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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NateDhaliwal (Nate Dhaliwal) 19. November 2025 um 03:59 2

Hallo, um Ihre Frage zu beantworten:

Aus der Dokumentation:

Thema		Antworten	Aufrufe
AI powered Spam detection Announcements ai , spam	11	1374	11. Januar 2025
Random discussion about Discourse LLM setup Product Support	21	292	20. August 2026
Introducing Discourse AI Blog	26	4512	4. Mai 2023
What's the cheapest/best AI to use for AI Spam? Product Support ai , spam	6	569	18. März 2025
Discourse AI spam detection replaces Akismet plugin Announcements akismet , ai , spam	13	1512	4. November 2025

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