将Base64编码解码为文本
AI agents call base64_decode_text to retrieve information from Base64 MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Base64 decoding is a reversible, read-only operation that transforms data format without creating, modifying, deleting, or executing arbitrary code. It retrieves/transforms existing data without side effects, fitting the Read category. Severity is low because misuse of a decoder poses minimal risk—it cannot damage systems, delete data, or cause financial harm.
From the tool's definition Tool decodes Base64 to text; described as decode operation with no mention of side effects, data modification, or irreversible actions. The sibling tools (encode/decode for text and images) confirm this is a utility for encoding/decoding transformation.
Attacks that exploit this kind of access
将Base64编码解码为文本. It is categorised as a Read tool in the Base64 MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Base64 MCP Server MCP server in PolicyLayer and add a rule for base64_decode_text: 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 Base64 MCP Server. Nothing to install.
base64_decode_text 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 base64_decode_text 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 base64_decode_text. 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.
base64_decode_text is provided by the Base64 MCP Server MCP server (liuyazui/base64_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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