[FEATURE]: discover skills installed by VS Code agent plugins and Claude Code plugins #40629

• I have verified this feature I'm about to request hasn't been suggested before.

Describe the enhancement you want to request

opencode's built-in skill discovery (packages/opencode/src/skill/index.ts) scans ~/.claude/skills/** and ~/.agents/skills/**, plus skills.paths/skills.urls from config. It does NOT discover skills that VS Code agent plugins and Claude Code plugins install in their own plugin directories. Those skills only become usable if a user manually copies them into skills.paths or installs a third-party plugin.

Concretely, this means skills from VS Code agent plugins (e.g. bitovi/ai-enablement-prompts) and Claude Code plugins installed on the same machine are invisible to opencode out of the box — even though they're sitting on disk.

Proposal

Add built-in scanning of the well-known VS Code and Claude plugin skill locations to core skill discovery, so these skills appear without any config:

• VS Code agent plugins, per-OS data dirs: ~/.vscode/agent-plugins, ~/.config/Code/agentPlugins, ~/Library/Application Support/Code/agentPlugins, %APPDATA%\Code\agentPlugins, plus Code - Insiders variants. Install layout is {host}/{org}/{repo} with optional installed.json / cache.json manifests.
• Remote VS Code hosts (Remote-SSH, Dev Containers, Codespaces, WSL): ~/.vscode-server/data/agentPlugins. VS Code syncs enabled skills into a flattened "VS Code Synced Data" bundle under {sanitizedUri}/{nonce}/skills/... and records entries in cache.json.
• Claude Code plugins: ~/.claude/plugins/installed_plugins.json and, on remote hosts, ~/.claude/remote/plugins/installed_plugins.json.

Manifests should be read to resolve the on-disk skill directories, and a fallback tree-walk is only used when no manifest exists, so cloned-but-not-installed marketplaces are not surfaced.

There is already a working reference implementation I maintain as an opencode plugin: https://github.com/Marinski/opencode-skill-autodiscovery (v1.1.4) — it reads the VS Code installed.json/cache.json manifests and the Claude installed_plugins.json, resolves skill dirs, and registers them. The same logic could be ported directly into core's discoverSkills.

If this belongs in core, I'd be happy to open a PR porting the discovery logic.

Bellow is a preview from the chat and the skills discovered (those aren't skills from my skills folder, but skills coming from my VS Code agentPlugins: