Alpha· Notable · Confirmed
MCP tool search becomes the default as collaboration tools get a namespace
Codex switched MCP discovery to tool search by default, moved multi-agent v2 tools under collaboration, and fixed an Apps authentication hang.
This window changes how tools are found and addressed. The MCP path becomes more search-driven, while multi-agent callers need to account for the collaboration namespace.
Alpha release context: 7 official tags were published that UTC day (rust-v0.143.0-alpha.2, rust-v0.143.0-alpha.3, rust-v0.143.0-alpha.4, rust-v0.143.0-alpha.5, rust-v0.143.0-alpha.6, rust-v0.143.0-alpha.7, rust-v0.143.0-alpha.9). The full comparison contains 41 commits and 257 changed files.
Evidence
Codex uses tool search for MCP tools by default.Why it matters: Large MCP tool catalogs no longer need to be exposed wholesale before Codex can discover the relevant tool.
Direct evidence · Confirmed
Supporting sources
- [codex] Use tool search for MCP tools by default (#29486) commit · Official
- rust-v0.143.0-alpha.1 to rust-v0.143.0-alpha.9 comparison tag-compare · Official
Conflicting sources
No conflicting sources recorded.
Multi-agent v2 tools are namespaced under collaboration.Why it matters: Integrations that referred to the earlier tool names may need to update their calls to the collaboration namespace.
Direct evidence · Confirmed
Supporting sources
- Namespace multi-agent v2 tools under collaboration (#29067) commit · Official
- rust-v0.143.0-alpha.1 to rust-v0.143.0-alpha.9 comparison tag-compare · Official
Conflicting sources
No conflicting sources recorded.
A Codex Apps authentication elicitation hang was fixed.Why it matters: App connections that need authentication should no longer remain stuck at the elicitation step for this failure mode.
Direct evidence · Confirmed
Supporting sources
- Fix Codex Apps auth elicitation hang (#29615) commit · Official
- rust-v0.143.0-alpha.1 to rust-v0.143.0-alpha.9 comparison tag-compare · Official
Conflicting sources
No conflicting sources recorded.
Availability
Availability note: these sources establish repository and CLI release activity. They do not, by themselves, prove that the same changes were live in Codex Desktop.
Availability by surface
| Surface | Status | Claim-level evidence |
|---|---|---|
| CLI | Prerelease · Documented · General |
|
| Desktop | Unknown · Unknown · Unknown |
|
| IDE | Unknown | No central-claim assertion recorded. |
| Cloud | Unknown | No central-claim assertion recorded. |
| Mobile | Unknown | No central-claim assertion recorded. |