Searches within a log file for a specific pattern. Locates events within active log streams.
AI agents call grep_log_stream to retrieve information from Virtualbox MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and searches log data without side effects. It performs a passive search operation (similar to grep, a standard read-only utility) on existing log files or streams. No data is created, modified, deleted, or executed. The blast radius of misuse is minimal—an agent could only exfiltrate or inspect log contents, which is a Read category risk.
From the tool's definition Tool name 'grep_log_stream' and description 'Searches within a log file for a specific pattern. Locates events within active log streams' indicate read-only log querying with no modification or execution of commands.
Attacks that exploit this kind of access
Searches within a log file for a specific pattern. Locates events within active log streams. It is categorised as a Read tool in the Virtualbox MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Virtualbox MCP Server MCP server in PolicyLayer and add a rule for grep_log_stream: 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 Virtualbox MCP Server. Nothing to install.
grep_log_stream 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 grep_log_stream 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 grep_log_stream. 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.
grep_log_stream is provided by the Virtualbox MCP Server MCP server (usemanusai/virtualbox-mcp-server). 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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