claude-code - 💡(How to fix) Fix [BUG] [2.1.133] MCP tools not exposed to model + model misidentifies itself as not-Claude-Code

{                                                                                                                     
  "mcpServers": {                                                                                                     
    "lark-mcp": {
      "type": "stdio",
      "command": "/opt/homebrew/bin/lark-mcp",
      "args": ["mcp", "-a", "...", "-s", "...", "--oauth", "-t", "..."],
      "env": { "NODE_OPTIONS": "--use-bundled-ca" }                                                                   
    }
  }                                                                                                                   
}               

Steps to reproduce                                                                                                    
 
1. Run claude on 2.1.133. UI shows lark-mcp · ✔ connected · 22 tools.                                                 
2. Ask the model to call any mcp__lark* tool, or simply ask
"what MCP tools do you have?"                                                                                         
3. Model reports it has no MCP tools available; no mcp__* tools appear in
its tool list.                                                                                                        
                                                                                                                      
Expected                                                                                                              
                                                                                                                      
Tools from connected MCP servers are callable, as on 2.1.132.                                                         
 
Actual                                                                                                                
                
- Zero MCP tools visible to the model.                                                                                
- npm install -g @anthropic-ai/claude-code@2.1.132 → tools reappear with
the same untouched config.                                                                                            
- Reinstall 2.1.133 → tools disappear again. Deterministic.
                                                                                                                      
Bug 2: Model identity confusion                                                                                       
                                                                                                                      
In a 2.1.133 session, when asked why MCP tools weren't available, the model                                           
responded (paraphrased, full transcript available on request):
                                                                                                                      
▎ "You're looking at Claude Code's config (~/.claude.json). I am Claude                                               
▎  running in Anthropic, a different product — my MCP config lives at                                                 
▎  ~/.anthropic/anthropic/mcp_config.json. Want me to create that file and                                            
▎  copy the config over?"                                                                                             
                                                                                                                      
That path is not read by Claude Code. Following the model's advice would                                              
just create dead files. The model only conceded it was wrong after the user                                           
pushed back with the version banner.                                                                                  
                                                                                                                      
Possible causes:                                                                                                      
- System prompt regression in 2.1.133 that no longer asserts the model is                                             
running inside Claude Code.                                                                                           
- Interaction with Bug 1: the model sees no MCP tools, can't reconcile that
with the user's claim, and confabulates a plausible-sounding explanation.                                             
                                                                                                                      
Either way, this is high-impact: the model's confident wrong advice can lead                                          
users to pollute their filesystem or chase phantom config problems.                                                   
                                                                                                                      
Workaround                                                                                                            
                                                                                                                      
npm install -g @anthropic-ai/claude-code@2.1.132
export DISABLE_AUTOUPDATER=1   # or: claude config set -g autoUpdates false
                                                                                                                      
Additional info
                                                                                                                      
Happy to provide /mcp output, debug logs, or full session transcripts.   

### What Should Happen?

Tools from connected MCP servers are callable, as on 2.1.132.            


### Error Messages/Logs

```shell
▎ "You're looking at Claude Code's config (~/.claude.json). I am Claude                                               
▎  running in Anthropic, a different product — my MCP config lives at                                                 
▎  ~/.anthropic/anthropic/mcp_config.json. Want me to create that file and                                            
▎  copy the config over?"                                                                                             
                                                                                                                      
That path is not read by Claude Code. Following the model's advice would                                              
just create dead files. The model only conceded it was wrong after the user                                           
pushed back with the version banner.