← Index

MCP Sidecar

io.github.lsequeiraa/mcp-sidecar·v0.3.2·Other

Cross-platform MCP server for managing long-lived background processes from any MCP client

In-path gate · all MCP tools

Using MCP Sidecar 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
SIDECAR_MAX_PROCESSES

Maximum number of concurrent managed processes (default: 10)

SIDECAR_BUFFER_SIZE

Output buffer size per stream in bytes (default: 1048576)

SIDECAR_KILL_TIMEOUT

Milliseconds to wait between graceful and forced termination (default: 5000)

SIDECAR_CLEANUP_AFTER

Seconds before exited processes are auto-removed. 0 disables cleanup (default: 1800)

SIDECAR_MAX_OUTPUT_SIZE

Global cap on bytes returned by the output tool. 0 means unlimited (default: 0)

SIDECAR_ALLOWED_EXECUTABLES

Comma-separated allowlist of executable names. When set, enables security mode with direct exec (no shell). Unset means security disabled.

SIDECAR_BLOCKED_PATTERNS

Comma-separated regex patterns to reject in commands. Only applies when security is enabled.

SIDECAR_AUDIT_LOG

Audit log destination. 'true' writes to cwd, 'temp' writes to OS temp dir, or a directory path. Unset disables audit logging.

MCP quality score · maturity, not trust · methodology
freshness
24
completeness
15
installability
25
documentation
15
stability
5
Alternatives in Other
hood. — .hood name service
ag.hood/name-service

Resolve .hood names on Robinhood Chain — forward/reverse, text records, availability & pricing.

agency.lona/trading
agency.lona/trading

AI-powered trading strategy development: backtesting, market data, and portfolio analysis

ABMeter
ai.abmeter/abmeter

Feature flagging and A/B testing platform with AI-first experimentation workflows.