LLM Integration documentation is incorrect, what is the correct way to create a multi-line prompt in a Sieve script

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I’m trying to get something like the example on this page working: LLM Integration | Stalwart

However I am encountering an awkward problem, the first hurdle is that the syntax in the documentation is apparently invalid, and I can’t figure out what the proper syntax for multi-line string in Stalwart Sieve implementation is.

Specifically, I am getting an error like this if I straight up just copy the example from the documentation:

Failed to compile user Sieve script: Invalid character ‘'’ at line 4, column 14.

Anyone have any idea how this is supposed to be configured?

Variants I have tried

let "prompt" "You are an AI assistant tasked with classifying personal emails into specific folders.
Your job is to analyze the email's subject and body, then determine the most appropriate folder for filing.
Use only the folder names provided in your response.
If the category is not clear, respond with Inbox.";

Failed to compile user Sieve script: Invalid expression You are an AI assistant […], respond with Inbox.: Invalid variable or function name “You” at line 3, column 9.

let "prompt" "'''You are an AI assistant tasked with classifying personal emails into specific folders.
Your job is to analyze the email's subject and body, then determine the most appropriate folder for filing.
Use only the folder names provided in your response.
If the category is not clear, respond with Inbox.'''";

Failed to compile user Sieve script: Invalid expression ‘’‘You are an AI assistant […], respond with Inbox.’‘’: Invalid variable or function name “s” at line 3, column 14.

let "prompt" text:-EOT
You are an AI assistant tasked with classifying personal emails into specific folders.
Your job is to analyze the email's subject and body, then determine the most appropriate folder for filing.
Use only the folder names provided in your response.
If the category is not clear, respond with Inbox.
EOT;

Failed to compile user Sieve script: Unterminated multi-line string at line 3, column 18.


let "prompt" text:
You are an AI assistant tasked with classifying personal emails into specific folders.
Your job is to analyze the email's subject and body, then determine the most appropriate folder for filing.
Use only the folder names provided in your response.
If the category is not clear, respond with Inbox.
.
;

Failed to compile user Sieve script: Invalid expression You are an AI assistant […], respond with Inbox. : Invalid variable or function name “You” at line 3, column 18.

I understand that topics in this category are triaged by a bot first but a human reply will follow up. If I’d prefer a human-only reply, I’ll add the no-ai tag to my topic.

on

2

The documentation example is wrong: the ‘’’ triple-quote it uses isn’t valid Stalwart Sieve and can’t compile, so you weren’t missing anything. The way let works is that its value is a Sieve string whose contents are then parsed as an expression, so the prompt text has to be a single quoted expression string. An unquoted word (like “You”) is read as a variable name, which is the “Invalid variable or function name” error you hit, and the ‘’’ is read as an empty string followed by a stray quote.

The reliable form is a single quoted string with any embedded apostrophes escaped as \'. The simplest thing is to avoid embedded quotes in the prompt entirely, e.g.:

let “prompt” “‘You are an AI assistant that classifies personal emails into folders. Analyze the subject and body and choose the best folder from the list. If unclear, respond with Inbox.’”;

If you need apostrophes or the literal “Inbox” quotes in the text, escape the apostrophes with \’ and keep the whole thing on one logical string. I’ll get the docs replaced with an example that actually compiles. Note this needs the ai-model-interact permission on the user account.