# Invariant MCP-Scan vs Sealgate | MCP Gateway Comparison

Invariant MCP-Scan vs Sealgate compared across runtime enforcement, DLP, stdio handling, device-level management and audit. See where each MCP gateway fits and why teams pick Sealgate for runtime agent data security.

Source: https://sealgate.ai/comparison/invariant-mcp-scan-vs-sealgate

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# Invariant MCP-Scan vs Sealgate

How Invariant MCP-Scan and Sealgate compare for securing AI agents and their MCP tool calls, and where each one fits.

Last updated: September 2026

Invariant MCP-Scan. Invariant MCP-Scan (now part of Snyk) is an open-source scanner that detects tool poisoning, rug pulls and prompt injection in MCP servers. It is a scanner, not a runtime gateway.

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: Invariant MCP-Scan scans servers for tool poisoning and injection; Sealgate enforces policy on every call at runtime, blocking what a scan only flags.

## Invariant MCP-Scan 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 | Invariant MCP-Scan |
| --- | --- | --- |
| How local stdio MCP servers are handled. Whether your local MCP server stays on the device or is shipped elsewhere. | Tunnel in place (Yes) | – Not publicly verified |
| 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) | Scanner (No) |
| Runtime enforcement. Blocks a dangerous tool call before it executes, not just after the fact. | ✓ Yes | ✕ No |
| 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 | ✓ Yes |
| Gateway holds the credential. The gateway issues the final call so the agent cannot bypass policy and retry. | ✓ Yes | ✕ No |
| 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 | ✕ No |
| Tool-level policy. Read and write tiers, per-tool rules and human-in-the-loop approvals. | ✓ Yes | ✕ No |
| 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 | ✕ No |
| Low latency overhead. Minimal added latency on the tool-call path. | ~ Partial | – Not publicly verified |
| Open source core. An open, inspectable core rather than a closed proxy. | ✓ Yes | ✓ Yes |

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

## Where Sealgate is different

- Scanning finds a problem; Sealgate blocks it. Sealgate enforces policy on every call at runtime rather than scanning definitions ahead of time.
- Sealgate governs live tool traffic with DLP and audit; MCP-Scan analyzes servers rather than gating calls.

## Get AI agents signed off by security, faster

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

## Frequently asked questions

Is Sealgate a good alternative to Invariant MCP-Scan? Yes. Invariant MCP-Scan (now part of Snyk) is an open-source scanner that detects tool poisoning, rug pulls and prompt injection in MCP servers. It is a scanner, not a runtime gateway. 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 Invariant MCP-Scan does not? Scanning finds a problem; Sealgate blocks it. Sealgate enforces policy on every call at runtime rather than scanning definitions ahead of time.

## Sources

Claims about Invariant MCP-Scan 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.

- [Invariant MCP-Scan (GitHub)](https://github.com/invariantlabs-ai/mcp-scan)

## Compare Sealgate with other gateways

[MintMCP vs Sealgate](https://sealgate.ai/comparison/mintmcp-vs-sealgate) [Golf (GolfMCP) vs Sealgate](https://sealgate.ai/comparison/golf-vs-sealgate) [Runlayer vs Sealgate](https://sealgate.ai/comparison/runlayer-vs-sealgate) [Rippling vs Sealgate](https://sealgate.ai/comparison/rippling-vs-sealgate) [Portkey vs Sealgate](https://sealgate.ai/comparison/portkey-vs-sealgate) [Lasso Security vs Sealgate](https://sealgate.ai/comparison/lasso-security-vs-sealgate) [Obot vs Sealgate](https://sealgate.ai/comparison/obot-vs-sealgate) [MCP Manager vs Sealgate](https://sealgate.ai/comparison/mcp-manager-vs-sealgate) [PolicyLayer vs Sealgate](https://sealgate.ai/comparison/policylayer-vs-sealgate) [mcpgate vs Sealgate](https://sealgate.ai/comparison/mcpgate-vs-sealgate) [Peta vs Sealgate](https://sealgate.ai/comparison/peta-vs-sealgate) [Executor vs Sealgate](https://sealgate.ai/comparison/executor-vs-sealgate) [See all comparisons](https://sealgate.ai/comparison)

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