nemu_trace
Invoke an exported symbol while recording every instruction executed (pc, opcode, step), optionally snapshotting named registers per step. Bounded by maxSteps. Use to follow the control flow / algorithm of an obfuscated native function.
This record as markdown: /tools/io-github-vmoranv-jshookmcp/nemu-trace.md
What nemu_trace does on Jshookmcp
AI agents invoke nemu_trace to trigger actions in Jshookmcp. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call: builds kicked off, notifications sent, workflows started.
Why nemu_trace is rated High
Executes arbitrary native functions with tracing instrumentation; affects system state and external operations.
From the tool's definition invoke exported symbol, record instruction executed, control flow
Risk signalsBulk/mass operation — affects multiple targets
Attacks that exploit this kind of access
The rule that runs nemu_trace 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_trace, this is the rule to start with:
nemu_trace stays usable, but rate-capped: a runaway agent can't fire it dozens of times a minute. 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_trace call is checked against it from then on.
Questions about nemu_trace
Invoke an exported symbol while recording every instruction executed (pc, opcode, step), optionally snapshotting named registers per step. Bounded by maxSteps. Use to follow the control flow / algorithm of an obfuscated native function. It is categorised as a Execute tool in the Jshookmcp MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Jshook MCP server in PolicyLayer and add a rule for nemu_trace: 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_trace is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the nemu_trace 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_trace. 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_trace 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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