MCP is an integration boundary, not a plugin format
By SynapseTel Cloud Engineering · Published August 6, 2026 · 3 min read
APIs and MCP can connect tools and data. MCP does not automatically make a workflow secure: authentication, server-side authorization, data handling and audit controls still need implementation and testing. Treat retrieved text and tool output as untrusted input.
Integration is not authorization
APIs and MCP can connect tools and data. MCP does not automatically make a workflow secure: authentication, server-side authorization, data handling and audit controls still need implementation and testing. Treat retrieved text and tool output as untrusted input.
Host, client and server
An MCP host runs the AI application; its clients connect to MCP servers that expose capabilities such as tools, resources and prompts. Choose API or MCP integration according to the systems involved, not as a requirement for every workflow.
Enforce each action at the service boundary
Scope credentials to the required resources and operations. Validate identity, authorization and inputs on the server for every action. A tool description or a user-interface confirmation cannot replace these controls.
Test denial and failure paths
Include unauthorized access, malicious retrieved text, expired credentials, repeated requests and downstream failure in evaluation. Record approval, execution and outcome separately. An uncertain result should trigger investigation rather than an unbounded retry.