Download a workbook's .twb/.twbx content (base64 encoded).
AI agents call download_workbook to retrieve information from Tableau MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Downloading workbook content is a read operation—it retrieves and returns data in base64-encoded form without creating, modifying, or deleting anything. There are no side effects or irreversible changes. The blast radius is minimal: exposure of workbook definitions and metadata, which may contain sensitive information but does not alter system state.
From the tool's definition Tool name 'download_workbook' and description 'Download a workbook's .twb/.twbx content' indicate retrieval of existing data without modification or deletion. The action is a GET/fetch operation that exports workbook files.
Attacks that exploit this kind of access
Download a workbook's .twb/.twbx content (base64 encoded). It is categorised as a Read tool in the Tableau MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Tableau MCP Server MCP server in PolicyLayer and add a rule for download_workbook: 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 Tableau MCP Server. Nothing to install.
download_workbook 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 download_workbook 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 download_workbook. 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.
download_workbook is provided by the Tableau MCP Server MCP server (lokimcpuniverse/tableau-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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