gemini-cli/docs/changelogs/preview.md

Preview release: Release v0.22.0-preview.0

Released: December 16, 2025

Our preview release includes the latest, new, and experimental features. This release may not be as stable as our latest weekly release.

To install the preview release:

npm install -g @google/gemini-cli@preview

What's Changed

• feat(ide): fallback to GEMINI_CLI_IDE_AUTH_TOKEN env var by @skeshive in https://github.com/google-gemini/gemini-cli/pull/14843
• feat: display quota stats for unused models in /stats by @sehoon38 in https://github.com/google-gemini/gemini-cli/pull/14764
• feat: ensure codebase investigator uses preview model when main agent does by @abhipatel12 in https://github.com/google-gemini/gemini-cli/pull/14412
• chore: add closing reason to stale bug workflow by @galz10 in https://github.com/google-gemini/gemini-cli/pull/14861
• Send the model and CLI version with the user agent by @gundermanc in https://github.com/google-gemini/gemini-cli/pull/14865
• refactor(sessions): move session summary generation to startup by @jackwotherspoon in https://github.com/google-gemini/gemini-cli/pull/14691
• Limit search depth in path corrector by @scidomino in https://github.com/google-gemini/gemini-cli/pull/14869
• Fix: Correct typo in code comment by @kuishou68 in https://github.com/google-gemini/gemini-cli/pull/14671
• feat(core): Plumbing for late resolution of model configs. by @joshualitt in https://github.com/google-gemini/gemini-cli/pull/14597
• feat: attempt more error parsing by @adamfweidman in https://github.com/google-gemini/gemini-cli/pull/14899
• Add missing await. by @gundermanc in https://github.com/google-gemini/gemini-cli/pull/14910
• feat(core): Add support for transcript_path in hooks for git-ai/Gemini extension by @svarlamov in https://github.com/google-gemini/gemini-cli/pull/14663
• refactor: implement DelegateToAgentTool with discriminated union by @abhipatel12 in https://github.com/google-gemini/gemini-cli/pull/14769
• feat: reset availabilityService on /auth by @adamfweidman in https://github.com/google-gemini/gemini-cli/pull/14911
• chore/release: bump version to 0.21.0-nightly.20251211.8c83e1ea9 by @gemini-cli-robot in https://github.com/google-gemini/gemini-cli/pull/14924
• Fix: Correctly detect MCP tool errors by @kevin-ramdass in https://github.com/google-gemini/gemini-cli/pull/14937
• increase labeler timeout by @scidomino in https://github.com/google-gemini/gemini-cli/pull/14922
• tool(cli): tweak the frontend tool to be aware of more core files from the cli by @jacob314 in https://github.com/google-gemini/gemini-cli/pull/14962
• feat(cli): polish cached token stats and simplify stats display when quota is present. by @jacob314 in https://github.com/google-gemini/gemini-cli/pull/14961
• feat(settings-validation): add validation for settings schema by @lifefloating in https://github.com/google-gemini/gemini-cli/pull/12929
• fix(ide): Update IDE extension to write auth token in env var by @skeshive in https://github.com/google-gemini/gemini-cli/pull/14999
• Revert "chore(deps): bump express from 5.1.0 to 5.2.0" by @skeshive in https://github.com/google-gemini/gemini-cli/pull/14998
• feat(a2a): Introduce /init command for a2a server by @cocosheng-g in https://github.com/google-gemini/gemini-cli/pull/13419
• feat: support multi-file drag and drop of images by @jackwotherspoon in https://github.com/google-gemini/gemini-cli/pull/14832
• fix(policy): allow codebase_investigator by default in read-only policy by @abhipatel12 in https://github.com/google-gemini/gemini-cli/pull/15000
• refactor(ide ext): Update port file name + switch to 1-based index for characters + remove truncation text by @skeshive in https://github.com/google-gemini/gemini-cli/pull/10501
• fix(vscode-ide-companion): correct license generation for workspace dependencies by @skeshive in https://github.com/google-gemini/gemini-cli/pull/15004
• fix: temp fix for subagent invocation until subagent delegation is merged to stable by @abhipatel12 in https://github.com/google-gemini/gemini-cli/pull/15007
• test: update ide detection tests to make them more robust when run in an ide by @kevin-ramdass in https://github.com/google-gemini/gemini-cli/pull/15008
• Remove flex from stats display. See snapshots for diffs. by @jacob314 in https://github.com/google-gemini/gemini-cli/pull/14983
• Add license field into package.json by @jb-perez in https://github.com/google-gemini/gemini-cli/pull/14473
• feat: Persistent "Always Allow" policies with granular shell & MCP support by @allenhutchison in https://github.com/google-gemini/gemini-cli/pull/14737
• chore/release: bump version to 0.21.0-nightly.20251212.54de67536 by @gemini-cli-robot in https://github.com/google-gemini/gemini-cli/pull/14969
• fix(core): commandPrefix word boundary and compound command safety by @allenhutchison in https://github.com/google-gemini/gemini-cli/pull/15006
• chore(docs): add 'Maintainers only' label info to CONTRIBUTING.md by @jacob314 in https://github.com/google-gemini/gemini-cli/pull/14914
• Refresh hooks when refreshing extensions. by @scidomino in https://github.com/google-gemini/gemini-cli/pull/14918
• Add clarity to error messages by @gsehgal in https://github.com/google-gemini/gemini-cli/pull/14879
• chore : remove a redundant tip by @JayadityaGit in https://github.com/google-gemini/gemini-cli/pull/14947
• chore/release: bump version to 0.21.0-nightly.20251213.977248e09 by @gemini-cli-robot in https://github.com/google-gemini/gemini-cli/pull/15029
• Disallow redundant typecasts. by @gundermanc in https://github.com/google-gemini/gemini-cli/pull/15030
• fix(auth): prioritize GEMINI_API_KEY env var and skip unnecessary key… by @galz10 in https://github.com/google-gemini/gemini-cli/pull/14745
• fix: use zod for safety check result validation by @allenhutchison in https://github.com/google-gemini/gemini-cli/pull/15026
• update(telemetry): add hashed_extension_name to field to extension events by @kiranani in https://github.com/google-gemini/gemini-cli/pull/15025
• fix: similar to policy-engine, throw error in case of requiring tool execution confirmation for non-interactive mode by @MayV in https://github.com/google-gemini/gemini-cli/pull/14702
• Clean up processes in integration tests by @scidomino in https://github.com/google-gemini/gemini-cli/pull/15102
• docs: update policy engine getting started and defaults by @NTaylorMullen in https://github.com/google-gemini/gemini-cli/pull/15105
• Fix tool output fragmentation by encapsulating content in functionResponse by @abhipatel12 in https://github.com/google-gemini/gemini-cli/pull/13082
• Simplify method signature. by @scidomino in https://github.com/google-gemini/gemini-cli/pull/15114
• Show raw input token counts in json output. by @jacob314 in https://github.com/google-gemini/gemini-cli/pull/15021
• fix: Mark A2A requests as interactive by @MayV in https://github.com/google-gemini/gemini-cli/pull/15108
• use previewFeatures to determine which pro model to use for A2A by @sehoon38 in https://github.com/google-gemini/gemini-cli/pull/15131
• refactor(cli): fix settings merging so that settings using the new json format take priority over ones using the old format by @jacob314 in https://github.com/google-gemini/gemini-cli/pull/15116

Full Changelog: https://github.com/google-gemini/gemini-cli/compare/v0.21.0-preview.6...v0.22.0-preview.0