stefanstokic-oai 6d8e12ac42 [codex] Speed up external agent session imports (#26637) ...

## Why

Importing large external-agent session histories currently starts a full
live Codex thread for every imported session. This initializes unrelated
runtime systems and repeats expensive transcript, metadata, hashing, and
ledger work.

On a 50-session, 238 MiB fixture, the existing path took roughly 70
seconds to complete the import and 77 seconds end to end.

## What changed

- Persist imported sessions directly through `ThreadStore` instead of
starting full live threads.
- Process imports through a bounded five-session pipeline.
- Parse, extract, and hash each source file in one pass.
- Move blocking source preparation onto the blocking thread pool.
- Reuse prepared content hashes and update the import ledger once per
batch.
- Avoid metadata readback for newly written rollouts.
- Preserve imported conversation history and visible thread metadata.
- Keep the implementation out of `codex-core` and avoid changes to the
public `ThreadStore` trait.

## Performance

For the same 50-session, 238 MiB fixture:

| Path | Import completion | End to end |
| --- | ---: | ---: |
| Existing import | 69.61s | 76.62s |
| This change | 5.95s | 6.58s |

All 50 sessions imported successfully with no warnings or contention
signals.

## Validation

- `just test -p codex-external-agent-sessions`
- `just test -p codex-app-server external_agent_config_import`
- Verified imports do not initialize unrelated required MCP servers.
- Verified previously imported source versions are skipped and changed
sources can be imported again.
- Verified imported rollouts remain readable through thread listing and
history APIs.

6d8e12ac42 · 2026-06-08 14:16:32 -04:00

History

..

src

[codex] Speed up external agent session imports (#26637)

2026-06-08 14:16:32 -04:00

BUILD.bazel

External agent session support (#19895)

2026-04-28 17:42:36 +00:00

Cargo.toml

External agent session support (#19895)

2026-04-28 17:42:36 +00:00