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Add OpenCode as a supported host #14

Description

@Puri12

Summary

Forge Skills currently ships to Claude Code, Cursor, Codex, Gemini CLI, GitHub Copilot CLI, and Rovo Dev. OpenCode is a popular open-source agent CLI that also supports Agent Skills + MCP servers, but there's no OpenCode integration here yet. I'd like to add it so the same six Forge skills + Forge/ADS MCP servers work in OpenCode.

How OpenCode differs

Unlike the other hosts, OpenCode has no declarative skill/MCP plugin manifest (no equivalent of .claude-plugin/plugin.json). It's configured either via opencode.json (mcp, skills.paths) or via a plugin: a small JS/TS module whose config hook registers MCP servers and skill paths.

Proposed approach

A tiny, dependency-free plugin at .opencode-plugin/forge-skills.js, loaded by a committed opencode.json (plugin array). Its config hook registers the forge + ads-mcp remote MCP servers and adds skills/ to skills.paths (resolved via import.meta). It is idempotent and never overwrites user config. Verified on OpenCode v1.17.7.

Naming / mechanism question

I named the folder .opencode-plugin/ to match this repo's per-host convention (.claude-plugin/, .codex-plugin/, .cursor-plugin/), and load it via opencode.json because OpenCode only auto-discovers its own default .opencode/plugins/ directory. Would you prefer instead:

  1. OpenCode's idiomatic .opencode/plugins/forge-skills.js (auto-loaded, no opencode.json), or
  2. a fully declarative opencode.json (no plugin code)?

Happy to switch — a draft PR is ready.

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