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Run code mode exclusively through the standalone host (#36217)

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## What changed

- Move the V8 implementation into a dedicated `codex-code-mode-runtime` crate used by `codex-code-mode-host`, removing the embedded runtime fallback from the Codex process.
- Resolve the host executable from the active installation layout and check its availability before selecting tools.
- Fall back to direct tools with a one-time warning when optional code mode is unavailable. Keep `code_mode_only` and `disable_in_process_fallback` configurations fail-closed.

## Testing

- Cover host discovery for standalone and package layouts, including missing hosts and symlinks.
- Verify direct-tool fallback, one-time warnings, and fail-closed code-mode-only behavior.

GitOrigin-RevId: 5aa3c6f1db148b2231fc24089a2ee0e2b00dbddb
This commit is contained in:
Channing Conger
2026-07-30 20:24:29 +00:00
committed by copyberry
parent acd540f158
commit 97576b1794
51 changed files with 627 additions and 424 deletions
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codex-rs/code-mode-host/src/lib.rs
+1 -1
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@@ -10,7 +10,6 @@ use std::time::Duration;
use anyhow::Context;
use anyhow::Result;
use codex_code_mode::InProcessCodeModeSession;
use codex_code_mode_protocol::host::CapabilitySet;
use codex_code_mode_protocol::host::ClientToHost;
use codex_code_mode_protocol::host::EncodedFrame;
@@ -23,6 +22,7 @@ use codex_code_mode_protocol::host::ProtocolVersion;
use codex_code_mode_protocol::host::RequestId;
use codex_code_mode_protocol::host::SessionId;
use codex_code_mode_protocol::host::SupportedProtocolVersions;
use codex_code_mode_runtime::InProcessCodeModeSession;
use tokio::io::AsyncRead;
use tokio::io::AsyncWrite;
use tokio::sync::Semaphore;