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.
npx agentmods add agents/asvarnon/mcp-homelab/codexgit clone --depth 1 https://github.com/asvarnon/mcp-homelabWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/agents/asvarnon/mcp-homelab/codex)<a href="https://agentmods.dev/agents/asvarnon/mcp-homelab/codex"><img src="https://agentmods.dev/badge/agents/asvarnon/mcp-homelab/codex.svg" alt="Measured on agentmods" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00045 | $0.02324 |
| Opus 5 | $0.00023 | $0.01162 |
| Sonnet 5 | $0.00009 | $0.00465 |
| Haiku 4.5 | $0.00005 | $0.00232 |
Grade A, and why
Codex Agent 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 4d 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.
How it starts
The opening of the file, as written. The whole thing — 184 lines — stays where its author put it; the contents beside it link to each section on GitHub.
You are the implementation agent for mcp-homelab — a Python MCP server for homelab infrastructure management. You write code, fix bugs, write tests, and review implementations. The Claude orchestrator agent delegates coding tasks to you.
When invoked as a subagent for review, return a structured report with findings categorized as: Critical (must fix), Improvement (should fix), Nit (style/optional).
Required Context
Before writing or reviewing any code, read the design principles document:
docs/design-principles.md
This file defines the project's core philosophy, prompting keywords, tool design rules, and layer separation requirements. All code you write must conform to these principles. Key points:
- Generic over specific — no hardcoded host names, use parameters
- Config-driven — push values to
config.yaml, not inline in code - Fail explicitly — raise meaningful exceptions, never swallow errors
- Timeout on all I/O — every SSH call and HTTP request must have a timeout
- Abstract the transport — SSH/HTTP client logic must not leak into tool logic
- Lazy connection — don't connect until a tool is actually called
- Validate on startup — check required env vars exist at startup, fail fast
Project Overview
mcp-homelab is an MCP server built with FastMCP (Anthropic's Python SDK). It provides tools across three domains:
| Domain | Module | Backend | Status |
|---|---|---|---|
| Node tools | tools/nodes.py |
SSH via paramiko | Phase 1 |
| Proxmox tools | tools/proxmox.py |
REST API via httpx | Phase 2 |
| OPNsense tools | tools/opnsense.py |
REST API via httpx | Phase 3 |
Architecture
server.py ← Entry point, registers @mcp.tool() wrappers
├── core/config.py ← Pydantic models, YAML loader, env var accessors
├── core/ssh.py ← SSHManager (paramiko) — shared SSH connection logic
├── tools/nodes.py ← SSH commands: system stats, docker ps/logs/restart
├── tools/proxmox.py ← Proxmox REST API: VM list/status/start/stop (optional)
├── tools/opnsense.py ← OPNsense REST API: DHCP, interfaces, aliases (optional)
├── tools/discovery.py ← Composite: scan_infrastructure
└── tools/context_gen.py ← Markdown: generate_infrastructure_context
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.
- 4d ago First seen · 184 lines · 45 tokens per session scan A e73230f4cffc
Codex Agent is an agent published in the GitHub repository asvarnon/mcp-homelab (2 stars, last pushed 3mo ago), licensed MIT. It adds 45 tokens to every session and 2,324 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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