---
agentTools:
  projectIndex: https://docs.arthur.ai/llms.txt
---

# May 2026 Release Notes

## Arthur Platform

### Governance & Policy Management

* **Comprehensive policy lifecycle management.** Organizations can create, update, and delete policies with inline alert and attestation rules, full API support, and SpiceDB authorization.
* **Bulk workspace compliance checks.** Trigger compliance evaluations across all policy-model pairs in a workspace with a single API call and per-assignment job tracking.
* **Policy assignment enforcement.** Automatically materialize alert rules on target models with dual permission checks and cascade deletion protection.
* **Configurable compliance time windows.** Users can select from six relative presets or define custom start dates when running policy checks, replacing hardcoded 30-day windows.
* **Workspace compliance overview.** Flat, queryable table showing per-rule and per-model compliance status with filtering, sorting, and summary rollup counts.
* **Three new governance roles.** Organization Governance Admin, Organization Policy Reader, and Workspace Policy Manager enable fine-grained delegation of governance responsibilities.

### Agent Discovery & Management

* **Agent scanning and registration.** Automatically discover agents within workspaces with GCP agent metadata tracking and system project creation.
* **Mute and unmute unregistered agents.** Configure durations from 7-365 days with dedicated tabs for discovered and muted agents.
* **Agent observability metrics.** Track agent span counts, tool count metrics, and tool call latencies for comprehensive agentic workflow monitoring.
* **Agent registration workflow.** Register discovered agents with complete GCP provider metadata through the governance interface.

### Dashboard & Analytics

* **Workspace and project-level dashboards.** Complement existing model-level analytics with date range selectors and custom filtering capabilities.
* **Custom metrics management.** Create, read, update, and soft delete custom aggregations with workspace-scoped management and testing capabilities.
* **Policy dashboard integration.** Analytics views scoped to individual policies with exportable data and visualization.
* **Chart library access.** Browse and select from curated published charts when creating custom dashboards.

### Data Connectors & Datasets

* **Azure Blob Storage connector.** Full support for Azure Blob Storage containers as data sources with comprehensive authentication options.
* **Expanded connector support.** New Databricks, ODBC, Snowflake, BigQuery, S3, and GCS connectors with native authentication and schema inference.
* **Multiple datasets per model.** Associate models with multiple data sources and perform cross-dataset aggregation matching.
* **Static dataset support.** Handle datasets without time columns for non-temporal data analysis.

### Security & Access Control

* **OIDC authentication.** Replace access key-based authentication across all deployment environments with modern identity provider integration.
* **IDP-managed group membership.** Synchronize group access via identity provider token claims instead of manual provisioning.
* **Audit logging system.** Comprehensive API request tracking with CloudWatch forwarding and 365-day retention.
* **User invitation workflow.** Email-based account creation with multi-group assignment and pending invitation management.

### Infrastructure & Deployment

* **High availability database clusters.** Patroni-based PostgreSQL and TimescaleDB HA with automatic failover and streaming replication.
* **OpenShift deployment support.** Standardized Helm charts with proper fsGroup configuration and audit log PVC support.
* **LTS build pipelines.** Independent publishing workflows for long-term support versions including arthur-client PyPI and Helm charts.
* **CloudWatch monitoring dashboards.** Track platform health metrics including response codes, latency, and running task counts.

### Bug Fixes

* Fixed user authentication queries running unnecessarily on every request, reducing database load.
* Resolved timezone handling issues in upsolve exports that were breaking timestamp-based filtering.
* Optimized job dequeue polling from 225ms to 0.008ms with partial indexing on active jobs.
* Fixed header validation behavior in FastAPI to properly reject underscore headers by default.

***

## Arthur Engine & Toolkit

### Deployment & Infrastructure

* **Airgapped deployment support.** Pre-cached tiktoken encodings eliminate external network calls during container initialization in network-restricted environments.
* **Non-root container execution.** Docker configurations support running as non-root users across ECS, GCP, and Kubernetes deployments.
* **Unified model upload pipeline.** Consolidated codebase supporting S3, filesystem/PVC, and GCS backends with consistent configuration.
* **Azure OpenAI provider support.** Full LiteLLM integration with API key, endpoint URL, and optional API version configuration.

### Onboarding & User Experience

* **Interactive onboarding CLI agent.** Automates setup of observability, model configuration, and Python instrumentation with guided validation paths.
* **Arthur-onboard Claude Code skill.** Streamlined engine installation and code instrumentation through guided prompts on macOS and Windows.
* **Multistep onboarding tour.** Walks first-time users through essential platform features with contextual tooltips and progress tracking.

### Observability & Instrumentation

* **Expanded framework instrumentors.** Added support for agentminds, baml, and codex instrumentors as optional extras in the Arthur SDK.
* **Stateless validation endpoint.** Run Arthur's built-in guardrail checks against arbitrary prompt/response pairs without persistent setup.
* **Improved PII detection accuracy.** Reduced PERSON entity false-positive rate from 17.9% to 0% by filtering digit-containing detections.

### Transform Management

* **Transform version history.** Complete version tracking with author and timestamp information for each configuration change.
* **One-click restore capability.** Revert transforms to any earlier version without data loss through a confirmation dialog.
* **Edit history panel.** Read-only snapshot viewer for previewing previous transform configurations.

### Multi-Tenancy & Access Control

* **Organization-scoped data isolation.** Database-level tenant isolation with automatic migration of existing data to default organization.
* **API key organization scoping.** Distinguish admin cross-org keys from tenant-scoped keys for proper access control.
* **Route-level enforcement.** Comprehensive org scope filtering across 193 OpenAPI operations preventing cross-organization resource access.

### Bug Fixes

* Fixed subagent span hierarchy to correctly nest under parent AGENT spans in distributed traces.
* Resolved race conditions in UserPromptSubmit that could overwrite trace context.
* Restored missing definition field on TraceTransformResponse for backward compatibility.
* Fixed model image bootstrap jobs to succeed on first run without latest-dev tag dependencies.