Pipelines without Spark

Why this mattered

A local framework should not need a distributed engine for every transformation.

This belongs in the development timeline because Agentic Assistants is not a single feature. It is a local-first assistant framework with a CLI, FastAPI and WebSocket server, MCP bridge, Next.js control panel, indexing, scoped retrieval, knowledge bases, pipelines, discovery, and training workflows. The project only became useful once its infrastructure decisions were written down well enough to be repeated.

Design decision

The pipeline layer uses graph concepts, pluggable runners, and clear artifacts so processing can scale from a laptop to heavier backends later.

The practical stack around this decision includes Python, Poetry, Click, FastAPI, WebSockets, MCP, LanceDB, Chroma, DuckDB, Polars, PyArrow, CrewAI, LangChain, LangGraph, Ollama, MLflow, OpenTelemetry, Next.js, Docusaurus. I try to keep the interfaces small: configuration describes intent, runtime code owns behavior, and operational notes explain what a future maintainer should check first.

What I would repeat

That keeps the first experience small while leaving room for orchestration.

The repeatable pattern is to make the boring path explicit. For this project that means clear repository boundaries, documented setup, predictable deployment commands, and enough observability to know whether the system is healthy or merely quiet.

Reader takeaway

If you are building something similar, start with the workflow you need to repeat every week. Then add only the platform pieces that make that workflow easier to recover, explain, and extend.