Getting it into your agent
There is no command for this one: it runs only inside a plugin, and the catalogue could not identify which plugin ships it. The source is linked below.
Wrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/rules/swonvip/mcp-server-talk/mcp-troubleshooting-guide)<a href="https://agentmods.dev/rules/swonvip/mcp-server-talk/mcp-troubleshooting-guide"><img src="https://agentmods.dev/badge/rules/swonvip/mcp-server-talk/mcp-troubleshooting-guide.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00000 | $0.01025 |
| Opus 5 | $0.00000 | $0.00513 |
| Sonnet 5 | $0.00000 | $0.00205 |
| Haiku 4.5 | $0.00000 | $0.00103 |
Grade B, and why
mcp-troubleshooting-guide scanned grade B with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 6d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Reads MCP configurationmediumAgent snooping
mcp.json carries server URLs and auth tokens; reading it lets a mod discover and abuse other integrations.
cat /Users/sven.scheffel/.cursor/mcp.json How it starts
The opening of the file, as written. The whole thing — 163 lines — stays where its author put it; the contents beside it link to each section on GitHub.
MCP Server Troubleshooting Guide
Current Status Analysis
Based on your setup, I found:
✅ What's Working:
- FastMCP is installed (version 2.5.1)
- MCP server code imports successfully
- Configuration file exists at
/Users/sven.scheffel/.cursor/mcp.json - Server is properly configured with correct paths
❓ Potential Issues:
1. Cursor MCP Feature Availability
- MCP support in Cursor is still in beta/preview
- Ensure you have the latest version of Cursor
- Check if MCP features are enabled in your Cursor settings
2. Configuration Location
Your MCP config is at: /Users/sven.scheffel/.cursor/mcp.json
This should be the correct global location for Cursor.
3. Server Startup Issues
The server might not be starting properly when Cursor tries to connect.
Troubleshooting Steps
Step 1: Verify Cursor Version and MCP Support
- Check Cursor version: Help → About
- Look for MCP-related settings in Cursor preferences
- Ensure you're using Cursor Pro (MCP might require Pro subscription)
Step 2: Test Server Manually
cd /Users/sven.scheffel/Documents/repositories/mcp-server-talk/demo/1
python3 simple_mcp_server.py
The server should start and show available tools.
Step 3: Check Configuration Syntax
Your current config looks correct:
{
"mcpServers": {
"math-assistant": {
"command": "python3",
"args": [
"/Users/sven.scheffel/Documents/repositories/mcp-server-talk/demo/1/simple_mcp_server.py"
],
"cwd": "/Users/sven.scheffel/Documents/repositories/mcp-server-talk/demo/1"
}
}
}
Step 4: Restart Cursor
After configuration changes:
- Completely quit Cursor
- Restart Cursor
- Wait for MCP servers to initialize
Step 5: Check Cursor Logs
Look for MCP-related errors in Cursor's developer console:
- Help → Toggle Developer Tools
- Check Console tab for MCP errors
Step 6: Simplify Configuration
Try with minimal config first:
{
"mcpServers": {
"math-assistant": {
"command": "python3",
"args": ["/Users/sven.scheffel/Documents/repositories/mcp-server-talk/demo/1/simple_mcp_server.py"]
}
}
}
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 6d ago First seen · 163 lines · 0 tokens per session scan B 295ff886d1c9
mcp-troubleshooting-guide is a cursor rule published in the GitHub repository SwonVIP/mcp-server-talk (0 stars, last pushed 1y ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 1,025 tokens. A static security scan graded it B with 1 finding (reads mcp configuration). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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