# Docker MCP Gateway vs Sealgate | MCP Gateway Comparison

Docker MCP Gateway 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/docker-mcp-gateway-vs-sealgate

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# Docker MCP Gateway vs Sealgate

How Docker MCP Gateway and Sealgate compare for securing AI agents and their MCP tool calls, and where each one fits.

Last updated: September 2026

Docker MCP Gateway. Docker MCP Gateway is an MIT-licensed docker mcp CLI plugin that runs MCP servers as isolated local containers behind one gateway endpoint, with secret management, image signature verification and call interceptors.

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: Docker MCP Gateway is a developer tool that runs MCP servers in local containers with secret blocking; Sealgate is an enterprise runtime firewall that adds inline DLP, prompt-injection defense, shadow-MCP discovery and SSO, audit and SIEM governance.

## Docker MCP Gateway 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 | Docker MCP Gateway |
| --- | --- | --- |
| How local stdio MCP servers are handled. Whether your local MCP server stays on the device or is shipped elsewhere. | Tunnel in place (Yes) | Local containers (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 | ✓ Yes |
| 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 | ~ Partial |
| Shadow MCP discovery. Finds unauthorized MCP servers before they are used. | ✓ Yes | ✕ No |
| 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 | ✕ No |
| 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 | ~ 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 | ✕ No |
| 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

## Where Sealgate is different

- Sealgate scans tool traffic for data loss and prompt injection at runtime; Docker MCP Gateway blocks secret-like arguments and verifies image signatures, but does not run general DLP or a prompt-injection detector.
- Sealgate runs a device-level agent that discovers shadow MCP servers; Docker MCP Gateway manages only the containers it launches.
- Sealgate ships enterprise governance with SSO, audit and SIEM streaming; Docker MCP Gateway is a local developer tool without SSO or SIEM export.
- Sealgate governs the agent CLI as well as MCP; Docker MCP Gateway is consumed as an MCP endpoint.

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## Frequently asked questions

Do Docker MCP Gateway and Sealgate both run MCP servers locally? Yes. Docker MCP Gateway runs each MCP server as a container on your own Docker engine, and Sealgate tunnels local stdio servers so they keep running on the device, so both keep execution local rather than in a vendor cloud. That is a point of parity, so the deciding factors are elsewhere: inline DLP and prompt-injection defense, device-level shadow-MCP discovery, and enterprise SSO, audit and SIEM, which Sealgate adds and Docker MCP Gateway leaves to other tools.

Is Sealgate a good alternative to Docker MCP Gateway? Yes. Docker MCP Gateway is an MIT-licensed docker mcp CLI plugin that runs MCP servers as isolated local containers behind one gateway endpoint, with secret management, image signature verification and call interceptors. 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 Docker MCP Gateway does not? Sealgate scans tool traffic for data loss and prompt injection at runtime; Docker MCP Gateway blocks secret-like arguments and verifies image signatures, but does not run general DLP or a prompt-injection detector.

## Sources

Claims about Docker MCP Gateway 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.

- [Docker MCP Gateway (GitHub)](https://github.com/docker/mcp-gateway)
- [Docker MCP Catalog and Toolkit](https://docs.docker.com/ai/mcp-catalog-and-toolkit/)

## 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) [Unipile vs Sealgate](https://sealgate.ai/comparison/unipile-vs-sealgate) [Zapier MCP vs Sealgate](https://sealgate.ai/comparison/zapier-mcp-vs-sealgate) [Composio vs Sealgate](https://sealgate.ai/comparison/composio-vs-sealgate) [Kong AI Gateway vs Sealgate](https://sealgate.ai/comparison/kong-ai-gateway-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) [Arcade vs Sealgate](https://sealgate.ai/comparison/arcade-vs-sealgate) [Pipedream Connect MCP vs Sealgate](https://sealgate.ai/comparison/pipedream-vs-sealgate) [TrueFoundry vs Sealgate](https://sealgate.ai/comparison/truefoundry-vs-sealgate) [Traefik vs Sealgate](https://sealgate.ai/comparison/traefik-vs-sealgate) [StackOne vs Sealgate](https://sealgate.ai/comparison/stackone-vs-sealgate) [Workato Enterprise MCP vs Sealgate](https://sealgate.ai/comparison/workato-vs-sealgate) [Lunar MCPX vs Sealgate](https://sealgate.ai/comparison/lunar-mcpx-vs-sealgate) [IBM ContextForge vs Sealgate](https://sealgate.ai/comparison/ibm-contextforge-vs-sealgate) [Invariant MCP-Scan vs Sealgate](https://sealgate.ai/comparison/invariant-mcp-scan-vs-sealgate) [Bifrost vs Sealgate](https://sealgate.ai/comparison/bifrost-vs-sealgate) [Merge Agent Handler vs Sealgate](https://sealgate.ai/comparison/merge-agent-handler-vs-sealgate) [Microsoft MCP Gateway vs Sealgate](https://sealgate.ai/comparison/microsoft-mcp-gateway-vs-sealgate) [See all comparisons](https://sealgate.ai/comparison)

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