fleetwatch

fleetwatch is a small local bridge to ET Ducky's hosted MCP server, which watches over an organisation's fleet of endpoint agents — the Windows and Linux machines running the ET Ducky agent — and reports who is online, how each machine's health looks, and which alerts are open.

The bridge keeps no fleet data and runs no checks of its own. It serves the upstream server's tool list locally, exactly as captured from the live endpoint, and forwards each tool call upstream, returning the result untouched. The whole captured surface is read-only: this rebuild adds no write capability.

Tools

• list_agents — enumerate the organisation's agents with OS, agent version, online state, last heartbeat, last signed-in user, isolation state and tags, sorted by hostname. All arguments are filters: search (a case-insensitive part of the hostname), os (windows, linux or other), online (true for agents with a heartbeat in the last 5 minutes), tag (one exact tag name), and limit (1-500, default 100).

• get_agent — one agent in full: its latest health sample (CPU, memory, free space on C:, uptime, pending reboot, make and model) and its count of active alerts. Required: agent_id, the id from list_agents.

• list_alerts — alerts raised for the organisation's agents, newest first. Optional: status (active, acknowledged, resolved, auto_resolved, suppressed or any; defaults to active), severity (for example critical or warning), agent_id to scope to one machine, since_hours (1-720, default 168 — seven days) and limit (1-500, default 100).

• get_fleet_summary — the organisation at a glance: agent counts, online and offline, the Windows / Linux / other OS split, isolated agents, and active alerts by severity. No arguments.

Related MCP server: LimaCharlie MCP

Configuration

• ETDUCKY_MCP_URL (optional) — override the upstream endpoint. Defaults to https://etducky.com/api/mcp. (The override hook is this rebuild's own labelled reconstruction.)

• ETDUCKY_API_KEY (optional) — when set, every upstream request carries an Authorization: Bearer <key> header. When it is not set, no auth header is sent. (This forwarding is also a labelled reconstruction; the original surface was captured keyless.)

Forwarding mechanics

On the first tool call the client opens a streamable HTTP session with the upstream: a JSON-RPC initialize request (protocolVersion 2025-03-26, clientInfo name fleetwatch), then a notifications/initialized notification, then the tools/call request carrying the caller's arguments unchanged. When the upstream answers initialize with an Mcp-Session-Id header, that value rides on every later request of the session, which is reused for the life of the process. Replies may arrive as plain JSON or as server-sent events; both are read.

Successful upstream results pass through verbatim, including any isError flag the upstream sets. Failures — a JSON-RPC error, a non-2xx status, an unreadable response, or a request that cannot be completed — come back as an isError result whose text starts with fleetwatch error: (this rendering is this rebuild's own labelled reconstruction).

CLI

Each tool is also a subcommand taking one JSON argument string (omit it for tools that take none):

npx @reneturcios/fleetwatch list_agents '{"os":"windows","online":true}'
npx @reneturcios/fleetwatch get_agent '{"agent_id":"agent-42"}'
npx @reneturcios/fleetwatch get_fleet_summary
npx @reneturcios/fleetwatch --version

Exit codes: 0 on success, 1 on an isError result, 2 on a usage error.

MCP server

npx -y @reneturcios/fleetwatch mcp

MCP client config:

{
  "mcpServers": {
    "fleetwatch": {
      "command": "npx",
      "args": ["-y", "@reneturcios/fleetwatch", "mcp"]
    }
  }
}

Docker

docker run -i ghcr.io/cloudcorprecords/fleetwatch
docker run --rm ghcr.io/cloudcorprecords/fleetwatch --version

The container's default command is mcp, so the first form is a stdio MCP server; any other arguments reach the CLI normally.

Development

npm install
npm run build
npm test
npm run dev

The test suite runs entirely against a stubbed JSON-RPC upstream — no live network calls.

License

MIT — see LICENSE.