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mhajder

NetBox MCP Server

by mhajder

Netbox Render Config

netbox_render_config
Read-onlyIdempotent

Render a device or VM configuration from its assigned NetBox config template and context without making changes. Requires an API token with write enabled.

Instructions

Render the configuration of a device or VM from its assigned config template (NetBox config templates + config context). Changes nothing, but NetBox only allows it for API tokens with write enabled.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
object_idYesNumeric object ID.
object_typeYesDevice or virtual machine.
extra_contextNoExtra variables merged into the template context.
config_template_idNoRender this config template instead of the one assigned to the object.

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

A4.3/5.0
Behavior4/5

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

Annotations already cover the safety profile (readOnlyHint, idempotentHint, destructiveHint=false), so the bar is lower, and the description still adds a non-obvious behavioral fact the annotations cannot express: the write-token requirement despite a side-effect-free operation. It does not mention rate limits or output shape, but an output schema exists and covers the latter.

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?

Two short clauses, front-loaded with the action and followed immediately by the constraint. Every clause carries information; nothing is redundant with the title or annotations.

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

Completeness5/5

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

For a read-only render tool with full schema coverage, an output schema, and annotations declaring the safety profile, the description supplies the one missing piece an agent needs (the write-token prerequisite) without over-explaining return values that the output schema already defines.

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's mention of 'assigned config template' and 'config context' loosely corresponds to the config_template_id override and extra_context parameters, but it adds no syntax, format, or merge-precedence detail beyond what the schema already documents.

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 states a precise verb+resource: rendering a device/VM configuration from its assigned config template, with the parenthetical naming the two NetBox subsystems involved (config templates + config context). This is clearly distinguishable from the CRUD/query siblings (netbox_get_object, netbox_create_object, etc.), which all operate on objects rather than rendering derived config.

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?

It gives a genuine operational precondition that determines whether the call will succeed: NetBox requires an API token with write enabled even though nothing is modified. No alternative tool exists for this capability among the siblings, so the absence of explicit 'when-not' routing is acceptable. It stops short of stating when a caller would want to render config versus reading config context directly.

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