Claude Code, Skill
greybeard
Microsoft 365, Intune, and Entra admin skills with Greybeard MCP server wiring.
Compatibility: Not stated.
Grade D
Two or more Medium findings, or a High finding. Only try it in a sandbox.
Not a guarantee. A hygiene check of the source at the commit shown, not a security audit.
Rescanned at commit ead0664e3a26, unchanged since the check below.
INSTALL_REMOTE_SCRIPT OBFUSCATION_ENCODED_BLOB OBFUSCATION_MINIFIED_PAYLOAD
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).
docs/history/original-build-spec.md, line 280
- macOS/Linux: `curl -fsSL https://raw.githubusercontent.com/ugurkocde/greybeard/main/install.sh | sh` - OBFUSCATION_ENCODED_BLOB Medium
Contains a long base64 shaped string in a file that should be readable.
package-lock.json, line 1
{ - OBFUSCATION_MINIFIED_PAYLOAD Medium
Contains a very long line with almost no spaces in a script or style file.
package-lock.json, line 1
{
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
can delete files.
PERMISSION_DELETE_FILES
evaluations/automatic-0.1/transport/run.py, line 35
subprocess.run(['node',str(ROOT/'scripts/evaluate-memory-fixture.mjs'),str(app),'lesson'],check=True,capture_output=True)
evaluations/automatic-0.1/transport/run.py, line 36
subprocess.run(['node',str(ROOT/'scripts/evaluate-installed-host.mjs'),str(home),str(app),host,'automatic'],check=True,capture_output=True,cwd=ROOT)
evaluations/automatic-0.1/transport/run.py, line 43
shutil.rmtree(home/'.claude/skills',ignore_errors=True)
Show more
evaluations/automatic-0.1/transport/run.py, line 56
p=subprocess.run(cmd,cwd=work,env=env,capture_output=True,text=True,timeout=90);code=p.returncode;err=p.stderr;out=p.stdout
evaluations/automatic-0.1/transport/run.py, line 59
ledger=json.loads(subprocess.check_output(['node',str(ROOT/'scripts/evaluate-automatic-state.mjs'),str(app)],text=True))
evaluations/automatic-0.1/transport/run.py, line 63
preference=subprocess.run(preference_cmd,cwd=work,env=env,capture_output=True,text=True,timeout=90)
evaluations/automatic-0.1/transport/run.py, line 66
final_state=json.loads(subprocess.check_output(['node',str(ROOT/'scripts/evaluate-automatic-state.mjs'),str(app)],text=True))
evaluations/automatic-0.1/transport/run.py, line 73
l_state,'sourceHashes':hashes,'version':subprocess.check_output([binary,'--version'],text=True).strip()
scripts/evaluate-automatic-claude.py, line 12
subprocess.run(['node',str(ROOT/'scripts/evaluate-memory-fixture.mjs'),str(app),fixture],check=True,capture_output=True)
Install and update
Serious
install fetches a script from the network.
INSTALL_REMOTE_SCRIPT
docs/history/original-build-spec.md, line 280
- macOS/Linux: `curl -fsSL https://raw.githubusercontent.com/ugurkocde/greybeard/main/install.sh | sh`
docs/history/original-build-spec.md, line 286
$ curl -fsSL https://raw.githubusercontent.com/ugurkocde/greybeard/main/install.sh | sh
Network
Concern
can reach a host that is not written as a fixed address.
NETWORK_NO_FIXED_HOST
install.sh, line 53
curl --fail --show-error --location --proto '=https' --proto-redir '=https' \
cli/src/companionApi.test.ts, line 13
const response = await fetch(address.origin + path, { method: "POST",
cli/src/companionUi.ts, line 33
tate.memoryBinding;const response=await fetch(path,{method:'POST',headers:{'Content-Ty
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cli/src/mentor.test.ts, line 122
expect((await fetch(origin + "/state", { method: "POST" })).status).toBe(403);
cli/src/mentor.test.ts, line 124
expect((await fetch(origin + "/state", { method: "POST", headers, body: "{}" })).status).toBe(403);
cli/src/mentor.test.ts, line 126
expect((await fetch(origin + "/state", { method: "POST", headers, body: "{}" })).status).toBe(200);
cli/src/mentor.test.ts, line 130
expect((await fetch(origin + "/confirm", { method: "POST", headers, body: JSON.stringify({ id: node.id, content: "changed", revision: node.revision }) })).status).toBe(409);
cli/src/mentor.test.ts, line 131
expect((await fetch(origin + "/confirm", { method: "POST", headers, body: JSON.stringify({ id: node.id, content: node.content, revision: node.revision }) })).status).toBe(200);
Secrets
Concern
reads a credential or environment file.
SECRETS_PATH_DOTENV
cli/src/cli.test.ts, line 647
expect(config.mcpServers["greybeard-memory"].env).toMatchObject({ GREYBEARD_APP_DATA: paths.appData });
cli/src/mentor.test.ts, line 58
expect(config.mcpServers["greybeard-memory"].env).toMatchObject({ GREYBEARD_APP_DATA: f.appData, GREYBEARD_PROFILE_ID: "local" });
cli/src/setupRepair.test.ts, line 55
expect(updated.mcpServers["greybeard-memory"].env.GREYBEARD_MANAGED).toBe("0.1");
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cli/src/uninstall.ts, line 30
next = removeTomlTable(next, `mcp_servers.${server.name}.env`);
.gitignore, line 13
# Local credentials and memory must never be published.
.gitignore, line 14
.env
.gitignore, line 16
!.env.example
.gitignore, line 17
!.env.*.example
Agent instructions
Pass
No instruction to ignore earlier instructions or to hide a step.
Obfuscation
Concern
contains a minified payload. contains an encoded blob in a file that should be readable.
OBFUSCATION_ENCODED_BLOB OBFUSCATION_MINIFIED_PAYLOAD
package-lock.json, line 1
{
evaluations/automatic-0.1/contract-reviews.json, line 1
{
evaluations/automatic-0.1/transport/run.py, line 25
events=[('message_start',{'type':'message_start','message':{**message,'content':[],'stop_reason':None}}),('content_block_start',{'type':'content_block_start','index':0,'content_blo
Show more
evaluations/next-build/attempts/claude-before-custom-directory-fix/01/events.jsonl, line 6
{"type":"assistant","message":{"model":"claude-opus-5","id":"msg_011Cex8GYPE5ZiuY9KVtqnFv","type":"message","role":"assistant","content":[{"type":"thinking","thinking":"","signatur
evaluations/next-build/attempts/claude-before-custom-directory-fix/01/events.jsonl, line 17
{"type":"assistant","message":{"model":"claude-opus-5","id":"msg_011Cex8GuEMNYtjK7mv54Yc8","type":"message","role":"assistant","content":[{"type":"thinking","thinking":"","signatur
evaluations/next-build/attempts/claude-before-custom-directory-fix/01/events.jsonl, line 28
{"type":"assistant","message":{"model":"claude-opus-5","id":"msg_011Cex8HnJv9LQN2GcmXDeWh","type":"message","role":"assistant","content":[{"type":"thinking","thinking":"","signatur
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 ead0664e3a26. 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. contains a minified payload. contains an encoded blob in a file that should be readable.
Date and source
Date checked:
github.com
Commit graded: ead0664e3a266c2de158e2d1989188a8411eec93
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.