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Adam Perry @ OpenAI 236b50125d [codex] Load user instructions through an injected provider (#27101)
## Why

We want to remove implicit use of `$CODEX_HOME` from `codex-core` and
make embedders responsible for supplying user-level instructions. This
also ensures user instructions load when no primary environment is
selected.

## What changed

Stacked on #27415, which makes `codex exec` surface thread-scoped
runtime warnings.

- Added `UserInstructionsProvider` to `codex-extension-api`, with
absolute source attribution and recoverable loading warnings.
- Added `codex-home` with the filesystem-backed provider for
`AGENTS.override.md` and `AGENTS.md`, preserving precedence, fallback,
trimming, lossy UTF-8 handling, and the existing uncapped global
instruction size.
- Removed global instruction loading from `Config` and require
`ThreadManager` callers to inject a provider.
- Load provider instructions once for each fresh root runtime, including
runtimes without a primary environment. Running sessions retain their
snapshot, while child agents inherit the parent snapshot without
invoking the provider.
- Keep provider instructions separate while loading project `AGENTS.md`,
then assemble the model-visible instructions with the existing ordering,
source attribution, warning, and turn-context behavior.
- Wired the Codex home provider through the CLI, app server, MCP server,
core facade, and thread-manager sample.

## Validation

- `just test -p codex-home -p codex-extension-api`
- `just test -p codex-core agents_md`
- `just test -p codex-core guardian`
- `just test -p codex-app-server
thread_start_without_selected_environment_includes_only_global_instruction_source`
- `just test -p codex-exec warning`
- `just bazel-lock-check`
2026-06-11 19:28:47 +00:00

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[package]
edition.workspace = true
license.workspace = true
name = "codex-core-api"
version.workspace = true
[lib]
doctest = false
name = "codex_core_api"
path = "src/lib.rs"
test = false
[lints]
workspace = true
[dependencies]
codex-app-server-protocol = { workspace = true }
codex-arg0 = { workspace = true }
codex-analytics = { workspace = true }
codex-config = { workspace = true }
codex-core = { workspace = true }
codex-extension-api = { workspace = true }
codex-home = { workspace = true }
codex-exec-server = { workspace = true }
codex-features = { workspace = true }
codex-login = { workspace = true }
codex-model-provider-info = { workspace = true }
codex-models-manager = { workspace = true }
codex-protocol = { workspace = true }
codex-utils-absolute-path = { workspace = true }