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TrueNAS Core MCP Server

TrueNAS Core MCP Server

by vespo92
OverviewSchemaSourceRelated ServersDiscussionsAdmin
Python
Remote

modify_dataset_permissions

Change dataset permissions on TrueNAS Core, including mode, owner, and group settings. Supports recursive application for directories.

Instructions

Modify dataset permissions (chmod/chown equivalent)

Args:
    dataset: Dataset path (e.g., "tank/data")
    mode: Unix permission mode (e.g., "755", "644")
    owner: Owner username or UID
    group: Group name or GID
    recursive: Apply permissions recursively

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "dataset": "<dataset>"
    },
    "name": "modify_dataset_permissions"
  }
}

Input Schema

NameRequiredDescriptionDefault
datasetYes
groupNo
modeNo
ownerNo
recursiveNo

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.0.0

TDQS

B3.3/5.0
Behavior2/5

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

With no annotations provided, the description carries the full burden of behavioral disclosure. While it implies a mutation operation ('modify'), it doesn't specify critical behavioral traits such as required permissions, whether changes are reversible, potential side effects, or error conditions. The chmod/chown analogy provides some context but lacks operational details.

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 well-structured and appropriately sized. The purpose statement is front-loaded, followed by a clear parameter breakdown. Every sentence adds value, though the chmod/chown analogy could be slightly more explicit about its limitations in this context.

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?

Given the mutation nature of the tool, no annotations, and no output schema, the description is moderately complete. It excels at parameter documentation but lacks behavioral context about permissions requirements, side effects, and return values. For a permission-modification tool with 5 parameters, more operational guidance would be beneficial.

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

Parameters5/5

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

The description provides excellent parameter semantics beyond the schema. With 0% schema description coverage, the description fully compensates by explaining all 5 parameters: dataset path format, mode format and examples, owner/group identifiers, and recursive behavior. Each parameter's purpose and format is clearly documented.

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

Purpose4/5

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

The description clearly states the tool's purpose: 'Modify dataset permissions (chmod/chown equivalent)'. It specifies the verb ('modify') and resource ('dataset permissions'), making the function unambiguous. However, it doesn't explicitly differentiate from sibling tools like 'modify_dataset_properties' or 'update_dataset_acl', which also modify dataset attributes.

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 no guidance on when to use this tool versus alternatives. It doesn't mention sibling tools like 'modify_dataset_properties' or 'update_dataset_acl', nor does it specify prerequisites, exclusions, or appropriate contexts for permission modification versus other dataset operations.

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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