# Lasso Security MCP Gateway vs SealGate: Compared

Lasso's open-source MCP Gateway blocks prompt injection and masks PII. Where SealGate differs: device-level shadow MCP discovery, local stdio and the agent CLI.

Source: https://sealgate.ai/comparison/lasso-security-vs-sealgate

---

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MCP security gateway

# Lasso Security vs SealGate

How Lasso Security and SealGate compare for securing AI agents and their MCP tool calls, and where each one fits.

Last updated: September 2026

Lasso Security. Lasso Security's MCP Gateway is a security-first, open-source proxy: runtime behavioral analysis, prompt-injection blocking, PII masking and tool reputation scoring.

SealGate. A runtime agentic data firewall that blocks dangerous tool calls before they execute, scans tool traffic for data loss and prompt injection, discovers shadow MCP servers on the device, and streams a provable audit trail to your SIEM.

Bottom line: Lasso and SealGate are both runtime-security gateways; SealGate adds a device-level agent, shadow-MCP discovery, and agent-CLI coverage beyond the MCP proxy.

## Lasso Security 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 | Lasso Security |
| --- | --- | --- |
| How local stdio MCP servers are handled. Whether your local MCP server stays on the device or is shipped elsewhere. | Tunnel in place (Yes) | Direct proxy (Partial) |
| Local stdio servers stay on-device. The server keeps running on the machine, with no host-and-lift and no HTTP re-expose. | ✓ Yes | ~ Partial |
| 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 | ✓ Yes |
| Prompt injection and tool-poisoning defense. Detects and stops injection, tool poisoning and rug-pull attacks. | ✓ Yes | ✓ Yes |
| Gateway holds the credential. The gateway issues the final call so the agent cannot bypass policy and retry. | ✓ Yes | ~ Partial |
| Shadow MCP discovery. Finds unauthorized MCP servers before they are used. | ✓ Yes | ~ Partial |
| Provable per-call audit. A receipt for every call: agent, tool, policy version, result. | ✓ Yes | ~ Partial |
| SIEM integration and export. Streams audit events to Splunk, Sentinel and other SIEMs. | ✓ Yes | – Not publicly verified |
| SSO, SCIM and RBAC. Enterprise identity, group sync and role-based access. | ✓ Yes | ~ Partial |
| Tool-level policy. Read and write tiers, per-tool rules and human-in-the-loop approvals. | ✓ Yes | ✓ Yes |
| 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 | ~ Partial |
| 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

## Where SealGate is different

- SealGate adds a device-level agent and shadow MCP discovery; Lasso is a network and proxy layer with no on-device discovery.
- SealGate governs the agent CLI as well as MCP; Lasso governs MCP traffic only.
- SealGate tunnels local stdio servers in place; Lasso proxies stdio locally but does not keep and govern it as an on-device tunnel.

## 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)

## Get AI agents signed off by security, faster

Adopt AI agents and connect them to real data without leaking it. Start free, or book a walkthrough.

[Start Free](https://dashboard.sealgate.ai/?utm_source=sealgate.ai&utm_campaign=seo-comparison&utm_content=lasso-security-vs-sealgate) [Book a Demo](https://sealgate.ai/contact)

## Frequently asked questions

For how gateways work in general and what to look for, see our [guide to choosing an MCP gateway](https://sealgate.ai/guides/mcp-gateway) .

What is the Lasso Security MCP Gateway? It is Lasso Security's open-source MCP proxy, published on GitHub. It adds runtime behavioral analysis, prompt-injection blocking, PII masking and tool reputation scoring to MCP traffic. Lasso and SealGate are both runtime-security gateways; the difference is that SealGate also runs on the device.

Is SealGate a good alternative to Lasso Security? Yes. Lasso Security's MCP Gateway is a security-first, open-source proxy: runtime behavioral analysis, prompt-injection blocking, PII masking and tool reputation scoring. SealGate is a runtime agentic data firewall that blocks dangerous tool calls before they execute, scans tool traffic for data loss and prompt injection, discovers shadow MCP servers on the device, and streams a provable audit trail to your SIEM. If runtime data security is the priority, SealGate is a strong alternative.

What does SealGate do that Lasso Security does not? SealGate adds a device-level agent and shadow MCP discovery; Lasso is a network and proxy layer with no on-device discovery.

## Sources

Claims about Lasso Security 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.

- [Lasso Security MCP Gateway (GitHub)](https://github.com/lasso-security/mcp-gateway)

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