Building An MCP Client In Elixir

The article discusses the evolution from RAG (Retrieval-Augmented Generation) to agentic tool-calling patterns in AI systems, explaining how MCP (Model Context Protocol) standardized autonomous LLM decision-making across multiple tool calls rather than single-pass retrieval. The authors built a custom MCP client in Elixir instead of using existing libraries like Hermes MCP because their multi-tenant architecture required tight integration with existing permission systems and direct control over access management. The agentic approach enables LLMs to recursively examine results from one tool call, decide what information is still needed, and autonomously orchestrate subsequent tool calls—fundamentally more effective than manually scripted prompt chaining.

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