Add Codex-native plugin marketplace manifest

[Copilot]

Codex CLI (v0.121.0+) now supports a plugin marketplace comparable to Claude Code / Cursor / Copilot CLI. This repo previously only documented per-skill installation via skill-installer for Codex users.

Changes

• .agents/plugins/marketplace.json (new) — Codex-native marketplace manifest at the path Codex auto-discovers, mirroring the 11 plugin entries from the existing Claude / Cursor / GitHub manifests. Includes interface.displayName for the /plugins UI tab.
• README.md — Codex CLI section now leads with the marketplace flow and keeps the skill-installer per-skill flow as a secondary option:

  codex plugin marketplace add dotnet/skills
  # then in Codex:
  /plugins

• CONTRIBUTING.md — Added .agents/plugins/marketplace.json to the list of manifests that must be kept in sync when adding a new plugin (now four: GitHub, Claude, Cursor, Codex).

Notes for reviewers

• All four manifests carry identical (name, source) pairs; verified programmatically.
• .agents/plugins/marketplace.json is the Codex-native discovery path per the marketplace docs. Codex also falls back to .claude-plugin/marketplace.json, but shipping the native path makes the intent explicit and lets us diverge later (e.g., Codex-only policy / category fields) without affecting Claude consumers.
• No build/test infrastructure exists for marketplace manifests; drift prevention remains contributor discipline guided by CONTRIBUTING.md.

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[Evangelink]

@ViktorHofer please review

[Copilot]

Pull request overview

Adds a Codex-native plugin marketplace manifest so Codex CLI can auto-discover this repo’s plugin marketplace, and updates docs to guide Codex users toward the marketplace-based install flow.

Changes:

• Added .agents/plugins/marketplace.json as the Codex-native marketplace manifest (with interface.displayName for UI presentation).
• Updated README.md to document the Codex marketplace flow as the recommended installation path (keeping skill-installer as an alternative).
• Updated CONTRIBUTING.md to require keeping the new Codex manifest in sync with the existing marketplace manifests.

Show a summary per file

File	Description
README.md	Documents Codex CLI marketplace installation and upgrade flow for this repo.
CONTRIBUTING.md	Updates contributor guidance to keep the new Codex manifest in sync with other manifests.
.agents/plugins/marketplace.json	Introduces the Codex-native marketplace manifest with the same plugin entries as existing manifests.

Copilot's findings

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• Files reviewed: 3/3 changed files
• Comments generated: 0

[Evangelink]

Let's wait for @ManishJayaswal greenlight before merging this one.

[github-actions]

This PR has been automatically marked as stale because it has no activity for 30 days. It will be closed if no further activity occurs within another 7 days of this comment. If it is closed, you may reopen it anytime when you're ready again.

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[Evangelink]

@AbhitejJohn What's the status of this?

[mwpastore]

The new Codex manifest in this rapidly-aging PR is now missing the newer dotnet-blazor and dotnet11 plugins.

[alvind-humanforce]

Any updates on this?

[AbhitejJohn]

@Evangelink : Apologies for the delay, lets get this across. Please let me know if you need any help to do so. Sounds like we might need an update.

[github-actions]

✅ Approved by @ViktorHofer. cc @dotnet/skills-merge-approvers — ready to merge.