Elenchus: The open-source Claude Tag

- **Elenchus** is an open-source browser extension that lets users inject custom system prompts (called "tags") into their Claude.ai conversations — effectively mirroring what "Claude Tags" (an Anthropic-released feature allowing pre-written instructions to be appended to chats) does, but for those who don't have access to it yet. - It allows users to add persistent instructions or personality tweaks to Claude, and also integrates with local context files (e.g., a personal knowledge base on your machine) so the AI can reference your own notes or documents. - Why it matters: instead of waiting for Anthropic to roll out its official tagging feature to all accounts, technically inclined users can achieve the same result today, on their own terms, with full control over the prompts and data.