Is Drawio Skill safe?
What Drawio Skill does
drawio-skill turns natural language and system sources such as Terraform, Kubernetes and docker-compose configs into editable .drawio architecture diagrams, with export, layout, validation and an optional MCP server. It is published in the Agents365-ai/drawio-skill repository. It runs Python scripts and a CLI that read your source files and write diagrams; live snapshots come from terraform show, docker inspect or kubectl, and icons load from the unpkg CDN unless --embed is used. Before installing, decide whether the agent may run the live-infrastructure commands, which query your deployed environment through your local terraform, docker and kubectl setup.
- Python shell/command execution
- Python filesystem write/delete
- Python filesystem read
What to do: Nothing here argues against installing it. Grant the capabilities it lists only if you expect the tool to need them.
Drawio Skill is an agent skill analyzed by SkillTotal's deterministic static scanner. The scan found no malicious indicators. It can: filesystem read, filesystem write, network egress and shell execution — capabilities are what the code can do, not a verdict on intent. Risk score 0/100 (low).
drawio-skill
Get notified when this component changes
Change alerts aren't live yet. Leave your email and we'll let you know when they launch. We use it only for this and delete it on request.
Automated static-analysis result. It can contain false positives and false negatives, and is not a claim about the intent of Drawio Skill's authors. Report a false positive.
Behavioral traits
How this component maps to the CSA agentic threat model. Descriptive — it never affects the risk score.
Findings (4)
The component can run operating-system commands or spawn processes.
proc = subprocess.run(
["dot", "-Tplain"], input=dot_src,
capture_output=True, text=True, check=True,
)r = subprocess.run([drawio, "-x", "-f", "png", "--page-index", "1",
"--width", "2000", "-o", png_path, src], capture_output=True)r = subprocess.run(
[sys.executable, os.path.join(HERE, "autolayout.py"), gpath, "-o", opath],
capture_output=True, text=True,
)proc = subprocess.run(cmd, text=True, capture_output=True)
p = subprocess.run(
[drawio, "--version"], capture_output=True, text=True, timeout=8
)proc = subprocess.run(cmd)
proc = subprocess.run(
[sys.executable, str(HERE / "drawiohtml.py"), args.input, "-o", args.output]
)proc = subprocess.run(
argv, capture_output=True, text=True, timeout=CALL_TIMEOUT_SECONDS
)r = subprocess.run([exe, "-x", "-f", "png", "--page-index", str(index),
"-s", str(scale), "-o", out_png, drawio_file],
capture_output=True)r = subprocess.run([exe, "-x", "-f", "svg", "--embed-svg-images",
"--page-index", str(index),
"-o", out_svg, drawio_file], capture_output=True)out = subprocess.run(
["tred"], input=dot, capture_output=True, text=True, check=True
).stdoutout = subprocess.run(
["tred"], input=dot, capture_output=True, text=True, check=True
).stdoutr = subprocess.run(
["git", "-C", repo, "diff", "--name-status", f"{base}..{head}", "--", "*.drawio"],
capture_output=True, text=True)r = subprocess.run(["git", "-C", repo, "show", f"{ref}:{path}"], capture_output=True)r = subprocess.run([drawio, "-x", "-f", "png", "--page-index", "1", "-o", out_png, src_drawio],
capture_output=True)r1 = subprocess.run([sys.executable, os.path.join(HERE, "drawiodiff.py"),
base_drawio, head_drawio, "-o", diff_json], capture_output=True)r2 = subprocess.run([sys.executable, os.path.join(HERE, "autolayout.py"),
diff_json, "-o", diff_drawio], capture_output=True)out = subprocess.run(["tred"], input=dot, capture_output=True,
text=True, check=True).stdoutout = subprocess.run(
["tred"], input=dot, capture_output=True, text=True, check=True
).stdoutr = subprocess.run([sys.executable, autolayout, graph_path],
capture_output=True, text=True)out = subprocess.run(
["tred"], input=dot, capture_output=True, text=True, check=True
).stdoutr = subprocess.run([drawio, "-x", "-f", "svg", "--embed-svg-images", "-o", out, path],
capture_output=True)out = subprocess.run(["tred"], input=dot, capture_output=True,
text=True, check=True).stdoutp = subprocess.run(["git", "-C", root, *args], capture_output=True)
imp = subprocess.run(
[sys.executable, os.path.join(HERE, importer + ".py"), work_path,
"-o", graph_json, *importer_args],
capture_output=True)Why it matters: Powerful and often legitimate — confirm the commands aren't built from untrusted input.
Fix: Confirm the command and its arguments are fully controlled and not derived from untrusted input; avoid shell=True.
The component reads files from disk.
with open(MANIFEST, encoding="utf-8") as f:
with open(path, encoding="utf-8") as handle:
with open(_PALETTE_FILE, encoding="utf-8") as fh:
with open(args.input, encoding="utf-8") as f:
with open(png_path, "rb") as f:
with open(args.input, encoding="utf-8") as f:
with open(path, encoding="utf-8") as f:
with open(path, encoding="utf-8") as f:
with open(opath, encoding="utf-8") as f:
with open(MANIFEST, encoding="utf-8") as f:
with open(MANIFEST, encoding="utf-8") as f:
with open(path, encoding="utf-8") as fh:
data = json.loads(p.read_text(encoding="utf-8"))
text = p.read_text(encoding="utf-8", errors="ignore")[:10000]
raw = json.loads(graph_path.read_text(encoding="utf-8"))
text = Path(path).read_text(encoding="utf-8")
with open(args.input, encoding="utf-8") as f:
with open(path, "rb") as f:
with open(out, encoding="utf-8") as f:
with open(args[0], "r", encoding="utf-8") as f:
with open(gomod, encoding="utf-8", errors="ignore") as f:
with open(path, encoding="utf-8", errors="ignore") as f:
with open(path, encoding="utf-8", errors="replace") as fh:
with open(path, encoding="utf-8") as f:
with open(path, encoding="utf-8", errors="ignore") as f:
Why it matters: Usually legitimate, but worth confirming it can't be steered into reading sensitive files.
Fix: Confirm which files are read and that paths cannot be influenced by untrusted input to reach sensitive locations.
The component writes or deletes files on disk.
with open(args.output, "w", encoding="utf-8") as handle:
with open(args.output, "w", encoding="utf-8") as f:
with open(f"{os.path.splitext(out)[0]}-frame{k + 1:03d}.png", "wb") as f:with open(out, "w", encoding="utf-8") as f:
with open(args.output, "w", encoding="utf-8") as f:
with open(args.output, "w", encoding="utf-8") as f:
with open(args.output, "w", encoding="utf-8") as f:
with open(gpath, "w", encoding="utf-8") as f:
with open(args.output, "w", encoding="utf-8") as f:
with open(MANIFEST, "w", encoding="utf-8", newline="\n") as f:
with open(path, "w", encoding="utf-8") as fh:
with open(path, "a", encoding="utf-8") as fh:
with open(output_path, "a", encoding="utf-8") as fh:
Path(output).write_text(text, encoding="utf-8")
Path(args.output).write_text(text, encoding="utf-8")
Path(args.output).write_text(
story_html(ir, title=args.title, scenario=scenario), encoding="utf-8"
)Path(args.output).write_text(story_html(ir, title=args.title), encoding="utf-8")
with open(args.output, "w", encoding="utf-8") as f:
with open(args.output, "w", encoding="utf-8") as f:
with open(args.output, "w", encoding="utf-8") as f:
with open(out, "w", encoding="utf-8") as f:
with open(args.output, "w", encoding="utf-8") as f:
with open(args.output, "w", encoding="utf-8") as f:
with open(args.output, "w", encoding="utf-8") as fh:
with open(args.output, "w", encoding="utf-8") as f:
Why it matters: Usually legitimate, but worth confirming the paths can't be controlled by untrusted input.
Fix: Confirm which files are written/deleted and that paths cannot be influenced by untrusted input.
The component makes outbound network requests.
import urllib.request
parsed = urllib.parse.urlparse(url)
return urllib.request.urlopen(safe_url(url), timeout=15).read()
import urllib.request
parsed = urllib.parse.urlparse(url)
req = urllib.request.Request(url, headers=headers)
with urllib.request.urlopen(req, timeout=30) as resp:
hosted = urllib.parse.urlparse(manifest.get("hostedBase", ""))Why it matters: Usually legitimate, but confirm the destinations are expected and no sensitive data leaves.
Fix: Confirm the destination hosts are expected and that no sensitive data is sent off-host.
How attackers abuse these capabilities
Interactive labs on the attack class behind the rules above. They show the technique, not anything found in Drawio Skill.
Maintain Drawio Skill?
The free Claude Code plugin scans each npm, PyPI or MCP package with this report's open-source engine before the install command runs. It runs on your machine and needs no account.
Check your own component
Run the same evidence-backed scan on any MCP server, agent skill, or package.
Scan your own componentHow we determine this: deterministic static analysis (regex + AST), evidence-anchored, no code execution. Methodology →