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by io.github.tashfeenahmed
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add_acme_challenge

Publish a Let's Encrypt DNS-01 challenge: creates a TXT record at _acme-challenge.. with the token your ACME client printed. Use this to get a certificate without exposing port 80 (for example for a wildcard cert, or a host behind NAT). DNS propagates within seconds, then tell your ACME client to continue. For a normal public web server, HTTP-01 validation needs no DNS record at all.

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": {
      "label": "<label>",
      "value": "<value>"
    },
    "name": "add_acme_challenge"
  }
}

Input Schema

NameRequiredDescriptionDefault
labelYesThe subdomain label, without the domain suffix (e.g. 'myapp' for myapp.makes.fyi).
valueYesThe challenge token from your ACME client, published verbatim as the TXT value.
domainNoWhich domain to act under: 'makes.fyi' (the default) or 'agentdomains.co'. The same label can exist under each, so pass this whenever you are not using the default.

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observed

TDQS

A4.4/5.0
Behavior4/5

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

No annotations are provided, so the description carries the behavioral burden. It explicitly discloses the DNS mutation, the exact record name, that propagation is fast, and that the ACME client should continue afterward. It does not mention cleanup of the challenge record or behavior when a TXT record already exists, which is a modest gap for a mutating DNS operation.

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 four sentences, front-loaded with the core operation and target, followed by use cases, propagation timing, and a useful guardrail. Every sentence earns its place and nothing is redundant.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a DNS mutation tool without annotations or an output schema, the description covers why, when, what happens, and what to do next. The main omission is what to do with the challenge record after validation, and there is no mention of what the tool returns or whether it can overwrite an existing record.

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%, so the schema already documents all parameters. The description adds useful meaning by linking label, domain, and value to the generated _acme-challenge hostname and says the value must be published verbatim, but it does not need to compensate for missing schema entries.

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

Purpose5/5

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

The description states a specific verb and resource: it creates a Let's Encrypt DNS-01 TXT record at _acme-challenge.<label>.<domain>. It clearly distinguishes this from generic DNS record operations and from HTTP-01 validation.

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

Usage Guidelines5/5

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

It gives explicit when-to-use guidance: get a certificate without exposing port 80, such as a wildcard cert or a NAT-hosted domain. It also gives a when-not-to-use signal: normal public web servers should use HTTP-01 validation and need no DNS record at all.

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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