## What's Changed
* 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
* 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
## 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
**Full Changelog**: https://github.com/google-gemini/gemini-cli/compare/v0.21.0-nightly.20251216.bb0c0d8ee...v0.21.0-nightly.20251217.db643e916