strip-volatile

A pi.dev extension that strips volatile runtime data from settings.json on exit, preventing it from being persisted across sessions.

What it strips

By default, these keys are stripped:

| Key | Why it's volatile | |-----|-------------------| | defaultModel | Set whenever you change models — leaks the last model used | | defaultProvider | Set alongside defaultModel | | lastChangelogVersion | Written on every version bump to control changelog display |

Custom keys

You can configure which keys are stripped by adding a stripVolatileKeys array to your settings.json:

{
  "stripVolatileKeys": ["defaultModel", "defaultProvider", "lastChangelogVersion", "someOtherKey"]
}

When stripVolatileKeys is present and non-empty, only the keys listed in that array are stripped. The stripVolatileKeys setting itself is preserved so it can remain in settings.json as persistent configuration. If the array is missing or empty, the built-in defaults above are used. This means you can add or remove keys without any code changes.

Install

pi install git:github.com/mcowger/pi-strip-volatile

Or add to your settings.json:

{
  "packages": ["git:github.com/mcowger/pi-strip-volatile"]
}

How it works

The extension reads settings.json, removes the configured (or default) volatile keys, and writes the file back using the same lock strategy as Pi 0.80.6. It runs on session_start, agent_start, agent_end, and session_shutdown so volatile keys are cleaned up both during the session and on exit.

Respects PI_CODING_AGENT_DIR if set (with ~ expansion), otherwise defaults to ~/.pi/agent.

Requires Pi 0.80.6 or later.

Develop

bun install
bun run check       # lint + typecheck + test
pi -e .             # load extension locally

License

MIT