Release Notes

Version 2.0.0 (2026-08)

🎯 The Rewrite

HNO 2.0 is a ground-up rewrite of the framework: Go-native, type-safe, and architected around a shared orchestration kernel. It is not an incremental release — every layer was redesigned.

✨ Highlights

• Shared orchestration kernel (run.Loop): agents, teams and workflows run on one loop engine. New orchestrators (supervisors, routers, consensus drivers) compose in tens of lines.
• One abstraction, 17 providers: ten OpenAI-compatible providers share a single OpenAICompat adapter (thin shells, ~40 lines each); Anthropic and Gemini implement native protocols against the same Model interface.
• Type-safe workflows: GenericStep[In, Out] with compile-time input and output types (aligned with Genkit Flow[In,Out]).
• Team as composition: four collaboration strategies (sequential, parallel, leader-follower, consensus) are pluggable Scheduler implementations on the shared kernel.
• Function call dispatch optimized: O(1) merged tool index, concurrent tool execution with deterministic ordering, required-parameter validation, execute_tool OTel spans.
• Agent Skills: progressive disclosure (catalog injection → use_skill tool → on-demand references), aligned with the open Agent Skills standard.
• First-class MCP: MCP server tools bridge into standard toolkits with server-name prefixes and schema mapping.
• Observability built in: OTel GenAI semantic spans (no-op by default), cost estimation, retries, rate limiting, circuit breakers.
• Operations dashboard: /ops/ui shows runtime status, skill catalog and eval runs with live refresh.
• Windows parity: chroma-go v2 migration removes cgo; the entire test suite (79 packages) passes on Windows with zero failures.

🔧 Platform Fixes

• chromadb upgraded to v0.4.1 (pure Go, no cgo) with a full v2 API rewrite.
• Path validator handles Windows drive paths and forward-slash relative paths correctly; injection protection preserved for bare commands.
• Workflow timestamps are monotonic (CompletedAt strictly after StartedAt); memory storage evicts by insertion order (deterministic FIFO).
• External-network tests replaced with local HTTP servers (no flaky CI).

💥 Breaking Changes

• Package path renamed: pkg/agno → pkg/hno; AgnoError → HnoError.
• Memory.Add uses variadic user IDs; Memory.Size added.
• Team and Workflow execution internals moved to the shared kernel — custom orchestration should implement the run.Unit interface.