refactor(prompt): remove unused skill functions and clean up code

backend/packages/harness/deerflow/agents/lead_agent/prompt.py

@@ -164,30 +164,6 @@ Skip simple one-off tasks.
 """
 
 
-def _skill_mutability_label(category: str) -> str:
-    return "[custom, editable]" if category == "custom" else "[built-in]"
-
-
-def clear_skills_system_prompt_cache() -> None:
-    _get_cached_skills_prompt_section.cache_clear()
-
-
-def _build_skill_evolution_section(skill_evolution_enabled: bool) -> str:
-    if not skill_evolution_enabled:
-        return ""
-    return """
-## Skill Self-Evolution
-After completing a task, consider creating or updating a skill when:
-- The task required 5+ tool calls to resolve
-- You overcame non-obvious errors or pitfalls
-- The user corrected your approach and the corrected version worked
-- You discovered a non-trivial, recurring workflow
-If you used a skill and encountered issues not covered by it, patch it immediately.
-Prefer patch over edit. Before creating a new skill, confirm with the user first.
-Skip simple one-off tasks.
-"""
-
-
 def _build_subagent_section(max_concurrent: int) -> str:
     """Build the subagent system prompt section with dynamic concurrency limit.
 

backend/uv.lock

@@ -885,6 +885,9 @@ dependencies = [
 ]
 
 [package.optional-dependencies]
+ollama = [
+    { name = "langchain-ollama" },
+]
 postgres = [
     { name = "asyncpg" },
     { name = "langgraph-checkpoint-postgres" },
@@ -914,6 +917,7 @@ requires-dist = [
     { name = "langchain-deepseek", specifier = ">=1.0.1" },
     { name = "langchain-google-genai", specifier = ">=4.2.1" },
     { name = "langchain-mcp-adapters", specifier = ">=0.1.0" },
+    { name = "langchain-ollama", marker = "extra == 'ollama'", specifier = ">=0.3.0" },
     { name = "langchain-openai", specifier = ">=1.1.7" },
     { name = "langfuse", specifier = ">=3.4.1" },
     { name = "langgraph", specifier = ">=1.0.6,<1.0.10" },
@@ -935,7 +939,7 @@ requires-dist = [
     { name = "tavily-python", specifier = ">=0.7.17" },
     { name = "tiktoken", specifier = ">=0.8.0" },
 ]
-provides-extras = ["postgres", "pymupdf"]
+provides-extras = ["postgres", "ollama", "pymupdf"]
 
 [[package]]
 name = "defusedxml"
@@ -1778,7 +1782,7 @@ wheels = [
 
 [[package]]
 name = "langchain-core"
-version = "1.2.17"
+version = "1.2.28"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "jsonpatch" },
@@ -1790,9 +1794,9 @@ dependencies = [
     { name = "typing-extensions" },
     { name = "uuid-utils" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/1d/93/36226f593df52b871fc24d494c274f3a6b2ac76763a2806e7d35611634a1/langchain_core-1.2.17.tar.gz", hash = "sha256:54aa267f3311e347fb2e50951fe08e53761cebfb999ab80e6748d70525bbe872", size = 836130, upload-time = "2026-03-02T22:47:55.846Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/f8/a4/317a1a3ac1df33a64adb3670bf88bbe3b3d5baa274db6863a979db472897/langchain_core-1.2.28.tar.gz", hash = "sha256:271a3d8bd618f795fdeba112b0753980457fc90537c46a0c11998516a74dc2cb", size = 846119, upload-time = "2026-04-08T18:19:34.867Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/be/90/073f33ab383a62908eca7ea699586dfea280e77182176e33199c80ddf22a/langchain_core-1.2.17-py3-none-any.whl", hash = "sha256:bf6bd6ce503874e9c2da1669a69383e967c3de1ea808921d19a9a6bff1a9fbbe", size = 502727, upload-time = "2026-03-02T22:47:54.537Z" },
+    { url = "https://files.pythonhosted.org/packages/a8/92/32f785f077c7e898da97064f113c73fbd9ad55d1e2169cf3a391b183dedb/langchain_core-1.2.28-py3-none-any.whl", hash = "sha256:80764232581eaf8057bcefa71dbf8adc1f6a28d257ebd8b95ba9b8b452e8c6ac", size = 508727, upload-time = "2026-04-08T18:19:32.823Z" },
 ]
 
 [[package]]
@@ -1837,6 +1841,19 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/03/81/b2479eb26861ab36be851026d004b2d391d789b7856e44c272b12828ece0/langchain_mcp_adapters-0.2.1-py3-none-any.whl", hash = "sha256:9f96ad4c64230f6757297fec06fde19d772c99dbdfbca987f7b7cfd51ff77240", size = 22708, upload-time = "2025-12-09T16:28:37.877Z" },
 ]
 
+[[package]]
+name = "langchain-ollama"
+version = "1.1.0"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "langchain-core" },
+    { name = "ollama" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/d4/9b/6641afe8a5bf807e454fd464eddfc7eb2f2df53cb0b29744381171f9c609/langchain_ollama-1.1.0.tar.gz", hash = "sha256:f776f56f6782ae4da7692579b94a6575906118318d1023b455d7207f9d059811", size = 133075, upload-time = "2026-04-07T02:48:00.873Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/2c/b2/c2acb076590a98bee2816ed5f285e00df162a34238f9e276e175e14ebc35/langchain_ollama-1.1.0-py3-none-any.whl", hash = "sha256:43ac83a6eacb0f43855810739794dd55019e0d9b17bdcf3ecb3b1991ac3b59dd", size = 31413, upload-time = "2026-04-07T02:47:59.642Z" },
+]
+
 [[package]]
 name = "langchain-openai"
 version = "1.1.7"
@@ -2569,6 +2586,19 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/17/d3/b64c356a907242d719fc668b71befd73324e47ab46c8ebbbede252c154b2/olefile-0.47-py2.py3-none-any.whl", hash = "sha256:543c7da2a7adadf21214938bb79c83ea12b473a4b6ee4ad4bf854e7715e13d1f", size = 114565, upload-time = "2023-12-01T16:22:51.518Z" },
 ]
 
+[[package]]
+name = "ollama"
+version = "0.6.1"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "httpx" },
+    { name = "pydantic" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/9d/5a/652dac4b7affc2b37b95386f8ae78f22808af09d720689e3d7a86b6ed98e/ollama-0.6.1.tar.gz", hash = "sha256:478c67546836430034b415ed64fa890fd3d1ff91781a9d548b3325274e69d7c6", size = 51620, upload-time = "2025-11-13T23:02:17.416Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/47/4f/4a617ee93d8208d2bcf26b2d8b9402ceaed03e3853c754940e2290fed063/ollama-0.6.1-py3-none-any.whl", hash = "sha256:fc4c984b345735c5486faeee67d8a265214a31cbb828167782dc642ce0a2bf8c", size = 14354, upload-time = "2025-11-13T23:02:16.292Z" },
+]
+
 [[package]]
 name = "onnxruntime"
 version = "1.20.1"