Module runtime 

Long-lived Python REPL runtime.

One python3 -u subprocess lives for the duration of an RLM turn (or an inline repl block sequence in the agent loop). Code blocks are sent over stdin framed by __RLM_RUN__/__RLM_END__ sentinels; the bootstrap exec()s them into the same global namespace so variables, imports, and even open file handles persist naturally across rounds.

Sub-LLM helpers (llm_query, llm_query_batched, rlm_query, rlm_query_batched) are wired through a stdin/stdout RPC protocol: Python emits __RLM_REQ_<sid>__::{json} on stdout, Rust dispatches the request and writes __RLM_RESP_<sid>__::{json} back on stdin. No HTTP sidecar, no temp ports — the same pipes carry both control and data.

The session id (<sid>) is a UUID generated per spawn, so user output that happens to contain “REQ” or “FINAL” can’t be confused with control messages.

Structs

BatchResp

PythonRuntime

Long-lived Python REPL.

ReplRound

Result of executing one code block.

SingleResp

Enums

RpcRequest

One RPC request emitted by Python during a round.

RpcResponse

Response for one RPC request.

Traits

RpcDispatcher

Trait-object handle for dispatching Python RPCs back into Rust.