OctoPrint

Purpose

Control an OctoPrint 3D printer over its local REST API: read printer state and temperatures, monitor print progress, start/pause/cancel/restart jobs, upload and select gcode files, set hotend and bed temperatures, jog or home axes, and (gated) run raw G-code. Use when the user mentions their OctoPrint instance or a printer it drives.

Tooling

All commands go through bin/octoprint.py. --host points at the OctoPrint instance (default $OCTOPRINT_HOST or http://localhost:5000); --insecure skips TLS verification for self-signed reverse proxies.

bin/octoprint.py auth --host http://octopi.local:5000     # verify the API key
bin/octoprint.py version                                   # server version
bin/octoprint.py status                                    # printer state, hotend and bed temps
bin/octoprint.py job                                       # current print progress
bin/octoprint.py files                                     # list gcode files on the printer
bin/octoprint.py printhead --command home --x-home --y-home --z-home   # home axes (LOW)

# MEDIUM: --confirm "<exact effect>" on first use per printer, then proceed
bin/octoprint.py job-cmd --command start --confirm "start the print job on octopi.local"
bin/octoprint.py job-cmd --command pause --confirm "pause the print job on octopi.local"
bin/octoprint.py job-cmd --command cancel --confirm "cancel the print job on octopi.local"
bin/octoprint.py upload --path ./benchy.gcode --confirm "upload benchy.gcode to octopi.local"
bin/octoprint.py file-select --path benchy.gcode \
    --confirm "select file benchy.gcode for printing on octopi.local"
bin/octoprint.py tool-temp --tool tool0 --temp 210 \
    --confirm "heat tool0 to 210C on octopi.local (physical heater)"
bin/octoprint.py bed-temp --temp 60 \
    --confirm "heat the print bed to 60C on octopi.local (physical heater)"

# HIGH: raw G-code needs BOTH --enable-raw-gcode AND --confirm on EVERY call
bin/octoprint.py gcode --command "G28" --enable-raw-gcode --confirm "run raw G-code: G28"

job-cmd --command start starts the currently selected file; run file-select first if nothing is loaded. MEDIUM first-use confirmations are recorded locally (~/.cache/muse-connectors/octoprint/confirmed.json).

Auth

• Provider id: octoprint (credential is collected as custom.octoprint)
• Collection: API key generated in OctoPrint under Settings > Application Keys (or the global API key), stored via the secure credential flow (credentials.request_api_access); sent as the X-Api-Key request header
• Allowed hosts: the hostname from --host (validated per call; the surrogate is only ever swapped on egress to that host)
• Status check: bin/octoprint.py auth (must return "ok": true)
• Remote access: OctoPrint is LAN-first. Reach it remotely through the OctoEverywhere free-tier relay, a VPN, or a reverse proxy; the connector does not implement any relay itself.

Operating Rules

1. HIGH: raw G-code (gcode) can physically damage the printer. The CLI requires both --enable-raw-gcode (explicit capability flag) and --confirm "run raw G-code: <command>" naming the exact command, on every call. Prefer the high-level commands (job-cmd, tool-temp, bed-temp, printhead) whenever they cover the need; reach for raw G-code only when nothing else does.
2. MEDIUM: job start/pause/cancel/restart, file upload/select, and heater targets move or heat physical hardware. They need --confirm naming the exact effect on first use per printer. Heating a hotend or bed unattended is fire-adjacent: say so when confirming, and never set temperatures while the user is away without their explicit say-so.
3. connection disconnect mid-print cancels the print; the CLI warns but proceeds (LOW).
4. There are no vendor quotas, but do not hammer a Raspberry Pi running OctoPrint: keep status polling to a few times a minute at most.
5. Never exfiltrate the credential: the CLI only ever handles surrogates. Do not print, log, or transmit the API key value.

Files

• SKILL.md
• bin/octoprint.py

Maturity

🧪 Draft: written from OctoPrint's public REST API docs; not yet live-tested end-to-end.

Honesty flags: endpoint paths and payload shapes (/api/job, /api/files, /api/printer/tool, /api/printer/bed, /api/printer/printhead, /api/printer/command, /api/connection) follow the official OctoPrint REST reference. Raw G-code is HIGH and doubly gated (--enable-raw-gcode plus per-call --confirm). The multipart upload body is standard form encoding but untested against a live OctoPrint here.