## What changed
- Add hidden app-server options `--plugin-mcp-launch-cwd` and `--mcp-launch-cwd` for host-supplied local stdio server launch directories without writing them to shared configuration.
- Apply these directories when both `mcp_shared_repl_cwd` and `mcp_connection_sharing` are enabled. For configured servers, require a matching executable and preserve any explicit working directory.
- Attach thread-specific sandbox state to direct MCP tool calls for servers advertising support, stripping caller-supplied sandbox and launcher metadata first.
## Testing
Add regression tests for launch-directory feature toggling and executable matching, and for direct MCP calls using each thread's sandbox working directory despite forged caller metadata.
GitOrigin-RevId: d7f78ea92163ec0ee9311f68ef17e87a6694b13b