Files
codex/codex-rs/app-server-client/Cargo.toml
Rasmus Rygaard 7b994100b3 Add session config loader interface (#18208)
## Why

Cloud-hosted sessions need a way for the service that starts or manages
a thread to provide session-owned config without treating all config as
if it came from the same user/project/workspace TOML stack.

The important boundary is ownership: some values should be controlled by
the session/orchestrator, some by the authenticated user, and later some
may come from the executor. The earlier broad config-store shape made
that boundary too fuzzy and overlapped heavily with the existing
filesystem-backed config loader. This PR starts with the smaller piece
we need now: a typed session config loader that can feed the existing
config layer stack while preserving the normal precedence and merge
behavior.

## What Changed

- Added `ThreadConfigLoader` and related typed payloads in
`codex-config`.
- `SessionThreadConfig` currently supports `model_provider`,
`model_providers`, and feature flags.
- `UserThreadConfig` is present as an ownership boundary, but does not
yet add TOML-backed fields.
- `NoopThreadConfigLoader` preserves existing behavior when no external
loader is configured.
  - `StaticThreadConfigLoader` supports tests and simple callers.

- Taught thread config sources to produce ordinary `ConfigLayerEntry`
values so the existing `ConfigLayerStack` remains the place where
precedence and merging happen.

- Wired the loader through `ConfigBuilder`, the config loader, and
app-server startup paths so app-server can provide session-owned config
before deriving a thread config.

- Added coverage for:
  - translating typed thread config into config layers,
- inserting thread config layers into the stack at the right precedence,
- applying session-provided model provider and feature settings when
app-server derives config from thread params.

## Follow-Ups

This intentionally stops short of adding the remote/service transport.
The next pieces are expected to be:

1. Define the proto/API shape for this interface.
2. Add a client implementation that can source session config from the
service side.

## Verification

- Added unit coverage in `codex-config` for the loader and layer
conversion.
- Added `codex-core` config loader coverage for thread config layer
precedence.
- Added app-server coverage that verifies session thread config wins
over request-provided config for model provider and feature settings.
2026-04-20 23:05:49 +00:00

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TOML

[package]
name = "codex-app-server-client"
version.workspace = true
edition.workspace = true
license.workspace = true
[lib]
name = "codex_app_server_client"
path = "src/lib.rs"
[lints]
workspace = true
[dependencies]
codex-app-server = { workspace = true }
codex-app-server-protocol = { workspace = true }
codex-arg0 = { workspace = true }
codex-config = { workspace = true }
codex-core = { workspace = true }
codex-exec-server = { workspace = true }
codex-feedback = { workspace = true }
codex-protocol = { workspace = true }
codex-utils-rustls-provider = { workspace = true }
futures = { workspace = true }
serde = { workspace = true }
serde_json = { workspace = true }
tokio = { workspace = true, features = ["sync", "time", "rt"] }
tokio-tungstenite = { workspace = true }
toml = { workspace = true }
tracing = { workspace = true }
url = { workspace = true }
[dev-dependencies]
pretty_assertions = { workspace = true }
serde_json = { workspace = true }
tokio = { workspace = true, features = ["macros", "rt-multi-thread"] }