backend/

Package cost holds the per-model token-pricing table used to annotate generation outputs with `_tokens` / `_model` / `_cost_usd`.

Package delegate provides the Backend interface and types for executing agent/judge nodes via pluggable backends (CLI agents like claude-code/codex, or API-based backends like claw).

Package llmtypes defines iterion-owned types for the LLM generation layer.

Package model provides the ModelRegistry and claw-based NodeExecutor for resolving "provider/model-id" specs and executing LLM nodes.

Package recipe defines the RecipeSpec model and loading/application logic.

Package tool provides a unified ToolRegistry that normalizes built-in tools and MCP server tools under a single namespace and resolution scheme.