# Lunar MCPX Review 2026: Features, Strengths and Gaps | SealGate

An honest Lunar MCPX review: what it is, where it is strong, and where it falls short for runtime agent data security, with a source-checked feature comparison against SealGate.

Source: https://sealgate.ai/comparison/lunar-mcpx-review

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Open-source MCP gateway

# Lunar MCPX review

What Lunar MCPX is, where it is strong, and where it falls short for securing AI agents and their tool calls. Every claim is drawn from Lunar MCPX's own public material, listed in Sources.

Last updated: September 2026

## What Lunar MCPX is

Lunar MCPX is an MIT-licensed, zero-code MCP aggregator that consolidates multiple MCP servers behind one endpoint with a declarative access-control list for per-agent tool permissions and parameter hardening; a closed enterprise edition adds DLP, SSO, audit and SIEM.

## Where Lunar MCPX is strong

- Runtime enforcement. Blocks a dangerous tool call before it executes, not just after the fact.
- Gateway holds the credential. The gateway issues the final call so the agent cannot bypass policy and retry.
- Provable per-call audit. A receipt for every call: agent, tool, policy version, result.
- SIEM integration and export. Streams audit events to Splunk, Sentinel and other SIEMs.
- SSO, SCIM and RBAC. Enterprise identity, group sync and role-based access.
- Self-host, on-prem or VPC. Run it in your own environment for data residency.
- Open source core. An open, inspectable core rather than a closed proxy.

## Where Lunar MCPX falls short

Measured against a runtime agent data firewall. These are the gaps that matter if your priority is stopping data loss at the point of the tool call.

- SealGate scans tool traffic for data loss in its core; in Lunar MCPX, DLP and PII redaction are enterprise-edition features, not part of the MIT core.
- SealGate runs a device-level agent and discovers shadow MCP servers; Lunar MCPX is a central aggregator with no on-device discovery.
- SealGate keeps local stdio servers on the device through a tunnel; Lunar MCPX aggregates and re-exposes servers from the gateway deployment.
- SealGate governs the agent CLI as well as MCP; Lunar MCPX governs the MCP tool layer.

## Lunar MCPX vs SealGate, feature by feature

SealGate leads with the rows at the top, its clearest points of difference, then the parity rows every enterprise gateway is expected to cover.

| Capability | SealGate | Lunar MCPX |
| --- | --- | --- |
| How local stdio MCP servers are handled. Whether your local MCP server stays on the device or is shipped elsewhere. | Tunnel in place (Yes) | Gateway aggregation (No) |
| Local stdio servers stay on-device. The server keeps running on the machine, with no host-and-lift and no HTTP re-expose. | ✓ Yes | ✕ No |
| Device-level management. An endpoint agent that discovers and governs MCP activity on the device itself. | ✓ Yes | ✕ No |
| Interface coverage. Whether the gateway governs only the MCP protocol, or the agent CLI and LLM API too. | MCP + CLI (Yes) | MCP only (No) |
| Runtime enforcement. Blocks a dangerous tool call before it executes, not just after the fact. | ✓ Yes | ✓ Yes |
| DLP, PII and secrets scanning. Inspects tool inputs and outputs for sensitive data at runtime. | ✓ Yes | ~ Partial |
| Prompt injection and tool-poisoning defense. Detects and stops injection, tool poisoning and rug-pull attacks. | ✓ Yes | ~ Partial |
| Gateway holds the credential. The gateway issues the final call so the agent cannot bypass policy and retry. | ✓ Yes | ✓ Yes |
| Shadow MCP discovery. Finds unauthorized MCP servers before they are used. | ✓ Yes | – Not publicly verified |
| Provable per-call audit. A receipt for every call: agent, tool, policy version, result. | ✓ Yes | ✓ Yes |
| SIEM integration and export. Streams audit events to Splunk, Sentinel and other SIEMs. | ✓ Yes | ✓ Yes |
| SSO, SCIM and RBAC. Enterprise identity, group sync and role-based access. | ✓ Yes | ✓ Yes |
| Tool-level policy. Read and write tiers, per-tool rules and human-in-the-loop approvals. | ✓ Yes | ~ Partial |
| Self-host, on-prem or VPC. Run it in your own environment for data residency. | ✓ Yes | ✓ Yes |
| Compliance mapping. Evidence mapped to SOC 2, NIST AI RMF and the EU AI Act. | ~ Partial | ~ Partial |
| Low latency overhead. Minimal added latency on the tool-call path. | ✓ Yes | – Not publicly verified |
| Open source core. An open, inspectable core rather than a closed proxy. | ✕ No | ✓ Yes |

›

✓ Strong or native ~ Partial or via a partner ✕ Not offered – Not publicly verified

Bottom line: Lunar MCPX is an open-source MCP aggregator whose DLP, audit and SIEM live in a closed enterprise edition; SealGate ships runtime DLP and injection defense in the core, plus a device-level agent, shadow-MCP discovery and agent-CLI coverage.

## How SealGate delivers this

The capabilities above are covered in depth on the product, security and deployment pages.

[How the SealGate gateway works](https://sealgate.ai/product) [Runtime DLP and prompt-injection defense](https://sealgate.ai/security) [Self-hosting and data residency](https://sealgate.ai/self-hosting)

## Evaluating Lunar MCPX for agent security?

See how SealGate blocks dangerous tool calls, scans for data loss, and keeps local servers on the device. Start free, or book a walkthrough.

[Start Free](https://dashboard.sealgate.ai) [Book a Demo](https://sealgate.ai/contact)

## Frequently asked questions

What is Lunar MCPX? Lunar MCPX is an MIT-licensed, zero-code MCP aggregator that consolidates multiple MCP servers behind one endpoint with a declarative access-control list for per-agent tool permissions and parameter hardening; a closed enterprise edition adds DLP, SSO, audit and SIEM.

What are the main limitations of Lunar MCPX? The clearest gap for teams focused on runtime data security: SealGate scans tool traffic for data loss in its core; in Lunar MCPX, DLP and PII redaction are enterprise-edition features, not part of the MIT core. Weigh this against your own priorities before deciding.

Is Lunar MCPX worth it? It depends on the axis you care about. Lunar MCPX is an open-source MCP aggregator whose DLP, audit and SIEM live in a closed enterprise edition; SealGate ships runtime DLP and injection defense in the core, plus a device-level agent, shadow-MCP discovery and agent-CLI coverage. Compare the two on the capabilities that matter to you.

## Sources

Claims about Lunar MCPX are drawn from its own public documentation, last reviewed September 2026. If something is out of date, tell us at [hello@sealgate.ai](mailto:hello@sealgate.ai) and we will correct it.

- [Lunar MCPX](https://www.lunar.dev/product/mcp)
- [Lunar (GitHub)](https://github.com/TheLunarCompany/lunar)
- [Lunar MCPX access control docs](https://docs.lunar.dev/mcpx/access_control_list/)

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