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Concept
MCP Security
MCP is where a model's intent becomes a real effect, which makes it the right place to put a decision. Every tool call can be evaluated before it runs — destination, payload, entitlement, and what the session has already done — and refused without the model needing to cooperate.
How do I secure an MCP server and the tool calls that run through it?
MCP is where a model's intent becomes a real effect, which makes it the right place to put a decision. Every tool call can be evaluated before it runs — destination, payload, entitlement, and what the session has already done — and refused without the model needing to cooperate.
4 patterns answer this
Control MCP egress
An agent calls a tool that reaches a network destination, uploads a file, or posts data to a third party.
8 executable policies
Gate agent memory and retrieval
An agent retrieves documents into context, or writes what it learned into durable memory.
6 executable policies
Prevent destructive production changes
A command, script, or agent drops a table, deletes a bucket, or tears down infrastructure.
3 executable policies
Third-party data sharing
A workflow posts customer or business data to a webhook, an external API, or a vendor integration.
6 executable policies
Where this fits
Decionis is the deterministic decision layer between intent and execution. This concept is one way in; the architecture behind it is the same in every case.