Maintain cross-platform AgentSys

AgentSys installs the agent-sh plugins on Claude Code, OpenCode, Codex CLI, Cursor and Kiro. The plugins live in their own repos; this repo owns the marketplace, the installer, the transforms and the docs. Use this skill to find where a cross-platform concern lives and what to run.

Platform details (config formats, frontmatter, env vars, label limits) are in checklists/cross-platform-compatibility.md and docs/CROSS_PLATFORM.md; release steps are in checklists/release.md and agent-docs/release.md. Read them for the current facts instead of relying on memory.

Where things live

Concern	Location
Marketplace, one entry per plugin pinned by tag and commit	.claude-plugin/marketplace.json; re-pin with node scripts/pin-marketplace.js [--dry-run] (needs gh)
Installer	bin/cli.js: installForClaude, installForOpenCode, installForCodex, installForCursor, installForKiro. Claude Code installs from the marketplace; the others fetch plugin sources into ~/.agentsys/plugins/<name> and transform them.
Transforms (frontmatter, tools to permissions, plugin-root paths, namespaces)	lib/adapter-transforms.js. lib/ is synced from agent-sh/agent-core, so make the change there; an edit here is overwritten by the next sync.
Platform adapters	adapters/opencode-plugin/ (native OpenCode plugin), adapters/opencode/, adapters/codex/; scripts/gen-adapters.js keeps generated files fresh
Dev installs	node bin/dev-cli.js dev-install [tool] (scripts/dev-install.js)
Versions	package.json is the source; npx agentsys-dev bump X.Y.Z stamps package-lock.json, .claude-plugin/plugin.json, marketplace.json and site/content.json. Plugin repos version independently.
Generated doc sections	<!-- GEN:START:... --> blocks, rewritten by npx agentsys-dev gen-docs

Platform differences behind most bugs

• Plugin root: ${CLAUDE_PLUGIN_ROOT} in Claude Code, ${PLUGIN_ROOT} in OpenCode and Codex; Cursor and Kiro get the install path inlined. Normalize backslashes in require() paths (.replace(/\\/g, '/')), because a Windows path such as C:\Users\... turns into escape sequences.
• State directory: use AI_STATE_DIR (.opencode, .codex, .cursor, .kiro; unset means .claude) instead of a hardcoded .claude/. validate paths catches hardcoded ones.
• OpenCode: model fields are stripped by default (--no-strip keeps them), tools become permission: entries, and AskUserQuestion labels longer than 30 characters fail.
• Codex has no commands or agents: commands become skills invoked as $name, so every skill description needs trigger phrases ("Use when ...").
• Kiro: commands become prompts in ~/.kiro/prompts/, agents become JSON in ~/.kiro/agents/, and two combined reviewer agents fit its 4-subagent limit. Each skill directory is copied whole to ~/.kiro/skills/<name>/, away from its plugin, so the installer and the Kiro transforms point plugin-root wording ("two directories up from this skill"), relative links that leave the skill directory, and versioned-cache globs (**/<plugin>/*/) at ~/.agentsys/plugins/<plugin>.

Checks

Command	Covers
npm run validate	plugins, cross-platform, consistency, paths, counts, platform-docs, agent-skill-compliance
npm test	Jest suite
npm run gen-docs:check, node scripts/expand-templates.js --check, node scripts/gen-adapters.js --check	Generated content is fresh (CI runs all three)
npx agentsys-dev preflight [--all|--release]	Change-aware checklist checks. The pre-push hook runs it, asks for the /enhance confirmation, and runs --release when a v* tag is pushed.
node bin/dev-cli.js validate opencode-install	A real OpenCode install (not part of validate)
npm pack --dry-run	The package builds

Before a release, smoke-test the installer: npm pack, npm install -g ./agentsys-*.tgz, run agentsys, and check each platform's install directory as checklists/release.md lists.

If this skill or a checklist no longer matches the code, fix it in the same change.

Output

## Cross-Platform Compatibility Check

### Validations run
- [OK|ERROR] <validator>: <one line>

### Issues
- <file:line>: <problem> - <fix>

### Docs out of date
- <file>: <what no longer matches>

### Actions taken
- <files changed>

### Next steps
- <remaining work, or "none">