Implement Phase 3: dynamic graph builder, blueprint persistence, and CRUD API
- Add dynamic_graph_builder.py that constructs LangGraph graphs at runtime
from frontend CouncilBlueprint JSON (no more hardcoded graphs in production)
- Add PostgreSQL persistence via SQLAlchemy async with Blueprint model
- Add blueprint CRUD endpoints (POST/GET/PUT/DELETE /api/councils/)
- Add POST /api/councils/{id}/run to execute blueprints dynamically
- Add Alembic migration infrastructure with initial blueprints table
- Add database.py with async engine and SQLite fallback for dev/test
- Fix missing typing-extensions and add aiosqlite dependency
- Add 42 new tests (80/80 total passing) covering dynamic graph building,
blueprint service CRUD, and API integration
https://claude.ai/code/session_014yZUxrPsgZbvkebXbCXR4U
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16 changed files with 1698 additions and 11 deletions
330
backend/tests/test_dynamic_graph_builder.py
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backend/tests/test_dynamic_graph_builder.py
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"""
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Tests for the dynamic graph builder (Phase 3).
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Verifies that build_graph_from_blueprint correctly creates LangGraph graphs
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from JSON blueprints matching the frontend's CouncilBlueprint format.
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All LLM calls are mocked.
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"""
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import sys
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import os
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sys.path.insert(0, os.path.join(os.path.dirname(__file__), ".."))
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import pytest
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from unittest.mock import patch, MagicMock
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from services.dynamic_graph_builder import (
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build_graph_from_blueprint,
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_make_agent_node,
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_make_critic_node,
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_make_conditional_router,
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_is_critic_like,
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_get_llm,
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)
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from services.graph_builder import create_initial_state
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from state import CouncilState, APPROVAL_THRESHOLD, MAX_ITERATIONS
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# ---------------------------------------------------------------------------
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# Sample blueprints for testing
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# ---------------------------------------------------------------------------
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SIMPLE_LINEAR_BLUEPRINT = {
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"version": 1,
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"name": "Simple Linear",
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"nodes": [
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{
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"id": "node-1",
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"label": "Writer",
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"systemPrompt": "You are a professional writer.",
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"model": "claude-3-5-sonnet",
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"tools": {"webSearch": False, "pdfReader": False},
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"position": {"x": 0, "y": 0},
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},
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{
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"id": "node-2",
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"label": "Editor",
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"systemPrompt": "You are a professional editor. Polish the text.",
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"model": "claude-3-5-sonnet",
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"tools": {"webSearch": False, "pdfReader": False},
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"position": {"x": 300, "y": 0},
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},
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],
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"edges": [
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{"id": "edge-1", "source": "node-1", "target": "node-2", "type": "linear"},
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],
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}
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CYCLIC_BLUEPRINT = {
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"version": 1,
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"name": "Cyclic Council",
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"nodes": [
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{
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"id": "master",
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"label": "Master Agent",
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"systemPrompt": "You are the master writer.",
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"model": "claude-3-5-sonnet",
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"tools": {"webSearch": False, "pdfReader": False},
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"position": {"x": 0, "y": 0},
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},
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{
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"id": "critic",
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"label": "Critic Agent",
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"systemPrompt": "You are the critic. Evaluate and score the draft.",
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"model": "claude-3-5-sonnet",
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"tools": {"webSearch": False, "pdfReader": False},
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"position": {"x": 300, "y": 0},
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},
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{
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"id": "writer",
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"label": "Final Writer",
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"systemPrompt": "You polish approved drafts.",
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"model": "claude-3-5-sonnet",
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"tools": {"webSearch": False, "pdfReader": False},
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"position": {"x": 600, "y": 0},
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},
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],
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"edges": [
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{"id": "e1", "source": "master", "target": "critic", "type": "linear"},
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{
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"id": "e2",
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"source": "critic",
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"target": "master",
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"type": "conditional",
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"condition": "rework",
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},
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{
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"id": "e3",
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"source": "critic",
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"target": "writer",
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"type": "conditional",
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"condition": "approve",
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},
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],
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}
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# ---------------------------------------------------------------------------
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# Test: critic detection heuristic
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# ---------------------------------------------------------------------------
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class TestCriticDetection:
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def test_detects_critic_keyword(self):
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assert _is_critic_like("You are the critic. Evaluate drafts.") is True
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def test_detects_evaluate_keyword(self):
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assert _is_critic_like("Your role is to evaluate and score.") is True
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def test_detects_review_keyword(self):
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assert _is_critic_like("Review the document for quality.") is True
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def test_no_match_for_writer(self):
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assert _is_critic_like("You are a professional writer.") is False
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def test_case_insensitive(self):
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assert _is_critic_like("You are the CRITIC agent.") is True
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# ---------------------------------------------------------------------------
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# Test: conditional routing
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# ---------------------------------------------------------------------------
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class TestConditionalRouter:
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def test_routes_to_correct_target(self):
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edges = [
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{"target": "node-a", "condition": "rework"},
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{"target": "node-b", "condition": "approve"},
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]
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router = _make_conditional_router("source", edges, None)
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state = create_initial_state("topic", "run-1")
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state["route_decision"] = "approve"
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assert router(state) == "node-b"
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def test_routes_rework(self):
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edges = [
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{"target": "node-a", "condition": "rework"},
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{"target": "node-b", "condition": "approve"},
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]
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router = _make_conditional_router("source", edges, None)
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state = create_initial_state("topic", "run-1")
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state["route_decision"] = "rework"
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assert router(state) == "node-a"
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def test_unknown_decision_uses_linear_fallback(self):
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edges = [
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{"target": "node-a", "condition": "rework"},
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]
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router = _make_conditional_router("source", edges, "fallback-node")
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state = create_initial_state("topic", "run-1")
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state["route_decision"] = "unknown"
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assert router(state) == "fallback-node"
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def test_unknown_decision_uses_first_conditional_as_fallback(self):
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edges = [
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{"target": "node-a", "condition": "rework"},
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{"target": "node-b", "condition": "approve"},
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]
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router = _make_conditional_router("source", edges, None)
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state = create_initial_state("topic", "run-1")
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state["route_decision"] = "unknown"
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assert router(state) == "node-a"
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# ---------------------------------------------------------------------------
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# Test: agent node factory
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# ---------------------------------------------------------------------------
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class TestAgentNodeFactory:
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def test_agent_node_returns_draft(self):
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mock_response = MagicMock()
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mock_response.content = "Generated content about AI."
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with patch("services.dynamic_graph_builder.ChatAnthropic") as MockLLM:
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MockLLM.return_value.invoke.return_value = mock_response
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node_fn = _make_agent_node("node-1", "Writer", "You write.", "claude-3-5-sonnet")
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state = create_initial_state("AI basics", "run-1")
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result = node_fn(state)
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assert result["current_draft"] == "Generated content about AI."
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assert result["active_node"] == "node-1"
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assert result["iteration_count"] == 1
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def test_agent_node_with_existing_draft_and_feedback(self):
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mock_response = MagicMock()
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mock_response.content = "Improved draft."
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with patch("services.dynamic_graph_builder.ChatAnthropic") as MockLLM:
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MockLLM.return_value.invoke.return_value = mock_response
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node_fn = _make_agent_node("node-1", "Writer", "You write.", "claude-3-5-sonnet")
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state = create_initial_state("AI", "run-1")
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state["current_draft"] = "First draft"
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state["feedback_history"] = ["Needs more detail"]
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state["iteration_count"] = 1
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result = node_fn(state)
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assert result["current_draft"] == "Improved draft."
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assert result["iteration_count"] == 2
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# ---------------------------------------------------------------------------
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# Test: critic node factory
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# ---------------------------------------------------------------------------
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class TestCriticNodeFactory:
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def test_critic_node_approves_high_score(self):
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mock_response = MagicMock()
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mock_response.content = "SCORE: 9\nVERDICT: approve\nFEEDBACK:\nExcellent work."
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with patch("services.dynamic_graph_builder.ChatAnthropic") as MockLLM:
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MockLLM.return_value.invoke.return_value = mock_response
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node_fn = _make_critic_node("critic-1", "Critic", "You evaluate.", "claude-3-5-sonnet")
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state = create_initial_state("Topic", "run-1")
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state["current_draft"] = "A great draft"
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result = node_fn(state)
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assert result["route_decision"] == "approve"
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assert result["critic_score"] == 9.0
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def test_critic_node_reworks_low_score(self):
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mock_response = MagicMock()
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mock_response.content = "SCORE: 4\nVERDICT: rework\nFEEDBACK:\nNeeds more structure."
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with patch("services.dynamic_graph_builder.ChatAnthropic") as MockLLM:
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MockLLM.return_value.invoke.return_value = mock_response
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node_fn = _make_critic_node("critic-1", "Critic", "You evaluate.", "claude-3-5-sonnet")
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state = create_initial_state("Topic", "run-1")
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state["current_draft"] = "Draft"
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result = node_fn(state)
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assert result["route_decision"] == "rework"
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assert result["critic_score"] == 4.0
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assert len(result["feedback_history"]) == 1
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assert "structure" in result["feedback_history"][0]
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def test_critic_safety_valve_at_max_iterations(self):
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node_fn = _make_critic_node("critic-1", "Critic", "Evaluate.", "claude-3-5-sonnet")
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state = create_initial_state("Topic", "run-1")
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state["current_draft"] = "Draft"
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state["iteration_count"] = MAX_ITERATIONS
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result = node_fn(state)
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assert result["route_decision"] == "approve"
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assert result["critic_score"] == APPROVAL_THRESHOLD
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# ---------------------------------------------------------------------------
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# Test: build_graph_from_blueprint
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# ---------------------------------------------------------------------------
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class TestBuildGraphFromBlueprint:
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def test_rejects_empty_blueprint(self):
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with pytest.raises(ValueError, match="no nodes"):
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build_graph_from_blueprint({"version": 1, "name": "Empty", "nodes": [], "edges": []})
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def test_builds_linear_graph(self):
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"""A simple linear blueprint should compile without error."""
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graph = build_graph_from_blueprint(SIMPLE_LINEAR_BLUEPRINT)
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assert graph is not None
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def test_builds_cyclic_graph(self):
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"""A cyclic blueprint with conditional edges should compile."""
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graph = build_graph_from_blueprint(CYCLIC_BLUEPRINT)
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assert graph is not None
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def test_entry_point_is_node_with_no_incoming(self):
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"""The entry point should be the node that has no incoming edges."""
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# In CYCLIC_BLUEPRINT, 'master' has no incoming edges except from critic (conditional rework),
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# but critic->master is an edge so master IS a target. The first node without incoming = master
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# Actually master IS a target of the rework edge. Let's verify with simple linear.
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graph = build_graph_from_blueprint(SIMPLE_LINEAR_BLUEPRINT)
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assert graph is not None # node-1 has no incoming, so it's the entry
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def test_single_node_blueprint(self):
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"""A single node with no edges should work (trivial graph)."""
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bp = {
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"version": 1,
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"name": "Single",
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"nodes": [
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{
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"id": "only-node",
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"label": "Solo Agent",
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"systemPrompt": "You work alone.",
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"model": "claude-3-5-sonnet",
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"tools": {"webSearch": False, "pdfReader": False},
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"position": {"x": 0, "y": 0},
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}
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],
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"edges": [],
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}
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graph = build_graph_from_blueprint(bp)
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assert graph is not None
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# ---------------------------------------------------------------------------
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# Test: model lookup
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# ---------------------------------------------------------------------------
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class TestModelLookup:
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def test_unknown_model_raises(self):
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with pytest.raises(ValueError, match="Unknown model"):
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_get_llm("nonexistent-model")
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def test_claude_model_creates_instance(self):
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with patch("services.dynamic_graph_builder.ChatAnthropic") as MockLLM:
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llm = _get_llm("claude-3-5-sonnet")
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MockLLM.assert_called_once()
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def test_gpt4o_model_creates_instance(self):
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with patch("services.dynamic_graph_builder.ChatOpenAI") as MockLLM:
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llm = _get_llm("gpt-4o")
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MockLLM.assert_called_once()
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