MCP server added to config file in the cli-agents path with .json extension using the .example template. Q launches fine but /mcp results in empty list.

### Checks

- [x] I have searched [github.com/aws/amazon-q-developer-cli/issues](https://github.com/aws/amazon-q-developer-cli/issues?q=) and there are no duplicates of my issue
- [x] I have run `q doctor` in the affected terminal session
- [x] I have run `q restart` and replicated the issue again

### Operating system

macOS 15.6.1 (24G90)

### Expected behaviour

list the added MCP server name

### Actual behaviour

MCP server added to config file in the cli-agents path with .json extension using the .example template. Q launches fine but /mcp results in empty list.

### Steps to reproduce

MCP server added to config file in the cli-agents path with .json extension using the .example template. Q launches fine but /mcp results in empty list.

### Environment

```yaml

[q-details]
version = "1.15.0"
hash = "eb8db5c635fc469f3bd94ead16bb4bfb32d7443b"
date = "2025-09-02T17:57:24.662205Z (1d ago)"
variant = "full"

[system-info]
os = "macOS 15.6.1 (24G90)"
chip = "Apple M4"
total-cores = 10
memory = "16.00 GB"

[environment]
cwd = "/Users/USER/.aws/amazonq/cli-agents"
cli-path = "/Users/USER/.aws/amazonq/cli-agents"
os = "Mac"
shell-path = "/bin/zsh"
shell-version = "5.9"
terminal = "macOS"
install-method = "unknown"

[env-vars]
PATH = "/usr/local/bin:/System/Cryptexes/App/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/local/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/appleinternal/bin:/Users/USER/.local/bin"
QTERM_SESSION_ID = "8c5c284e86534bb8b128555a5f77e49b"
Q_SET_PARENT_CHECK = "1"
Q_TERM = "1.15.0"
SHELL = "/bin/zsh"
TERM = "xterm-256color"
__CFBundleIdentifier = "com.apple.Terminal"
```

Ispeziona la configurazione .json di MCP nel percorso cli-agents e confrontala con il modello .example. Riproduci il problema con q doctor, q restart e il comando /mcp; è completato quando il nome del server MCP configurato appare nell’elenco /mcp.

Scritto dal modello di indicizzazione a partire dal testo della issue.