MCP, MCP server
metatron
metatron, an MCP server listed in the PlugVet directory.
Compatibility: Not stated.
Grade D
Two or more Medium findings, or a High. Only try it in a sandbox.
Not a guarantee. A hygiene check of the source at the commit shown, not a security audit.
PERMISSION_SHELL_UNDECLARED INSTALL_REMOTE_SCRIPT
Why this grade
- PERMISSION_SHELL_UNDECLARED Medium
Runs shell commands that the manifest or description does not mention.
metatron/cli.py, line 827
show = subprocess.run( - 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).
README.md, line 177
curl -sSf https://getmetatron.com/install.sh | sh
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.
If you think this grade is wrong, email [email protected] with the entry link and your evidence. We aim to acknowledge within two working days and decide within seven. If we confirm an error, we aim to correct it within 24 hours of confirming it. These are aims, not guarantees.
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
Concern
requests shell access. No manifest field names shell or command execution. can delete files.
PERMISSION_SHELL_UNDECLARED PERMISSION_DELETE_FILES
metatron/cli.py, line 827
show = subprocess.run(
metatron/context_setup.py, line 319
out = subprocess.run(
metatron/context_setup.py, line 396
shutil.rmtree(dest)
Show more
metatron/identity.py, line 93
result = subprocess.run(
metatron/pipeline.py, line 219
result = subprocess.run(args, capture_output=True, text=True, check=True)
metatron/repo_identity.py, line 41
result = subprocess.run(
metatron/version.py, line 34
result = subprocess.run(
metatron/version.py, line 179
runner = runner or subprocess.run
Install and update
Serious
install fetches a script from the network.
INSTALL_REMOTE_SCRIPT
README.md, line 177
curl -sSf https://getmetatron.com/install.sh | sh
Network
Concern
can reach a host that is not written as a fixed address.
NETWORK_NO_FIXED_HOST
metatron/version.py, line 207
with urllib.request.urlopen(
metatron/version.py, line 217
return fetch(timeout)["info"]["version"]
metatron/webui/app/api.js, line 8
fetch(url).then((r) => {
Show more
metatron/webui/app/api.js, line 13
fetch(url, {
docs/plans/2026-06-09-curation-ux-improvements.md, line 474
On reload, render one inline review per object in `e.produced` (already full decisions - no fetch). For a *just-refined* gap, you only have ids from `doRefine`'s return, so fetch t
docs/plans/2026-06-09-version-and-update-notice.md, line 270
def fetch(timeout):
docs/plans/2026-06-09-version-and-update-notice.md, line 315
with urllib.request.urlopen(
docs/plans/2026-06-09-version-and-update-notice.md, line 325
return fetch(timeout)["info"]["version"]
Secrets
Concern
reads a credential or environment file.
SECRETS_ENV_READ SECRETS_PATH_DOTENV
metatron/cli.py, line 135
# Load a .env from the working directory (does not override exported vars),
metatron/config.py, line 84
anthropic_api_key=os.environ.get("ANTHROPIC_API_KEY"),
.dockerignore, line 1
# Secrets and local state - must never enter the image
Show more
.dockerignore, line 2
.env
.gitignore, line 150
# Environments
.gitignore, line 223
# Metatron - local decision store (SQLite); secrets go in .env (ignored above)
README.md, line 287
**Secrets** come from the environment only. The CLI auto-loads a `.env` from the
README.md, line 288
working directory (it never overrides an already-exported variable, and `.env` is
README.md, line 292
# .env in the repo root
Agent instructions
Pass
No instruction to ignore earlier instructions or to hide a step.
Obfuscation
Pass
No encoded or minified payload found.
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 b1e3789137b2. requests shell access. No manifest field names shell or command execution. can delete files. install fetches a script from the network. can reach a host that is not written as a fixed address. reads a credential or environment file.
Date and source
Date checked:
github.com
Commit graded: b1e3789137b2fae09f7fd4b10f15875eb329a191
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.