nemu_dump_frame
Read and decode a CreateLitevm frame structure from guest memory. Parses the 256-byte frame fields: chain pointer, bytecode count, frame data, and sub-function flags. Essential for understanding the VM dispatch state at any point during execution.
This record as markdown: /tools/io-github-vmoranv-jshookmcp/nemu-dump-frame.md
What nemu_dump_frame does on Jshookmcp
AI agents call nemu_dump_frame to retrieve information from Jshookmcp without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Why nemu_dump_frame is rated Low
Tool reads and parses VM frame structures from memory without modifying or executing anything.
From the tool's definition Read and decode a CreateLitevm frame structure from guest memory. Parses
Attacks that exploit this kind of access
The rule that runs nemu_dump_frame safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Jshookmcp, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For nemu_dump_frame, this is the rule to start with:
nemu_dump_frame is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Jshookmcp, apply this rule, and every nemu_dump_frame call is checked against it from then on.
Questions about nemu_dump_frame
Read and decode a CreateLitevm frame structure from guest memory. Parses the 256-byte frame fields: chain pointer, bytecode count, frame data, and sub-function flags. Essential for understanding the VM dispatch state at any point during execution. It is categorised as a Read tool in the Jshookmcp MCP Server, which means it retrieves data without modifying state.
Register the Jshook MCP server in PolicyLayer and add a rule for nemu_dump_frame: 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 Jshookmcp. Nothing to install.
nemu_dump_frame 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 nemu_dump_frame 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 nemu_dump_frame. 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.
nemu_dump_frame is provided by the Jshook MCP server (@jshookmcp/jshook). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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