Skills

Tells an agent what changed on a server since it last looked - plus status, Docker, backups, Proxmox. 44 MCP tools, each classed read, write or destructive.

Homebutler

homebutler remembers what a server looked like last time and reports only the changes worth mentioning. One Go binary: no database, and no agent on the machines it watches — the binary is deployed there once and runs only when asked, over SSH.

This file is published to ClawHub as @higangssh/homebutler. The copy that matters lives in the repository at skills/SKILL.md, and a test in cmd/ fails the build when a command or a tool named here stops existing.

Use the MCP server, not the shell

Start homebutler mcp and call tools. Every tool is classed read, write or destructive, and that classification is what lets an agent decide what it may do unattended. Shell commands are for the handful of things no tool exposes, and for anything the operator has to run themselves.

bash

homebutler mcp

The tools

Read (27) — nothing changes; see what a read still exposes, below.

• system_status, processes, open_ports, alerts, alerts_history
• doctor — health, exposure, backup age and readiness, as findings
• inventory_scan, inventory_export, network_scan, config_validate
• docker_list, docker_logs, docker_stats, docker_top, docker_inspect
• backup_list, install_list, install_status
• watch_list, watch_history
• proxmox_status, proxmox_guests, proxmox_node, proxmox_tasks, proxmox_task_status, proxmox_script_list, proxmox_script_command

Write (13) — something changes, or something leaves the machine.

• report — the comparison, and it saves a snapshot
• docker_restart, wake, notify_test
• backup_create, backup_drill
• install_app, install_uninstall
• watch_add, watch_check, watch_remove
• proxmox_guest_start, proxmox_guest_reboot

Destructive (4) — ask first.

• backup_restore — overwrites volumes with an archive
• docker_stop, install_purge — stops a service, deletes its data
• proxmox_guest_shutdown

What the classes mean for you

• read — changes nothing on the machine, so running one needs no confirmation. What comes back is another matter: hostnames, internal addresses, what is listening, what is running, log contents. So read the machine the operator is asking about rather than every machine in the config; --all and inventory_scan are answers to a question somebody asked, not a way to begin. Summarise what matters instead of returning raw logs, port tables or JSON into a conversation other people can read.
• write — something changes on the machine, or a message leaves it. Do it when it follows from what was asked, and say afterwards what changed.
• destructive — never on your own initiative. Only when the operator asked for that specific action on that specific target, in the turn you are answering. Do not infer one from a goal: "free up space" is not permission to run install_purge, and "make it match production" is not permission to run backup_restore.

backup_restore and the Proxmox power tools take an explicit confirmation argument, so a call without it fails rather than proceeding. That is a backstop, not the rule — the rule is that the operator asked.

When an action is refused for lack of confirmation, say what would be destroyed and let the operator decide. Do not re-send the same call with the confirmation set.

Two things about reads that are easy to miss:

• A remote read is not free. It is an SSH round trip to somebody's server, every time. Polling in a loop is a cost they pay.
• "What changed?" does not need a sweep. report already answers it by comparing against the last snapshot, which is why it is the first thing to reach for rather than a tour of every tool.

Start here: what changed?

report is the answer to "how is my server doing?" — it compares the machine against the last snapshot rather than describing the present.

Each change carries a kind, and --json carries the same word, so branch on it rather than reading the sentence:

Kind	Means
gone	it was there last time and is not now
new	it was not there last time and is now
replaced	same name, different thing underneath — a recreated container
image	same container, different image
state	running where it was stopped, or the reverse
port	same port, a different process answering on it
disk	a mount moved by more than half a gigabyte
skipped	the comparison could not be made — not an all-clear

json

{"kind": "replaced", "target": "vaultwarden",
 "detail": "recreated, 4f2a1c → 9b7e03, vaultwarden:1.32 → vaultwarden:1.33",
 "text": "replaced: vaultwarden — recreated, …"}

needs_attention and suggested_actions have the same shape. An action may carry a command, and when it does it also carries runner and tool:

• runner: mcp — call tool and carry it out
• runner: cli — homebutler can do it, no tool exposes it; the operator runs it
• runner: shell — not a homebutler command at all

An action with nothing to run — "address the items above" — has no command, and then no runner either. All three are omitted rather than sent empty, so absence means there is nothing to offer rather than something unclassified.

doctor findings carry the same three fields. Check runner before offering to fix something.

What needs a shell

bash

homebutler init
homebutler trust <server>
homebutler watch install
homebutler watch tui
homebutler serve --token <token>
homebutler serve install
homebutler deploy --server <name>
homebutler upgrade

No tool exposes any of these, and a test checks that against the registry rather than trusting this list.

restore has a tool, and you should still run it yourself

restore writes over the data an app is running on, and the path it writes to comes from the archive rather than from you — which is why the CLI refuses a bind mount unless you name the path with --allow-bind. There is a backup_restore tool, and over MCP it never restores bind mounts, for the same reason: an agent has no way to name a host path it is allowed to write to, so the archive's bind mounts are refused and reported in the result.

bash

homebutler restore <archive>

trust, and when it is required

bash

homebutler trust <server>
homebutler trust <server> --reset

Since 0.34.0, a server that signs in with a password must be trusted before the first connection: homebutler will not send a password to a host it has not been told to trust, because whatever answers at that address would receive it. Key authentication still trusts on first use — the private key never leaves the machine.

watch supervises, watch tui displays

bash

homebutler watch add <container>
homebutler watch install
homebutler watch tui

watch is a restart tracker: it records incidents, captures the logs from the moment a container went down, and notifies. watch install hands that loop to the machine's own supervisor — a systemd user unit or a launchd agent — so it keeps running after logout. That is the one part of homebutler that stays running, and it runs where the operator installed it, not on the machines it watches. It is not a live dashboard — that is watch tui, and it is for a person rather than an agent.

serve edits, with a token

bash

homebutler serve
homebutler serve --token <token>
homebutler serve --host 0.0.0.0 --token <token>
homebutler serve install

Since 0.33.0 the dashboard edits the config file: alert thresholds, notification channels, Wake-on-LAN devices, servers and Proxmox endpoints. Without a token it is read-only and the write routes do not exist at all. The token can also live in the config file as web.token, which is where serve install reads it: a unit file is not homebutler's to protect, and --token is visible in ps to every user on the machine. The Report tab shows what report reports. There is a container image, ghcr.io/higangssh/homebutler, which reaches the machines in servers: over SSH — a container cannot see the host it runs on, and says so rather than answering with its own numbers.

Notifications

Channels: telegram, slack, discord, webhook, ntfy, gotify. ntfy and Gotify are the two self-hosted push servers, and each takes its own shape rather than a webhook payload. Tokens travel in a header, never in a URL, so a failed request cannot put one in a log.

bash

homebutler notify test

notify_test reports each channel separately, so a failure names the channel that failed rather than all of them.

Proxmox

Configured under proxmox: with an API token. The read credential and the one that performs guest actions are separate: without an action token, start, reboot and shutdown are unavailable rather than falling back to the read credential.

bash

homebutler proxmox status

Backups, and proving one comes back

bash

homebutler backup
homebutler backup list
homebutler backup drill <app>
homebutler backup drill --all
homebutler restore <archive>

backup drill is the one to reach for when somebody asks whether backups are trustworthy: it unpacks the archive into a container with a network and port of its own, starts the app on that data, and requires an HTTP health check to answer.

Installing apps

bash

homebutler install list
homebutler install <app>
homebutler install status <app>
homebutler install uninstall <app>
homebutler install purge <app>

Output and config

Every command takes --json. Commands that can reach another machine take --server <name> and --all.

Config is found in this order: --config <path>, $HOMEBUTLER_CONFIG, ~/.config/homebutler/config.yaml, ./homebutler.yaml. Sections: servers, wake, alerts, notify, proxmox, watch, backup.

bash

homebutler config validate

Prerequisites

Install a version, not whatever is newest at the moment the command runs. An agent that installs an unpinned executable cannot say what it ran.

bash

brew install Higangssh/homebutler/homebutler       # pinned formula, our own tap
go install github.com/Higangssh/homebutler@v0.39.0

Taking a release archive instead means checking it against the checksums the release publishes:

bash

V=0.39.0
BASE=https://github.com/Higangssh/homebutler/releases/download/v$V
curl -fsSLO $BASE/homebutler_${V}_linux_amd64.tar.gz
curl -fsSLO $BASE/checksums.txt
sha256sum --check --ignore-missing checksums.txt   # macOS: shasum -a 256 --check …
# must print: homebutler_0.39.0_linux_amd64.tar.gz: OK
tar xzf homebutler_${V}_linux_amd64.tar.gz

There is a container image, ghcr.io/higangssh/homebutler:0.39.0, pinned the same way.