Verify sender + decrypt: authenticated hybrid envelope.
AI agents invoke pqc_hybrid_auth_open to trigger actions in Post-Quantum Cryptography MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.
This tool performs cryptographic operations (signature verification and decryption) on an authenticated hybrid envelope. It executes a multi-step cryptographic process rather than simply reading data or writing it. Misuse could expose plaintext of sensitive encrypted data or be used to validate forged envelopes if implemented incorrectly, giving it medium severity.
From the tool's definition Verify sender + decrypt: authenticated hybrid envelope
Attacks that exploit this kind of access
Verify sender + decrypt: authenticated hybrid envelope. It is categorised as a Execute tool in the Post-Quantum Cryptography MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Post-Quantum Cryptography MCP Server MCP server in PolicyLayer and add a rule for pqc_hybrid_auth_open: 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 Post-Quantum Cryptography MCP Server. Nothing to install.
pqc_hybrid_auth_open is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the pqc_hybrid_auth_open 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 pqc_hybrid_auth_open. 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.
pqc_hybrid_auth_open is provided by the Post-Quantum Cryptography MCP Server MCP server (scottdhughes/post-quantum-mcp). 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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