Get a sample of data from a file.
AI agents call get_data_sample to retrieve information from VisiData MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool retrieves and returns a subset of data from a file for inspection or analysis purposes. There are no side effects, no data modification, no execution of arbitrary code, and no financial implications. The blast radius of misuse is minimal—an agent could only access whatever data is already present in the file, which is a standard read operation.
From the tool's definition Tool name 'get_data_sample' and description 'Get a sample of data from a file' indicate retrieval of data without modification or deletion. This is a read-only query operation.
Attacks that exploit this kind of access
Get a sample of data from a file. It is categorised as a Read tool in the VisiData MCP Server MCP Server, which means it retrieves data without modifying state.
Register the VisiData MCP Server MCP server in PolicyLayer and add a rule for get_data_sample: 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 VisiData MCP Server. Nothing to install.
get_data_sample 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 get_data_sample 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 get_data_sample. 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.
get_data_sample is provided by the VisiData MCP Server MCP server (moeloubani/visidata-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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