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## Why Reverts #20689 to restore the previous optional state DB plumbing. The conflict resolution keeps the newer installation ID and session/thread identity changes that landed after #20689, while removing the mandatory state DB and agent graph store dependency from ThreadManager construction. ## What changed - Restored `Option<StateDbHandle>` through app-server, MCP server, prompt debug, and test entry points. - Removed the `codex-core` dependency on `codex-agent-graph-store` and reverted descendant lookup back to the existing state DB path when available. - Kept newer `installation_id` forwarding by passing it beside the optional DB handle. - Kept local thread-name updates working when the optional state DB handle is absent. ## Validation - `git diff --check` - `cargo test -p codex-thread-store` - `cargo test -p codex-state -p codex-rollout -p codex-app-server-protocol` - Attempted `env CARGO_INCREMENTAL=0 cargo test -p codex-core -p codex-app-server -p codex-app-server-client -p codex-mcp-server -p codex-thread-manager-sample -p codex-tui`; blocked locally by a rustc ICE while compiling `v8 v146.4.0` with `rustc 1.93.0 (254b59607 2026-01-19)` on `aarch64-apple-darwin`.
ThreadManager Sample
Small one-shot binary that starts a Codex thread with ThreadManager from
codex-core-api, submits a single user turn, and prints the final assistant
message.
cargo run -p codex-thread-manager-sample -- "Say hello"
Use --model to override the configured default model:
cargo run -p codex-thread-manager-sample -- --model gpt-5.2 "Say hello"
The prompt can also be piped through stdin:
printf 'Say hello\n' | cargo run -p codex-thread-manager-sample