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feat(app-server): always return limited thread history (#20682)

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## Why

Whenever we return a thread's history (turns and items) over app-server,
always return the limited form as specified by the rollout policy
`EventPersistenceMode::Limited`, even if the thread was previously
started with `EventPersistenceMode::Extended`.

We're finding it is quite unscalable to be returning the extended
history, so let's apply the same filtering logic of the rollout policy
when we load and return the thread's history.

## What Changed

- Reuse the rollout persistence policy when reconstructing app-server
`ThreadItem` history so only `EventPersistenceMode::Limited` rollout
items are replayed into API turns.
- Route `thread/read`, `thread/resume`, `thread/fork`,
`thread/turns/list`, and rollback responses through the same filtered
app-server history projection.
- Keep live active turns intact when composing a response for a
currently running thread.
- Update command execution coverage so persisted extended command events
are excluded from returned history for `thread/read`, `thread/fork`, and
`thread/turns/list`.

## Test Plan

- `cargo test -p codex-app-server limited`
- `cargo test -p codex-app-server thread_shell_command`
- `cargo test -p codex-app-server thread_read`
- `cargo test -p codex-app-server thread_rollback`
- `cargo test -p codex-app-server thread_fork`
- `cargo test -p codex-app-server-protocol`
This commit is contained in:
Owen Lin
2026-05-04 10:37:35 -07:00
committed by GitHub
Unverified
parent 1b900bee8a
commit 541e99cf09
10 changed files with 102 additions and 100 deletions
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codex-rs/app-server-protocol/src/protocol/v2.rs
+9 -6
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@@ -3631,8 +3631,9 @@ pub struct ThreadStartParams {
#[experimental("thread/start.experimentalRawEvents")]
#[serde(default)]
pub experimental_raw_events: bool,
/// If true, persist additional rollout EventMsg variants required to
/// reconstruct a richer thread history on resume/fork/read.
/// If true, persist additional EventMsg variants to the rollout file.
/// However, `thread/read`, `thread/resume`, and `thread/fork` still only
/// return the limited form of thread history for scalability reasons.
#[experimental("thread/start.persistFullHistory")]
#[serde(default)]
pub persist_extended_history: bool,
@@ -3762,8 +3763,9 @@ pub struct ThreadResumeParams {
#[experimental("thread/resume.excludeTurns")]
#[serde(default, skip_serializing_if = "std::ops::Not::not")]
pub exclude_turns: bool,
/// If true, persist additional rollout EventMsg variants required to
/// reconstruct a richer thread history on subsequent resume/fork/read.
/// If true, persist additional EventMsg variants to the rollout file.
/// However, `thread/read`, `thread/resume`, and `thread/fork` still only
/// return the limited form of thread history for scalability reasons.
#[experimental("thread/resume.persistFullHistory")]
#[serde(default)]
pub persist_extended_history: bool,
@@ -3867,8 +3869,9 @@ pub struct ThreadForkParams {
#[experimental("thread/fork.excludeTurns")]
#[serde(default, skip_serializing_if = "std::ops::Not::not")]
pub exclude_turns: bool,
/// If true, persist additional rollout EventMsg variants required to
/// reconstruct a richer thread history on subsequent resume/fork/read.
/// If true, persist additional EventMsg variants to the rollout file.
/// However, `thread/read`, `thread/resume`, and `thread/fork` still only
/// return the limited form of thread history for scalability reasons.
#[experimental("thread/fork.persistFullHistory")]
#[serde(default)]
pub persist_extended_history: bool,