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fix: prevent repeating interrupted turns (#9043)

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## What
Record a model-visible `<turn_aborted>` marker in history when a turn is
interrupted, and treat it as a session prefix.

## Why
When a turn is interrupted, Codex emits `TurnAborted` but previously did
not persist anything model-visible in the conversation history. On the
next user turn, the model can’t tell the previous work was aborted and
may resume/repeat earlier actions (including duplicated side effects
like re-opening PRs).

Fixes: https://github.com/openai/codex/issues/9042

## How
On `TurnAbortReason::Interrupted`, append a hidden user message
containing a `<turn_aborted>…</turn_aborted>` marker and flush.
Treat `<turn_aborted>` like `<environment_context>` for session-prefix
filtering.
Add a regression test to ensure follow-up turns don’t repeat side
effects from an aborted turn.

## Testing
`just fmt`
`just fix -p codex-core`
`cargo test -p codex-core -- --test-threads=1`
`cargo test --all-features -- --test-threads=1`

---------

Co-authored-by: Skylar Graika <sgraika127@gmail.com>
Co-authored-by: jif-oai <jif@openai.com>
Co-authored-by: Eric Traut <etraut@openai.com>
This commit is contained in:
Skylar Graika
2026-01-20 13:07:28 -08:00
committed by GitHub
parent 79c5bf9835
commit b236f1c95d
8 changed files with 239 additions and 40 deletions
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15
codex-rs/core/src/session_prefix.rs Normal file
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/// Helpers for identifying model-visible "session prefix" messages.
///
/// A session prefix is a user-role message that carries configuration or state needed by
/// follow-up turns (e.g. `<environment_context>`, `<turn_aborted>`). These items are persisted in
/// history so the model can see them, but they are not user intent and must not create user-turn
/// boundaries.
pub(crate) const ENVIRONMENT_CONTEXT_OPEN_TAG: &str = "<environment_context>";
pub(crate) const TURN_ABORTED_OPEN_TAG: &str = "<turn_aborted>";
/// Returns true if `text` starts with a session prefix marker (case-insensitive).
pub(crate) fn is_session_prefix(text: &str) -> bool {
let trimmed = text.trim_start();
let lowered = trimmed.to_ascii_lowercase();
lowered.starts_with(ENVIRONMENT_CONTEXT_OPEN_TAG) || lowered.starts_with(TURN_ABORTED_OPEN_TAG)
}