Get the implementation source code for a class, function, or struct.
AI agents call read_source to retrieve information from Unreal Source without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves source code content from the indexed database without executing it, modifying it, or triggering any side effects. It is a read-only query operation analogous to fetching documentation or viewing code files. The low severity reflects minimal risk if misused—an agent could retrieve source code but cannot compile, execute, or alter it through this tool alone.
From the tool's definition Tool name 'read_source' and description 'Get the implementation source code for a class, function, or struct' indicate data retrieval only. Verb 'Get' and action 'read' are passive retrieval operations with no modification or execution.
Attacks that exploit this kind of access
Get the implementation source code for a class, function, or struct. It is categorised as a Read tool in the Unreal Source MCP Server, which means it retrieves data without modifying state.
Register the Unreal Source MCP server in PolicyLayer and add a rule for read_source: 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 Source. Nothing to install.
read_source is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the read_source 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 read_source. 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.
read_source is provided by the Unreal Source MCP server (tumourlove/deprecated-unreal-source-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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