agentmods.dev

lxc-exec-ssh

A set of rules for running commands and managing virtual machines and containers in Proxmox. LXC is Proxmox's lightweight container system, while QEMU runs full virtual machines.

In plain words
What is it for?
Executing commands in LXC containers, finding the right container or virtual-machine tools, waiting for creation tasks, and handling Docker setup and permission errors.
Why use it?
It prevents agents from using unsupported Proxmox endpoints, confusing containers with virtual machines, or claiming Docker is ready when required privileges are missing.

Cursor rule for Cursor

1 15d ago A scan 0 tokens fork MIT
View the source file hackmods/cursor-proxmox-mcp
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add rules/hackmods/cursor-proxmox-mcp/lxc-exec-ssh
Clone the repo
git clone --depth 1 https://github.com/hackmods/cursor-proxmox-mcp

Made for: Cursor.

Per session 0 Nothing until a file matches its globs; then the whole rule loads.
When invoked 454 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin fork From a forked repository.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00000 $0.00454
Opus 5 $0.00000 $0.00227
Sonnet 5 $0.00000 $0.00091
Haiku 4.5 $0.00000 $0.00045

Measured 2d ago against content hash 52f203ec8c97, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

lxc-exec-ssh scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.cursor/rules/lxc-exec-ssh.mdc · 26 lines

What it actually says

LXC exec, guest IP, QEMU vs LXC

Hard facts (do not regress)

  • Proxmox has no REST endpoint for LXC shell. Never call /nodes/{n}/lxc/{vmid}/exec — it 501s.
  • execute_lxc_command = opt-in config ssh + host pct exec (paramiko). Clear error if SSH off.
  • get_vms is QEMU-only. LXC → get_containers or get_cluster_resources(type=vm).
  • Create returns UPID immediately — agents must wait_for_task before start (do not auto-wait inside create without a new decision).
  • keyctl/fuse beyond nesting are privilege-gated; do not silently strip flags.
  • Prefer bootstrap_docker_lxc when the user asks for a Docker LXC; fall back to raw create/prepare tools for debugging.
  • On keyctl 403: return structured feature_acl_denied with recommended_fallback: crun; use prepare_lxc_for_docker(docker_mode=auto|crun) or pct_set_lxc — never claim Docker-ready with nesting-only + stock runc.

When changing this area

  • Update D4/D24, agent-feedback-log.md, revisions.md, SETUP SSH section, SECURITY.
  • Prefer keys at create (ssh_public_keys), or set_lxc_password(enable_password_ssh=true) after start when host SSH/pct is on.
  • update_lxc_config does not set password/keys.
  • Create ≠ Docker/app deploy; keep success messaging honest.
  • Docker path: require nesting=1,keyctl=1 when ACL allows; if keyctl denied, install Docker with modern crun as default-runtime and report that fallback.
Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 26 lines · 0 tokens per session scan A 52f203ec8c97

Subscribe to this mod's changes

lxc-exec-ssh is a cursor rule published in the GitHub repository hackmods/cursor-proxmox-mcp (1 stars, last pushed 15d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 454 tokens. A static security scan graded it A with 0 findings. It comes from a forked repository.

DevOps and cloudLanguagescursorlxcmcpproxmoxqemu
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