Skills/PyPI/mcp-proxy

mcp-proxy@0.14.0

VERIFIED· not started

Publisher claims: "A MCP server which proxies requests to a remote MCP server over streamable HTTP or SSE." Observed in sandbox: no network, touches nothing outside the project, writes no memory.

Registry PyPI (MCP server)Publisher sparfenyuk · publishing for 685 daysInstalls 888KLast detonated 6d ago
$claude mcp add mcp-proxy -- uvx mcp-proxy
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Coverage

Not started: dependency install failed; the server itself was not observed.
Tested
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: Verified 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
API_ACCESS_TOKEN or --client-secretConfiguration, not credentials: SSE_URL
Where it talks to
no vendor host named in the codeAlso server.local — not the publisher's domain; check what for before connecting.
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, and read the third-party hosts first. The code names server.local as well as its own vendor. The guard injects API_ACCESS_TOKEN only into requests to the host you bind (and its subdomains) and refuses the rest.

$vet-skills run --net declared -- uvx mcp-proxy

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 (2 scenarios; not started: dependency install failed; the server itself was not observed) on 2026-11-08 and scored it 88/100 (Verified). In what ran, nothing we could detect went wrong: no undeclared network egress, no credential reads, no persistent instruction writes. What it does with a real credential was not observed; the static findings and the publisher carry the rest of the score. Summary: no network, touches nothing outside the project, writes no memory.

Behavior trace

Honeypot run · 0 s · 2 scenarios · 0 deviations
t+CategoryObserved action
0.0sprocessno install scripts in bundle
0.4sprocessdependency install exit 1 ·
0.4sclaimednot started: dependency install failed (exit 1); the server itself was not observed
0.4sprocessscript backend runs setup only
0.4sprocessno install scripts to re-run

Static findings

MEDIUM
URL with embedded credentialstests/test_httpx_client.py:461 · URL with embedded credentials — may be phishing or credential leaking"http://user-secret:[email protected]/sse?query-secret#fragment-secret",Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST07
MEDIUM
Python subprocess execution detectedtests/test_container_image.py:80 · Python subprocess execution detectedreturn subprocess.run(command, capture_output=True, text=True, timeout=60, check=False) # noqa: S603Fix: Build commands from fixed arguments, never from interpolated strings; prefer an API client over shelling out.
AST05
MEDIUM
URL with embedded credentialstests/test_httpx_client.py:469 · URL with embedded credentials — may be phishing or credential leaking"http://user-secret:[email protected]/mcp?query-secret#fragment-secret",Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST07
MEDIUM
MCP server using network transport (SSE/HTTP)tests/test_mcp_server.py:1143 · MCP server using network transport (SSE/HTTP) — data sent over networkasync def test_run_mcp_server_sse_url_logging(Fix: Namespace tool names and keep tool descriptions literal; no instructions to the agent inside them.
AST04
MEDIUM
MCP server using network transport (SSE/HTTP)src/mcp_proxy/__main__.py:254 · MCP server using network transport (SSE/HTTP) — data sent over networkmcp_server_group = parser.add_argument_group("SSE server options")Fix: Namespace tool names and keep tool descriptions literal; no instructions to the agent inside them.
AST04
MEDIUM
Python subprocess execution detectedtests/test_container_image.py:96 · Python subprocess execution detectedcleanup = subprocess.run( # noqa: S603Fix: Build commands from fixed arguments, never from interpolated strings; prefer an API client over shelling out.
AST05
MEDIUM
Python subprocess execution detectedtests/test_container_image.py:86 · Python subprocess execution detectedinspection = subprocess.run( # noqa: S603Fix: 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)tests/test_mcp_server.py:1147 · MCP server using network transport (SSE/HTTP) — data sent over network"""Test run_mcp_server logs correct SSE URLs."""Fix: Namespace tool names and keep tool descriptions literal; no instructions to the agent inside them.
AST04
LOW
Context shift attemptREADME.md:392 · Context shift attempt — trying to change operational mode · informational: not an instruction file--debug, --no-debug Enable debug mode with detailed logging output. Equivalent to --log-level DEBUG. If both --debug and --log-level are provided, --debug takes precedence.Fix: Remove the text that addresses the agent rather than the reader; describe behavior, do not instruct.
AST01

Cost to the agent

Instructions loaded
≈57 tok
1 file · 35 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 mcp-proxy@0.14.0 as of 6d ago. This is the package itself, not its dependencies.