Base64 decode text using UTF-8.
AI agents call base64_decode to retrieve information from MCP Server Fly without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Base64 decoding is a data reading and transformation operation. It takes encoded input and returns plaintext output without modifying any system state, creating/deleting resources, or executing arbitrary code. While the decoded output could theoretically contain sensitive information, the tool itself performs only harmless cryptographic decoding.
From the tool's definition Tool performs base64 decoding, a reversible text transformation with no side effects. Description explicitly states it 'decode[s]' data using UTF-8, indicating a retrieval/transformation operation only.
Attacks that exploit this kind of access
Base64 decode text using UTF-8. It is categorised as a Read tool in the MCP Server Fly MCP Server, which means it retrieves data without modifying state.
Register the MCP Server Fly MCP server in PolicyLayer and add a rule for base64_decode: 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 MCP Server Fly. Nothing to install.
base64_decode 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 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. 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 is provided by the MCP Server Fly MCP server (kushalkachari993-dev/mcp-server-fly). 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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