This record as markdown: /tools/jjpxdev-unreal-mcp/sc-checkout.md
What sc_checkout does on Unreal
AI agents use sc_checkout to create or update resources in Unreal, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Unreal environment.
| Parameter | Type | Required | Description |
|---|---|---|---|
paths | array | Yes | File paths to check out |
Parameters from the server's own tool schema.
Why sc_checkout is rated Medium
Checking out files in source control modifies the state of the repository by locking or reserving files for editing. This is a reversible operation (files can be checked back in or reverted), so it falls under Write rather than Destructive.
From the tool's definition Tool name 'sc_checkout' and description 'Check out file(s) from source control' indicate modification of source control state. Checkout is a write operation that changes file locks/reservations in version control systems.
Attacks that exploit this kind of access
The rule that runs sc_checkout safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Unreal, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For sc_checkout, this is the rule to start with:
sc_checkout stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Unreal, apply this rule, and every sc_checkout call is checked against it from then on.
Questions about sc_checkout
Check out file(s) from source control. It is categorised as a Write tool in the Unreal MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
sc_checkout accepts 1 parameter: paths. Required: paths. The full parameter table on this page comes from the server's own tool schema.
Register the Unreal MCP server in PolicyLayer and add a rule for sc_checkout: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Unreal. Nothing to install.
sc_checkout is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the sc_checkout rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for sc_checkout. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
sc_checkout is provided by the Unreal MCP server (@jjpxdev/unreal-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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