feat: update dependencies to support new mcp-composer version

pyproject.toml

@@ -27,7 +27,7 @@ dependencies = [
     "pyarrow==19.0.0",
     "wikipedia==1.4.0",
     "qdrant-client==1.9.2",
-    "weaviate-client==4.10.2",
+    "weaviate-client>=4.10.2,<5.0.0",
     "faiss-cpu==1.9.0.post1",
     "types-cachetools>=5.5.0.20240820,<6.0.0",
     "pymongo==4.10.1",
@@ -37,7 +37,7 @@ dependencies = [
     'fastavro>=1.9.8,<2.0.0; python_version >= "3.13"',
     "redis>=5.2.1,<6.0.0",
     "metaphor-python==0.1.23",
-    'pywin32==307; sys_platform == "win32"',
+    'pywin32>=307,<400; sys_platform == "win32"',
     "langfuse==2.53.9",
     "metal_sdk==2.5.1",
     "MarkupSafe==3.0.2",
@@ -105,7 +105,8 @@ dependencies = [
     "arize-phoenix-otel>=0.6.1,<1.0.0",
     "openinference-instrumentation-langchain>=0.1.29,<0.1.52",
     # "crewai>=0.126.0",
-    "mcp>=1.10.1,<2.0.0",
+    "fastmcp==2.13.0",
+    "mcp>=1.17.0,<2.0.0",
     "uv==0.7.20",
     "scipy>=1.14.1,<1.16.2",
     "scrapegraph-py>=1.12.0,<2.0.0",

src/backend/base/pyproject.toml

@@ -32,11 +32,11 @@ dependencies = [
     "rich>=13.7.0,<14.0.0",
     "langchain-experimental>=0.3.4,<1.0.0",
     "sqlmodel==0.0.22",
-    "pydantic~=2.10.1",
+    "pydantic~=2.11.0",
     "pydantic-settings>=2.2.0,<3.0.0",
     "email-validator>=2.0.0",
     "typer>=0.13.0,<1.0.0",
-    "cachetools>=5.5.0,<6.0.0",
+    "cachetools>=6.0.0",
     "platformdirs>=4.2.0,<5.0.0",
     "python-multipart>=0.0.12,<1.0.0",
     "orjson==3.10.15",
@@ -80,7 +80,7 @@ dependencies = [
     "validators>=0.34.0,<1.0.0",
     "networkx>=3.4.2,<4.0.0",
     "json-repair>=0.30.3,<1.0.0",
-    "mcp~=1.10.1",
+    "mcp>=1.17.0,<2.0.0",
     "aiosqlite>=0.20.0,<1.0.0",
     "greenlet>=3.1.1,<4.0.0",
     "jsonquerylang>=1.1.1,<2.0.0",

src/lfx/pyproject.toml

@@ -26,7 +26,7 @@ dependencies = [
     "docstring-parser>=0.16,<1.0.0",
     "networkx>=3.4.2,<4.0.0",
     "nanoid>=2.0.0,<3.0.0",
-    "cachetools>=5.5.2,<6.0.0",
+    "cachetools>=6.0.0",
     "emoji>=2.14.1,<3.0.0",
     "chardet>=5.2.0,<6.0.0",
     "defusedxml>=0.7.1,<1.0.0",

src/lfx/src/lfx/services/mcp_composer/service.py

@@ -516,12 +516,15 @@ async def _start_project_composer_process(
                 f"(check {check + 1}/{max_startup_checks})"
             )
 
-            # Try to read any available stderr without blocking (only log if there's an error)
+            # Try to read any available stderr/stdout without blocking
             if process.stderr and select.select([process.stderr], [], [], 0)[0]:
                 try:
                     stderr_line = process.stderr.readline()
-                    if stderr_line and "ERROR" in stderr_line:
-                        await logger.aerror(f"MCP Composer error: {stderr_line.strip()}")
+                    if stderr_line:
+                        if "ERROR" in stderr_line:
+                            await logger.aerror(f"MCP Composer error: {stderr_line.strip()}")
+                        else:
+                            await logger.adebug(f"MCP Composer stderr: {stderr_line.strip()}")
                 except Exception:  # noqa: BLE001
                     pass
 

src/lfx/src/lfx/services/settings/base.py

@@ -292,9 +292,8 @@ class Settings(BaseSettings):
     # MCP Composer
     mcp_composer_enabled: bool = True
     """If set to False, Langflow will not start the MCP Composer service."""
-    mcp_composer_version: str = "~=0.1.0.7"
-    """Version constraint for mcp-composer when using uvx. Uses PEP 440 syntax.
-    ~=0.1.0.7 allows patch updates (0.1.0.x) but prevents minor/major version changes."""
+    mcp_composer_version: str = "==0.1.0.21"
+    """Version constraint for mcp-composer when using uvx. Uses PEP 440 syntax."""
 
     # Public Flow Settings
     public_flow_cleanup_interval: int = Field(default=3600, gt=600)