This record as markdown: /tools/1595901624-crypto-mcp/des-decrypt.md
What des_decrypt does on Crypto_MCP
AI agents call des_decrypt to retrieve information from Crypto_MCP without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Why des_decrypt is rated Low
Decryption is a read operation that transforms ciphertext into plaintext. It does not create, modify, or delete data—it only reveals already-encrypted information. While the operation itself is cryptographic, the functional impact is equivalent to a retrieval/read operation. No destructive, financial, or code execution risk is present.
From the tool's definition Tool performs decryption ('decrypt text with des') which retrieves plaintext from ciphertext with no modification to stored data and no side effects.
Attacks that exploit this kind of access
The rule that runs des_decrypt safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Crypto_MCP, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For des_decrypt, this is the rule to start with:
des_decrypt is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Crypto_MCP, apply this rule, and every des_decrypt call is checked against it from then on.
Questions about des_decrypt
decrypt text with des. It is categorised as a Read tool in the Crypto_MCP MCP Server, which means it retrieves data without modifying state.
Register the Crypto_ MCP server in PolicyLayer and add a rule for des_decrypt: 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 Crypto_MCP. Nothing to install.
des_decrypt 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 des_decrypt 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 des_decrypt. 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.
des_decrypt is provided by the Crypto_ MCP server (1595901624/crypto-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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