From 70d09fcc66ee8f6799aedad25d21d4642ae4943f Mon Sep 17 00:00:00 2001
From: Aakash Bakhle <48802744+aakashb95@users.noreply.github.com>
Date: Wed, 21 Jan 2026 15:52:41 +0530
Subject: [PATCH] fix: make llm aware about signatures in editor replies
 (#13332)

Fixes signatures being generated on top of existing signature in draft
for improve, tone change and grammar
---
 .../openai/openai_prompts/fix_spelling_grammar.liquid          | 3 ++-
 lib/integrations/openai/openai_prompts/improve.liquid          | 1 +
 lib/integrations/openai/openai_prompts/tone_rewrite.liquid     | 3 ++-
 3 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/lib/integrations/openai/openai_prompts/fix_spelling_grammar.liquid b/lib/integrations/openai/openai_prompts/fix_spelling_grammar.liquid
index 520487357..2a0e8c6d2 100644
--- a/lib/integrations/openai/openai_prompts/fix_spelling_grammar.liquid
+++ b/lib/integrations/openai/openai_prompts/fix_spelling_grammar.liquid
@@ -10,8 +10,9 @@ Important guidelines:
 - Ensure the output remains appropriate for customer support
 
 Super Important:
-- If the message has some markdown formatting, keep the formatting as it is. 
+- If the message has some markdown formatting, keep the formatting as it is.
 - Block quotes (lines starting with >) contain quoted text from the customer's previous message. Preserve this quoted text exactly as written (do not modify the customer's words inside the block quote), but DO improve the agent's reply that follows the block quote.
 - Ensure the output is in the user's original language
+- If the message contains a signature block (text after a `--` line), preserve the signature exactly as written without any modification. Do not add a signature if one is not already present.
 
 Output only the corrected message, with no preamble, tags, or explanation.
diff --git a/lib/integrations/openai/openai_prompts/improve.liquid b/lib/integrations/openai/openai_prompts/improve.liquid
index 7e3d35e82..8730d1b0f 100644
--- a/lib/integrations/openai/openai_prompts/improve.liquid
+++ b/lib/integrations/openai/openai_prompts/improve.liquid
@@ -38,6 +38,7 @@ Do NOT use the context to fill in gaps or add information the agent didn't inclu
 - Keep the improved message at a similar length to the draft (brief stays brief)
 - Preserve any markdown formatting
 - Block quotes (lines starting with `>`) contain quoted customer text—keep this unchanged, only improve the agent's reply
+- If the message contains a signature block (text after a `--` line), preserve the signature exactly as written without any modification. Do not add a signature if one is not already present.
 - Output in the same language as the draft
 - Output only the improved message, no commentary
 
diff --git a/lib/integrations/openai/openai_prompts/tone_rewrite.liquid b/lib/integrations/openai/openai_prompts/tone_rewrite.liquid
index c140a93df..6b62617f0 100644
--- a/lib/integrations/openai/openai_prompts/tone_rewrite.liquid
+++ b/lib/integrations/openai/openai_prompts/tone_rewrite.liquid
@@ -28,8 +28,9 @@ Important guidelines:
 - Do not remove critical details or instructions
 
 Super Important:
-- If the message has some markdown formatting, keep the formatting as it is. 
+- If the message has some markdown formatting, keep the formatting as it is.
 - Block quotes (lines starting with >) contain quoted text from the customer's previous message. Preserve this quoted text exactly as written (do not modify the customer's words inside the block quote), but DO improve the agent's reply that follows the block quote.
 - Ensure the output is in the user's original language
+- If the message contains a signature block (text after a `--` line), preserve the signature exactly as written without any modification. Do not add a signature if one is not already present.
 
 Output only the rewritten message without any preamble, tags or explanation.