Developer builds custom AI agent to unify MongoDB, Gmail and WhatsApp without heavy frameworks

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A developer grew frustrated with the overwhelming AI tooling ecosystem and chose to build a lightweight personal agent called Hermes instead of relying on platforms like n8n or LangChain. The agent runs on an EC2 instance and connects MongoDB, Gmail, WhatsApp, and seismic alert feeds to generate cross-source reports using natural language prompts. Built with Baileys for WhatsApp, OAuth for Gmail, and the DeepSeek model via OpenRouter, Hermes was designed with strict tool contracts to minimize hallucinations and errors. Rather than granting broad data access, the developer limited the agent to a small, well-defined set of operations tailored to recurring needs. The key takeaway shared is to distinguish between deterministic workflows, where tools like n8n excel, and context-driven tasks that genuinely require an agent capable of reasoning.

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