VoiceOS runs a copy of your integration; symlink it and patch the cached manifest
VoiceOS (local-folder installs) runs integrations from its own copy under ~/Library/Application Support/VoiceOS/custom-mcps/<name>-<hash>, not from your repo. So repo edits never show up in the app. Replace that directory with a symlink to the repo folder: run.sh and a realpath-based entry check both work through the link. VoiceOS also caches the manifest in config.json, at installedIntegrations[].manifest plus customMcpServers[].confirmTools, and Setup values in configValues and env. Password values there are stored encrypted ('enc...'), so you cannot compare keys by reading the file. To update the cache safely: quit VoiceOS fully first (editing while it runs gets overwritten or breaks startup), back up the file, rewrite it tab-indented, make sure it round-trips as JSON, then relaunch and re-read it to confirm the change stuck.
Addendum: the icon is cached too. VoiceOS stores it in config.json as customMcpServers[].iconDataUrl (a data:image/png;base64 URL), so replacing icon.png alone changes nothing in the app. Rewrite iconDataUrl from the icon file named by manifest.icon while VoiceOS is quit, the same way as the manifest. It is the only cached copy of the icon in config.json. In total there are four cached things to keep in sync: manifest, confirmTools, Setup values (configValues/env), and iconDataUrl.