MCP, MCP server
Proton Bridge MCP
Read, organise and carefully-gated send for Proton Mail, without your mail leaving this machine.
Compatibility: Not stated.
Grade B
Minor issues only, no Medium or High. Worth a quick look at the findings below before installing.
Not a guarantee. A hygiene check of the source at the commit shown, not a security audit.
Rescanned at commit 3b05457354b7.
PERMISSION_DELETE_FILES SECRETS_PATH_DOTENV
Why this grade
- PERMISSION_DELETE_FILES Low
Contains a call that can delete files.
build-mcpb.py, line 97
subprocess.run([sys.executable, "-m", "pip", "install", "--quiet", - SECRETS_PATH_DOTENV Low
Mentions a .env file.
.env.example, line 1
# Proton Bridge MCP — copy to .env or set these in your MCP client's "env" block.
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
Concern
can delete files.
PERMISSION_DELETE_FILES
build-mcpb.py, line 97
subprocess.run([sys.executable, "-m", "pip", "install", "--quiet",
build-mcpb.py, line 108
shutil.rmtree(path, ignore_errors=True)
build-mcpb.py, line 110
shutil.rmtree(path, ignore_errors=True)
Show more
build-mcpb.py, line 171
subprocess.run(MCPB_CLI + ["pack", stage, out], check=True)
build-mcpb.py, line 173
shutil.rmtree(stage, ignore_errors=True)
server.py, line 172
out = subprocess.run(
server.py, line 2351
os.remove(path)
server.py, line 2476
p = subprocess.run(
setup.py, line 151
r = subprocess.run(
setup.py, line 183
r = subprocess.run(
Install and update
Pass
No install-time script found, and dependencies are pinned or absent.
Network
Pass
No network call found.
Secrets
Concern
reads a credential or environment file.
SECRETS_PATH_DOTENV
.env.example, line 1
# Proton Bridge MCP — copy to .env or set these in your MCP client's "env" block.
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 3b05457354b7. can delete files. reads a credential or environment file.
Date and source
Date checked:
github.com
Commit graded: 3b05457354b74ed5c99197bf1817fc84d65b85df
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