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Exec Sandbox

io.github.inhuman/mcp-exec·v0.5.3·Cloud Storage

Single exec tool running caller Python in a network-isolated locked-down sandbox.

In-path gate · all MCP tools

Using Exec Sandbox 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

curl -fsSL https://mcpindex.ai/install.sh | sh
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 →

Environment variables
MCP_EXEC_TRANSPORT

MCP transport. Must be 'stdio' for direct docker/stdio use.

MCP_EXEC_DEFAULT_TIMEOUT_S

Default wall-clock timeout per exec, seconds.

MCP_EXEC_MAX_TIMEOUT_S

Maximum wall-clock timeout a caller may request, seconds.

MCP_EXEC_MAX_OUTPUT_BYTES

Cap on combined stdout/stderr before truncation.

MCP_EXEC_MAX_STDIN_BYTES

Cap on stdin passed to the sandboxed code.

MCP_EXEC_AUTH_TOKEN
secret

Optional X-MCP-AUTH token (http/sse transports only).

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