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Gateway to a running Unreal Editor: search, describe, execute, and configure capabilities.
About
Gateway to a running Unreal Editor: search, describe, execute, and configure capabilities.
Security Report
enginegate is a thin forwarding client that validates arguments and relays them to a local Unreal Editor MCP endpoint. It has no shell execution, no hardcoded secrets, and honest error handling, and its network and env var access match its purpose. The main concerns are that the capability token is optional, so calls to the editor are unauthenticated when it is unset, and that destructive-action consent is passed through without enforcement in the gateway itself. Supply chain analysis found 3 known vulnerabilities in dependencies (0 critical, 2 high severity). Package verification found 1 issue.
8 files analyzed · 8 issues found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
Permissions Required
This plugin requests these system permissions. Most are normal for its category.
What You'll Need
Set these up before or after installing:
Environment variable: UNREAL_MCP_URL
Environment variable: MCP_AUTOMATION_CAPABILITY_TOKEN
How to Install
Add this to your MCP configuration file:
{
"mcpServers": {
"io-github-cloudcorprecords-enginegate": {
"env": {
"UNREAL_MCP_URL": "your-unreal-mcp-url-here",
"MCP_AUTOMATION_CAPABILITY_TOKEN": "your-mcp-automation-capability-token-here"
},
"args": [
"-y",
"@reneturcios/enginegate"
],
"command": "npx"
}
}
}Documentation
View on GitHubFrom the project's GitHub README.
enginegate
enginegate gives an agent a single doorway into a running Unreal
Editor. Instead of a long list of editor tools, it exposes one
gateway tool, unreal, with four operations: search the editor's
capabilities in plain words, read one capability's contract before
using it, execute a capability, and configure which capability
groups are enabled.
Every call is forwarded to the editor's own local MCP endpoint, so enginegate only works while an editor with that endpoint is running. When it is not, calls come back as errors carrying the underlying connection problem — enginegate never invents an editor result.
Install
npx @reneturcios/enginegate call '{"operation":"search","query":"spawn actor"}'
Or run the container image:
docker run -i ghcr.io/cloudcorprecords/enginegate
The container defaults to the MCP server (see below). Pass CLI arguments to use it as a CLI instead.
Configuration
| Environment variable | Meaning |
|---|---|
UNREAL_MCP_URL | The editor's MCP endpoint. Default: http://127.0.0.1:3000/mcp |
MCP_AUTOMATION_CAPABILITY_TOKEN | When set, sent on every forwarded call as the X-MCP-Capability-Token header. |
CLI
# Search capabilities in plain words
enginegate call '{"operation":"search","query":"spawn actor"}'
# Read one internal tool's contract
enginegate call '{"operation":"describe","tool":"control_actor"}'
# Execute a capability by tool + action, or by capability id
enginegate call '{"operation":"execute","tool":"control_actor","action":"spawn","params":{"class":"PointLight"}}'
enginegate call '{"operation":"execute","capability":"control_actor.spawn","params":{"class":"PointLight"}}'
# Configure capability groups
enginegate call '{"operation":"configure","tool":"control_actor","params":{"enabled":true}}'
enginegate --version
Exit codes: 0 on success, 1 when a call fails validation or the
editor cannot be reached or returns an error, 2 for usage errors.
Argument requirements are checked before anything is forwarded, and the error names the missing field:
searchrequiresquerydescriberequirestoolexecuterequirestool+action, orcapabilityconfigurerequirestoolorparams
MCP server
One bin serves both faces. The mcp subcommand starts a stdio MCP
server:
npx -y @reneturcios/enginegate mcp
MCP client configuration:
{
"mcpServers": {
"enginegate": {
"command": "npx",
"args": ["-y", "@reneturcios/enginegate", "mcp"]
}
}
}
Tools
| Tool | Input | What it does |
|---|---|---|
unreal | operation (required; one of search, describe, execute, configure), plus per-operation fields: query, tool, action, capability, params, consent | Forwards the call to the running editor's gateway. describe returns a capability's contract — including a consent grant for destructive capabilities, which must be passed back as consent to execute them. |
Forwarded calls are JSON-RPC tools/call requests for the tool name
unreal. The editor endpoint may answer with a plain JSON body or a
server-sent-events stream; both are parsed, and the editor's own
result text (and error flag) is what the caller receives.
Development
npm install
npm run build # tsc -> dist/
npm test # node test runner over test/*.test.ts, no network
npm run dev # run the CLI from source via tsx
License
MIT — see LICENSE.
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