Proximo

The Proxmox MCP you can hand the keys.

The others make you choose: a read-only inspector that's safe because it can't touch anything — or a loaded gun aimed at a cluster you care about. Proximo refuses the trade. Every dangerous move is planned (see the blast radius first) and proven (a tamper-evident record of every move), and undoable wherever the platform can snapshot (it snapshots before it acts) — trust built into the substrate, not bolted on after. Hand an AI agent the keys; keep the receipts.

What it does

Ask, in plain English, "why is ct 105 thrashing?" — and an AI agent pulls node and guest status, tails the logs, and runs a diagnostic inside the container to find out. If there's a fix, it shows you the plan before it touches anything, snapshots first, applies, and hands you a signed receipt of exactly what changed.

That's the product: a hypervisor an AI can operate without being able to wreck it. Read-only by default. No mutation without a plan first, and the plan refuses destructive ops. It snapshots before any state change, wherever the platform can snapshot. A tamper-evident receipt for every change. The comparison isn't Proximo vs. the GUI — it's Proximo vs. handing an LLM your root token and hoping.

Quickstart

// your MCP client config (Claude Desktop / Claude Code / Cursor / …)
{
  "mcpServers": {
    "proximo": {
      "command": "uvx",
      "args": ["proximo-proxmox"],
      "env": {
        "PROXIMO_API_BASE_URL": "https://your-pve:8006/api2/json",
        "PROXIMO_NODE": "your-node",
        "PROXIMO_TOKEN_PATH": "/path/to/token-file"   // USER@REALM!TOKENID=SECRET — by reference, never inlined
      }
    }
  }
}

Before wiring in an agent, check what your token can actually do (read-only preflight):

uvx proximo-proxmox doctor

Start with a read-only token — Proximo is useful long before you grant it write. Full token-first walkthrough (create the least-privilege token, verify, widen deliberately): SETUP.md. More install paths (pip, Docker/GHCR, from source): Install & run.

Why Proximo exists

Proxmox VE has a full REST API and a terse, powerful CLI — but the MCP landscape around it is split, and neither half is whole:

• API-based MCP servers give rich management (nodes, VMs, storage) but cannot run a command inside an LXC — that's a structural gap: the Proxmox REST API has no container-exec endpoint (it lives in lxc-attach, kernel namespaces, no REST surface).
• SSH-based MCP servers can exec in containers, but lean on broad shell access with little scoping.

Few build the principled one — both halves, on one clean surface, least-privilege, audited, trustworthy enough to point at a hypervisor you care about. That's the bar Proximo aims at. Proximo's specific bet is trust by construction across the whole control plane.

There is no official Proxmox MCP (and likely won't be soon — Proxmox ships the API+CLI and leaves integrations to the community, the same way there's no official Terraform provider). Proximo is a community project, standing on its own.

Four surfaces — one control plane

Those backends are deliberately boring — anyone can call them. The product is the trust layer over them.

The trust layer — what makes Proximo different

Safe-exec for Proxmox already exists elsewhere. Proximo's distinct angle is the trust layer for AI-driven infrastructure — four controls on by default, plus additional controls you opt into:

Beyond those four, a second set of controls exists but ships off until you configure them: independent per-plan CONSENT, a CONTAIN kill-switch, an arm-LEASE TTL, an arm-time target SCOPE, a per-surface FORBID/RATE ENVELOPE, and a content-trust TAINT control (the prompt-injection mitigation — once a session reads adversarial content, forbid a pre-declared action set outright or require out-of-band consent). They're inert with no env var set — full defaults table and what each one actually defends against: SECURITY.md.

Honesty note (load-bearing): PLAN's risk ratings are an advisory heuristic, not a sandbox. LOW means "does not change state," not "safe" — a read can still exfiltrate. The absence of a HIGH flag is not a safety signal; the destructive-pattern signatures are curated, not exhaustive. Review every change yourself.

The floor beneath all of the above: the token you mint. Every control in this table operates inside Proximo's own process — real protection, but bounded by what that process can do. The Proxmox RBAC token you hand Proximo is enforced by Proxmox itself, so it holds even if Proximo's process is fully compromised — scope it to read-only, or to exactly the write surface you mean to grant. That's a different, stronger guarantee than anything Proximo's own code provides. Full breakdown: SECURITY.md.

At scale

One container is the demo. A cluster is the point.

• The whole cluster in one call. pve_cluster_resources returns every VM, node, storage pool, and SDN object across the cluster — so the agent answers "what's the state of everything?" in one breath, not node by node.
• One tamper-evident record of every change, across every node. This is what a human at the CLI never walks away with: every mutation Proximo makes — any node, any operator or agent — lands in a single hash-chained PROVE ledger, and audit_verify proves it wasn't edited, reordered, or truncated. "Show me every state-changing action on the cluster this month, and prove the log wasn't touched" becomes a query you can actually answer.
• Where the time comes back. On one node, a senior at the CLI is faster — and that's fine. Across a dozen nodes and hundreds of guests the tedium multiplies and there's no unified record; that's where delegating execution to a bounded, audited agent earns its keep.

Live-proven against real Proxmox infrastructure: PVE 9.2 (3-node cluster — offline guest migration, HA lifecycle, governance plane), PBS 4.2 (datastores, snapshots, GC, namespaces, prune/verify, sync), PMG 9.1 (auth, read shapes, CRUD cycles, service control, RuleDB, quarantine), and PDM (read-only federated fleet — remotes, aggregate resources, tasks/access, per-remote PVE/PBS reads — against a Datacenter Manager federating 3 PVE remotes + 1 PBS) — every step recorded and verified through PROVE.

Honest scope: The single-cluster view above (pve_cluster_resources, one ledger across its nodes) is per-endpoint — "fleet" there means a cluster and its nodes. To reach separate, independent clusters from one Proximo, use native multi-target: each call names its box, so one process spans many clusters while every call still lands on exactly one.

Principles (the mantra, baked in — not bolted on)

• Ethical — least-privilege posture (exec off by default; bounded by the token you scope), every action audited, mutations confirm-gated, the PVE token read only at call time, never logged or persisted.
• Solid — real tests (unit + a live smoke against a throwaway CTID), typed, documented, no silent failures.
• Strong — does the hard thing (container exec) cleanly and least-privileged (fail-closed CTID allowlist, opt-in). (Container exec isn't unique — the field leader has it too; the differentiator is the trust layer below, not the exec.)
• Passion + craft — redteamed and linted before it's called done; shipped proud — docs, license, community-ready.

Install & run

🧭 New to Proximo? Start with SETUP.md — a beginner-proof, token-first walkthrough: create a least-privilege (read-only) token, verify what it can/can't do with proximo doctor, then grant scoped write only when you're ready. The token is the floor your keys never leave.

📦 0.15.0 — on PyPI, GitHub, and GHCR (signed multi-arch image).

New in 0.15.0 — cert-fingerprint pinning on every surface. Pin any Proxmox box Proximo talks to — PVE · PBS · PMG · PDM — by its exact certificate instead of shipping a CA. Wire-enforced and live-proven against real hardware: a mismatched cert closes the socket before your token is sent. The self-signed operator's answer. Plus a packaged, tested .deb.

Recent: 0.14.1 trimmed and hardened the tree — plans and the ledger now disclose the exact field a mutation changes, with secrets kept out of both. 0.14.0 added scoped registration (PROXIMO_SURFACES loads only the planes you use). See SECURITY.md for which controls are on by default and what each honestly holds.

Proximo runs on your machine (wherever your MCP client lives), on demand — like every other Proxmox MCP.

The pip package is proximo-proxmox (PyPI's bare proximo is reserved); the command and import stay proximo. With the [a2a] extra you also get the proximo-a2a server.

Install:

uvx proximo-proxmox          # zero-install run, on demand
# or: pip install proximo-proxmox        (adds the `proximo` + `proximo-a2a` commands)
# or: pip install "proximo-proxmox[a2a]" (also installs the optional A2A face)

Wire it into your MCP client (Claude Desktop/Code, Cursor, …) as the command proximo (or python -m proximo), with the PROXIMO_* env vars — see packaging/proximo.env.example.

From source:

git clone https://github.com/john-broadway/proximo.git && cd proximo
uv pip install -e .          # or: pip install -e .

Docker (GHCR): docker run -i --rm … ghcr.io/john-broadway/proximo:latest runs the stdio MCP server on demand — no daemon, no open port. Multi-arch (amd64 + arm64), shipped with an SBOM and a sigstore-signed build-provenance attestation (gh attestation verify oci://ghcr.io/john-broadway/proximo --owner john-broadway).

Safe by default: Proximo is API-only out of the box. The near-root edges are opt-in and say so plainly: the LXC exec edge (PROXIMO_ENABLE_EXEC=1) grants near-root on the host, and the VM qemu-guest-agent edge (PROXIMO_ENABLE_AGENT=1) grants near-root inside a guest.

Big surface, scoped context: 352 tools is the whole estate — you don't have to load it. PROXIMO_SURFACES=pve,exec registers only those planes (e.g. that pair = 194 tools; pbs,exec = 38) — unpicked planes are removed from the registry before serving, so they never touch your context window. audit_verify always stays; a typo'd surface name refuses startup instead of silently serving the wrong set.

The default path never touches the hypervisor host — management goes over the Proxmox API (scoped token). The two opt-in edges are the exceptions: exec uses your existing ssh to PVE to run pct exec as root on the host; the qemu-agent edge runs in-guest ops via the API. Both are off by default, each scoped by its own fail-closed allowlist (PROXIMO_CT_ALLOWLIST / PROXIMO_AGENT_ALLOWLIST), and say so loudly.

(A Debian package is deferred/optional — the MCP world installs via uvx/pip/Docker, not apt. Status: debian/ is a packaging scaffold, not yet installable — dpkg-buildpackage won't produce a working .deb until the bundled-venv step is finished; see debian/README.Debian.)

Multiple targets (one Proximo, many boxes)

By default one Proximo talks to one box (the PROXIMO_* env). To reach several Proxmox remotes — internal and external, any of the four planes — register them in a TOML file and point PROXIMO_TARGETS at it (see packaging/targets.example.toml):

[targets.edge-pve]
kind       = "pve"
base_url   = "https://edge.example.com:8006/api2/json"
node       = "edge"
token_path = "/etc/proximo/edge-pve.token"   # secret BY REFERENCE — never inlined

Then aim any tool at a named remote with proximo_target:

pve_guest_power(vmid=131, action="reboot", proximo_target="edge-pve")

• Omit proximo_target (the default) and behavior is exactly as today — the env box, unchanged.
• The target travels with the call, so PLAN and EXECUTE always hit the same box, and the PROVE ledger records which box (remote) every op touched.
• Kind-checked: a pbs_* tool given a pve target errors — no silent cross-plane call.
• Secrets stay by reference (token_path / password_path); the registry holds no secret values.
• Arming is per-target and out-of-band (your hand): it swaps the operator token at that target's token_path. Proximo's code only ever reads whatever token is there.
• In-container exec (ct_exec/ct_psql/ct_logs/ct_diagnose) is target-aware too, but it runs pct exec over SSH — so a targeted call needs that target SSH-reachable with enable_exec + an ssh_target set in its registry entry. An external, API-only box won't serve pct exec.

Status — the arena record

• 🩸 0.15.0 — cert-fingerprint pinning across all four surfaces (PVE · PBS · PMG · PDM), wire-enforced and live-proven against real hardware. Plus the first packaged, tested .deb.
• 🩸 0.14.1 — the trim + harden patch. Plans and the ledger now show the actual field changes, and carry no secrets. 57 verified fixes, +74 tests, plus the doctor spine report.
• 🩸 0.14.0 — scoped registration: PROXIMO_SURFACES loads only the planes you use.
• 🩸 0.13.0 — the zero-trust arc: CONTAIN · CONSENT · SCOPE · LEASE · ENVELOPE · TAINT, all opt-in and fail-closed. Plus the off-box PROVE anchor.
• Earlier: native multi-target (one instance → many PVE/PBS/PMG/PDM boxes) and the ACME plane grew the tree to its current 352 tools; 0.1.1 "Spaniard" was the first public cut, 2026-06-10.

The four on-by-default controls (PLAN · PROVE · UNDO · DIAGNOSE) are built and redteamed. The opt-in six (CONSENT · CONTAIN · LEASE · SCOPE · ENVELOPE · TAINT — see SECURITY.md) ship off until configured.

The numbers, honestly: 352 MCP tools. 5,000+ tests, ruff + pyright clean — but those tests are mock/in-process: they prove the shapes, not live behavior. The real-Proxmox proofs below are a separate, by-hand live-smoke harness — not in that count, not in CI.

The blast-radius engine carries the destructive surface. Across eleven op-classes it names the specific guests, nodes, ACL principals, or disks a dangerous op would harm — nothing falls back to a bare confirm.

Proven against real Proxmox (not mocks):

• The trust spine end-to-end, the core provisioning/config mutate cycle, and PBS read shapes.
• The governance/dangerous plane — identity (roles/groups/users/ACLs), storage, SDN pending objects (zone/vnet/subnet create→read→delete), realm create (LDAP/AD/OpenID via an options dict) — full create→read→delete cycles against a real PVE 9.2 API, PROVE ledger verified throughout. (SDN/network apply — the host-network reload — is deliberately never fired live; it carries unrecoverable risk.)
• The object planes — firewall objects (aliases/IP-sets/security-groups/options), HA rules (the PVE 9 replacement for HA groups), and SDN zones/VNets/subnets (pending, pre-apply) — create→read→delete live-proven against a real PVE 9.2 node; TFA admin reads proven (TFA mutation is ticket-gated by PVE, not token-accessible).
• Offline guest migration (including local-disk) and the HA-config lifecycle on a 3-node PVE 9.2 test cluster.
• PBS 4.2 — datastores, namespaces, snapshot list/delete/notes/protect, GC, prune, verify, sync jobs, and traffic control — live-proven against the test PBS instance.
• PMG 9.1 — auth (ticket + CSRF flow), node status/syslog/RRD, mail statistics, quarantine (spam/virus/attachment list, deliver/delete/blocklist/welcomelist via pmg_quarantine_action), domain/transport/mynetworks/spam-config CRUD, service status + restart cycle, RuleDB paths (groups/objects/rules/ordering) — W1–W5 live-smoke rounds, including safe mutations with full create→verify→clean-up cycles.
• Both protocol faces driven by real clients end-to-end: MCP over stdio, and A2A by the official a2a-sdk.

Not yet proven — said plainly: the remaining 352-tool surface runs against mocks for shapes the live smokes don't reach: real HA fencing (needs a hardware watchdog), online live-migration (needs shared storage), and behavior at production scale.

The A2A face (experimental, opt-in): pip install 'proximo-proxmox[a2a]', then proximo-a2a — a curated 16-skill slice over Agent2Agent that routes through the same trust core (PLAN/PROVE/UNDO inherited; there is no second code path to bypass). Fail-closed perimeter: non-localhost binds are refused without a bearer token (PROXIMO_A2A_TOKEN_FILE); Host-header allowlist defends against DNS rebinding. Ledger note: the ledger is keyed (HMAC-SHA256) by default (PROXIMO_AUDIT_KEYED, opt out with off) — tamper-evident, not tamper-proof — and an off-box head() anchor (PROXIMO_AUDIT_EXPECTED_HEAD) is the strong guarantee for tail attacks. ct_psql records the SQL body and ct_exec the command argv it runs (the operator's own input) for a complete audit trail; set PROXIMO_LEDGER_REDACT=1 to record a fingerprint (sha256 + kind + length) instead, when the SQL/command may carry secrets/PII. The PVE API token is never written to the ledger.

What's next

• HA fencing (softdog) + online live-migration over shared storage — queued for the nested-cluster lab. Real hardware-watchdog fencing still waits on real hardware.
• Debian package polish: a man page + archive-quality gates (autopkgtest, lintian --pedantic). The package itself now builds and installs — see debian/README.Debian.
• PBS certificate-fingerprint wire-enforcement — done: the pin is checked on the handshake; a mismatch refuses before the token is sent.

The full build history — every pillar, every redteam, every fix — lives in CHANGELOG.md.

License

Apache-2.0 — chosen for the patent grant that suits infrastructure tooling. Full text in LICENSE.

Credits

Named for Proximo, the lanista of Gladiator — the man who armed the fighter with exactly what he needed, never more, and answered for every move in the arena. That is the whole design: give the operator — human or agent — the reach to act, never the run of the house, accountable for all of it.

"Win the crowd and you will win your freedom."

Built by John Broadway with Claude and Maude — a human–AI partnership, and the first thing we made on this box to give away to the world.

Claude's contribution spans eras, credited honestly: Claude Opus 4.8 built the trust pillars and the original tool surface (June 2026) and has carried the work since — the Backup Server, Mail Gateway, and Datacenter Manager planes, native multi-target, and the security hardening; Claude Fable 5 ran the 101-agent release audit and the first publish. Every commit carries its co-author trailer.

"Are you not entertained?" — stars, issues, and sparring partners welcome. Strength and honor. ⚔️