sc_diff

Get the diff for a modified file in source control.

SERVERUnreal SOURCE@jjpxdev/unreal-mcp

Low RISK CLASS

Category Read

Parameters 11 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/jjpxdev-unreal-mcp/sc-diff.md

WHAT IT DOES

What sc_diff does on Unreal

AI agents call sc_diff to retrieve information from Unreal without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

Parameter	Type	Required	Description
`path`	string	Yes	File path to diff

Parameters from the server's own tool schema.

RISK

Why sc_diff is rated Low

This tool retrieves and displays differences between versions of a file in source control. It is a query operation with no side effects—it does not commit, revert, delete, or modify any files or version control state. The blast radius of misuse is minimal, as viewing diffs cannot corrupt data or cause unintended changes. This is a classic read operation.

From the tool's definition Tool name 'sc_diff' and description 'Get the diff for a modified file in source control' indicate retrieval of version control differences.

Risk signalsAccepts file system path (path)

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs sc_diff 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_diff, this is the rule to start with:

sc_diff Allowed

sc_diff is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "sc_diff": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Unreal, apply this rule, and every sc_diff call is checked against it from then on.

FAQ

Questions about sc_diff

What does the sc_diff tool do? +

Get the diff for a modified file in source control. It is categorised as a Read tool in the Unreal MCP Server, which means it retrieves data without modifying state.

What parameters does sc_diff accept? +

sc_diff accepts 1 parameter: path. Required: path. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on sc_diff? +

Register the Unreal MCP server in PolicyLayer and add a rule for sc_diff: 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.

What risk level is sc_diff? +

sc_diff is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit sc_diff? +

Yes. Add a rate_limit block to the sc_diff 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.

How do I block sc_diff completely? +

Set action: deny in the PolicyLayer policy for sc_diff. 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.

What MCP server provides sc_diff? +

sc_diff 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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