Skills/PyPI/mcpo-simple-server

mcpo-simple-server@0.2.2

CAUTION· not started

Publisher claims: "Python-based LLM server that implements the Model Context Protocol (MCP)" Observed in sandbox: no network, touches nothing outside the project, writes no memory.

Registry PyPI (MCP server)Publisher artur-zdolinski-contact · publishing for 491 daysInstalls 15Last detonated 3d ago
What would fix thisWatchDispute verdict

Coverage

Not started: dependency install failed; the server itself was not observed.
Tested
install scripts, with decoy credentials in place · second launch with the clock 45 days ahead · the dependency install step · every file read, file written and host contacted by what ran
Not tested
server startup · the tool list · tool behavior

What this means for the label: Caution here covers what ran. The server's tools were not exercised with a real credential, so nothing about their behavior is asserted; the credential summary below says what to do with that.

Before you give it your token

It will ask for
ADMIN_PASSWORDAPI_KEY_ENCRYPTION_KEYAPI_KEY_PREFIXCORS_ALLOW_CREDENTIALSJWT_ACCESS_TOKEN_EXPIRE_MINUTESJWT_SECRET_KEYConfiguration, not credentials: ADMIN_BEARER_HACK, CONFIG_STORAGE_PATH, CONFIG_STORAGE_TYPE, CORS_ALLOW_HEADERS, CORS_ALLOW_METHODS, CORS_ALLOW_ORIGINS, JWT_ALGORITHM, JWT_AUDIENCE, JWT_ISSUER, MCPSERVER_CLEANUP_INTERVAL, MCPSERVER_CLEANUP_TIMEOUT, PYTHONPATH, SALT, TOOLS_BLACKLIST
Where it talks to
no vendor host named in the code
What the honeypot saw
no credential files read · no network
What we could not test
server startup · the tool list · tool behavior

Connect it with a scoped credential, under the guard. It asks for ADMIN_PASSWORD, API_KEY_ENCRYPTION_KEY, API_KEY_PREFIX, CORS_ALLOW_CREDENTIALS, JWT_ACCESS_TOKEN_EXPIRE_MINUTES, JWT_SECRET_KEY and talks to its vendor. Give the credential to the guard, not the server: the value never enters the server's environment and only travels to the host you bind. What the tools do with a real credential was not observed.

$vet-skills run --net declared -- uvx mcpo-simple-server

Never paste a credential into a chat, a ticket or a report, including ours. How the guard holds it.

Is [email protected] safe to install?

KillerSkills ran it in the KillerSkills honeypot sandbox (3 scenarios; not started: dependency install failed; the server itself was not observed) on 2026-11-11 and scored it 68/100 (Caution). It is not known to be malicious, but it has behaviour or code a security policy should decide on before install. Notable findings: Access to sensitive file paths; Prompting user to enter sensitive credentials; Access to sensitive file paths. Summary: no network, touches nothing outside the project, writes no memory.

Behavior trace

Honeypot run · 0 s · 3 scenarios · 0 deviations
t+CategoryObserved action
0.0sprocessexited 1: ModuleNotFoundError: No module named 'setuptools'
0.1sprocessdependency install exit 1 ·
0.1sclaimednot started: dependency install failed (exit 1); the server itself was not observed
0.2sprocessscript backend runs setup only
0.2sprocesssecond launch, clock +45 days, CI unset
0.2sprocessexited 1: ModuleNotFoundError: No module named 'setuptools'

Static findings

MEDIUM
npx invocation of non-well-known packagemcpo_simple_server/__main__.py:37 · npx invocation of non-well-known package — may execute untrusted codelogger.error("NPX is not installed. Please install NPX and try again.")Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
HIGH
Access to sensitive file pathspyproject.toml:36 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system filesmcpo_simple_server = ["data/**", ".env"]Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
MEDIUM
npx invocation of non-well-known packagemcpo_simple_server/__main__.py:38 · npx invocation of non-well-known package — may execute untrusted codelogger.error("NPX can be installed by running: apt-get -y install npm && npm install -g npx")Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
CRITICAL
Prompting user to enter sensitive credentialsmcpo_simple_server/routers/user/mcpo_user_tools.py:181 · Prompting user to enter sensitive credentials — social engineering"description": "Enter your API key with the format: Bearer YOUR_API_KEY"Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST03
MEDIUM
MCP server using network transport (SSE/HTTP)mcpo_simple_server/services/mcp_sse/setup.py:91 · MCP server using network transport (SSE/HTTP) — data sent over networklogger.info(f"MCPServer (id: {id(mcp_server_instance)}) finished for SSE session.")Fix: Namespace tool names and keep tool descriptions literal; no instructions to the agent inside them.
AST04
MEDIUM
Process kill commandmcpo_simple_server/cli/cmd_kill.sh:4 · Process kill command — agent can terminate processesps aux | grep "gunicorn" | grep "simpletool" | grep -v grep | awk '{print $2}' | xargs -r kill -9Fix: Build commands from fixed arguments; do not interpolate untrusted strings into a shell.
AST05
MEDIUM
Process kill commandmcpo_simple_server/run.sh:14 · Process kill command — agent can terminate processes# Parse --force option to kill port 8000 listenerFix: Build commands from fixed arguments; do not interpolate untrusted strings into a shell.
AST05
MEDIUM
npx invocation of non-well-known packagemcpo_simple_server/services/starter/libverifier.py:13 · npx invocation of non-well-known package — may execute untrusted codeNPX = "npx"Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
MCP server using network transport (SSE/HTTP)mcpo_simple_server/services/mcpserver/service.py:7 · MCP server using network transport (SSE/HTTP) — data sent over networkfrom mcpo_simple_server.services.mcpserver.tools import McpServerToolsServiceFix: Namespace tool names and keep tool descriptions literal; no instructions to the agent inside them.
AST04
HIGH
Access to sensitive file pathsmcpo_simple_server/main.py:42 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system files# Load environment variables from .env fileFix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
MEDIUM
Process kill commandmcpo_simple_server/cli/cmd_kill.sh:5 · Process kill command — agent can terminate processesps aux | grep "python3 -m server" | grep -v grep | awk '{print $2}' | xargs -r kill -9Fix: Build commands from fixed arguments; do not interpolate untrusted strings into a shell.
AST05
MEDIUM
MCP server using network transport (SSE/HTTP)mcpo_simple_server/services/mcpserver/tools.py:43 · MCP server using network transport (SSE/HTTP) — data sent over networkclass McpServerToolsService:Fix: Namespace tool names and keep tool descriptions literal; no instructions to the agent inside them.
AST04
MEDIUM
npx invocation of non-well-known packagemcpo_simple_server/services/starter/libverifier.py:89 · npx invocation of non-well-known package — may execute untrusted codemessage="NPX is installed"Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
Python subprocess execution detectedmcpo_simple_server/services/starter/libverifier.py:77 · Python subprocess execution detectedcmd_result = subprocess.run(['npx', '--version'], capture_output=True, text=True, check=False)Fix: Build commands from fixed arguments, never from interpolated strings; prefer an API client over shelling out.
AST05
MEDIUM
npx invocation of non-well-known packagemcpo_simple_server/__main__.py:41 · npx invocation of non-well-known package — may execute untrusted codelogger.info(f"NPX {check_results[LibType.NPX].version} is installed at {check_results[LibType.NPX].path}")Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
HIGH
Access to sensitive file pathsmcpo_simple_server/run.sh:40 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system filesecho "JWT_SECRET_KEY=$JWT_SECRET_KEY" >> "$mcpo_simple_server_path/.env"Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
HIGH
Access to sensitive file pathsmcpo_simple_server/run.sh:41 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system filesecho "API_KEY_ENCRYPTION_KEY=$API_KEY_ENCRYPTION_KEY" >> "$mcpo_simple_server_path/.env"Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
MEDIUM
MCP server using network transport (SSE/HTTP)mcpo_simple_server/services/mcpserver/service.py:60 · MCP server using network transport (SSE/HTTP) — data sent over networkself.tools = McpServerToolsService(self)Fix: Namespace tool names and keep tool descriptions literal; no instructions to the agent inside them.
AST04
LOW
HTML comment carrying imperative instructions to the agentmcpo_simple_server/assets/html/index.html:7 · HTML comment carrying imperative instructions to the agent · informational: not an instruction fileUsing Unicode symbols instead of external icon libraryFix: Keep SKILL.md to visible, descriptive text. Remove comments and encoded text that address the agent.
AST01
MEDIUM
Python subprocess execution detectedmcpo_simple_server/services/starter/libverifier.py:104 · Python subprocess execution detectedcmd_result = subprocess.run(['uvx', '--version'], capture_output=True, text=True, check=False)Fix: Build commands from fixed arguments, never from interpolated strings; prefer an API client over shelling out.
AST05
MEDIUM
npx invocation of non-well-known packagemcpo_simple_server/services/starter/libverifier.py:76 · npx invocation of non-well-known package — may execute untrusted code# Check NPX version using subprocessFix: Pin versions and sources; vendor anything fetched at install time.
AST06
HIGH
Access to sensitive file pathsmcpo_simple_server/run.sh:37 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system filesif [ ! -f "$mcpo_simple_server_path/.env" ]; thenFix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
HIGH
Access to sensitive file pathsmcpo_simple_server/services/auth/jwt.py:12 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system files# Load environment variables from .env fileFix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
MEDIUM
MCP server using network transport (SSE/HTTP)mcpo_simple_server/services/mcp_sse/setup.py:87 · MCP server using network transport (SSE/HTTP) — data sent over networklogger.error(f"Error during MCPServer run for SSE: {e}", exc_info=True)Fix: Namespace tool names and keep tool descriptions literal; no instructions to the agent inside them.
AST04
MEDIUM
npx invocation of non-well-known packagemcpo_simple_server/services/starter/libverifier.py:94 · npx invocation of non-well-known package — may execute untrusted codemessage="NPX is not installed or not in PATH"Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
Process kill commandmcpo_simple_server/run.sh:23 · Process kill command — agent can terminate processes# If --force is set, kill any process on port 8000Fix: Build commands from fixed arguments; do not interpolate untrusted strings into a shell.
AST05
MEDIUM
Process kill commandmcpo_simple_server/run.sh:31 · Process kill command — agent can terminate processeskill -9 $pidFix: Build commands from fixed arguments; do not interpolate untrusted strings into a shell.
AST05
HIGH
Access to sensitive file pathsmcpo_simple_server/logger.py:7 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system files# Load environment variables from .env fileFix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
HIGH
Access to sensitive file pathsmcpo_simple_server/run.sh:36 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system files# Check if .env exist - it not add mandatory env variablesFix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
HIGH
Destructive file system command detectedmcpo_simple_server/cli/cmd_kill.sh:8 · Destructive file system command detectedrm -f /var/run/simpletool/gunicorn.pidFix: Build commands from fixed arguments; do not interpolate untrusted strings into a shell.
AST05
HIGH
Access to sensitive file pathsmcpo_simple_server/config.py:77 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system fileslogger.error("Create {APP_PATH}/.env file with the following environment variables:")Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
MEDIUM
Process kill commandmcpo_simple_server/cli/cmd_kill.sh:11 · Process kill command — agent can terminate processeslsof -ti :8000 | xargs -r kill -9Fix: Build commands from fixed arguments; do not interpolate untrusted strings into a shell.
AST05
MEDIUM
Python subprocess execution detectedmcpo_simple_server/services/starter/libverifier.py:110 · Python subprocess execution detectedpath = subprocess.run(['which', 'uvx'], capture_output=True, text=True, check=False).stdout.strip()Fix: Build commands from fixed arguments, never from interpolated strings; prefer an API client over shelling out.
AST05
MEDIUM
Python subprocess execution detectedmcpo_simple_server/services/starter/libverifier.py:80 · Python subprocess execution detectedpath = subprocess.run(['which', 'npx'], capture_output=True, text=True, check=False).stdout.strip()Fix: Build commands from fixed arguments, never from interpolated strings; prefer an API client over shelling out.
AST05
MEDIUM
MCP server using network transport (SSE/HTTP)mcpo_simple_server/services/mcpserver/service.py:32 · MCP server using network transport (SSE/HTTP) — data sent over network- Tools Service (McpServerToolsService): Tool managementFix: Namespace tool names and keep tool descriptions literal; no instructions to the agent inside them.
AST04

Cost to the agent

Instructions loaded
≈57 tok
1 file · 81 in bundle
Tool list per prompt
≈0 tok
0 tools · 0 per tool
Handshake
no reply
launch to tools/list, stdio
Undocumented tools
0
description under 20 chars · avg 0

Tokens estimated at four characters each. The tool list is re-read by the agent on every turn, so it is the number to compare between servers that do the same job: ranked across the index.

Known vulnerabilities

No advisories in OSV for mcpo-simple-server@0.2.2 as of 3d ago. This is the package itself, not its dependencies.

What would make this Verified

12 points to 80 · weights: behavior 45%, static 25%, prompt 15%, publisher 15%
  1. Prompting user to enter sensitive credentials≈ +9 on the totalStop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
  2. Unclaimed publisher≈ +8 on the totalClaim artur-zdolinski-contact: a verified publisher gets +50 on publisher trust. It is free and usually instant with GitHub sign-in.
  3. Access to sensitive file paths≈ +4 on the totalStop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
  4. Destructive file system command detected≈ +4 on the totalBuild commands from fixed arguments; do not interpolate untrusted strings into a shell.
  5. npx invocation of non-well-known package≈ +2 on the totalPin versions and sources; vendor anything fetched at install time.
  6. MCP server using network transport (SSE/HTTP)≈ +2 on the totalNamespace tool names and keep tool descriptions literal; no instructions to the agent inside them.
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