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MCPSentinel

io.github.gentaArnezzi/mcpsentinelv0.2.2Security

Precision-first security scanning for Model Context Protocol servers.

In-path gate · all MCP tools

Using MCPSentinel in Claude, Cursor, Gemini CLI, Cline, or Zed?

MCP tool contracts can change remotely with no version bump. The mcpindex gate pins each contract and HOLDs the call when it drifts-before your agent acts. Zero credentials. This is not the package install for this server itself (use Install this server for that).

Install the mcpindex gate (one command)

Rewrites your MCP host config so each server launches behind the gate. Inspect first: curl -fsSL https://mcpindex.ai/install.sh | less

uv tool install mcpindex-gate && mcpindex-config-wire
Auditable install path →Watch it hold a drift →
Trust verdict · v1 advisory · method
NOT YET SCREENEDno verdict on file

Verdict not yet evaluated for this tool. The semantic screen takes adversarial cases first; coverage rolls out as the corpus expands (15/150 labels to graduation). The deterministic conformance probe is built but has not yet run on the public corpus, so a recorded verdict here is REVIEW or UNVERIFIED, never a clearing ALLOW. Until a verdict is recorded, an agent should treat this tool as not-yet-cleared and fall back to its own checks. Method: the eval, four-state verdict, honest limits.

Own this server? Screen its description →

That verdict was true at screening time (snapshot 2026-08-14).

Contracts can change after screening, with no version bump. The gate pins MCPSentinel’s tool contracts on first sight and holds any silent change before your agent acts - the check that keeps being true on Tuesday.

See your first HOLD in 2 minutes →

Related: how to trust an MCP server · screen before install · silent contract drift

Environment variables
MCPSENTINEL_ALLOWED_HOSTS
required

Comma-separated MCP server hostnames, optionally with an exact port, that the MCP-native scanner may connect to.

MCPSENTINEL_ALLOW_PRIVATE_HTTP_TARGETS

Set to true only to permit an explicitly allowlisted private or reserved HTTP address in a trusted local network.

MCPSENTINEL_MCP_APPROVE_BASELINE

Set to true only for a reviewed, one-time operator approval of the current MCP metadata baseline.

MCP quality score · maturity, not trust · methodology
freshness
25
completeness
15
installability
25
documentation
15
stability
5
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