## What's Changed
* Code assist service metrics. by @gundermanc in https://github.com/google-gemini/gemini-cli/pull/15024
* chore/release: bump version to 0.21.0-nightly.20251216.bb0c0d8ee by @gemini-cli-robot in https://github.com/google-gemini/gemini-cli/pull/15121
* Docs by @Roaimkhan in https://github.com/google-gemini/gemini-cli/pull/15103
* Use official ACP SDK and support HTTP/SSE based MCP servers by @SteffenDE in https://github.com/google-gemini/gemini-cli/pull/13856
* Remove foreground for themes other than shades of purple and holiday. by @jacob314 in https://github.com/google-gemini/gemini-cli/pull/14606
* chore: remove repo specific tips by @jackwotherspoon in https://github.com/google-gemini/gemini-cli/pull/15164
* chore: remove user query from footer in debug mode by @jackwotherspoon in https://github.com/google-gemini/gemini-cli/pull/15169
* Disallow unnecessary awaits. by @gundermanc in https://github.com/google-gemini/gemini-cli/pull/15172
* Add one to the padding in settings dialog to avoid flicker. by @jacob314 in https://github.com/google-gemini/gemini-cli/pull/15173
* feat(core): introduce remote agent infrastructure and rename local executor by @adamfweidman in https://github.com/google-gemini/gemini-cli/pull/15110
* feat(cli): Add `/auth logout` command to clear credentials and auth state by @CN-Scars in https://github.com/google-gemini/gemini-cli/pull/13383
* (fix) Automated pr labeller by @DaanVersavel in https://github.com/google-gemini/gemini-cli/pull/14885
* feat: launch Gemini 3 Flash in Gemini CLI ⚡️⚡️⚡️ by @scidomino in https://github.com/google-gemini/gemini-cli/pull/15196
* Refactor: Migrate console.error in ripGrep.ts to debugLogger by @Adib234 in https://github.com/google-gemini/gemini-cli/pull/15201
* chore: update a2a-js to 0.3.7 by @adamfweidman in https://github.com/google-gemini/gemini-cli/pull/15197
* chore(core): remove redundant isModelAvailabilityServiceEnabled toggle and clean up dead code by @adamfweidman in https://github.com/google-gemini/gemini-cli/pull/15207
* feat(core): Late resolve `GenerateContentConfig`s and reduce mutation. by @joshualitt in https://github.com/google-gemini/gemini-cli/pull/14920
* Respect previewFeatures value from the remote flag if undefined by @sehoon38 in https://github.com/google-gemini/gemini-cli/pull/15214
* feat(ui): add Windows clipboard image support and Alt+V paste workaround by @jacob314 in https://github.com/google-gemini/gemini-cli/pull/15218
* chore(core): remove legacy fallback flags and migrate loop detection by @adamfweidman in https://github.com/google-gemini/gemini-cli/pull/15213
* fix(ui): Prevent eager slash command completion hiding sibling commands by @SandyTao520 in https://github.com/google-gemini/gemini-cli/pull/15224
* Docs: Update Changelog for Dec 17, 2025 by @jkcinouye in https://github.com/google-gemini/gemini-cli/pull/15204
* Code Assist backend telemetry for user accept/reject of suggestions by @gundermanc in https://github.com/google-gemini/gemini-cli/pull/15206
* fix(cli): correct initial history length handling for chat commands by @SandyTao520 in https://github.com/google-gemini/gemini-cli/pull/15223
* chore/release: bump version to 0.21.0-nightly.20251218.739c02bd6 by @gemini-cli-robot in https://github.com/google-gemini/gemini-cli/pull/15231
* Change detailed model stats to use a new shared Table class to resolve robustness issues. by @jacob314 in https://github.com/google-gemini/gemini-cli/pull/15208
* feat: add agent toml parser by @abhipatel12 in https://github.com/google-gemini/gemini-cli/pull/15112
* Add core tool that adds all context from the core package. by @jacob314 in https://github.com/google-gemini/gemini-cli/pull/15238
* (docs): Add reference section to hooks documentation by @abhipatel12 in https://github.com/google-gemini/gemini-cli/pull/15159
* feat(hooks): add support for friendly names and descriptions by @abhipatel12 in https://github.com/google-gemini/gemini-cli/pull/15174
* feat: Detect background color by @jacob314 in https://github.com/google-gemini/gemini-cli/pull/15132
* add 3.0 to allowed sensitive keywords by @scidomino in https://github.com/google-gemini/gemini-cli/pull/15276
* feat: Pass additional environment variables to shell execution by @galz10 in https://github.com/google-gemini/gemini-cli/pull/15160
* Remove unused code by @scidomino in https://github.com/google-gemini/gemini-cli/pull/15290
* Handle all 429 as retryableQuotaError by @sehoon38 in https://github.com/google-gemini/gemini-cli/pull/15288
* Remove unnecessary dependencies by @scidomino in https://github.com/google-gemini/gemini-cli/pull/15291
* fix: prevent infinite loop in prompt completion on error by @galz10 in https://github.com/google-gemini/gemini-cli/pull/14548
* fix(ui): show command suggestions even on perfect match and sort them by @SandyTao520 in https://github.com/google-gemini/gemini-cli/pull/15287
* feat(hooks): reduce log verbosity and improve error reporting in UI by @abhipatel12 in https://github.com/google-gemini/gemini-cli/pull/15297
* feat: simplify tool confirmation labels for better UX by @NTaylorMullen in https://github.com/google-gemini/gemini-cli/pull/15296
* chore/release: bump version to 0.21.0-nightly.20251219.70696e364 by @gemini-cli-robot in https://github.com/google-gemini/gemini-cli/pull/15301
* feat(core): Implement JIT context memory loading and UI sync by @SandyTao520 in https://github.com/google-gemini/gemini-cli/pull/14469
* feat(ui): Put "Allow for all future sessions" behind a setting off by default. by @jacob314 in https://github.com/google-gemini/gemini-cli/pull/15322
* fix(cli):change the placeholder of input during the shell mode by @JayadityaGit in https://github.com/google-gemini/gemini-cli/pull/15135
* Validate OAuth resource parameter matches MCP server URL by @galz10 in https://github.com/google-gemini/gemini-cli/pull/15289
* docs(cli): add System Prompt Override (GEMINI_SYSTEM_MD) by @ashmod in https://github.com/google-gemini/gemini-cli/pull/9515
* more robust command parsing logs by @scidomino in https://github.com/google-gemini/gemini-cli/pull/15339
* Introspection agent demo by @scidomino in https://github.com/google-gemini/gemini-cli/pull/15232
* fix(core): sanitize hook command expansion and prevent injection by @SandyTao520 in https://github.com/google-gemini/gemini-cli/pull/15343
* fix(folder trust): add validation for trusted folder level by @adamfweidman in https://github.com/google-gemini/gemini-cli/pull/12215
* fix(cli): fix right border overflow in trust dialogs by @galz10 in https://github.com/google-gemini/gemini-cli/pull/15350
* fix(policy): fix bug where accepting-edits continued after it was turned off by @jacob314 in https://github.com/google-gemini/gemini-cli/pull/15351
* fix: prevent infinite relaunch loop when --resume fails (#14941) by @Ying-xi in https://github.com/google-gemini/gemini-cli/pull/14951
* chore/release: bump version to 0.21.0-nightly.20251220.41a1a3eed by @gemini-cli-robot in https://github.com/google-gemini/gemini-cli/pull/15352
* feat(telemetry): add clearcut logging for hooks by @abhipatel12 in https://github.com/google-gemini/gemini-cli/pull/15405
* fix(core): Add `.geminiignore` support to SearchText tool by @xyrolle in https://github.com/google-gemini/gemini-cli/pull/13763
* fix(patch): cherry-pick 0843d9a to release/v0.23.0-preview.0-pr-15443 to patch version v0.23.0-preview.0 and create version 0.23.0-preview.1 by @gemini-cli-robot in https://github.com/google-gemini/gemini-cli/pull/15445
* fix(patch): cherry-pick 9cdb267 to release/v0.23.0-preview.1-pr-15494 to patch version v0.23.0-preview.1 and create version 0.23.0-preview.2 by @gemini-cli-robot in https://github.com/google-gemini/gemini-cli/pull/15592
* fix(patch): cherry-pick 37be162 to release/v0.23.0-preview.2-pr-15601 to patch version v0.23.0-preview.2 and create version 0.23.0-preview.3 by @gemini-cli-robot in https://github.com/google-gemini/gemini-cli/pull/15603
* fix(patch): cherry-pick 07e597d to release/v0.23.0-preview.3-pr-15684 [CONFLICTS] by @gemini-cli-robot in https://github.com/google-gemini/gemini-cli/pull/15734
* fix(patch): cherry-pick c31f053 to release/v0.23.0-preview.4-pr-16004 to patch version v0.23.0-preview.4 and create version 0.23.0-preview.5 by @gemini-cli-robot in https://github.com/google-gemini/gemini-cli/pull/16027
* fix(patch): cherry-pick 788bb04 to release/v0.23.0-preview.5-pr-15817 [CONFLICTS] by @gemini-cli-robot in https://github.com/google-gemini/gemini-cli/pull/16038
## New Contributors
* @Roaimkhan made their first contribution in https://github.com/google-gemini/gemini-cli/pull/15103
* @SteffenDE made their first contribution in https://github.com/google-gemini/gemini-cli/pull/13856
* @CN-Scars made their first contribution in https://github.com/google-gemini/gemini-cli/pull/13383
* @Ying-xi made their first contribution in https://github.com/google-gemini/gemini-cli/pull/14951
* @xyrolle made their first contribution in https://github.com/google-gemini/gemini-cli/pull/13763
**Full Changelog**: https://github.com/google-gemini/gemini-cli/compare/v0.22.5...v0.23.0