ccu-mcp

Paste it into your assistant. It asks for the manifest, the server wiring and the skills, and for an honest account of what this record does not say. Read that second file first.

Draft an Agent Plugin (agent-plugins.org, specification 1.1.0) that wraps the
MCP server described below, so that somebody could install one thing and have
an assistant that knows when and how to use it.

An Agent Plugin is one installable unit: a `plugin.json` manifest, an
`mcp.json` that wires up the servers it needs, and a `skills/` directory
where each skill is a folder holding a `SKILL.md`. Hand back every file in
full, each under its own path, ready to save.

1. Write `plugin.json` with `$schema` exactly `https://agent-plugins.org/schemas/1.1.0/plugin.schema.json`. The name is
   1 to 64 characters of a-z, 0-9, `-` and `.`, alphanumeric at both ends, with
   no `--` and no `..` in it.

2. Write `mcp.json` wiring THIS server exactly as its record declares it. A
   remote keeps the URL and the transport type as written. A package keeps the
   registry, the identifier and the version as written. Do not invent a command,
   a port, a flag or an argument that is not in the record.

3. Every secret stays an input. No key, token, password or connection string
   belongs in either file. Declare what has to be supplied, name it, and say what
   it is for.

4. Do not invent tools. The record lists the tools it lists, and if it lists
   none then the honest plugin says the tool list was not published rather than
   guessing one from the description.

5. Skills are jobs, not tools. Write one skill per thing somebody would actually
   ask for, and inside each one say when to reach for this server, what a good
   result looks like, and what to do when it comes back empty. A skill per tool
   is a manual page with a different filename.

6. Say where it stops. Name what this plugin will not do — what it has no tool
   for, what needs a person, and what it must not be pointed at. A plugin with no
   stated edge reads as one with no edge.

7. Keep the author's own words for the description. If you would rather say it
   differently, say yours somewhere else and leave theirs where it is.

8. Record which version of the server you wrapped, and where the record came
   from, at the top of `plugin.json`'s description or in the readme. A plugin
   nobody can trace back to a version is one nobody can update.

Produce a second file alongside them, `LIMITS.md`, and treat it as the more
important of the two. The plugin is for whoever installs it. This is for
whoever has to decide whether installing it is a good idea, and that is
usually a different person who will never read the manifest.

It has three parts.

**What this is built from.** One paragraph: whose server it is, what the
record says it does, which version, and the fact that the record is all you
had. Say plainly that nobody ran it.

**What the record does not say.** One entry per gap. Whether the tool list was
published. What the server does with what it reads. What it costs. Whether it
writes anything anywhere. What credentials it will ask for and what those
credentials can reach. An unanswered question stays an unanswered question:
do not fill one in from the description or from what similar servers usually do.

**What a person has to check before trusting it.** The specific things
somebody should verify for themselves, in the order that would stop them
soonest if the answer is bad.

Write it in plain English, and do not soften it. A plugin drafted from a
directory record is a starting point to argue with, not something to install
into anything that matters.

The server record follows, exactly as the public index holds it. It is
everything I have: nobody has run this server, called a tool on it, or checked
that the address answers.

```json
{
  "server": {
    "$schema": "https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json",
    "name": "io.github.claymore666/ccu-mcp",
    "description": "MCP server for controlling HomeMatic smart home devices via the CCU JSON-RPC API",
    "repository": {
      "url": "https://github.com/claymore666/ccu-mcp",
      "source": "github"
    },
    "version": "1.10.0",
    "packages": [
      {
        "registryType": "npm",
        "identifier": "ccu-mcp",
        "version": "1.10.0",
        "runtimeHint": "npx",
        "transport": {
          "type": "stdio"
        },
        "packageArguments": [
          {
            "value": "--stdio",
            "type": "positional"
          }
        ],
        "environmentVariables": [
          {
            "description": "Hostname or IP of your HomeMatic CCU (debmatic, CCU3, or OpenCCU/RaspberryMatic)",
            "isRequired": true,
            "format": "string",
            "name": "CCU_HOST"
          },
          {
            "description": "CCU admin password (same as the WebUI login)",
            "isRequired": true,
            "format": "string",
            "isSecret": true,
            "name": "CCU_PASSWORD"
          },
          {
            "description": "CCU username",
            "format": "string",
            "default": "Admin",
            "name": "CCU_USER"
          },
          {
            "description": "Connect to the CCU via HTTPS (self-signed certificates supported)",
            "format": "boolean",
            "default": "false",
            "name": "CCU_HTTPS"
          },
          {
            "description": "CCU API port (80 for HTTP, 443 for HTTPS)",
            "format": "number",
            "default": "80",
            "name": "CCU_PORT"
          },
          {
            "description": "Directory for the device type cache and session persistence",
            "format": "string",
            "default": "/data",
            "name": "CACHE_DIR"
          },
          {
            "description": "Comma-separated allowlist of browser origins. Unset = no cross-origin browser access (default-deny). An allowlisted origin is reflected exactly in Access-Control-Allow-Origin (never '*'); the list also drives DNS-rebinding origin checks",
            "format": "string",
            "name": "MCP_ALLOWED_ORIGINS"
          },
          {
            "description": "Extra Host header values accepted by DNS-rebinding protection (comma-separated host:port); add your hostname when behind a proxy or container DNS name",
            "format": "string",
            "name": "MCP_ALLOWED_HOSTS"
          },
          {
            "description": "Comma-separated names of multiple CCU targets (e.g. 'prod,dev'). Each profile takes the flat CCU_* settings prefixed CCU_<NAME>_ (CCU_PROD_HOST, ...), plus policy flags CCU_<NAME>_PROTECTED (writes need confirm:true) and CCU_<NAME>_READONLY. Unset = single default profile from the flat CCU_* vars",
            "format": "string",
            "name": "CCU_PROFILES"
          },
          {
            "description": "Which profile from CCU_PROFILES is active at startup (default: the first listed)",
            "format": "string",
            "name": "CCU_DEFAULT_PROFILE"
          },
          {
            "description": "Verify the CCU's TLS certificate against the system trust store. Only meaningful with CCU_HTTPS=true. Default false, because a CCU ships a self-signed certificate — prefer CCU_TLS_FINGERPRINT or CCU_CA_CERT to verify one of those",
            "format": "boolean",
            "default": "false",
            "name": "CCU_TLS_VERIFY"
          },
          {
            "description": "Pin the CCU's self-signed leaf certificate by its SHA-256 fingerprint (hex, colons optional). The strongest option for an appliance: the connection is rejected unless the presented certificate matches. Takes precedence over CCU_CA_CERT",
            "format": "string",
            "name": "CCU_TLS_FINGERPRINT"
          },
          {
            "description": "Path to a PEM file holding the CCU's CA or self-signed certificate. The connection is then validated against it with standard chain verification",
            "format": "string",
            "name": "CCU_CA_CERT"
          },
          {
            "description": "Timeout for a CCU JSON-RPC call, in MILLISECONDS",
            "format": "number",
            "default": "10000",
            "name": "CCU_TIMEOUT"
          },
          {
            "description": "Timeout for HomeMatic Script execution (ReGa), in MILLISECONDS — scripts are slower than plain API calls",
            "format": "number",
            "default": "30000",
            "name": "CCU_SCRIPT_TIMEOUT"
          },
          {
            "description": "Lifetime of the on-disk device-type schema cache, in SECONDS",
            "format": "number",
            "default": "86400",
            "name": "CACHE_TTL"
          },
          {
            "description": "Token-bucket burst size for CCU requests — how many may be issued back to back",
            "format": "number",
            "default": "20",
            "name": "CCU_RATE_LIMIT_BURST"
          },
          {
            "description": "Sustained CCU request rate, in requests per second",
            "format": "number",
            "default": "10",
            "name": "CCU_RATE_LIMIT_RATE"
          },
          {
            "description": "How often MCP resources are polled for change notifications, in SECONDS",
            "format": "number",
            "default": "60",
            "name": "RESOURCE_POLL_INTERVAL"
          },
          {
            "description": "error | warn | info | debug. Logs are structured JSON on stderr",
            "format": "string",
            "default": "info",
            "name": "LOG_LEVEL"
          }
        ]
      }
    ]
  },
  "_meta": {
    "io.modelcontextprotocol.registry/official": {
      "status": "active",
      "statusChangedAt": "2026-08-19T18:32:57.984269Z",
      "publishedAt": "2026-08-19T18:32:57.984269Z",
      "updatedAt": "2026-08-19T18:32:57.984269Z",
      "isLatest": true
    }
  }
}
```

The server is listed as "ccu-mcp".