syscall_filter
Filter captured syscall events by name, PID, or return value.
This record as markdown: /tools/io-github-vmoranv-jshookmcp/syscall-filter.md
What syscall_filter does on Jshookmcp
AI agents call syscall_filter 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 syscall_filter is rated Low
Tool filters existing syscall data without modifying, deleting, or executing operations.
From the tool's definition Filter captured syscall events by name, PID, or return value.
Attacks that exploit this kind of access
The rule that runs syscall_filter 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 syscall_filter, this is the rule to start with:
syscall_filter 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 syscall_filter call is checked against it from then on.
Questions about syscall_filter
Filter captured syscall events by name, PID, or return value. 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 syscall_filter: 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.
syscall_filter 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 syscall_filter 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 syscall_filter. 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.
syscall_filter 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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