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fritz_reserve_ipv4

Reserve or release the IPv4 address of a device in a FRITZ!Box mesh, optionally pinning a specific IP by device UID.

Instructions

Reserve or release the IPv4 address of one device. Pass ip to pin a specific address.

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": {
      "uid": "<uid>"
    },
    "name": "fritz_reserve_ipv4"
  }
}

Input Schema

NameRequiredDescriptionDefault
ipNo
uidYes
reserveNo

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

C2.7/5.0
Behavior2/5

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

No annotations are provided, so the description carries the full behavioral burden for a mutation tool, yet it says nothing about permission requirements, whether the change is reversible, what happens to an existing reservation when released, or whether DHCP must be reconfigured. The reserve/release semantics are only vaguely implied.

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 with the action front-loaded and the ip hint trailing, with no filler. It is efficiently sized, though the terseness contributes to the missing semantics rather than compensating for them.

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 3-parameter mutation tool with no annotations, no output schema, and 0% schema coverage, the description should explain the reserve flag, uid scoping, and side effects. It covers only the ip parameter, leaving an agent unable to call it confidently in the common reserve=false case.

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

Parameters2/5

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

Schema description coverage is 0% across 3 parameters. The description explains only 'ip' ('pin a specific address'); 'uid' is only hinted at by 'one device', and the 'reserve' boolean (default true) — the core reserve-vs-release switch — is never mapped to a parameter or explained.

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 pair (reserve/release) and resource (the IPv4 address of one device), so an agent knows this mutates DHCP address reservations. It does not explicitly contrast with siblings, but the domain (device IPv4 reservation) is distinct enough from fritz_lan_dhcp and fritz_wake_on_lan to be recognizable.

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 statement of when to use this versus fritz_lan_dhcp or fritz_get_device, and no prerequisites are given (e.g., device must be known/connected). The only usage hint is 'Pass ip to pin a specific address', which covers one parameter but not the decision to reserve vs release.

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