暗号化ファイルを復号化します
AI agents call decrypt_file to retrieve information from Claude MCP Server Integration without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Decryption is fundamentally a read operation—it transforms ciphertext into readable plaintext without modifying or deleting the underlying file. However, severity is elevated to 'medium' rather than 'low' because unauthorized decryption can expose sensitive data if access controls are bypassed or keys are compromised.
From the tool's definition Tool name 'decrypt_file' and description indicating decryption of encrypted files (Japanese: '暗号化ファイルを復号化します' = 'decrypt encrypted files'). The operation retrieves or exposes plaintext data from encrypted storage.
Attacks that exploit this kind of access
暗号化ファイルを復号化します. It is categorised as a Read tool in the Claude MCP Server Integration MCP Server, which means it retrieves data without modifying state.
Register the Claude MCP Server Integration MCP server in PolicyLayer and add a rule for decrypt_file: 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 Claude MCP Server Integration. Nothing to install.
decrypt_file 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 decrypt_file 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 decrypt_file. 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.
decrypt_file is provided by the Claude MCP Server Integration MCP server (mokemoke0821/claude-mcp-integration). 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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