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hcloud-mcp
by Xodus-CO

remove_firewall_from_resources

DestructiveIdempotent

Detach a Hetzner Cloud firewall from specified servers by providing the firewall ID and server IDs, so those servers stop using its rules.

Instructions

Remove a firewall from servers. Pass remove_from: [{ type: 'server', server: { id: 123 } }].

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": {
      "id": "<id>",
      "remove_from": "<remove_from>"
    },
    "name": "remove_firewall_from_resources"
  }
}

Input Schema

NameRequiredDescriptionDefault
idYesFirewall ID
remove_fromYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. Addedv0.1.1

TDQS

B3.1/5.0
Behavior2/5

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

Annotations already declare destructiveHint=true and idempotentHint=true, so safety is covered, but the description does not clarify the crucial behavioral point: that only the association is removed and the firewall object itself survives. For a destructive mutation that is a meaningful omission, and no error/partial-failure behavior is described.

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?

Two short sentences, front-loaded with the action and followed by the concrete payload. Every sentence earns its place; the only minor cost is that the example is presented without a word on why the nested shape matters.

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?

With annotations covering the safety profile and no output schema, the definition is adequate to make the call but under-explains the detach-vs-delete distinction and the multi-entry semantics of remove_from. For a destructive two-parameter mutation, a sentence on what is preserved would make it complete.

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?

Schema coverage is 50% and the undocumented parameter is remove_from; the description compensates by spelling out the exact array-of-object payload with a literal example, including the 'server' type constant. It does not explain whether multiple entries are allowed or that other resource types may someday be valid, but the key ambiguity is resolved.

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?

States a specific verb and resource ('Remove a firewall from servers') and the example makes clear this detaches from a server target. It lacks any explicit contrast with delete_firewall or apply_firewall_to_resources, which are the closest siblings, so the agent must infer the distinction from the names alone.

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?

There is no when-to-use guidance, no mention of when to prefer this over delete_firewall (removal vs. deletion), and no prerequisites such as the server needing the firewall currently assigned. Usage is only implied by the tool name.

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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