Evidence record / codex
A dated record of one change, kept so the writing that cites it can be checked. Compiled from the sources listed below by the research run, not written for reading. The judgment lives in the issues that cite it, below.
2026-10-24-codex-an-opt-in-native-tool-copies-files-between-environments-without-model-context
An opt-in native tool copies files between environments without model context. The host-registered multi_env_copy_file extension transfers bytes between selected environments without loading file contents into model context. It requires absolute endpoint-native paths and enforces each endpoint’s sandbox policy and grants. Failed writes can leave truncated or partial targets; it is not transactional.
Channel: tagged-release. Half: capability. Date: 2026-10-23.
Operator consequence: Test binary transfers, denied endpoint access and interruption before replacing model-mediated transfer scripts. The host must register the opt-in tool, and recovery must account for partial destinations.
Receipt
Finding metadata
Run: 2026-10-24-weekly-digest-2026-10-13_2026-10-24-frontier-v0
Finding ID: 2026-10-24-codex-an-opt-in-native-tool-copies-files-between-environments-without-model-context
Source links
Primary links, including exact changelog lines when available.
Versioned source: run artifact