Module llm_backend 

LLM-based extraction backend (v1.0.75 — G21 + G23 solution)

Default extraction backend. Extracts entities and relationships by invoking an LLM CLI (claude code or codex CLI) in headless mode.

Structs

AutoFactory

Auto-detect factory — picks CodexFactory when codex is on PATH, ClaudeFactory when claude is on PATH, NullFactory when neither is reachable. This is the v1.0.81 behaviour (implicit preference for codex) made explicit.

ClaudeFactory

Claude CLI factory.

CodexFactory

Codex CLI factory — builds a LlmBackend configured for codex exec.

LlmBackend

LLM-based extraction backend.

LlmExtractorConfig

Configuration for the LLM extractor.

NullFactory

No-op factory — every extraction call returns empty output; every embed call returns an empty vector. Used by --llm-backend=none (zero-dependency mode).

Enums

LlmBackendKindFactory

LLM backend kind (mirrors cli::LlmBackendChoice).

Traits

LlmBackendFactory

Factory trait for LLM-based backends. Each implementation knows how to build the right CLI invocation (codex vs claude vs none) from the user-supplied LlmExtractorConfig.

Functions

detect_available_backend

Resolves the available LLM CLI by probing PATH for codex first, then claude. Returns None if neither is found.

factory_for_choice

Factory dispatcher — converts a CLI enum value into a boxed factory. This is the integration point used by composite_backend.rs and by the 6 commands that consume --llm-backend.