CodeBot for Delphi: A Deep Dive into the New AI Assistant

CodeBot, a new AI assistant for Delphi developers, offers local/cloud hybrid code completion and refactoring, with a free tier of 500 requests per day. In testing, it generated unit tests in two seconds and provided 80% accurate refactor suggestions, though large multi-unit refactors can take up to a minute and occasionally pull wrong context with duplicate filenames.

CodeBot for Delphi: A Deep Dive into the New AI Assistant What Actually Runs Under the Hood CodeBot is a local/cloud hybrid agent. The IDE extension handles context extraction — open units, cursor /en/tags/cursor/ position, compile errors, and the current project's unit dependency graph. That context gets compressed into a prompt and sent to a fine-tuned model that has seen a large chunk of Delphi open-source code and Stack Overflow answers. The result comes back as either inline completions or full refactor proposals, not just "explain this code" chat. First Run, Step-by-Step 1. Install the IDE plugin from the RAD Studio repository manager. 2. Get an API key from the CodeBot dashboard there's a free tier with 500 requests/day . 3. Open the CodeBot panel, point it at your .dproj file, and let it index for a minute or two. 4. Hit Alt+C to generate at cursor, or Alt+R for refactor suggestions on a selection. The indexing stage is the important part. CodeBot builds a local semantic map of your units, so when you ask it to "add error handling to this data module," it already knows which exception classes your project standardizes on. A Real-World Prompt Workflow I spent an afternoon migrating a legacy forms app to a cleaner MVVM structure. The practical tutorial that worked best was giving CodeBot a single unit at a time and asking for concrete change sets, like this: Refactor TCustomerForm in CustomerForm.pas to separate the business logic into a TCustomerViewModel class. Keep the VCL form as a thin view, preserve all existing event handlers' behavior, and use the currently injected TCustomerService from unit CustomerService.pas. Respond with the full new unit code plus a diff outline. The output wasn't perfect — the generated view-model had a duplicate property definition and one over-eager Try block. But the diff outline made it easy to spot the mistakes. CodeBot also generated the unit tests in two seconds flat, something I usually skip because it takes too long by hand. Honest Impressions After Real Use Completion quality: noticeably better than generic copilots on VCL and FMX code. It knows TStringList ownership semantics and won't suggest leaks. Refactoring: the strongest feature. It respects the existing code style and unit boundaries. Test generation: baseline DUnitX tests are solid; edge-case coverage is still on you. Slowpoints: large multi-unit refactors can take up to a minute, and it occasionally pulls the wrong unit context if a project has duplicate filenames. Deployment: if you're behind a corporate firewall, you'll need the on-prem option — setup is straightforward but requires a separate server. The real value isn't autocomplete. It's the ability to say "turn this 400-line unit into a maintainable pattern" and get a starting point that's 80% right. For a niche ecosystem like Delphi, that's a rare and welcome thing. If you've been wondering whether AI can handle Object Pascal at all, CodeBot is the first answer that feels like it actually respects the language's constraints. Next PISIGuard: Keep Your Private Data Out of AI Chat Logs → /en/news/4833/