MCP, MCP server
Frugal
The open routing layer for AI tools.
Compatibility: Not stated.
Grade C
One Medium finding. Read the findings before installing.
Not a guarantee. A hygiene check of the source at the commit shown, not a security audit.
INSTALL_REMOTE_SCRIPT
Why this grade
- INSTALL_REMOTE_SCRIPT Medium
Fetches a script from the network and runs it (a pipe to a shell, or an install hook with a URL).
.github/workflows/install-smoke.yml, line 57
curl -fsSL https://frugal.sh/install | bash -s uninstall
Any High, or two or more Medium findings, give D. One Medium gives C. Low findings or a security Note give B. Each code names a finding behind the letter.
Grades are a hygiene check of the source at the commit shown, on the date checked, not a security audit or a guarantee. The free directory grades are automated. Before release, a PlugVet engineer reviews every paid report and any grade we hold back, including all F grades, against the source code and the evidence we quote.
What was checked
Plain notes from the hygiene checks.
Permissions
Note
requests shell access. The manifest names this permission.
PERMISSION_SHELL_DECLARED
internal/install/install.go, line 209
return exec.Command("claude", args...).CombinedOutput()
pipeline/run_pipeline.py, line 27
result = subprocess.run(cmd, env=env)
Install and update
Serious
install fetches a script from the network. README documents an installer that pipes a download into a shell. The docs document an installer that pipes a download into a shell.
INSTALL_REMOTE_SCRIPT INSTALL_DOCUMENTED_INSTALLER
README.md, line 24
curl -fsSL https://frugal.sh/install | bash
content/blog/posts/frugal-open-routing-layer.md, line 112
curl -fsSL https://frugal.sh/install | bash
.github/workflows/install-smoke.yml, line 57
curl -fsSL https://frugal.sh/install | bash -s uninstall
Show more
docs/install.sh, line 5
# curl -fsSL https://frugal.sh/install | bash
docs/install.sh, line 6
# curl -fsSL https://frugal.sh/install | bash -s uninstall
docs/install.sh, line 456
printf ' \033[2muninstall: curl -fsSL https://frugal.sh/install | bash -s uninstall\033[0m\n'
.github/workflows/install-smoke.yml, line 98
curl -fsSL https://frugal.sh/install | bash
docs/.well-known/agent-skills/frugal/SKILL.md, line 68
curl -fsSL https://frugal.sh/install | bash
docs/.well-known/mcp/server-card.json, line 21
"shell": "curl -fsSL https://frugal.sh/install | bash",
docs/_redirects, line 3
# /install.sh so `curl -fsSL https://frugal.sh/install | bash` gets the script
docs/blog/frugal-open-routing-layer/index.html, line 146
<pre><code>curl -fsSL https://frugal.sh/install | bash
docs/index.html, line 126
<pre><code>curl -fsSL https://frugal.sh/install | bash
docs/index.html, line 127
frugal mcp install</code><button class="copy" type="button" data-copy="curl -fsSL https://frugal.sh/install | bash
Network
Concern
can reach a host that is not written as a fixed address.
NETWORK_NO_FIXED_HOST
config/embed.go, line 6
// This is the same file the curl installer drops at
docs/install.sh, line 79
if command -v curl >/dev/null 2>&1; then
docs/install.sh, line 80
curl -fsSL "$url" || fail "failed to fetch $url" "$EXIT_NETWORK"
Show more
docs/install.sh, line 81
elif command -v wget >/dev/null 2>&1; then
docs/install.sh, line 82
wget -qO- "$url" || fail "failed to fetch $url" "$EXIT_NETWORK"
docs/install.sh, line 84
fail "curl or wget is required" "$EXIT_NETWORK"
docs/install.sh, line 90
if command -v curl >/dev/null 2>&1; then
docs/install.sh, line 91
curl -fsSL "$url" -o "$dest" || fail "failed to download $url" "$EXIT_NETWORK"
Secrets
Concern
reads a credential or environment file.
SECRETS_ENV_READ SECRETS_PATH_DOTENV
cmd/frugal/mcp.go, line 216
AuthToken: os.Getenv("FRUGAL_AUTH_TOKEN"),
pipeline/llm.py, line 29
self.api_key = api_key or os.environ.get("FRUGAL_GEN_API_KEY", "")
content/blog/posts/byok-agent-tooling.md, line 49
BYOK hands you jobs a platform would have done. You sign up with each provider yourself. You store keys properly - environment variables or a secrets manager, not a committed `.env
Show more
docs/blog/byok-agent-tooling/index.html, line 88
<p>BYOK hands you jobs a platform would have done. You sign up with each provider yourself. You store keys properly - environment variables or a secrets manager, not a committed <c
Agent instructions
Pass
No instruction to ignore earlier instructions or to hide a step.
Obfuscation
Note
a file was over the read cap and was not fully read.
OBFUSCATION_FILE_OVER_READ_CAP
bloggen, line 1
ELF > @�G @ � @ 8 @ @ @ @ @ @ P P x x@ x@ d d
pipeline/data/train.jsonl, line 1
{"text": "extract the terms from the policy page i linked", "label": "extract.url", "source": "stage2", "persona": "research agent", "domain": "legal", "style": "imperative sentenc
Licence
Pass
A licence file is present (LICENSE).
Maintainer activity
Pass
The latest commit is within the last 365 days.
Note
Hygiene check of commit 54564148f824. requests shell access. The manifest names this permission. install fetches a script from the network. README documents an installer that pipes a download into a shell. The docs document an installer that pipes a download into a shell. can reach a host that is not written as a fixed address. reads a credential or environment file. a file was over the read cap and was not fully read.
Date and source
Date checked:
github.com
Commit graded: 54564148f8243a9adf4d2cf7b57b008edbf37606
This link goes to the original host. PlugVet does not host or check what you download from there, and installing it is your own decision and risk.