DX | 27-04-2026 | Release

.cursor/rules/README.md

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+# Cursor (optional)
+
+**Cursor** users: start at **[AGENTS.md](../../AGENTS.md)**. All conventions live in **`skills/*/SKILL.md`**.
+
+This folder only points contributors to **`AGENTS.md`** so editor-specific config does not duplicate the canonical docs.

AGENTS.md

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+# Contentstack .NET SDK – Agent guide
+
+**Universal entry point** for contributors and AI agents. Each skill is documented in **`skills/*/SKILL.md`** (YAML frontmatter for agent discovery where applicable).
+
+## What this repo is
+
+| Field | Detail |
+|-------|--------|
+| **Name:** | [contentstack-dotnet](https://github.com/contentstack/contentstack-dotnet) |
+| **Purpose:** | .NET SDK for Contentstack’s Content Delivery API (CDA)—fetch entries, assets, and run queries from .NET apps. |
+| **Out of scope (if any):** | Do not bypass the SDK HTTP layer with ad-hoc `HttpClient` usage; all requests go through `HttpRequestHandler` (see `skills/sdk-core-patterns/SKILL.md`). |
+
+## Tech stack (at a glance)
+
+| Area | Details |
+|------|---------|
+| Language | C#; multi-targeting includes `netstandard2.0`, `net47`, `net472` (see project files under `Contentstack.Core/`). |
+| Build | .NET SDK — solution [`Contentstack.Net.sln`](Contentstack.Net.sln); packages [`Contentstack.Core/`](Contentstack.Core/) (Delivery SDK), [`Contentstack.AspNetCore/`](Contentstack.AspNetCore/) (DI extensions). |
+| Tests | xUnit; unit tests in [`Contentstack.Core.Unit.Tests/`](Contentstack.Core.Unit.Tests/) (no credentials); integration tests in [`Contentstack.Core.Tests/`](Contentstack.Core.Tests/) (requires `app.config` / API credentials). |
+| Lint / coverage | No dedicated repo-wide lint/format CLI in CI. Security/static analysis: [CodeQL workflow](.github/workflows/codeql-analysis.yml). |
+| Other | JSON: Newtonsoft.Json; package version: single source in [`Directory.Build.props`](Directory.Build.props). |
+
+## Commands (quick reference)
+
+| Command type | Command |
+|--------------|---------|
+| Build | `dotnet build Contentstack.Net.sln` |
+| Test (unit) | `dotnet test Contentstack.Core.Unit.Tests/Contentstack.Core.Unit.Tests.csproj` |
+| Test (integration) | `dotnet test Contentstack.Core.Tests/Contentstack.Core.Tests.csproj` (configure credentials locally) |
+
+CI: [`.github/workflows/unit-test.yml`](.github/workflows/unit-test.yml) restores, builds, and runs unit tests on Windows (.NET 7). Other workflows include [NuGet publish](.github/workflows/nuget-publish.yml), [branch checks](.github/workflows/check-branch.yml), [CodeQL](.github/workflows/codeql-analysis.yml), policy/SCA scans.
+
+## Where the documentation lives: skills
+
+| Skill | Path | What it covers |
+|-------|------|----------------|
+| Dev workflow | [`skills/dev-workflow/SKILL.md`](skills/dev-workflow/SKILL.md) | Solution layout, build/test commands, versioning, CI entry points. |
+| SDK core patterns | [`skills/sdk-core-patterns/SKILL.md`](skills/sdk-core-patterns/SKILL.md) | Architecture, `ContentstackClient`, HTTP layer, DI, plugins. |
+| Query building | [`skills/query-building/SKILL.md`](skills/query-building/SKILL.md) | Fluent query API, operators, pagination, sync, taxonomy. |
+| Models and serialization | [`skills/models-and-serialization/SKILL.md`](skills/models-and-serialization/SKILL.md) | Entry/Asset models, JSON converters, collections. |
+| Error handling | [`skills/error-handling/SKILL.md`](skills/error-handling/SKILL.md) | Exception hierarchy, `ErrorMessages`, API error parsing. |
+| Testing | [`skills/testing/SKILL.md`](skills/testing/SKILL.md) | Unit vs integration tests, AutoFixture, `IntegrationTestBase`. |
+| Code review | [`skills/code-review/SKILL.md`](skills/code-review/SKILL.md) | PR checklist for this SDK. |
+
+An index with “when to use” hints is in [`skills/README.md`](skills/README.md).
+
+## Using Cursor (optional)
+
+If you use **Cursor**, [`.cursor/rules/README.md`](.cursor/rules/README.md) only points to **`AGENTS.md`**—the same conventions as for everyone else. Canonical guidance remains in **`skills/*/SKILL.md`**.

CHANGELOG.md

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+### Version: 2.27.0
+#### Date: Apr-23-2026
+
+##### Feat:
+- Timeline Preview Support
+  - Added `ReleaseId` and `PreviewTimestamp` properties to `LivePreviewConfig` for temporal content queries
+  - Enhanced `LivePreviewQueryAsync()` to support `preview_timestamp` and `release_id` parameters
+  - Implemented Timeline Preview API headers (`preview_timestamp`, `release_id`) in preview requests
+  - Added intelligent cache fingerprinting system to prevent stale timeline data
+  - New `IsCachedPreviewForCurrentQuery()` method for Timeline-aware cache validation
+  - Fork isolation now maintains independent Timeline contexts for concurrent operations
+  - Timeline Preview works seamlessly with complex nested content types and group fields
+- Integration Test Coverage Enhancement  
+  - Added comprehensive Timeline Preview integration test suites (70+ test cases)
+  - New test categories: `TimelinePreviewApiTests`, `TimelineAuthenticationTests`, `TimelineCacheValidationTests`
+  - Enhanced performance testing with Timeline-specific benchmarking
+  - Added authentication flow validation for Management Token vs Preview Token scenarios
+  - Comprehensive error handling tests for Timeline Preview edge cases
+
+
 ### Version: 2.26.0
 #### Date: Feb-10-2026