feat: add top-level plugin.json for elasticsearch and sync it via CI

[flobernd]

Summary

• Adds plugins/elasticsearch/plugin.json — a top-level npm-style manifest for the Elasticsearch plugin with a skills list, author.url, and homepage fields not present in the .claude-plugin/ variant
• Updates .github/workflows/version-sync.yml to include plugins/elasticsearch/plugin.json alongside the existing .claude-plugin/plugin.json so the release CI keeps all version fields in sync

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As requested by @gregorycrist

[gregorycrist]

Thanks Florian. Once we have the support of GitHub Copilot Plugins, I can request we be added to the awesome-copilot plug in marketplace. https://github.com/github/awesome-copilot/blob/main/docs/README.plugins.md

[gregorycrist]

@nayrttam or @MattDevy Could you get this reviewed and approved today? I would like to publish a blog about using this GitHub Copilot CLI plugin next week for the Microsoft Build developer conference. Thanks!

[MattDevy]

Hey @gregorycrist @flobernd is there a reason we're only adding this for the elasticsearch plugin, and not the other namespaces?

[gregorycrist]

That is a good idea to include Observability, security, etc. I was just doing the quick and dirty one that I needed for my blog. Should I try to generate the other plugins as well, or are you able to?

[gregorycrist]

the GitHub Copilot CLI plugin reference states that skills is optional and defaults to ./skills/ when omitted. Based on that, i believe it is ok to remove.

[MattDevy]

That is a good idea to include Observability, security, etc. I was just doing the quick and dirty one that I needed for my blog. Should I try to generate the other plugins as well, or are you able to?

the GitHub Copilot CLI plugin reference states that skills is optional and defaults to ./skills/ when omitted. Based on that, i believe it is ok to remove.

I've added the other plugins, do we also want to add a .github/plugin/marketplace.json like https://github.com/github/copilot-plugins/blob/main/.github/plugin/marketplace.json ?

[gregorycrist]

yes on the marketplace.json.

[Anaethelion]

This is good, please make sure this doesn't break the existing integrations and marketplaces before we move forward. :)

[MattDevy]

This is good, please make sure this doesn't break the existing integrations and marketplaces before we move forward. :)

I've just checked the claude marketplace / plugins by running locally on the branch, and all looks good there.

Cursor doesn't replicate from ./plugins folder, only ./skills/** so we're all there

[gregorycrist]

Thanks Matt. Now I am getting conflicting information from GitHub Copilot. The awesome-copilot plugin marketplace is telling me that I do need the skills field. Also the plugin name has to match the directory name? Sorry.

❌ [plugin:elastic-elasticsearch] Plugin name 'elastic-elasticsearch' does not match directory name 'elasticsearch'.
❌ [plugin:elastic-elasticsearch] plugin.json has no 'skills' field — required.
{Ansi.Red}Plugin spec conformance failures — fix the errors above.{Ansi.Reset}

[MattDevy]

Thanks Matt. Now I am getting conflicting information from GitHub Copilot. The awesome-copilot plugin marketplace is telling me that I do need the skills field. Also the plugin name has to match the directory name? Sorry.

❌ [plugin:elastic-elasticsearch] Plugin name 'elastic-elasticsearch' does not match directory name 'elasticsearch'. ❌ [plugin:elastic-elasticsearch] plugin.json has no 'skills' field — required. {Ansi.Red}Plugin spec conformance failures — fix the errors above.{Ansi.Reset}

Hmmm interesting, it seems their validation is tighter than copilot itself

…/agent-skills   automation/skills-sync $   v25.8.1   16:37
❯ copilot plugin marketplace add elastic/agent-skills
Marketplace "elastic-agent-skills" added successfully.

 …/agent-skills   automation/skills-sync $   v25.8.1   16:37
❯ copilot plugin install elastic-elasticsearch@elastic-agent-skills
copilot plugin install elastic-kibana@elastic-agent-skills
copilot plugin install elastic-observability@elastic-agent-skills
copilot plugin install elastic-security@elastic-agent-skills
copilot plugin install elastic-cloud@elastic-agent-skills
Plugin "elastic-elasticsearch" installed successfully. Installed 7 skills.
Plugin "elastic-kibana" installed successfully. Installed 8 skills.
Plugin "elastic-observability" installed successfully. Installed 11 skills.
Plugin "elastic-security" installed successfully. Installed 4 skills.
Plugin "elastic-cloud" installed successfully. Installed 5 skills.

[gregorycrist]

definitely. Here is the PR issue from awesome-copilot. github/awesome-copilot#1865