Auto-detect Install Targets and Add Gemini Sync

Overview

Two related improvements to the converter CLI:

1. install --to all — Auto-detect which AI coding tools are installed and convert to all of them in one command
2. sync --target gemini — Add Gemini CLI as a sync target (currently missing), then add sync --target all to sync personal config to every detected tool

Problem Statement

Users currently must run 6 separate commands to install to all targets:

bunx @every-env/compound-plugin install compound-engineering --to opencode
bunx @every-env/compound-plugin install compound-engineering --to codex
bunx @every-env/compound-plugin install compound-engineering --to droid
bunx @every-env/compound-plugin install compound-engineering --to cursor
bunx @every-env/compound-plugin install compound-engineering --to pi
bunx @every-env/compound-plugin install compound-engineering --to gemini

Similarly, sync requires separate commands per target. And Gemini sync doesn't exist yet.

Acceptance Criteria

Auto-detect install

• [x]install --to all detects installed tools and installs to each
• [x]Detection checks config directories and/or binaries for each tool
• [x]Prints which tools were detected and which were skipped
• [x]Tools with no detection signal are skipped (not errored)
• [x]convert --to all also works (same detection logic)
• [x]Existing --to <target> behavior unchanged
• [x]Tests for detection logic and all target handling

Gemini sync

• [x]sync --target gemini symlinks skills and writes MCP servers to .gemini/settings.json
• [x]MCP servers merged into existing settings.json (same pattern as writer)
• [x]gemini added to validTargets in sync.ts
• [x]Tests for Gemini sync

Sync all

• [x]sync --target all syncs to all detected tools
• [x]Reuses same detection logic as install
• [x]Prints summary of what was synced where

Implementation

Phase 1: Tool Detection Utility

Create src/utils/detect-tools.ts

  name: string
  detected: boolean
  reason: string // e.g. "found ~/.codex/" or "not found"
}

  const home = os.homedir()
  const cwd = process.cwd()

  const checks: Array<{ name: string; paths: string[] }> = [
    { name: "opencode", paths: [path.join(home, ".config", "opencode"), path.join(cwd, ".opencode")] },
    { name: "codex", paths: [path.join(home, ".codex")] },
    { name: "droid", paths: [path.join(home, ".factory")] },
    { name: "cursor", paths: [path.join(cwd, ".cursor"), path.join(home, ".cursor")] },
    { name: "pi", paths: [path.join(home, ".pi")] },
    { name: "gemini", paths: [path.join(cwd, ".gemini"), path.join(home, ".gemini")] },
  ]

  const results: DetectedTool[] = []
  for (const check of checks) {
    let detected = false
    let reason = "not found"
    for (const p of check.paths) {
      if (await pathExists(p)) {
        detected = true
        reason = `found ${p}`
        break
      }
    }
    results.push({ name: check.name, detected, reason })
  }
  return results
}

  const tools = await detectInstalledTools()
  return tools.filter((t) => t.detected).map((t) => t.name)
}

Detection heuristics:

Phase 2: Gemini Sync

Create src/sync/gemini.ts

Follow the Cursor sync pattern (src/sync/cursor.ts) since both use JSON config with mcpServers key:

  skills: { name: string; sourceDir: string }[],
  mcpServers: Record<string, ClaudeMcpServer>,
  outputRoot: string,
): Promise<void> {
  const geminiDir = path.join(outputRoot, ".gemini")

  // Symlink skills
  if (skills.length > 0) {
    const skillsDir = path.join(geminiDir, "skills")
    await symlinkSkills(skills, skillsDir)
  }

  // Merge MCP servers into settings.json
  if (Object.keys(mcpServers).length > 0) {
    const settingsPath = path.join(geminiDir, "settings.json")
    let existing: Record<string, unknown> = {}
    if (await pathExists(settingsPath)) {
      await backupFile(settingsPath)
      try {
        existing = await readJson<Record<string, unknown>>(settingsPath)
      } catch {
        console.warn("Warning: existing settings.json could not be parsed and will be replaced.")
      }
    }

    const existingMcp = (existing.mcpServers && typeof existing.mcpServers === "object")
      ? existing.mcpServers as Record<string, unknown>
      : {}

    const merged = { ...existing, mcpServers: { ...existingMcp, ...convertMcpServers(mcpServers) } }
    await writeJson(settingsPath, merged)
  }
}

function convertMcpServers(servers: Record<string, ClaudeMcpServer>) {
  const result: Record<string, Record<string, unknown>> = {}
  for (const [name, server] of Object.entries(servers)) {
    const entry: Record<string, unknown> = {}
    if (server.command) {
      entry.command = server.command
      if (server.args?.length) entry.args = server.args
      if (server.env && Object.keys(server.env).length > 0) entry.env = server.env
    } else if (server.url) {
      entry.url = server.url
      if (server.headers && Object.keys(server.headers).length > 0) entry.headers = server.headers
    }
    result[name] = entry
  }
  return result
}

Update src/commands/sync.ts:

• Add "gemini" to validTargets array
• Import syncToGemini from ../sync/gemini
• Add case in switch for "gemini" calling syncToGemini(skills, mcpServers, outputRoot)

Phase 3: Wire --to all into Install and Convert

Modify src/commands/install.ts:

// In args definition, update --to description:
to: {
  type: "string",
  default: "opencode",
  description: "Target format (opencode | codex | droid | cursor | pi | gemini | all)",
},

// In run(), before the existing target lookup:
if (targetName === "all") {
  const detected = await detectInstalledTools()
  const activeTargets = detected.filter((t) => t.detected)

  if (activeTargets.length === 0) {
    console.log("No AI coding tools detected. Install at least one tool first.")
    return
  }

  console.log(`Detected ${activeTargets.length} tools:`)
  for (const tool of detected) {
    console.log(`  ${tool.detected ? "✓" : "✗"} ${tool.name} — ${tool.reason}`)
  }

  // Install to each detected target
  for (const tool of activeTargets) {
    const handler = targets[tool.name]
    const bundle = handler.convert(plugin, options)
    if (!bundle) continue
    const root = resolveTargetOutputRoot(tool.name, outputRoot, codexHome, piHome, hasExplicitOutput)
    await handler.write(root, bundle)
    console.log(`Installed ${plugin.manifest.name} to ${tool.name} at ${root}`)
  }

  // Codex post-processing
  if (activeTargets.some((t) => t.name === "codex")) {
    await ensureCodexAgentsFile(codexHome)
  }
  return
}

Same change in src/commands/convert.ts with its version of resolveTargetOutputRoot.

Phase 4: Wire --target all into Sync

Modify src/commands/sync.ts:

// Update validTargets:
const validTargets = ["opencode", "codex", "pi", "droid", "cursor", "gemini", "all"] as const

// In run(), handle "all":
if (targetName === "all") {
  const detected = await detectInstalledTools()
  const activeTargets = detected.filter((t) => t.detected).map((t) => t.name)

  if (activeTargets.length === 0) {
    console.log("No AI coding tools detected.")
    return
  }

  console.log(`Syncing to ${activeTargets.length} detected tools...`)
  for (const name of activeTargets) {
    // call existing sync logic for each target
  }
  return
}

Phase 5: Tests

Create tests/detect-tools.test.ts

• Test detection with mocked directories (create temp dirs, check detection)
• Test getDetectedTargetNames returns only detected tools
• Test empty detection returns empty array

Create tests/gemini-sync.test.ts

Follow tests/sync-cursor.test.ts pattern:

• Test skills are symlinked to .gemini/skills/
• Test MCP servers merged into settings.json
• Test existing settings.json is backed up
• Test empty skills/servers produce no output

Update tests/cli.test.ts

• Test --to all flag is accepted
• Test sync --target all is accepted
• Test sync --target gemini is accepted

Phase 6: Documentation

Update README.md:

Add to install section:

# auto-detect installed tools and install to all
bunx @every-env/compound-plugin install compound-engineering --to all

Add to sync section:

# Sync to Gemini
bunx @every-env/compound-plugin sync --target gemini

# Sync to all detected tools
bunx @every-env/compound-plugin sync --target all

What We're NOT Doing

• Not adding binary detection (which cursor, which gemini) — directory checks are sufficient and don't require shell execution
• Not adding interactive prompts ("Install to Cursor? y/n") — auto-detect is fire-and-forget
• Not adding --exclude flag for skipping specific targets — can use --to X --also Y for manual selection
• Not adding Gemini to the sync symlink watcher (no watcher exists for any target)

Complexity Assessment

Low-medium change. All patterns are established:

• Detection utility is new but simple (pathExists checks)
• Gemini sync follows cursor sync pattern exactly
• --to all is plumbing — iterate detected tools through existing handlers
• No new dependencies needed

References

• Cursor sync (reference pattern): src/sync/cursor.ts
• Gemini writer (merge pattern): src/targets/gemini.ts
• Install command: src/commands/install.ts
• Sync command: src/commands/sync.ts
• File utilities: src/utils/files.ts
• Symlink utilities: src/utils/symlink.ts

Completion Summary

What Was Delivered

• Tool detection utility (src/utils/detect-tools.ts) with detectInstalledTools() and getDetectedTargetNames()
• Gemini sync (src/sync/gemini.ts) following cursor sync pattern — symlinks skills, merges MCP servers into settings.json
• install --to all and convert --to all auto-detect and install to all detected tools
• sync --target gemini added to sync command
• sync --target all syncs to all detected tools with summary output
• 8 new tests across 2 test files (detect-tools + sync-gemini)

Implementation Statistics

• 4 new files, 3 modified files
• 139 tests passing (8 new + 131 existing)
• No new dependencies

Git Commits

• e4d730d feat: add detect-tools utility and Gemini sync with tests
• bc655f7 feat: wire --to all into install/convert and --target all/gemini into sync
• 877e265 docs: add auto-detect and Gemini sync to README, bump to 0.8.0

Completion Details

• Completed By: Claude Opus 4.6
• Date: 2026-02-14
• Session: Single session, TDD approach