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31b233c7c6
Add Codex config for static trace span attributes and structured W3C tracestate field upserts. The config flows through OtelSettings so callers can attach trace metadata without touching every span call site. Apply span attributes with an SDK span processor so every exported trace span carries the configured metadata. Model tracestate as nested member fields so configured keys can be upserted while unrelated propagated state in the same member is preserved. Validate configured tracestate before installing provider-global state, including header-unsafe values the SDK does not reject by itself. This keeps Codex from propagating malformed trace context from config. Update the config schema, public docs, and OTLP loopback coverage for config parsing, span export, propagation, and invalid-header rejection.
codex-config loader
This module is the canonical place to load and describe Codex configuration layers (user config, CLI/session overrides, managed config, and MDM-managed preferences) and to produce:
- An effective merged TOML config.
- Per-key origins metadata (which layer “wins” for a given key).
- Per-layer versions (stable fingerprints) used for optimistic concurrency / conflict detection.
Public surface
Exported from codex_config::loader:
load_config_layers_state(fs, codex_home, cwd_opt, cli_overrides, overrides, cloud_requirements, thread_config_loader) -> ConfigLayerStackConfigLayerStackeffective_config() -> toml::Valueorigins() -> HashMap<String, ConfigLayerMetadata>layers_high_to_low() -> Vec<ConfigLayer>with_user_config(user_config) -> ConfigLayerStack
ConfigLayerEntry(one layer’s{name, config, version, disabled_reason};namecarries source metadata)LoaderOverrides(test/override hooks for managed config sources)merge_toml_values(base, overlay)(public helper used elsewhere)
Layering model
Precedence is top overrides bottom:
- MDM managed preferences (macOS only)
- System managed config (e.g.
managed_config.toml) - Session flags (CLI overrides, applied as dotted-path TOML writes)
- User config (
config.toml)
Thread config entries supplied by thread_config_loader are inserted according
to their translated ConfigLayerSource precedence.
Layers with a disabled_reason are still surfaced for UI, but are ignored when
computing the effective config and origins metadata. This is what
ConfigLayerStack::effective_config() implements.
Typical usage
Most callers want the effective config plus metadata:
use codex_config::NoopThreadConfigLoader;
use codex_config::CloudRequirementsLoader;
use codex_config::LoaderOverrides;
use codex_config::loader::load_config_layers_state;
use codex_exec_server::LOCAL_FS;
use codex_utils_absolute_path::AbsolutePathBuf;
use toml::Value as TomlValue;
let cli_overrides: Vec<(String, TomlValue)> = Vec::new();
let cwd = AbsolutePathBuf::current_dir()?;
let layers = load_config_layers_state(
LOCAL_FS.as_ref(),
&codex_home,
Some(cwd),
&cli_overrides,
LoaderOverrides::default(),
CloudRequirementsLoader::default(),
&NoopThreadConfigLoader,
).await?;
let effective = layers.effective_config();
let origins = layers.origins();
let layers_for_ui = layers.layers_high_to_low();
Internal layout
Implementation is split by concern:
state.rs: public types (ConfigLayerEntry,ConfigLayerStack) + merge/origins convenience methods.layer_io.rs: readingconfig.toml, managed config, and managed preferences inputs.overrides.rs: CLI dotted-path overrides → TOML “session flags” layer.merge.rs: recursive TOML merge.fingerprint.rs: stable per-layer hashing and per-key origins traversal.macos.rs: managed preferences integration (macOS only).