From f8db7fccb6e8ee0da10a695bf333c7d9a38a441a Mon Sep 17 00:00:00 2001
From: Yiorgis Gozadinos <ggozadinos@gmail.com>
Date: Wed, 8 Apr 2026 13:54:53 +0300
Subject: [PATCH] fix: apply config.prompts.domain_preamble in generated skills

---
 .../rag/skill_generator/templates/__init__.py.j2  |  4 ++++
 tests/test_skill_generator.py                     | 15 +++++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/haiku_rag_slim/haiku/rag/skill_generator/templates/__init__.py.j2 b/haiku_rag_slim/haiku/rag/skill_generator/templates/__init__.py.j2
index 40953416..fe597b15 100644
--- a/haiku_rag_slim/haiku/rag/skill_generator/templates/__init__.py.j2
+++ b/haiku_rag_slim/haiku/rag/skill_generator/templates/__init__.py.j2
@@ -79,6 +79,10 @@ def create_skill(
 
     tools = create_skill_tools(db_path, config, SkillState, _TOOL_NAMES)
     extras = create_skill_extras(db_path, config)
+
+    if config.prompts.domain_preamble and instructions:
+        instructions = f"{config.prompts.domain_preamble}\n\n{instructions}"
+
     return Skill(
         metadata=metadata,
         instructions=instructions,
diff --git a/tests/test_skill_generator.py b/tests/test_skill_generator.py
index 7730f86e..3127342c 100644
--- a/tests/test_skill_generator.py
+++ b/tests/test_skill_generator.py
@@ -273,6 +273,21 @@ class TestRenderTemplates:
         assert "create_skill_extras" in content
         assert "extras=extras" in content
 
+    def test_domain_preamble_applied_to_instructions(self, tmp_path):
+        render_templates(
+            output_dir=tmp_path,
+            name="docs",
+            description="A docs skill.",
+            tool_names=["search"],
+        )
+        init = tmp_path / "docs-skill" / "docs_skill" / "__init__.py"
+        content = init.read_text()
+        assert "config.prompts.domain_preamble" in content
+        assert (
+            'instructions = f"{config.prompts.domain_preamble}\\n\\n{instructions}"'
+            in content
+        )
+
     def test_create_skill_accepts_optional_params(self, tmp_path):
         render_templates(
             output_dir=tmp_path,