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ddns_forceupdate

Force an immediate Dynamic DNS update on a DrayTek Vigor 3912S router by providing a user code and confirmation token to authorize the write.

Instructions

Force DDNS update (write — requires confirmation)

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
user_codeNo
confirm_tokenNo
confirmation_idNo

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.6.0

TDQS

C2.7/5.0
Behavior3/5

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

With no annotations, the description must itself disclose behavior; it does clearly say this is a write action and that confirmation is required. However, it does not explain the confirmation flow, what side effects a forced update has, or what happens if the confirmation is invalid.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness3/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The one-line description is front-loaded and free of filler, which is good, but it is also under-specified for a write tool with three undocumented parameters. Brevity here crosses from concise into incomplete.

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 mutation tool with no annotations, no output schema, 0% parameter coverage, and zero required parameters, the description does not explain how to invoke the operation correctly or interpret the result. It is minimally usable at best.

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

Parameters1/5

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

The schema provides no descriptions for user_code, confirm_token, or confirmation_id (0% coverage), and the tool description does not explain or map these parameters. 'Requires confirmation' only hints at the token/id fields without giving the agent enough to populate them correctly.

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 states a specific action and resource ('Force DDNS update') and flags it as a write operation, which separates it from the surrounding read/query tools like ddns_show and ddns_log. It mostly restates the tool name and doesn't explicitly contrast it with ddns_enable, so it stops short of a 5.

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 guidance on when to force an update versus using ddns_show, ddns_log, or ddns_enable, and no mention of prerequisites such as obtaining or supplying a confirmation. The 'requires confirmation' note is a precondition, not a usage rule.

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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