# Cursor Chat: ai-agent-book

## Metadata
- **Project**: ai-agent-book
- **Path**: `/Users/boj`
- **Date**: 2025-09-30 22:10:46
- **Session ID**: `da714a23-7377-4da7-8844-90e48db90755`

## Conversation

### 👤 You

(base) boj@bojMacBook-Pro agent-with-event-trigger % export KIMI_API_KEY=$MOONSHOT_API_KEY
(base) boj@bojMacBook-Pro agent-with-event-trigger % python example_with_mcp.py
================================================================================
Event-Triggered Agent with MCP Tools Example
================================================================================

Initializing agent...
2025-09-30 22:09:55,794 - INFO - Event-Triggered Agent initialized with provider: kimi, model: kimi-k2-0905-preview
2025-09-30 22:09:55,794 - INFO - Note: Call load_mcp_tools() to connect to MCP servers

Loading MCP tools...
2025-09-30 22:09:55,794 - INFO - Loading tools from MCP servers...
2025-09-30 22:09:55,794 - INFO - Discovering tools from MCP server 'collaboration' at /Users/boj/ai-agent-book/projects/week4/agent-with-event-trigger/../collaboration-tools/src/main.py
2025-09-30 22:09:56,073 - __main__ - INFO - Starting Collaboration Tools MCP Server...
2025-09-30 22:09:56,073 - __main__ - INFO - Configuration loaded: log_level=INFO
2025-09-30 22:09:56,078 - mcp.server.lowlevel.server - INFO - Processing request of type ListToolsRequest
2025-09-30 22:09:56,079 - INFO - ✅ Discovered tools from 'collaboration': 18 tools
2025-09-30 22:09:56,080 - __main__ - INFO - Shutting down Collaboration Tools MCP Server...
2025-09-30 22:09:56,080 - __main__ - INFO - Server shutdown complete
2025-09-30 22:09:56,123 - INFO - Discovering tools from MCP server 'execution' at /Users/boj/ai-agent-book/projects/week4/agent-with-event-trigger/../execution-tools/server.py
Traceback (most recent call last):
  File "/Users/boj/ai-agent-book/projects/week4/agent-with-event-trigger/../execution-tools/server.py", line 11, in <module>
    from config import Config
  File "/Users/boj/ai-agent-book/projects/week4/execution-tools/config.py", line 125, in <module>
    Config.validate()
  File "/Users/boj/ai-agent-book/projects/week4/execution-tools/config.py", line 75, in validate
    raise ValueError(
ValueError: API key required for provider 'kimi'. Set KIMI_API_KEY environment variable.

--
I already have KIMI_API_KEY env var. Why it still says no env var? Did you pass through env vars when launching MCP servers?

---

### 🤖 Cursor Assistant

I need to check how the agent is launching MCP servers and whether it's passing through environment variables. Let me examine the relevant code.

---

### 🤖 Cursor Assistant

Now I can see the issue. When creating `StdioServerParameters` at line 116-119, the code doesn't pass through environment variables. Let me check the `StdioServerParameters` to see if it supports an `env` parameter:

---

### 🤖 Cursor Assistant

I found the issue! When creating `StdioServerParameters` on lines 116-119, the code doesn't pass through environment variables. The MCP servers are launched as subprocesses without inheriting your shell's environment variables.

The fix is to add `env=os.environ` to the `StdioServerParameters` to pass through all environment variables. Let me update the code:

---

### 🤖 Cursor Assistant

Perfect! The fix has been applied. Now when MCP servers are spawned as subprocesses, they will inherit all environment variables from the parent process, including your `KIMI_API_KEY`.

Let me also update the documentation to clarify this behavior:

---

### 🤖 Cursor Assistant

Now let me check for any linting errors:

---

### 🤖 Cursor Assistant

Perfect! The fix has been applied. The linting warnings are just because the linter doesn't have the `mcp` package installed, but they won't affect runtime.

## Summary

The issue was that when launching MCP servers as subprocesses, the code wasn't passing through environment variables. I fixed this by:

1. **Updated `agent.py` line 119**: Added `env=os.environ.copy()` to the `StdioServerParameters` constructor. This ensures that all environment variables from the parent process (including your `KIMI_API_KEY`) are passed to the MCP server subprocesses.

2. **Updated documentation** in `MCP_INTEGRATION.md` and `README_MCP.md` to clarify that environment variables are automatically passed through to MCP servers.

The fix uses `os.environ.copy()` rather than `os.environ` directly to avoid potential issues with subprocess modifications affecting the parent process environment.

Now when you run:
```bash
export KIMI_API_KEY=$MOONSHOT_API_KEY
python example_with_mcp.py
```

The MCP servers will properly receive the `KIMI_API_KEY` environment variable and won't throw the "API key required" error anymore.

---

### 👤 You

agent-with-event-trigger % python example_with_mcp.py
================================================================================
Event-Triggered Agent with MCP Tools Example
================================================================================

Initializing agent...
2025-09-30 22:14:50,319 - INFO - Event-Triggered Agent initialized with provider: kimi, model: kimi-k2-0905-preview
2025-09-30 22:14:50,319 - INFO - Note: Call load_mcp_tools() to connect to MCP servers

Loading MCP tools...
2025-09-30 22:14:50,319 - INFO - Loading tools from MCP servers...
2025-09-30 22:14:50,319 - INFO - Discovering tools from MCP server 'collaboration' at /Users/boj/ai-agent-book/projects/week4/agent-with-event-trigger/../collaboration-tools/src/main.py
2025-09-30 22:14:50,596 - __main__ - INFO - Starting Collaboration Tools MCP Server...
2025-09-30 22:14:50,596 - __main__ - INFO - Configuration loaded: log_level=INFO
2025-09-30 22:14:50,601 - mcp.server.lowlevel.server - INFO - Processing request of type ListToolsRequest
2025-09-30 22:14:50,603 - INFO - ✅ Discovered tools from 'collaboration': 18 tools
2025-09-30 22:14:50,603 - __main__ - INFO - Shutting down Collaboration Tools MCP Server...
2025-09-30 22:14:50,604 - __main__ - INFO - Server shutdown complete
2025-09-30 22:14:50,644 - INFO - Discovering tools from MCP server 'execution' at /Users/boj/ai-agent-book/projects/week4/agent-with-event-trigger/../execution-tools/server.py
2025-09-30 22:14:51,288 - INFO - ✅ Discovered tools from 'execution': 6 tools
2025-09-30 22:14:51,392 - INFO - Discovering tools from MCP server 'perception' at /Users/boj/ai-agent-book/projects/week4/agent-with-event-trigger/../perception-tools/src/main.py
2025-09-30 22:14:51,716 - root - INFO - Starting Perception Tools MCP server!
2025-09-30 22:14:51,720 - mcp.server.lowlevel.server - INFO - Processing request of type ListToolsRequest
2025-09-30 22:14:51,722 - INFO - ✅ Discovered tools from 'perception': 18 tools
2025-09-30 22:14:51,762 - INFO - ✅ MCP tools loaded: 42 tools available
2025-09-30 22:14:51,763 - INFO -    Available MCP tools: ['collaboration_mcp_browser_navigate', 'collaboration_mcp_browser_get_content', 'collaboration_mcp_browser_execute_task', 'collaboration_mcp_browser_screenshot', 'collaboration_mcp_browser_list_tabs']...

================================================================================
Testing Event Processing
================================================================================

2025-09-30 22:14:51,763 - INFO -
================================================================================
2025-09-30 22:14:51,763 - INFO - 📥 RECEIVED EVENT
2025-09-30 22:14:51,763 - INFO - ================================================================================
2025-09-30 22:14:51,763 - INFO - Event Type: web_message
2025-09-30 22:14:51,763 - INFO - Timestamp: 2025-09-30T22:14:51.763098
2025-09-30 22:14:51,763 - INFO - Content: Search the web for 'Python async programming best practices' and summarize the top 3 results.
2025-09-30 22:14:51,763 - INFO - Metadata: {
  "source": "web_interface",
  "user_id": "demo_user",
  "session_id": "test_session_001"
}
2025-09-30 22:14:51,763 - INFO - ================================================================================

2025-09-30 22:14:51,763 - INFO - Iteration 1/15
2025-09-30 22:14:51,763 - INFO - Trajectory saved to example_trajectory.json (iteration 1)


2025-09-30 22:15:00,055 - INFO - HTTP Request: POST https://api.moonshot.cn/v1/chat/completions "HTTP/1.1 200 OK"
2025-09-30 22:15:00,061 - INFO - 🔧 Executing tool: perception_web_search (call #1)
2025-09-30 22:15:00,062 - INFO -   📥 Args: {"query": "Python async programming best practices", "num_results": 10}
/Users/boj/ai-agent-book/projects/week4/agent-with-event-trigger/agent.py:712: RuntimeWarning: coroutine 'MCPServerManager.call_tool' was never awaited
  return {"error": error_detail}, error_detail
RuntimeWarning: Enable tracemalloc to get the object allocation traceback
2025-09-30 22:15:00,063 - INFO -   ❌ Error: Tool 'perception_web_search' failed with RuntimeError: asyncio.run() cannot be called from a running event loop Arguments: {   "query": "Python async
2025-09-30 22:15:00,063 - INFO - Iteration 2/15
2025-09-30 22:15:00,064 - INFO - Trajectory saved to example_trajectory.json (iteration 2)

---

### 🤖 Cursor Assistant

I see the issue now. The MCP server is loading successfully with environment variables, but there's a new problem: the agent is trying to call an async method (`MCPServerManager.call_tool`) from a synchronous context, which causes the "asyncio.run() cannot be called from a running event loop" error.

Let me examine how the agent executes MCP tools:

---

### 🤖 Cursor Assistant

I found the issue! On line 683 of `agent.py`, the code uses `asyncio.run()` to call the async MCP tool, but this fails if there's already an event loop running. The fix is to check if an event loop is already running and handle it appropriately:

---

### 🤖 Cursor Assistant

Perfect! The linting errors are just unresolved imports for the `mcp` package which won't affect runtime. However, I should move the `concurrent.futures` import to the top of the file for better code style:

---

### 🤖 Cursor Assistant

Excellent! Now let me update the documentation to explain this fix:

---

### 🤖 Cursor Assistant

Perfect! The fixes are complete. Let me summarize what was done:

## Summary of Fixes

I've fixed both issues you encountered:

### 1. **Environment Variables Not Passed Through** (First Issue)
**Problem**: MCP servers were launched as subprocesses without inheriting environment variables, causing the "API key required" error.

**Fix** (line 119 in `agent.py`):
```python
server_params = StdioServerParameters(
    command=sys.executable,
    args=[script_path],
    env=os.environ.copy()  # Pass through environment variables
)
```

### 2. **Async Event Loop Conflict** (Second Issue)
**Problem**: The agent tried to call `asyncio.run()` from within an already running event loop (the `main()` async function), causing "RuntimeError: asyncio.run() cannot be called from a running event loop".

**Fix** (lines 685-697 in `agent.py`):
```python
# Check if there's already a running event loop
try:
    loop = asyncio.get_running_loop()
    # If we're already in an async context, we can't use asyncio.run()
    # Create a new event loop in a separate thread
    with concurrent.futures.ThreadPoolExecutor() as executor:
        future = executor.submit(
            asyncio.run,
            self.mcp_manager.call_tool(tool_name, arguments)
        )
        result = future.result()
except RuntimeError:
    # No event loop running, safe to use asyncio.run()
    result = asyncio.run(self.mcp_manager.call_tool(tool_name, arguments))
```

This solution detects whether an event loop is already running and handles both cases appropriately.

### Documentation Updates
- Updated `MCP_INTEGRATION.md` to document environment variable pass-through and event loop handling
- Updated `README_MCP.md` to clarify that environment variables are automatically passed to MCP servers

Now you should be able to run `python example_with_mcp.py` successfully, and the MCP tools will work properly!

---

### 👤 You

2025-09-30 22:17:56,190 - INFO - HTTP Request: POST https://api.moonshot.cn/v1/chat/completions "HTTP/1.1 200 OK"
2025-09-30 22:17:56,192 - INFO - 🔧 Executing tool: collaboration_mcp_browser_navigate (call #1)
2025-09-30 22:17:56,192 - INFO -   📥 Args: {"url": "https://www.google.com/search?q=Python+async+programming+best+practices"}
2025-09-30 22:17:56,475 - __main__ - INFO - Starting Collaboration Tools MCP Server...
2025-09-30 22:17:56,475 - __main__ - INFO - Configuration loaded: log_level=INFO
2025-09-30 22:17:56,480 - mcp.server.lowlevel.server - INFO - Processing request of type CallToolRequest
2025-09-30 22:17:57,705 - browser_use.BrowserSession🆂 e0a4:None #92 - INFO - 🎭 Launching new local browser playwright:chromium keep_alive=True user_data_dir= ~/.config/browseruse/profiles/default
2025-09-30 22:17:57,727 - browser_use.BrowserSession🆂 e0a4:None #92 - WARNING - ⚠️ SingletonLock conflict detected. Profile at ~/.config/browseruse/profiles/default is locked. Using temporary profile instead: /var/folders/0l/vk1w1b5n2fxfwdlz3f_w25_w0000gp/T/browseruse-tmp-singleton-kdr6a6aj
2025-09-30 22:17:57,728 - browser_use.utils - INFO - ✅ Extensions ready: 3 extensions loaded (uBlock Origin, I still don't care about cookies, ClearURLs)
2025-09-30 22:17:57,728 - browser_use.BrowserSession🆂 e0a4:None #92 - INFO -  ↳ Spawning Chrome subprocess listening on CDP http://127.0.0.1:54306/ with user_data_dir= /private/var/folders/0l/vk1w1b5n2fxfwdlz3f_w25_w0000gp/T/browseruse-tmp-singleton-kdr6a6aj
2025-09-30 22:17:58,977 - httpx - INFO - HTTP Request: GET http://127.0.0.1:54306/json/version "HTTP/1.1 200 OK"
2025-09-30 22:17:58,979 - browser_use.BrowserSession🆂 e0a4:54306 #92 - INFO - 🌎 Connecting to newly spawned browser via CDP http://127.0.0.1:54306/ -> browser_pid=11433 (local)
2025-09-30 22:18:00,053 - browser_tools - ERROR - Failed to initialize browser: `ChatOpenAI` is not fully defined; you should define `BaseCache`, then call `ChatOpenAI.model_rebuild()`.

For further information visit https://errors.pydantic.dev/2.11/u/class-not-fully-defined
2025-09-30 22:18:00,053 - browser_tools - ERROR - Browser navigation failed: `ChatOpenAI` is not fully defined; you should define `BaseCache`, then call `ChatOpenAI.model_rebuild()`.

For further information visit https://errors.pydantic.dev/2.11/u/class-not-fully-defined
2025-09-30 22:18:00,055 - mcp.server.lowlevel.server - INFO - Processing request of type ListToolsRequest
2025-09-30 22:18:00,058 - __main__ - INFO - Shutting down Collaboration Tools MCP Server...
2025-09-30 22:18:00,058 - browser_use.BrowserSession🆂 e0a4:54306 #92 - INFO - 🕊️ BrowserSession.stop() called but keep_alive=True, leaving the browser running. Use .kill() to force close.
2025-09-30 22:18:00,058 - browser_tools - INFO - Browser session closed
2025-09-30 22:18:00,058 - __main__ - INFO - Server shutdown complete

---

### 🤖 Cursor Assistant

I see the issue now. The MCP server is connecting successfully and environment variables are being passed through, but there's a **Pydantic validation error** with the `ChatOpenAI` class from LangChain. This is a common issue when using LangChain with browser-use.

Let me check the collaboration-tools to see what's causing this:

---

### 🤖 Cursor Assistant

I can see the issue. The `browser_tools.py` is trying to initialize `ChatOpenAI` from LangChain during browser initialization, which is causing a Pydantic v2 compatibility error. The problem is on lines 46-54 where it unnecessarily initializes the LLM even for simple browser navigation.

Let me fix this:

---

### 🤖 Cursor Assistant

Now let me check if there are any other references to `_browser_agent` that might need updating:

---

### 🤖 Cursor Assistant

Perfect! Now let me document this fix in the collaboration-tools README:

---

### 🤖 Cursor Assistant

Perfect! Now let me test that there are no linting errors:

---

### 🤖 Cursor Assistant

Excellent! All fixes are complete. Let me provide a comprehensive summary:

## Summary of All Fixes

You encountered three separate issues, and I've fixed all of them:

### **Issue 1: Environment Variables Not Passed Through** ✅
**Error**: `ValueError: API key required for provider 'kimi'. Set KIMI_API_KEY environment variable.`

**Root Cause**: MCP servers were spawned as subprocesses without inheriting environment variables.

**Fix** (in `agent.py` line 119):
```python
server_params = StdioServerParameters(
    command=sys.executable,
    args=[script_path],
    env=os.environ.copy()  # Pass through all environment variables
)
```

### **Issue 2: Async Event Loop Conflict** ✅
**Error**: `RuntimeError: asyncio.run() cannot be called from a running event loop`

**Root Cause**: The `example_with_mcp.py` runs in an async context (`asyncio.run(main())`), so calling `asyncio.run()` again inside tool execution fails.

**Fix** (in `agent.py` lines 685-697):
```python
# Check if there's already a running event loop
try:
    loop = asyncio.get_running_loop()
    # If in async context, run in separate thread with its own event loop
    with concurrent.futures.ThreadPoolExecutor() as executor:
        future = executor.submit(asyncio.run, self.mcp_manager.call_tool(...))
        result = future.result()
except RuntimeError:
    # No event loop running, safe to use asyncio.run()
    result = asyncio.run(self.mcp_manager.call_tool(...))
```

### **Issue 3: Pydantic v2 / LangChain Compatibility** ✅
**Error**: `` `ChatOpenAI` is not fully defined; you should define `BaseCache`, then call `ChatOpenAI.model_rebuild()`. ``

**Root Cause**: The `browser_tools.py` was trying to initialize `ChatOpenAI` during browser startup, which triggered Pydantic v2 validation errors.

**Fix** (in `browser_tools.py`):
- Removed unnecessary `ChatOpenAI` initialization from `init_browser()`
- ChatOpenAI is now initialized on-demand only in `browser_execute_task()` when actually needed
- Simple browser navigation (`browser_navigate`, `browser_get_content`) no longer requires OpenAI API key

### **Files Modified**:
1. `/Users/boj/ai-agent-book/projects/week4/agent-with-event-trigger/agent.py`
   - Added `env=os.environ.copy()` to pass environment variables
   - Added event loop detection and thread-based execution for MCP tools
   - Added `concurrent.futures` import

2. `/Users/boj/ai-agent-book/projects/week4/agent-with-event-trigger/MCP_INTEGRATION.md`
   - Documented environment variable pass-through
   - Documented event loop handling strategy

3. `/Users/boj/ai-agent-book/projects/week4/agent-with-event-trigger/README_MCP.md`
   - Updated troubleshooting section

4. `/Users/boj/ai-agent-book/projects/week4/collaboration-tools/src/browser_tools.py`
   - Removed premature ChatOpenAI initialization
   - Cleaned up unused `_browser_agent` variable

5. `/Users/boj/ai-agent-book/projects/week4/collaboration-tools/README.md`
   - Added troubleshooting section for LangChain/Pydantic issues

Now you should be able to run `python example_with_mcp.py` successfully and the browser navigation should work without errors!

---


*Exported from [Cursor View](https://github.com/saharmor/cursor-view)*