Changelog for v0.53.0-preview.0 (#28507)

Co-authored-by: gemini-cli-robot <224641728+gemini-cli-robot@users.noreply.github.com>

docs/changelogs/preview.md

@@ -1,6 +1,6 @@
-# Preview release: v0.51.0-preview.0
+# Preview release: v0.53.0-preview.0
 
-Released: July 8, 2026
+Released: July 22, 2026
 
 Our preview release includes the latest, new, and experimental features. This
 release may not be as stable as our [latest weekly release](latest.md).
@@ -13,53 +13,42 @@ npm install -g @google/gemini-cli@preview
 
 ## Highlights
 
-- **Caretaker Cloud Run Services**: Implemented a Cloud Run webhook ingestion
-  service and egress service skeleton to support advanced caretaker features.
-- **Enhanced Security & Sandbox Hardening**: Enforced a case-insensitive
-  sensitive path blocklist and VS Code human-in-the-loop (HITL) checks, resolved
-  a directory escape vulnerability in the memory import processor, and marked
-  `~/.gitconfig` as read-only within the macOS sandbox.
-- **Improved Thought Leakage and Escape Handling**: Resolved potential thought
-  leakage by stripping thinking/thought processes from scrubbed history turns,
-  and ensured escape sequences in string literals are correctly preserved for
-  modern models.
-- **Robust Path & API Updates**: Enhanced defensive path resolution for
-  at-reference files, and updated the Vertex AI base URL configuration to
-  support the latest API updates.
+- **Caretaker LLM Triage Orchestrator**: Implemented the LLM triage orchestrator
+  and container build configuration to support caretaker triage workflows.
+- **Enhanced Workspace Trust & Sandbox Hardening**: Aligned macOS permissive
+  Seatbelt profiles with the deny-default model and enforced workspace trust and
+  task isolation in the Agent-to-Agent (A2A) server to prevent remote code
+  execution (RCE).
+- **Core Robustness & API Protections**: Mitigated infinite ReAct and prompt
+  injection loops, and prevented 400 Bad Request errors by grouping cancelled
+  tool responses and coalescing consecutive roles.
+- **Robust Credentials & Fallbacks**: Restored the
+  `GOOGLE_APPLICATION_CREDENTIALS` environment variable fallback and
+  sequentially verified cached credentials.
+- **Evaluation Coverage Reporting**: Added a new command to generate
+  comprehensive eval coverage reports.
 
 ## What's Changed
 
-- Changelog for v0.50.0-preview.1 by @gemini-cli-robot in
-  [#28150](https://github.com/google-gemini/gemini-cli/pull/28150)
-- Fix no_proxy test by @jerrylin3321 in
-  [#28131](https://github.com/google-gemini/gemini-cli/pull/28131)
-- chore(release): bump version to 0.51.0-nightly.20260625.g3fbf93e26 by
-  @gemini-cli-robot in
-  [#28151](https://github.com/google-gemini/gemini-cli/pull/28151)
-- Vertex base url update by @DavidAPierce in
-  [#28145](https://github.com/google-gemini/gemini-cli/pull/28145)
-- fix(security): enforce case-insensitive sensitive path blocklist and vscode
-  hitl by @luisfelipe-alt in
-  [#27966](https://github.com/google-gemini/gemini-cli/pull/27966)
-- fix(core-tools): resolve defensive path resolution for at-reference files and
-  fix macOS tests by @luisfelipe-alt in
-  [#28053](https://github.com/google-gemini/gemini-cli/pull/28053)
-- feat(caretaker): implement Cloud Run webhook ingestion service by @chadd28 in
-  [#28015](https://github.com/google-gemini/gemini-cli/pull/28015)
-- fix(core): resolve symbolic link directory escape in memory import processor
-  by @luisfelipe-alt in
-  [#28233](https://github.com/google-gemini/gemini-cli/pull/28233)
-- feat(caretaker): egress cloud run service skeleton by @chadd28 in
-  [#28167](https://github.com/google-gemini/gemini-cli/pull/28167)
-- fix(sandbox): make ~/.gitconfig read-only in the macOS sandbox by
-  @ompatel-aiml in
-  [#28221](https://github.com/google-gemini/gemini-cli/pull/28221)
-- fix(core): preserve escape sequences in string literals for modern models by
+- fix(core,a2a): group cancelled tool responses and coalesce consecutive roles
+  to prevent 400 Bad Request by @luisfelipe-alt in
+  [#28407](https://github.com/google-gemini/gemini-cli/pull/28407)
+- feat(caretaker-triage): implement LLM triage orchestrator and container build
+  by @chadd28 in
+  [#28345](https://github.com/google-gemini/gemini-cli/pull/28345)
+- refactor(cli): align macOS permissive Seatbelt profiles with deny-default
+  model by @ompatel-aiml in
+  [#28424](https://github.com/google-gemini/gemini-cli/pull/28424)
+- fix(core): mitigate infinite ReAct loops and prompt injection loops by
+  @amelidev in [#28429](https://github.com/google-gemini/gemini-cli/pull/28429)
+- fix(a2a-server): enforce workspace trust and task isolation to prevent RCE by
   @luisfelipe-alt in
-  [#28299](https://github.com/google-gemini/gemini-cli/pull/28299)
-- fix(core): strip thoughts from scrubbed history turns and resolve thought
-  leakage by @amelidev in
-  [#27971](https://github.com/google-gemini/gemini-cli/pull/27971)
+  [#28470](https://github.com/google-gemini/gemini-cli/pull/28470)
+- fix(core): sequentially verify cached credentials and restore
+  GOOGLE_APPLICATION_CREDENTIALS fallback by @luisfelipe-alt in
+  [#28472](https://github.com/google-gemini/gemini-cli/pull/28472)
+- feat(evals): add eval coverage report command by @ved015 in
+  [#28169](https://github.com/google-gemini/gemini-cli/pull/28169)
 
 **Full Changelog**:
-https://github.com/google-gemini/gemini-cli/compare/v0.50.0-preview.1...v0.51.0-preview.0
+https://github.com/google-gemini/gemini-cli/compare/v0.52.0-preview.0...v0.53.0-preview.0