Features
Fable5-structured reasoning pipeline
Automated query decomposition
Benchmark suite for quality-cost tradeoff measurement
Cost-optimization modeling per task type (COST.md)
Custom hooks for preprocessing and validation
Output style templates for consistent formatting
Routing guides for code vs. writing tasks
Blind-test parity validation scripts
Self-hosted operational model (no external API dependency)
AGPL-3.0 open-source license
Plugin system for Claude Code
Skill-based session mode (SKILL.md trigger)
Markdown-based configuration
Voice/voice conversation: not supported
Define typed agents with instructions, models, and tools in one file
Graph-based workflow engine with .then(), .branch(), .parallel()
Durable execution via Temporal for fault-tolerant agents
Human-in-the-loop workflow suspension and tool approval
Built-in observability: evals, metrics, traces, logs
Memory system with conversation history, working, and semantic memory
AI Gateway with response caching and 90+ provider support
Agent Client Protocol (ACP) for agent-to-agent delegation
Agent-to-Agent (A2A) communication across frameworks
Durable Agents with cacheable resumable streams
Task lists for long-running complex work
Inbox with priority notifications from external sources
Built-in event system with Redis Streams and Google Cloud Pub/Sub
Realtime voice integration with Inworld
MCP server authoring support
