Better Codex MCP plugin

This portable Agent Plugins 1.0.0 package starts the stable better-codex mcp entrypoint. The existing Better Codex CLI must be available on PATH. The plugin ensures the existing local Runtime is available; it never starts a second authority, collects browser credentials, creates a tunnel, or runs external workers.

board opens the existing generated board as a standard MCP App. Native tasks and external observations share the board; observation details remain read-only. The MCP board browser uses host-mediated tools and never receives a Runtime token. Dedicated task tools support task content creation and editing; external report tools only record observations. They do not execute, accept, hand off, archive, or otherwise take ownership of external work. The full plugin page replaces legacy desktop page injection; sidebar injection and its recovery tools are retired.

The OpenAI global sidebar entrypoint is host-specific. Standard MCP Apps hosts can open the board through its tool resource. Hosts without MCP Apps support can use the text tools. Host-mediated resource subscriptions are capability-gated; bounded polling provides refresh when subscriptions are unavailable.

Validate the manifests from the repository root with:

node scripts/validate-plugin.mjs

The validator uses unchanged official schemas stored in scripts/schemas/, downloaded from https://agent-plugins.org/schemas/1.0.0/. This command checks schema conformance only; it does not verify host installation or end-to-end Runtime behavior. The portable format follows the official packaging guide: https://developers.openai.com/plugins/build/plugins

No plugin registration or marketplace file is changed by building or validating this package. Host registration, installation, authentication, and publication require a separate explicit action.

The local MCP server does not automatically become available to cloud Dot. This release does not expose a Dot setup entrypoint. External observation tools remain available to authenticated clients that can reach the local Runtime.

Historical development evidence in the MCP documentation records a 2026-10-01 check of 0.4.19-local.mcp.2 with Codex 0.159.3. That check covered the then-current plugin inventory, report ingestion and deduplication, and the MCP App resource. It is not acceptance evidence for the current release or for a cloud Dot connection. Existing conversations may require a fresh conversation to load an updated tool inventory.