feat(sync): add Claude home sync parity across providers

tests/sync-droid.test.ts

@@ -6,7 +6,7 @@ import { syncToDroid } from "../src/sync/droid"
 import type { ClaudeHomeConfig } from "../src/parsers/claude-home"
 
 describe("syncToDroid", () => {
-  test("symlinks skills to factory skills dir", async () => {
+  test("symlinks skills to factory skills dir and writes mcp.json", async () => {
     const tempRoot = await fs.mkdtemp(path.join(os.tmpdir(), "sync-droid-"))
     const fixtureSkillDir = path.join(import.meta.dir, "fixtures", "sample-plugin", "skills", "skill-one")
 
@@ -29,9 +29,49 @@ describe("syncToDroid", () => {
     const linkedStat = await fs.lstat(linkedSkillPath)
     expect(linkedStat.isSymbolicLink()).toBe(true)
 
-    // Droid does not write MCP config
-    const mcpExists = await fs.access(path.join(tempRoot, "mcp.json")).then(() => true).catch(() => false)
-    expect(mcpExists).toBe(false)
+    const mcpConfig = JSON.parse(
+      await fs.readFile(path.join(tempRoot, "mcp.json"), "utf8"),
+    ) as {
+      mcpServers: Record<string, { type: string; url?: string; disabled: boolean }>
+    }
+    expect(mcpConfig.mcpServers.context7?.type).toBe("http")
+    expect(mcpConfig.mcpServers.context7?.url).toBe("https://mcp.context7.com/mcp")
+    expect(mcpConfig.mcpServers.context7?.disabled).toBe(false)
+  })
+
+  test("merges existing mcp.json and overwrites same-named servers from Claude", async () => {
+    const tempRoot = await fs.mkdtemp(path.join(os.tmpdir(), "sync-droid-merge-"))
+    await fs.writeFile(
+      path.join(tempRoot, "mcp.json"),
+      JSON.stringify({
+        theme: "dark",
+        mcpServers: {
+          shared: { type: "http", url: "https://old.example.com", disabled: true },
+          existing: { type: "stdio", command: "node", disabled: false },
+        },
+      }, null, 2),
+    )
+
+    const config: ClaudeHomeConfig = {
+      skills: [],
+      mcpServers: {
+        shared: { url: "https://new.example.com" },
+      },
+    }
+
+    await syncToDroid(config, tempRoot)
+
+    const mcpConfig = JSON.parse(
+      await fs.readFile(path.join(tempRoot, "mcp.json"), "utf8"),
+    ) as {
+      theme: string
+      mcpServers: Record<string, { type: string; url?: string; command?: string; disabled: boolean }>
+    }
+
+    expect(mcpConfig.theme).toBe("dark")
+    expect(mcpConfig.mcpServers.existing?.command).toBe("node")
+    expect(mcpConfig.mcpServers.shared?.url).toBe("https://new.example.com")
+    expect(mcpConfig.mcpServers.shared?.disabled).toBe(false)
   })
 
   test("skips skills with invalid names", async () => {