resave_packages
Bulk resave all packages in the project (runs ResavePackages commandlet).
This record as markdown: /tools/jjpxdev-unreal-mcp/resave-packages.md
What resave_packages does on Unreal
AI agents use resave_packages 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 |
|---|---|---|---|
directory | string | — | Limit to a specific content directory |
Parameters from the server's own tool schema.
Why resave_packages is rated Medium
This tool bulk-writes/resaves all packages in the project, modifying files on disk. While it doesn't delete data, it overwrites package files in bulk across the entire project, which could have a large blast radius if misused (e.g., corrupting or overwriting packages with unintended changes).
From the tool's definition Bulk resave all packages in the project (runs ResavePackages commandlet)
Risk signalsAccepts file system path (directory)
Attacks that exploit this kind of access
The rule that runs resave_packages 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 resave_packages, this is the rule to start with:
resave_packages 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 resave_packages call is checked against it from then on.
Questions about resave_packages
Bulk resave all packages in the project (runs ResavePackages commandlet). 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.
resave_packages accepts 1 parameter: directory. 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 resave_packages: 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.
resave_packages 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 resave_packages 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 resave_packages. 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.
resave_packages 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.
More on Unreal, and thousands of servers like it.
This server
Across the catalogue