I’m trying to setup the AI spam detector for my own Discourse instance, but have several questions: The system prompt of spam detector persona can’t be edited. I can create a new persona but there is no field to make Discourse know that it is going to be used as a spam detector? I want to use Qwen…

I just did a quick setup and it works fine selecting the custom persona for spam. [Screenshot 2025-11-19 at 1.54.11 PM] [Screenshot 2025-11-19 at 1.51.51 PM] Let us know again if you are not able to do so via /discourse-ai/ai-spam

Hi there, to answer your question: [Bild] lilydjwg: What does the tokenizer do here? From the docs: [Bild] Discourse AI - Large Language Model (LLM) settings page What is tokenizer? The tokenizer translates strings into tokens, which is what a model uses to understand the input.

Thanks, but I know what a tokenizer is. What I don’t know is what Discourse uses it for, and what would happen if I picked the wrong tokenizer? I don’t need a tokenizer to call an LLM anyway.

[Bild] lilydjwg: The system prompt of spam detector persona can’t be edited. Can you try visiting this https://<your-site>/admin/plugins/discourse-ai/ai-spam - it should allow you to select your persona insert custom instructions and test against a post [Bild] lilydjwg: Does QwenTokeni…

[Bild] nat: insert custom instructions IIUC this instruction is concatenated to the system prompt instead of replacing it, making the prompt even longer and have mixed languages… [Bild] nat: Yup you can go ahead and do that, then run the “Test” But passing the test doesn’t mean there …

Thanks, so that “spam detector” label only affects the list filering of personas? I’ll setup a test environment and try it.

I checked the source code. If I didn’t make mistakes, the tokenizer is used for two things: count tokens for statistics and price estimation, and truncate posts to the set limit. So it shouldn’t affect me a lot if a wrong one is used.

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lilydjwg 19. November 2025 um 06:13 7

Danke, also wirkt sich dieses „Spam-Erkennung“-Label nur auf die Listenfilterung von Personas aus?
Ich werde eine Testumgebung einrichten und es ausprobieren.

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