Summary
Dicklesworthstone/ultimate_mcp_client v2026-03-22 was classified as CRITICAL RISK with a risk score of 281. Sigil detected 23 findings across 48 files, covering phases including provenance, install hooks, network exfiltration, obfuscation, code patterns. Review the findings below before installing this package.
Package description: Async Python client for the Model Context Protocol with interactive CLI and reactive Web UI, connecting AI models to MCP servers via stdio and SSE
v2026-03-22
23 March 2026, 11:53 UTC
by Sigil Bot
Risk Score
281
Findings
23
Files Scanned
48
Provenance
Findings by Phase
Phase Ordering
Phases are ordered by criticality, with the most dangerous at the top. Click any phase header to expand or collapse its findings. Critical phases are expanded by default.
install-makefile-curl
HIGHMakefile/script pipes remote content to shell
repo/README.md:147
# macOS / Linux
curl -LsSf https://astral.sh/uv/install.sh | sh
# WindowsWhy was this flagged?
A script or Makefile pipes content from a remote URL directly into a shell (curl | sh or wget | bash). This is inherently dangerous because the remote content can change at any time, and the command runs with the current user's permissions. Rated HIGH because it requires manual execution (unlike install hooks) but still executes arbitrary remote code.
install-pip-setup-exec
CRITICALsetup.py executes code at install time
repo/mcp_client.py:4953
# Since __init__ can't be async, we need to use a workaround
# We'll load it properly later in setup()
log.info(f"Found conversation graph file at {self.conversation_graph_file}, will load it during setup")Why was this flagged?
This setup.py calls subprocess, os.system, exec, or eval during package installation. Legitimate packages rarely need to execute arbitrary commands at install time. This pattern is commonly used by malicious packages to download and run payloads, exfiltrate environment variables, or establish persistence. Rated CRITICAL because it runs with the installer's full permissions.
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