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Proxmox MCP Server

by Ruashots

pve_set_vm_firewall_options

Configure firewall settings for Proxmox virtual machines, including policies, filtering, logging, and network protocol permissions.

Instructions

Set VM firewall options

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
nodeYesNode name
vmidYesVM ID
enableNoEnable firewall
dhcpNoAllow DHCP
macfilterNoEnable MAC filter
policy_inNoInput policy
policy_outNoOutput policy
log_level_inNoInput log level
log_level_outNoOutput log level
ipfilterNoEnable IP filter
ndpNoAllow NDP
radvNoAllow router advertisement
Behavior2/5

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

With no annotations provided, the description carries full burden for behavioral disclosure. 'Set' implies a mutation/write operation, but the description doesn't disclose important behavioral traits: whether this requires administrative privileges, if changes are immediate or require restart, what happens to unspecified options (partial vs complete updates), or potential side effects. For a 12-parameter mutation tool with zero annotation coverage, this represents a significant transparency gap.

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 maximally concise at just three words with zero wasted text. It's front-loaded with the core action and resource. While severely under-specified for a complex tool, this isn't a conciseness issue but rather a completeness problem scored elsewhere. As pure text efficiency, it earns full marks.

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 12-parameter mutation tool with no annotations and no output schema, the description is completely inadequate. It doesn't explain what 'firewall options' encompass, doesn't provide context about the VM environment, doesn't mention relationships to other firewall tools, and offers no guidance on proper usage. The 100% schema coverage helps with parameters, but the description fails to provide the necessary operational context for safe and effective use.

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%, with all 12 parameters clearly documented in the input schema including enums for policy_in, policy_out, log_level_in, and log_level_out. The description adds no parameter information beyond what the schema already provides ('Set VM firewall options' doesn't elaborate on any parameters). With comprehensive schema coverage, the baseline score of 3 is appropriate as the schema does the heavy lifting.

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

Purpose2/5

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

The description 'Set VM firewall options' is a tautology that restates the tool name with minimal elaboration. It specifies the verb ('Set') and resource ('VM firewall options'), but lacks specificity about what options are involved or how it differs from sibling tools like pve_set_container_firewall_options or pve_set_cluster_firewall_options. This provides only basic identification without meaningful differentiation.

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

Usage Guidelines1/5

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

The description provides absolutely no guidance on when to use this tool versus alternatives. It doesn't mention prerequisites, appropriate contexts, or relationships to sibling tools like pve_get_vm_firewall_options (for reading settings) or pve_create_vm_firewall_rule (for rule management). Without any usage context, an agent would struggle to determine when this tool is appropriate.

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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