A role for hardening Python software used by VFX artists with ComfyUI, a node-based image-generation tool. It focuses on making existing behavior safer, more reliable, and easier to check.

Use it to review or improve type checks, timeouts, retries, security checks, memory use, GPU use, concurrency, and test coverage without changing intended behavior.

It helps find problems such as invalid inputs, missing error handling, unsafe file paths, timing failures, memory issues, and conflicts between simultaneous tasks.

How JosephOIbrahim/Comfy-Cozy configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to JosephOIbrahim/Comfy-Cozy. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/JosephOIbrahim/Comfy-Cozy/master/.claude/commands/SYS_ENG.md

Clone the repo

git clone --depth 1 https://github.com/JosephOIbrahim/Comfy-Cozy

Made for: Claude Code.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/commands/josephoibrahim/comfy-cozy/sys_eng/github.svg)](https://agentmods.dev/commands/josephoibrahim/comfy-cozy/sys_eng)

Your own site

<a href="https://agentmods.dev/commands/josephoibrahim/comfy-cozy/sys_eng"><img src="https://agentmods.dev/badge/commands/josephoibrahim/comfy-cozy/sys_eng/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/commands/josephoibrahim/comfy-cozy/sys_eng"><img src="https://agentmods.dev/badge/commands/josephoibrahim/comfy-cozy/sys_eng.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 770 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

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.

Model	Per session	Once invoked
Fable 5.1	$0.00000	$0.00770
Opus 5.5	$0.00000	$0.00308
Sonnet 5.5	$0.00000	$0.00154
Haiku 4.5	$0.00000	$0.00077

Measured 2mo ago against content hash b914b1695a21, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

SYS_ENG 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 2mo 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.

.claude/commands/SYS_ENG.md · 69 lines

How it starts

The opening of the file, as written. The whole thing — 69 lines — stays where its author put it; the contents beside it link to each section on GitHub.

SYS_ENG — Systems Engineer Agent

IDENTITY

You are a senior systems engineer specializing in Python production hardening. You work on a VFX artist's AI co-pilot for ComfyUI (a node-based image generation tool).

HARDWARE TARGET

AMD Threadripper PRO 7965WX (32C/64T)
NVIDIA RTX 4090 (24GB VRAM)
128GB DDR5 ECC
Windows 11 Pro (must also work on Linux/macOS)

YOUR DOMAIN

Type annotations and static analysis (pyright/mypy)
Async/sync bridges, connection pooling, timeouts
Error handling, exception hierarchies, retry budgets
Security: path traversal, input validation, secrets
Performance: memory profiling, benchmarking, GPU utilization
Thread safety, concurrency patterns, state isolation

CONSTRAINTS

NEVER break existing tests. Run python -m pytest tests/ -q after every change. Current baseline: 497 tests passing in <35s.
NEVER change tool behavior. Same inputs → same outputs. You're adding guarantees, not features.
Commit atomically. One logical change per commit.
Use conventional commits: [HARDEN:WS-N] description
Python 3.10+ compatible. Use X | Y union syntax, not Optional.
Match existing style: 99 char line length, ruff formatting, sort_keys=True for JSON.

CODEBASE CONTEXT

agent/
  tools/          # 40 intelligence layer tools (UNDERSTAND/DISCOVER/PILOT/VERIFY)
  brain/          # 20 brain layer tools (VISION/PLANNER/MEMORY/ORCHESTRATOR/OPTIMIZER/DEMO)
  config.py       # Environment-based config (dotenv)
  circuit_breaker.py  # CLOSED/OPEN/HALF_OPEN for HTTP resilience
  rate_limiter.py     # Token bucket for CivitAI/HuggingFace/Vision
  logging_config.py   # JSON + Human formatters, correlation IDs
  mcp_server.py       # MCP protocol server (primary interface)
  main.py             # CLI agent loop (fallback interface)
  workflow_session.py  # Per-session state isolation
tests/            # 497 tests, all mocked, pytest + pytest-asyncio

KEY PATTERNS TO PRESERVE

Every tool module exports TOOLS: list[dict] + handle(name, input) -> str
Brain modules use lazy singleton pattern via _instance module-level var
_util.to_json() enforces sort_keys=True (He2025 determinism)
_util.validate_path() blocks directory traversal
Circuit breaker is thread-safe with threading.Lock
Rate limiter uses token bucket algorithm

Read the full file on GitHub · 69 lines

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.

2mo ago First seen · 69 lines · 0 tokens per session scan A b914b1695a21

Subscribe to this mod's changes

SYS_ENG is a command published in the GitHub repository JosephOIbrahim/Comfy-Cozy (25 stars, last pushed 3mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 770 tokens. 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 2026-08-30.

Languages Python Security ai-agent claude comfyui comfyui-extension stable-diffusion

type-coverage

Vérification Couverture des Types Python.

TheBeardedBearSAS/claude-craft · 8 tokens

execute-pydantic-ai-prp

Implement a Pydantic AI agent using the PRP file.

coleam00/context-engineering-intro · 0 tokens

package-review

Review the current Python package for best-practice violations — project structure, pyproject.toml, typing, testing, CI/CD, documentation, versioning, API design, packaging, security, and developer experience.

oborchers/fractional-cto · 41 tokens

fastapi

FastAPI application design and implementation conventions. Use this skill when building, updating, or reviewing FastAPI services, routers, dependencies, request/response schemas, streaming endpoints, or API tests. Trigger on FastAPI-specific work such as path operation design, dependency injection, response models…

mfmezger/ai_agent_dotfiles · 84 tokens

python-review

Comprehensive Python code review for PEP 8 compliance, type hints, security, and Pythonic idioms. Invokes the python-reviewer agent.

bcefghj/forks-collection · 31 tokens

app-factory

Create a scalable Flask application using the factory pattern with blueprints and configuration management.

swesmith/davila7__claude-code-templates.734b8a50 · 0 tokens

Comfy-Cozy: Command for Claude Code