[BUG-FIX] Swarm Router Bug Fix

Author: aparekh02

docs/quickstart.md

@@ -290,14 +290,14 @@ task = "Write a short story about a robot who discovers music."
 # --- Example 1: SequentialWorkflow ---
 # Agents run one after another in a chain: Writer -> Editor -> Reviewer.
 print("Running a Sequential Workflow...")
-sequential_router = SwarmRouter(swarm_type=SwarmType.SequentialWorkflow, agents=agents)
+sequential_router = SwarmRouter(swarm_type="SequentialWorkflow", agents=agents)
 sequential_output = sequential_router.run(task)
 print(f"Final Sequential Output:\n{sequential_output}\n")
 
 # --- Example 2: ConcurrentWorkflow ---
 # All agents receive the same initial task and run at the same time.
 print("Running a Concurrent Workflow...")
-concurrent_router = SwarmRouter(swarm_type=SwarmType.ConcurrentWorkflow, agents=agents)
+concurrent_router = SwarmRouter(swarm_type="ConcurrentWorkflow", agents=agents)
 concurrent_outputs = concurrent_router.run(task)
 # This returns a dictionary of each agent's output
 for agent_name, output in concurrent_outputs.items():
@@ -312,9 +312,9 @@ aggregator = Agent(
     model_name="gpt-4o-mini"
 )
 moa_router = SwarmRouter(
-    swarm_type=SwarmType.MixtureOfAgents,
+    swarm_type="MixtureOfAgents",
     agents=agents,
-    aggregator_agent=aggregator, # MoA requires an aggregator
+    aggregator_agent=aggregator,
 )
 aggregated_output = moa_router.run(task)
 print(f"Final Aggregated Output:\n{aggregated_output}\n")

docs/swarms/examples/swarm_router.md

@@ -29,7 +29,7 @@ GROQ_API_KEY=""
 
 ```python
 from swarms import Agent
-from swarms.structs.swarm_router import SwarmRouter, SwarmType
+from swarms.structs.swarm_router import SwarmRouter
 
 # Initialize specialized agents
 data_extractor_agent = Agent(
@@ -61,7 +61,7 @@ sequential_router = SwarmRouter(
     name="SequentialRouter",
     description="Process tasks in sequence",
     agents=[data_extractor_agent, summarizer_agent, financial_analyst_agent],
-    swarm_type=SwarmType.SequentialWorkflow,
+    swarm_type="SequentialWorkflow",
     max_loops=1
 )
 
@@ -76,7 +76,7 @@ concurrent_router = SwarmRouter(
     name="ConcurrentRouter",
     description="Process tasks concurrently",
     agents=[data_extractor_agent, summarizer_agent, financial_analyst_agent],
-    swarm_type=SwarmType.ConcurrentWorkflow,
+    swarm_type="ConcurrentWorkflow",
     max_loops=1
 )
 
@@ -91,8 +91,8 @@ rearrange_router = SwarmRouter(
     name="RearrangeRouter",
     description="Dynamically rearrange agents for optimal task processing",
     agents=[data_extractor_agent, summarizer_agent, financial_analyst_agent],
-    swarm_type=SwarmType.AgentRearrange,
-    flow=f"{data_extractor_agent.agent_name} -> {summarizer_agent.agent_name} -> {financial_analyst_agent.agent_name}",
+    swarm_type="AgentRearrange",
+    rearrange_flow=f"{data_extractor_agent.agent_name} -> {summarizer_agent.agent_name} -> {financial_analyst_agent.agent_name}",
     max_loops=1
 )
 
@@ -107,7 +107,7 @@ mixture_router = SwarmRouter(
     name="MixtureRouter",
     description="Combine multiple expert agents",
     agents=[data_extractor_agent, summarizer_agent, financial_analyst_agent],
-    swarm_type=SwarmType.MixtureOfAgents,
+    swarm_type="MixtureOfAgents",
     max_loops=1
 )
 
@@ -137,14 +137,35 @@ router = SwarmRouter(
     name="CustomRouter",
     description="Custom router configuration",
     agents=[data_extractor_agent, summarizer_agent, financial_analyst_agent],
-    swarm_type=SwarmType.SequentialWorkflow,
+    swarm_type="SequentialWorkflow",
     max_loops=3,
     autosave=True,
     verbose=True,
     output_type="json"
 )
 ```
 
+# SwarmType Reference
+
+## Valid SwarmType Values
+
+| Value | Description |
+|-------|-------------|
+| `"SequentialWorkflow"` | Execute agents in sequence |
+| `"ConcurrentWorkflow"` | Execute agents concurrently |
+| `"AgentRearrange"` | Dynamically rearrange agent execution order |
+| `"MixtureOfAgents"` | Combine outputs from multiple agents |
+| `"GroupChat"` | Enable group chat between agents |
+| `"MultiAgentRouter"` | Route tasks to appropriate agents |
+| `"AutoSwarmBuilder"` | Automatically build swarm configuration |
+| `"HiearchicalSwarm"` | Hierarchical agent organization |
+| `"MajorityVoting"` | Use majority voting for decisions |
+| `"MALT"` | Multi-Agent Learning and Training |
+| `"CouncilAsAJudge"` | Council-based evaluation system |
+| `"InteractiveGroupChat"` | Interactive group chat with agents |
+| `"HeavySwarm"` | Heavy swarm for complex tasks |
+| `"auto"` | Automatically select swarm type |
+
 # Best Practices
 
 ## Choose the appropriate swarm type based on your task requirements:
@@ -187,7 +208,7 @@ Here's a complete example showing how to use SwarmRouter in a real-world scenari
 ```python
 import os
 from swarms import Agent
-from swarms.structs.swarm_router import SwarmRouter, SwarmType
+from swarms.structs.swarm_router import SwarmRouter
 
 # Initialize specialized agents
 research_agent = Agent(
@@ -216,7 +237,7 @@ router = SwarmRouter(
     name="ResearchAnalysisRouter",
     description="Process research and analysis tasks",
     agents=[research_agent, analysis_agent, summary_agent],
-    swarm_type=SwarmType.SequentialWorkflow,
+    swarm_type="SequentialWorkflow",
     max_loops=1,
     verbose=True
 )

docs/swarms/structs/index.md

@@ -186,14 +186,14 @@ task = "Write a short story about a robot who discovers music."
 # --- Example 1: SequentialWorkflow ---
 # Agents run one after another in a chain: Writer -> Editor -> Reviewer.
 print("Running a Sequential Workflow...")
-sequential_router = SwarmRouter(swarm_type=SwarmType.SequentialWorkflow, agents=agents)
+sequential_router = SwarmRouter(swarm_type="SequentialWorkflow", agents=agents)
 sequential_output = sequential_router.run(task)
 print(f"Final Sequential Output:\n{sequential_output}\n")
 
 # --- Example 2: ConcurrentWorkflow ---
 # All agents receive the same initial task and run at the same time.
 print("Running a Concurrent Workflow...")
-concurrent_router = SwarmRouter(swarm_type=SwarmType.ConcurrentWorkflow, agents=agents)
+concurrent_router = SwarmRouter(swarm_type="ConcurrentWorkflow", agents=agents)
 concurrent_outputs = concurrent_router.run(task)
 # This returns a dictionary of each agent's output
 for agent_name, output in concurrent_outputs.items():
@@ -208,9 +208,9 @@ aggregator = Agent(
     model_name="gpt-4o-mini"
 )
 moa_router = SwarmRouter(
-    swarm_type=SwarmType.MixtureOfAgents,
+    swarm_type="MixtureOfAgents",
     agents=agents,
-    aggregator_agent=aggregator, # MoA requires an aggregator
+    aggregator_agent=aggregator,
 )
 aggregated_output = moa_router.run(task)
 print(f"Final Aggregated Output:\n{aggregated_output}\n")

swarms/structs/swarm_router.py

@@ -272,6 +272,40 @@ def reliability_check(self):
                     "SwarmRouter: Swarm type cannot be 'none'. Check the docs for all the swarm types available. https://docs.swarms.world/en/latest/swarms/structs/swarm_router/"
                 )
 
+            # Validate swarm type is a valid string
+            valid_swarm_types = [
+                "AgentRearrange",
+                "MixtureOfAgents",
+                "SequentialWorkflow",
+                "ConcurrentWorkflow",
+                "GroupChat",
+                "MultiAgentRouter",
+                "AutoSwarmBuilder",
+                "HiearchicalSwarm",
+                "auto",
+                "MajorityVoting",
+                "MALT",
+                "CouncilAsAJudge",
+                "InteractiveGroupChat",
+                "HeavySwarm",
+                "BatchedGridWorkflow",
+            ]
+
+            if not isinstance(self.swarm_type, str):
+                raise SwarmRouterConfigError(
+                    f"SwarmRouter: swarm_type must be a string, not {type(self.swarm_type).__name__}. "
+                    f"Valid types are: {', '.join(valid_swarm_types)}. "
+                    "Use swarm_type='SequentialWorkflow' (string), NOT SwarmType.SequentialWorkflow. "
+                    "See https://docs.swarms.world/en/latest/swarms/structs/swarm_router/"
+                )
+
+            if self.swarm_type not in valid_swarm_types:
+                raise SwarmRouterConfigError(
+                    f"SwarmRouter: Invalid swarm_type '{self.swarm_type}'. "
+                    f"Valid types are: {', '.join(valid_swarm_types)}. "
+                    "See https://docs.swarms.world/en/latest/swarms/structs/swarm_router/"
+                )
+
             if (
                 self.swarm_type != "HeavySwarm"
                 and self.agents is None