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Onlydns

OnlyDNS MCP Server

Official
by Onlydns

create_tsig_key

Generate a TSIG key to authenticate secondary DNS transfers (AXFR) or dynamic DNS updates. Select HMAC or MD5 as the signing algorithm.

Instructions

Generate a new TSIG key for secondary DNS transfers (AXFR) or dynamic DNS updates.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
algorithmNoTSIG algorithm (default: hmac-sha256)hmac-sha256

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.0.0

TDQS

B3.2/5.0
Behavior2/5

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

With no annotations, the description carries the full behavioral burden and leaves key traits unstated: whether the generated secret is returned once and must be stored, whether the key is persisted to a keystore, whether it is idempotent, and what privileges are required. For a credential-generation tool these omissions matter.

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?

A single front-loaded sentence with the verb and resource first and no filler. It is appropriately sized, though it spends its one clause on use cases rather than the behavior an agent most needs.

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?

The tool is simple (one optional enum param, no output schema), so little is required, but with no output schema the description should say something about the returned key material and that it must be captured. That gap keeps it at minimum-viable completeness.

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% and the single algorithm parameter is fully documented with an enum and a default in the schema, so the baseline of 3 applies. The description adds no guidance on algorithm selection tradeoffs.

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 (generate) and resource (TSIG key) plus the intended purpose (secondary DNS transfers via AXFR, dynamic DNS updates). That distinguishes it from read-only siblings like list_tsig_keys and destructive ones like delete_tsig_key, though it never names an alternative explicitly.

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

Usage Guidelines3/5

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

The AXFR/dynamic-update phrasing implies when the key is needed, which is more than nothing, but there is no explicit when-to-use vs when-not guidance and no mention of the related siblings configure_domain_tsig or delete_tsig_key that follow creation.

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