feat: user defined custom tools as part of workflow execution (#94)

* feat: add custom tools functionality

* Show tools in nodes

* integrate tool calling with pipeline engine

api/alembic/versions/ebc80cea7965_add_tools_model.py

@@ -0,0 +1,92 @@
+"""add tools model
+
+Revision ID: ebc80cea7965
+Revises: 36b5dbf670e4
+Create Date: 2026-01-01 10:13:50.807135
+
+"""
+
+from typing import Sequence, Union
+
+import sqlalchemy as sa
+from alembic import op
+from sqlalchemy.dialects import postgresql
+
+# revision identifiers, used by Alembic.
+revision: str = "ebc80cea7965"
+down_revision: Union[str, None] = "36b5dbf670e4"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    sa.Enum("active", "archived", "draft", name="tool_status").create(op.get_bind())
+    sa.Enum("http_api", "native", "integration", name="tool_category").create(
+        op.get_bind()
+    )
+    op.create_table(
+        "tools",
+        sa.Column("id", sa.Integer(), nullable=False),
+        sa.Column("tool_uuid", sa.String(length=36), nullable=False),
+        sa.Column("organization_id", sa.Integer(), nullable=False),
+        sa.Column("name", sa.String(length=255), nullable=False),
+        sa.Column("description", sa.String(), nullable=True),
+        sa.Column(
+            "category",
+            postgresql.ENUM(
+                "http_api",
+                "native",
+                "integration",
+                name="tool_category",
+                create_type=False,
+            ),
+            nullable=False,
+        ),
+        sa.Column("icon", sa.String(length=50), nullable=True),
+        sa.Column("icon_color", sa.String(length=7), nullable=True),
+        sa.Column(
+            "status",
+            postgresql.ENUM(
+                "active", "archived", "draft", name="tool_status", create_type=False
+            ),
+            server_default=sa.text("'active'::tool_status"),
+            nullable=False,
+        ),
+        sa.Column("definition", sa.JSON(), nullable=False),
+        sa.Column("created_by", sa.Integer(), nullable=False),
+        sa.Column("created_at", sa.DateTime(timezone=True), nullable=True),
+        sa.Column("updated_at", sa.DateTime(timezone=True), nullable=True),
+        sa.ForeignKeyConstraint(
+            ["created_by"],
+            ["users.id"],
+        ),
+        sa.ForeignKeyConstraint(
+            ["organization_id"], ["organizations.id"], ondelete="CASCADE"
+        ),
+        sa.PrimaryKeyConstraint("id"),
+        sa.UniqueConstraint("organization_id", "name", name="unique_org_tool_name"),
+    )
+    op.create_index("ix_tools_category", "tools", ["category"], unique=False)
+    op.create_index(
+        "ix_tools_organization_id", "tools", ["organization_id"], unique=False
+    )
+    op.create_index("ix_tools_status", "tools", ["status"], unique=False)
+    op.create_index(op.f("ix_tools_tool_uuid"), "tools", ["tool_uuid"], unique=True)
+    op.create_index("ix_tools_uuid", "tools", ["tool_uuid"], unique=False)
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_index("ix_tools_uuid", table_name="tools")
+    op.drop_index(op.f("ix_tools_tool_uuid"), table_name="tools")
+    op.drop_index("ix_tools_status", table_name="tools")
+    op.drop_index("ix_tools_organization_id", table_name="tools")
+    op.drop_index("ix_tools_category", table_name="tools")
+    op.drop_table("tools")
+    sa.Enum("http_api", "native", "integration", name="tool_category").drop(
+        op.get_bind()
+    )
+    sa.Enum("active", "archived", "draft", name="tool_status").drop(op.get_bind())
+    # ### end Alembic commands ###