Charlie Marsh 0bc73bbeb1 Add opt-in protocol discovery for local stdio MCP servers (#57210) ...

## Why

Stdio servers without `CODEX_MCP_PROTOCOL_VERSION` use the legacy handshake, even when they support MCP `2026-07-28`.

## What changed

- Add the disabled-by-default `mcp_connection_sharing` feature to enable discovery for eligible local stdio servers.
- Recover from failed or late discovery with a fresh handshake when needed, waiting for the previous helper to release resources before restarting.
- Retain a working legacy connection when an upgrade attempt fails for the same account, except on authentication errors.
- Keep tool catalogs separate by protocol and invalidate legacy catalogs when discovery negotiates the modern protocol.

## Testing

Add regression coverage for failed and late discovery, legacy fallback, protocol-specific catalog reuse, message limits, and Windows descendant cleanup.

GitOrigin-RevId: 36c675ef3b81d32fccf06ccbddda2312cfe602c9

2026-10-26 19:37:06 +00:00

..

absolute-path

Support Windows registry overrides for requirements.toml (#55456)

2026-10-20 04:49:25 +00:00

approval-presets

tui: pass active permission profiles through app commands (#22891)

2026-05-15 22:42:35 +00:00

audio

Add opt-in output token replay for OpenAI requests (#52742)

2026-10-10 01:25:00 +00:00

cache

Consolidate Rust unit tests under dedicated test modules (#56247)

2026-10-22 19:36:47 +00:00

cargo-bin

Normalize formatting in docs, web assets, and sample scripts (#52256)

2026-10-08 20:11:43 +00:00

cli

Add managed worktrees to codex exec (#42652)

2026-09-04 01:56:38 +00:00

critical-path

Add a critical-path utility for exclusive duration attribution (#55804)

2026-10-21 07:33:13 +00:00

elapsed

Disable empty Cargo test targets (#21584)

2026-05-07 15:44:17 -07:00

fuzzy-match

Fix fuzzy match scoring within Unicode lowercase expansions (#45475)

2026-09-14 17:36:11 +00:00

git-discovery

Bound Git root discovery for metadata enrichment (#42132)

2026-09-01 20:41:32 +00:00

head-tail-buffer

Extract the head-tail buffer into a utility crate (#56535)

2026-10-23 17:35:25 +00:00

home-dir

Disable empty Cargo test targets (#21584)

2026-05-07 15:44:17 -07:00

image

Reduce dependency coupling in shared configuration crates (#47713)

2026-09-24 01:50:36 +00:00

json-to-toml

Disable empty Cargo test targets (#21584)

2026-05-07 15:44:17 -07:00

oss

Route Ollama through the shared HTTP client (#36078)

2026-07-30 04:26:36 +00:00

output-truncation

Account for JSON overhead when truncating MCP tool results (#50470)

2026-10-03 00:13:58 +00:00

path-uri

Upgrade the Rust toolchain to 1.99.1 (#55677)

2026-10-20 21:28:45 +00:00

path-utils

Clean up failed and abandoned marketplace staging directories (#55689)

2026-10-20 22:25:54 +00:00

plugins

Route skill discovery and loading through EnvironmentAccess (#46293)

2026-09-17 19:52:03 +00:00

process

Suppress Windows console windows for background subprocesses (#49164)

2026-09-29 04:38:37 +00:00

pty

Add opt-in protocol discovery for local stdio MCP servers (#57210)

2026-10-26 19:37:06 +00:00

readiness

[codex] Remove async_trait from first-party code (#27475)

2026-06-11 18:16:39 -07:00

redacted-string

Keep credentials out of app-server logs (#39993)

2026-08-21 19:04:32 +00:00

rustls-provider

Use aws-lc-rs for rustls crypto provider (#27706)

2026-06-15 11:32:13 -07:00

sandbox-summary

Preserve executor path conventions in permission summaries (#45852)

2026-09-16 03:40:53 +00:00

sleep-inhibitor

Upgrade Windows bindings to windows-sys 0.61.2 (#50058)

2026-10-01 18:05:05 +00:00

stream-parser

Upgrade the Rust toolchain to 1.99.1 (#55677)

2026-10-20 21:28:45 +00:00

string

Track content provenance through prompt assembly and compaction (#53831)

2026-10-14 02:01:49 +00:00

template

Disable empty Cargo test targets (#21584)

2026-05-07 15:44:17 -07:00