feat: add system prompt to chat tool for better collaborative thinking

- Add CHAT_PROMPT to establish Gemini as senior developer partner
- Update handle_chat to use system prompt for consistent context
- Emphasize edge case exploration and deep thinking in prompts
- Enable thoughtful brainstorming and validation capabilities

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

prompts/__init__.py

@@ -2,7 +2,7 @@
 System prompts for Gemini tools
 """
 
-from .tool_prompts import (ANALYZE_PROMPT, DEBUG_ISSUE_PROMPT,
+from .tool_prompts import (ANALYZE_PROMPT, CHAT_PROMPT, DEBUG_ISSUE_PROMPT,
                            REVIEW_CODE_PROMPT, THINK_DEEPER_PROMPT)
 
 __all__ = [
@@ -10,4 +10,5 @@ __all__ = [
     "REVIEW_CODE_PROMPT",
     "DEBUG_ISSUE_PROMPT",
     "ANALYZE_PROMPT",
+    "CHAT_PROMPT",
 ]

prompts/tool_prompts.py

@@ -111,3 +111,25 @@ Focus on:
 
 Be thorough but concise. Prioritize the most important findings and always provide
 concrete examples and suggestions for improvement."""
+
+CHAT_PROMPT = """You are a senior development partner and collaborative thinking companion to Claude Code.
+You excel at brainstorming, validating ideas, and providing thoughtful second opinions on technical decisions.
+
+Your collaborative approach:
+1. Engage deeply with shared ideas - build upon, extend, and explore alternatives
+2. Think through edge cases, failure modes, and unintended consequences
+3. Provide balanced perspectives considering trade-offs and implications
+4. Challenge assumptions constructively while respecting the existing approach
+5. Offer concrete examples and actionable insights
+
+When brainstorming or discussing:
+- Consider multiple angles and approaches
+- Identify potential pitfalls early
+- Suggest creative solutions and alternatives
+- Think about scalability, maintainability, and real-world usage
+- Draw from industry best practices and patterns
+
+Always approach discussions as a peer - be direct, technical, and thorough. Your goal is to be 
+the ideal thinking partner who helps explore ideas deeply, validates approaches, and uncovers 
+insights that might be missed in solo analysis. Think step by step through complex problems 
+and don't hesitate to explore tangential but relevant considerations."""

server.py

@@ -146,17 +146,21 @@ async def handle_call_tool(
 async def handle_chat(arguments: Dict[str, Any]) -> List[TextContent]:
     """Handle general chat requests"""
     from config import TEMPERATURE_BALANCED
+    from prompts import CHAT_PROMPT
     from utils import read_files
 
     prompt = arguments.get("prompt", "")
     context_files = arguments.get("context_files", [])
     temperature = arguments.get("temperature", TEMPERATURE_BALANCED)
 
-    # Build context if files provided
-    full_prompt = prompt
+    # Build the full prompt with system context
+    user_content = prompt
     if context_files:
         file_content, _ = read_files(context_files)
-        full_prompt = f"{prompt}\n\n=== CONTEXT FILES ===\n{file_content}\n=== END CONTEXT ==="
+        user_content = f"{prompt}\n\n=== CONTEXT FILES ===\n{file_content}\n=== END CONTEXT ==="
+    
+    # Combine system prompt with user content
+    full_prompt = f"{CHAT_PROMPT}\n\n=== USER REQUEST ===\n{user_content}\n=== END REQUEST ===\n\nPlease provide a thoughtful, comprehensive response:"
 
     try:
         model = genai.GenerativeModel(