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Expose functions as HTTP endpoints.

Distributed key-value state management with reactive change triggers.

Async job processing with named queues, retries, and dead-letter support.

Build durable streams for real-time data subscriptions.

Topic-based publish/subscribe messaging for real-time event distribution.

Schedule functions with cron expressions.

OpenTelemetry-based traces, metrics, logs, alerts, and sampling.

Spawn ephemeral microVMs and expose 14 sandbox::* triggers (lifecycle + filesystem) for isolated command execution and file ops.

Engine introspection (functions / triggers / workers), workers registry proxy, and filesystem-backed skill + prompt reader.

Register, store, and watch typed configuration values for the engine.

III Language Server — autocompletion and hover for III engine functions and triggers

One front door + provider protocol in front of every LLM provider.

Talk to PostgreSQL, MySQL, and SQLite from iii — query, execute, transactions, prepared statements, and change feeds.

Thin durable turn loop that wires session-manager, context-manager, and llm-router into an agent loop; spawns sub-agents as child sessions.

Unix shell + filesystem worker — exec with denylist/timeout/output caps and background jobs; fs::ls|stat|mkdir|rm|chmod|mv|grep|sed|read|write with host jail, denylist, size caps, and sandbox-target forwarding

Durable, reactive, branching store of typed conversation entries with six emitted trigger types.

OpenAI Responses provider worker with Chat Completions compatibility; implements provider::openai::stream and provider::openai::refresh_models behind llm-router.

Turns a raw conversation history plus a target model into a model-ready context — token counting, function-result pruning, and history compaction.

Anthropic Messages API provider worker; implements provider::anthropic::stream and provider::anthropic::refresh_models behind llm-router.

Web console for iii — bundles the React UI and proxies the engine WebSocket on a single port.