Tutorial Shows How to Build a Free, Fully Local RAG Pipeline with Python and Ollama

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A DEV Community tutorial explains how to query private documents with a large language model without sending data to third-party APIs. The guide uses Python, the Ollama local model runtime, and ChromaDB as a vector database, with Mistral as the model. It walks through embedding a small sample knowledge base, retrieving the most relevant chunks for a user question, and generating an answer grounded in that context. The author argues the setup offers zero API costs and full data privacy.

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Man-in-the-Middle Attacks: How Public Wi-Fi Can Expose Your Data

A Man-in-the-Middle attack lets a malicious party secretly sit between a user's device and the server they are contacting, reading or altering the data passing through. Such attacks are especially common on public Wi-Fi at airports, cafes, and hotels, where attackers may set up fake hotspots with convincing names. Techniques like ARP spoofing can redirect a device's traffic through the attacker's machine, exposing unencrypted passwords and enabling fake login pages. Because traffic is not blocked, victims often continue browsing without noticing their data is being captured. Using HTTPS, which encrypts data between the browser and server, is a key defense against interception.

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ProgrammingDEV Community ·

Three Claude Code permission presets and the gap none of them closes

The article presents three permission presets for Claude Code's settings.json, ranging from strict to fully autonomous, to reduce repeated approval prompts. Rules are evaluated with deny taking precedence over ask, and ask over allow, with unlisted commands falling back to the defaultMode. The author notes that the autonomous preset's Bash(git:*) rule also permits destructive commands like git push --force and git reset --hard, since permission rules match only by command prefix. A second gap is that file-read restrictions apply to Claude's Read tool but not to shell commands such as cat .env, which requires PreToolUse hooks to inspect and block. The author links free open-source hooks for blocking destructive commands and secret writes, and promotes a paid Spanish-language kit bundling the presets, hooks, skills, and templates.

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ProgrammingDEV Community ·

Open-source library builds Angular Material tables with filters, pagination and CRUD dialog from one config

The author, who created the open-source library easy-mat-ui-ng20, describes a way to avoid rewiring tables, paginators, sorting and filters in every Angular admin project. The library generates an Angular Material table with sorting, pagination, per-column text or multi-select filters, and a toolbar with search, add and clear buttons from a single configuration object. Row actions for view, edit and delete, plus a create/edit/view dialog built from column definitions, are also covered by that same configuration. It targets Angular 20 with Angular Material, ngx-translate, Bootstrap 5 and RxJS 7 as peer dependencies, and the article includes a live demo and install instructions. The author notes that the table does not mutate data but reports changes through outputs, letting the host application manage its own state.

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ProgrammingDEV Community ·

Why agent identity needs a full lifecycle model, not just governance

The article argues that the market for governing AI agent work is real but depends on a more basic problem: defining agent identity across its lifecycle. Current governance systems assume a principal already exists, while autonomous agents raise earlier questions about how identity begins, how ownership attaches, and how delegated authority spreads. The author highlights an intermediate 'orphan' state, where an agent acts before a human claims it, as a key reason identity systems must go beyond governance. The piece also presents lineage tracking of which agent spawned which as part of identity itself, and separates identity lifecycle, governance, and runtime enforcement into distinct but interacting layers.

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