasting words.

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?

For a simple creation tool with no output schema, the description lacks context on success indicators, error handling, or the effect of path parameters. It is incomplete for an agent to fully understand the tool's operation.

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% and already explains parameters (path with example, workspace as optional). The description adds nothing new, so baseline score of 3 is appropriate.

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 directory in OneLake' with a specific verb and resource. It distinguishes from sibling tools like fabric_onelake_delete_path or fabric_onelake_read_file which have different actions.

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?

No guidance provided on when to use this tool versus alternatives such as fabric_onelake_write_file (which might create directories implicitly). No prerequisites or exclusions mentioned.

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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