.NET SDK

Updated LaunchDarkly.EventSource to 5.3.1, which provides Authenticode-signed assemblies.

Updated the LaunchDarkly.EventSource dependency to 5.3.1, which includes Authenticode-signed assemblies.

The AI SDK now supports AgentGraph and adds template config methods for configuring AI features.

Enabled per-context summary events.

Added AgentConfig, AgentConfigs, and JudgeConfig methods to ILdAiClient. Tools property is now exposed on LdAiCompletionConfig. Added TrackDurationOf, TrackMetricsOf, TrackJudgeResult, and TrackToolCall. Silently overrides 'ldctx' in user-supplied template variables.

Major API reorganization moves shared types into LdAiConfigTypes, splits LdAiConfig into LdAiCompletionConfig and LdAiCompletionConfigDefault, and makes LdAiConfigTracker SDK-constructed only. Metric tracking now enforces at-most-once semantics per tracker, and completion config defaults to enabled per AISDK spec. Cross-process tracker reconstruction via ResumptionToken and per-execution runId for billing isolation are also added.

The persistent-store cache is now dropped after the FDv2 in-memory store initializes, reducing memory overhead for deployments using persistent stores.

Plugins can now be registered dynamically at runtime.

Added X-LaunchDarkly-Instance-Id header to requests.

Documentation files are now excluded from NuGet package builds.

Documentation files are now excluded from NuGet package builds.

Documentation files are now excluded from NuGet package builds.

Documentation files are no longer included in NuGet package builds.

Documentation files are now excluded from NuGet package builds.

Fixed FDv2 polling selector to use basis query parameter correctly, and excluded documentation files from NuGet package builds.

Documentation files are now excluded from NuGet package builds.

Fixed a crash when MAUI is unavailable in non-MAUI Windows applications.

Added support for System.Diagnostics.DiagnosticSource version 10.*

Fixed the FDv2 initializer to honor the x-ld-fd-fallback header during the initialization phase and on successful responses.

8.12.0 (2026-04-16)