### Breaking Changes
- `ModelRegistry.getApiKey(model)` has been replaced by `getApiKeyAndHeaders(model)` because `models.json` auth and header values can now resolve dynamically on every request. Extensions and SDK integrations that previously fetched only an API key must now fetch request auth per call and forward both `apiKey` and `headers`. Use `getApiKeyForProvider(provider)` only when you explicitly want provider-level API key lookup without model headers or `authHeader` handling ([#1835](https://github.com/badlogic/pi-mono/issues/1835))
- Removed deprecated direct `minimax` and `minimax-cn` model IDs, keeping only `MiniMax-M2.7` and `MiniMax-M2.7-highspeed`. Update pinned model IDs to one of those supported direct MiniMax models, or use another provider route that still exposes the older IDs ([#2596](https://github.com/badlogic/pi-mono/pull/2596) by [@liyuan97](https://github.com/liyuan97))
#### Migration Notes
Before:
```ts
const apiKey = await ctx.modelRegistry.getApiKey(model);
return streamSimple(model, messages, { apiKey });
```
After:
```ts
const auth = await ctx.modelRegistry.getApiKeyAndHeaders(model);
if (!auth.ok) throw new Error(auth.error);
return streamSimple(model, messages, {
apiKey: auth.apiKey,
headers: auth.headers,
});
```
### Added
- Added `sessionDir` setting support in global and project `settings.json` so session storage can be configured without passing `--session-dir` on every invocation ([#2598](https://github.com/badlogic/pi-mono/pull/2598) by [@smcllns](https://github.com/smcllns))
- Added a startup onboarding hint in the interactive header telling users pi can explain its own features and documentation ([#2620](https://github.com/badlogic/pi-mono/pull/2620) by [@ferologics](https://github.com/ferologics))
- Added `edit` tool multi-edit support so one call can update multiple separate, disjoint regions in the same file while matching all replacements against the original file content
- Added support for `PI_TUI_WRITE_LOG` directory paths, creating a unique log file (`tui-<timestamp>-<pid>.log`) per instance for easier debugging of multiple pi sessions ([#2508](https://github.com/badlogic/pi-mono/pull/2508) by [@mrexodia](https://github.com/mrexodia))
### Changed
### Fixed
- Fixed file mutation queue ordering so concurrent `edit` and `write` operations targeting the same file stay serialized in request order instead of being reordered during queue-key resolution
- Fixed `models.json` shell-command auth and headers to resolve at request time instead of being cached into long-lived model state. pi now leaves TTL, caching, and recovery policy to user-provided wrapper commands because arbitrary shell commands need provider-specific strategies ([#1835](https://github.com/badlogic/pi-mono/issues/1835))
- Fixed Google and Vertex cost calculation to subtract cached prompt tokens from billable input tokens instead of double-counting them when providers report `cachedContentTokenCount` ([#2588](https://github.com/badlogic/pi-mono/pull/2588) by [@sparkleMing](https://github.com/sparkleMing))
- Added missing `ajv` direct dependency; previously relied on transitive install via `@mariozechner/pi-ai` which broke standalone installs ([#2252](https://github.com/badlogic/pi-mono/issues/2252))
- Fixed `/export` HTML backgrounds to honor `theme.export.pageBg`, `cardBg`, and `infoBg` instead of always deriving them from `userMessageBg` ([#2565](https://github.com/badlogic/pi-mono/issues/2565))
- Fixed interactive bash execution collapsed previews to recompute visual line wrapping at render time, so previews respect the current terminal width after resizes and split-pane width changes ([#2569](https://github.com/badlogic/pi-mono/issues/2569))
- Fixed RPC `get_session_stats` to expose `contextUsage`, so headless clients can read actual current context-window usage instead of deriving it from token totals ([#2550](https://github.com/badlogic/pi-mono/issues/2550))
- Fixed `pi update` for git packages to fetch only the tracked target branch with `--no-tags`, reducing unrelated branch and tag noise while preserving force-push-safe updates ([#2548](https://github.com/badlogic/pi-mono/issues/2548))
- Fixed print and JSON modes to emit `session_shutdown` before exit, so extensions can release long-lived resources and non-interactive runs terminate cleanly ([#2576](https://github.com/badlogic/pi-mono/issues/2576))
- Fixed GitHub Copilot OpenAI Responses requests to omit the `reasoning` field entirely when no reasoning effort is requested, avoiding `400` errors from Copilot `gpt-5-mini` rejecting `reasoning: { effort: "none" }` during internal summary calls ([#2567](https://github.com/badlogic/pi-mono/issues/2567))
- Fixed blockquote text color breaking after inline links (and other inline elements) due to missing style restoration prefix
- Fixed slash-command Tab completion from immediately chaining into argument autocomplete after completing the command name, restoring flows like `/model` that submit into a selector dialog ([#2577](https://github.com/badlogic/pi-mono/issues/2577))
- Fixed stale content and incorrect viewport tracking after TUI content shrinks or transient components inflate the working area ([#2126](https://github.com/badlogic/pi-mono/pull/2126) by [@Perlence](https://github.com/Perlence))
- Fixed `@` autocomplete to debounce editor-triggered searches, cancel in-flight `fd` lookups cleanly, and keep suggestions visible while results refresh ([#1278](https://github.com/badlogic/pi-mono/issues/1278))