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skills/strict-tool-implementer/workflow/phase-3-error-handling.md

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+# Phase 3: Error Handling & Validation
+
+**Objective**: Handle errors and edge cases in agent workflows
+
+## Key Error Scenarios
+
+### 1. Tool Execution Failures
+
+```python
+def execute_tool_safely(tool_name: str, tool_input: Dict) -> Dict:
+    """Execute tool with error handling."""
+    try:
+        tool_function = TOOL_FUNCTIONS[tool_name]
+        result = tool_function(**tool_input)
+        return {"success": True, "data": result}
+
+    except Exception as e:
+        logger.error(f"Tool {tool_name} failed: {e}")
+        return {
+            "success": False,
+            "error": str(e),
+            "message": "Tool execution failed. Please try again."
+        }
+```
+
+### 2. Safety Refusals
+
+```python
+if response.stop_reason == "refusal":
+    logger.warning("Agent refused request")
+    # Don't retry - respect safety boundaries
+    return {"error": "Request cannot be completed"}
+```
+
+### 3. Max Turns Exceeded
+
+```python
+if turn >= max_turns:
+    logger.warning("Agent exceeded max turns")
+    return {
+        "error": "Task too complex",
+        "partial_progress": extract_progress(messages)
+    }
+```
+
+### 4. Invalid Tool Name
+
+```python
+# With strict mode, tool names are guaranteed valid
+# But external factors can cause issues
+if tool_name not in TOOL_FUNCTIONS:
+    logger.error(f"Unknown tool: {tool_name}")
+    return {"error": f"Tool {tool_name} not implemented"}
+```
+
+## Output
+
+Robust error handling for production agent workflows.