feat: unwrap uworktree namespace to flat exports + barrel (#22717)

2 files changed, 599 insertions, 600 deletions

diff --git a/packages/opencode/src/worktree/index.ts b/packages/opencode/src/worktree/index.ts
index 14a3a0dc9..39bf94d69 100644
--- a/packages/opencode/src/worktree/index.ts
+++ b/packages/opencode/src/worktree/index.ts
@@ -1,600 +1 @@
-import z from "zod"
-import { NamedError } from "@opencode-ai/shared/util/error"
-import { Global } from "../global"
-import { Instance } from "../project/instance"
-import { InstanceBootstrap } from "../project/bootstrap"
-import { Project } from "../project/project"
-import { Database, eq } from "../storage/db"
-import { ProjectTable } from "../project/project.sql"
-import type { ProjectID } from "../project/schema"
-import { Log } from "../util/log"
-import { Slug } from "@opencode-ai/shared/util/slug"
-import { errorMessage } from "../util/error"
-import { BusEvent } from "@/bus/bus-event"
-import { GlobalBus } from "@/bus/global"
-import { Git } from "@/git"
-import { Effect, Layer, Path, Scope, Context, Stream } from "effect"
-import { ChildProcess, ChildProcessSpawner } from "effect/unstable/process"
-import { NodePath } from "@effect/platform-node"
-import { AppFileSystem } from "@opencode-ai/shared/filesystem"
-import { BootstrapRuntime } from "@/effect/bootstrap-runtime"
-import * as CrossSpawnSpawner from "@/effect/cross-spawn-spawner"
-import { InstanceState } from "@/effect/instance-state"
-
-export namespace Worktree {
-  const log = Log.create({ service: "worktree" })
-
-  export const Event = {
-    Ready: BusEvent.define(
-      "worktree.ready",
-      z.object({
-        name: z.string(),
-        branch: z.string(),
-      }),
-    ),
-    Failed: BusEvent.define(
-      "worktree.failed",
-      z.object({
-        message: z.string(),
-      }),
-    ),
-  }
-
-  export const Info = z
-    .object({
-      name: z.string(),
-      branch: z.string(),
-      directory: z.string(),
-    })
-    .meta({
-      ref: "Worktree",
-    })
-
-  export type Info = z.infer<typeof Info>
-
-  export const CreateInput = z
-    .object({
-      name: z.string().optional(),
-      startCommand: z
-        .string()
-        .optional()
-        .describe("Additional startup script to run after the project's start command"),
-    })
-    .meta({
-      ref: "WorktreeCreateInput",
-    })
-
-  export type CreateInput = z.infer<typeof CreateInput>
-
-  export const RemoveInput = z
-    .object({
-      directory: z.string(),
-    })
-    .meta({
-      ref: "WorktreeRemoveInput",
-    })
-
-  export type RemoveInput = z.infer<typeof RemoveInput>
-
-  export const ResetInput = z
-    .object({
-      directory: z.string(),
-    })
-    .meta({
-      ref: "WorktreeResetInput",
-    })
-
-  export type ResetInput = z.infer<typeof ResetInput>
-
-  export const NotGitError = NamedError.create(
-    "WorktreeNotGitError",
-    z.object({
-      message: z.string(),
-    }),
-  )
-
-  export const NameGenerationFailedError = NamedError.create(
-    "WorktreeNameGenerationFailedError",
-    z.object({
-      message: z.string(),
-    }),
-  )
-
-  export const CreateFailedError = NamedError.create(
-    "WorktreeCreateFailedError",
-    z.object({
-      message: z.string(),
-    }),
-  )
-
-  export const StartCommandFailedError = NamedError.create(
-    "WorktreeStartCommandFailedError",
-    z.object({
-      message: z.string(),
-    }),
-  )
-
-  export const RemoveFailedError = NamedError.create(
-    "WorktreeRemoveFailedError",
-    z.object({
-      message: z.string(),
-    }),
-  )
-
-  export const ResetFailedError = NamedError.create(
-    "WorktreeResetFailedError",
-    z.object({
-      message: z.string(),
-    }),
-  )
-
-  function slugify(input: string) {
-    return input
-      .trim()
-      .toLowerCase()
-      .replace(/[^a-z0-9]+/g, "-")
-      .replace(/^-+/, "")
-      .replace(/-+$/, "")
-  }
-
-  function failedRemoves(...chunks: string[]) {
-    return chunks.filter(Boolean).flatMap((chunk) =>
-      chunk
-        .split("\n")
-        .map((line) => line.trim())
-        .flatMap((line) => {
-          const match = line.match(/^warning:\s+failed to remove\s+(.+):\s+/i)
-          if (!match) return []
-          const value = match[1]?.trim().replace(/^['"]|['"]$/g, "")
-          if (!value) return []
-          return [value]
-        }),
-    )
-  }
-
-  // ---------------------------------------------------------------------------
-  // Effect service
-  // ---------------------------------------------------------------------------
-
-  export interface Interface {
-    readonly makeWorktreeInfo: (name?: string) => Effect.Effect<Info>
-    readonly createFromInfo: (info: Info, startCommand?: string) => Effect.Effect<void>
-    readonly create: (input?: CreateInput) => Effect.Effect<Info>
-    readonly remove: (input: RemoveInput) => Effect.Effect<boolean>
-    readonly reset: (input: ResetInput) => Effect.Effect<boolean>
-  }
-
-  export class Service extends Context.Service<Service, Interface>()("@opencode/Worktree") {}
-
-  type GitResult = { code: number; text: string; stderr: string }
-
-  export const layer: Layer.Layer<
-    Service,
-    never,
-    AppFileSystem.Service | Path.Path | ChildProcessSpawner.ChildProcessSpawner | Git.Service | Project.Service
-  > = Layer.effect(
-    Service,
-    Effect.gen(function* () {
-      const scope = yield* Scope.Scope
-      const fs = yield* AppFileSystem.Service
-      const pathSvc = yield* Path.Path
-      const spawner = yield* ChildProcessSpawner.ChildProcessSpawner
-      const gitSvc = yield* Git.Service
-      const project = yield* Project.Service
-
-      const git = Effect.fnUntraced(
-        function* (args: string[], opts?: { cwd?: string }) {
-          const handle = yield* spawner.spawn(
-            ChildProcess.make("git", args, { cwd: opts?.cwd, extendEnv: true, stdin: "ignore" }),
-          )
-          const [text, stderr] = yield* Effect.all(
-            [Stream.mkString(Stream.decodeText(handle.stdout)), Stream.mkString(Stream.decodeText(handle.stderr))],
-            { concurrency: 2 },
-          )
-          const code = yield* handle.exitCode
-          return { code, text, stderr } satisfies GitResult
-        },
-        Effect.scoped,
-        Effect.catch((e) =>
-          Effect.succeed({ code: 1, text: "", stderr: e instanceof Error ? e.message : String(e) } satisfies GitResult),
-        ),
-      )
-
-      const MAX_NAME_ATTEMPTS = 26
-      const candidate = Effect.fn("Worktree.candidate")(function* (root: string, base?: string) {
-        const ctx = yield* InstanceState.context
-        for (const attempt of Array.from({ length: MAX_NAME_ATTEMPTS }, (_, i) => i)) {
-          const name = base ? (attempt === 0 ? base : `${base}-${Slug.create()}`) : Slug.create()
-          const branch = `opencode/${name}`
-          const directory = pathSvc.join(root, name)
-
-          if (yield* fs.exists(directory).pipe(Effect.orDie)) continue
-
-          const ref = `refs/heads/${branch}`
-          const branchCheck = yield* git(["show-ref", "--verify", "--quiet", ref], { cwd: ctx.worktree })
-          if (branchCheck.code === 0) continue
-
-          return Info.parse({ name, branch, directory })
-        }
-        throw new NameGenerationFailedError({ message: "Failed to generate a unique worktree name" })
-      })
-
-      const makeWorktreeInfo = Effect.fn("Worktree.makeWorktreeInfo")(function* (name?: string) {
-        const ctx = yield* InstanceState.context
-        if (ctx.project.vcs !== "git") {
-          throw new NotGitError({ message: "Worktrees are only supported for git projects" })
-        }
-
-        const root = pathSvc.join(Global.Path.data, "worktree", ctx.project.id)
-        yield* fs.makeDirectory(root, { recursive: true }).pipe(Effect.orDie)
-
-        const base = name ? slugify(name) : ""
-        return yield* candidate(root, base || undefined)
-      })
-
-      const setup = Effect.fnUntraced(function* (info: Info) {
-        const ctx = yield* InstanceState.context
-        const created = yield* git(["worktree", "add", "--no-checkout", "-b", info.branch, info.directory], {
-          cwd: ctx.worktree,
-        })
-        if (created.code !== 0) {
-          throw new CreateFailedError({ message: created.stderr || created.text || "Failed to create git worktree" })
-        }
-
-        yield* project.addSandbox(ctx.project.id, info.directory).pipe(Effect.catch(() => Effect.void))
-      })
-
-      const boot = Effect.fnUntraced(function* (info: Info, startCommand?: string) {
-        const ctx = yield* InstanceState.context
-        const workspaceID = yield* InstanceState.workspaceID
-        const projectID = ctx.project.id
-        const extra = startCommand?.trim()
-
-        const populated = yield* git(["reset", "--hard"], { cwd: info.directory })
-        if (populated.code !== 0) {
-          const message = populated.stderr || populated.text || "Failed to populate worktree"
-          log.error("worktree checkout failed", { directory: info.directory, message })
-          GlobalBus.emit("event", {
-            directory: info.directory,
-            project: ctx.project.id,
-            workspace: workspaceID,
-            payload: { type: Event.Failed.type, properties: { message } },
-          })
-          return
-        }
-
-        const booted = yield* Effect.promise(() =>
-          Instance.provide({
-            directory: info.directory,
-            init: () => BootstrapRuntime.runPromise(InstanceBootstrap),
-            fn: () => undefined,
-          })
-            .then(() => true)
-            .catch((error) => {
-              const message = errorMessage(error)
-              log.error("worktree bootstrap failed", { directory: info.directory, message })
-              GlobalBus.emit("event", {
-                directory: info.directory,
-                project: ctx.project.id,
-                workspace: workspaceID,
-                payload: { type: Event.Failed.type, properties: { message } },
-              })
-              return false
-            }),
-        )
-        if (!booted) return
-
-        GlobalBus.emit("event", {
-          directory: info.directory,
-          project: ctx.project.id,
-          workspace: workspaceID,
-          payload: {
-            type: Event.Ready.type,
-            properties: { name: info.name, branch: info.branch },
-          },
-        })
-
-        yield* runStartScripts(info.directory, { projectID, extra })
-      })
-
-      const createFromInfo = Effect.fn("Worktree.createFromInfo")(function* (info: Info, startCommand?: string) {
-        yield* setup(info)
-        yield* boot(info, startCommand)
-      })
-
-      const create = Effect.fn("Worktree.create")(function* (input?: CreateInput) {
-        const info = yield* makeWorktreeInfo(input?.name)
-        yield* setup(info)
-        yield* boot(info, input?.startCommand).pipe(
-          Effect.catchCause((cause) => Effect.sync(() => log.error("worktree bootstrap failed", { cause }))),
-          Effect.forkIn(scope),
-        )
-        return info
-      })
-
-      const canonical = Effect.fnUntraced(function* (input: string) {
-        const abs = pathSvc.resolve(input)
-        const real = yield* fs.realPath(abs).pipe(Effect.catch(() => Effect.succeed(abs)))
-        const normalized = pathSvc.normalize(real)
-        return process.platform === "win32" ? normalized.toLowerCase() : normalized
-      })
-
-      function parseWorktreeList(text: string) {
-        return text
-          .split("\n")
-          .map((line) => line.trim())
-          .reduce<{ path?: string; branch?: string }[]>((acc, line) => {
-            if (!line) return acc
-            if (line.startsWith("worktree ")) {
-              acc.push({ path: line.slice("worktree ".length).trim() })
-              return acc
-            }
-            const current = acc[acc.length - 1]
-            if (!current) return acc
-            if (line.startsWith("branch ")) {
-              current.branch = line.slice("branch ".length).trim()
-            }
-            return acc
-          }, [])
-      }
-
-      const locateWorktree = Effect.fnUntraced(function* (
-        entries: { path?: string; branch?: string }[],
-        directory: string,
-      ) {
-        for (const item of entries) {
-          if (!item.path) continue
-          const key = yield* canonical(item.path)
-          if (key === directory) return item
-        }
-        return undefined
-      })
-
-      function stopFsmonitor(target: string) {
-        return fs.exists(target).pipe(
-          Effect.orDie,
-          Effect.flatMap((exists) => (exists ? git(["fsmonitor--daemon", "stop"], { cwd: target }) : Effect.void)),
-        )
-      }
-
-      function cleanDirectory(target: string) {
-        return Effect.promise(() =>
-          import("fs/promises")
-            .then((fsp) => fsp.rm(target, { recursive: true, force: true, maxRetries: 5, retryDelay: 100 }))
-            .catch((error) => {
-              const message = errorMessage(error)
-              throw new RemoveFailedError({ message: message || "Failed to remove git worktree directory" })
-            }),
-        )
-      }
-
-      const remove = Effect.fn("Worktree.remove")(function* (input: RemoveInput) {
-        if (Instance.project.vcs !== "git") {
-          throw new NotGitError({ message: "Worktrees are only supported for git projects" })
-        }
-
-        const directory = yield* canonical(input.directory)
-
-        const list = yield* git(["worktree", "list", "--porcelain"], { cwd: Instance.worktree })
-        if (list.code !== 0) {
-          throw new RemoveFailedError({ message: list.stderr || list.text || "Failed to read git worktrees" })
-        }
-
-        const entries = parseWorktreeList(list.text)
-        const entry = yield* locateWorktree(entries, directory)
-
-        if (!entry?.path) {
-          const directoryExists = yield* fs.exists(directory).pipe(Effect.orDie)
-          if (directoryExists) {
-            yield* stopFsmonitor(directory)
-            yield* cleanDirectory(directory)
-          }
-          return true
-        }
-
-        yield* stopFsmonitor(entry.path)
-        const removed = yield* git(["worktree", "remove", "--force", entry.path], { cwd: Instance.worktree })
-        if (removed.code !== 0) {
-          const next = yield* git(["worktree", "list", "--porcelain"], { cwd: Instance.worktree })
-          if (next.code !== 0) {
-            throw new RemoveFailedError({
-              message: removed.stderr || removed.text || next.stderr || next.text || "Failed to remove git worktree",
-            })
-          }
-
-          const stale = yield* locateWorktree(parseWorktreeList(next.text), directory)
-          if (stale?.path) {
-            throw new RemoveFailedError({ message: removed.stderr || removed.text || "Failed to remove git worktree" })
-          }
-        }
-
-        yield* cleanDirectory(entry.path)
-
-        const branch = entry.branch?.replace(/^refs\/heads\//, "")
-        if (branch) {
-          const deleted = yield* git(["branch", "-D", branch], { cwd: Instance.worktree })
-          if (deleted.code !== 0) {
-            throw new RemoveFailedError({
-              message: deleted.stderr || deleted.text || "Failed to delete worktree branch",
-            })
-          }
-        }
-
-        return true
-      })
-
-      const gitExpect = Effect.fnUntraced(function* (
-        args: string[],
-        opts: { cwd: string },
-        error: (r: GitResult) => Error,
-      ) {
-        const result = yield* git(args, opts)
-        if (result.code !== 0) throw error(result)
-        return result
-      })
-
-      const runStartCommand = Effect.fnUntraced(
-        function* (directory: string, cmd: string) {
-          const [shell, args] = process.platform === "win32" ? ["cmd", ["/c", cmd]] : ["bash", ["-lc", cmd]]
-          const handle = yield* spawner.spawn(
-            ChildProcess.make(shell, args, { cwd: directory, extendEnv: true, stdin: "ignore" }),
-          )
-          // Drain stdout, capture stderr for error reporting
-          const [, stderr] = yield* Effect.all(
-            [Stream.runDrain(handle.stdout), Stream.mkString(Stream.decodeText(handle.stderr))],
-            { concurrency: 2 },
-          ).pipe(Effect.orDie)
-          const code = yield* handle.exitCode
-          return { code, stderr }
-        },
-        Effect.scoped,
-        Effect.catch(() => Effect.succeed({ code: 1, stderr: "" })),
-      )
-
-      const runStartScript = Effect.fnUntraced(function* (directory: string, cmd: string, kind: string) {
-        const text = cmd.trim()
-        if (!text) return true
-        const result = yield* runStartCommand(directory, text)
-        if (result.code === 0) return true
-        log.error("worktree start command failed", { kind, directory, message: result.stderr })
-        return false
-      })
-
-      const runStartScripts = Effect.fnUntraced(function* (
-        directory: string,
-        input: { projectID: ProjectID; extra?: string },
-      ) {
-        const row = yield* Effect.sync(() =>
-          Database.use((db) => db.select().from(ProjectTable).where(eq(ProjectTable.id, input.projectID)).get()),
-        )
-        const project = row ? Project.fromRow(row) : undefined
-        const startup = project?.commands?.start?.trim() ?? ""
-        const ok = yield* runStartScript(directory, startup, "project")
-        if (!ok) return false
-        yield* runStartScript(directory, input.extra ?? "", "worktree")
-        return true
-      })
-
-      const prune = Effect.fnUntraced(function* (root: string, entries: string[]) {
-        const base = yield* canonical(root)
-        yield* Effect.forEach(
-          entries,
-          (entry) =>
-            Effect.gen(function* () {
-              const target = yield* canonical(pathSvc.resolve(root, entry))
-              if (target === base) return
-              if (!target.startsWith(`${base}${pathSvc.sep}`)) return
-              yield* fs.remove(target, { recursive: true }).pipe(Effect.ignore)
-            }),
-          { concurrency: "unbounded" },
-        )
-      })
-
-      const sweep = Effect.fnUntraced(function* (root: string) {
-        const first = yield* git(["clean", "-ffdx"], { cwd: root })
-        if (first.code === 0) return first
-
-        const entries = failedRemoves(first.stderr, first.text)
-        if (!entries.length) return first
-
-        yield* prune(root, entries)
-        return yield* git(["clean", "-ffdx"], { cwd: root })
-      })
-
-      const reset = Effect.fn("Worktree.reset")(function* (input: ResetInput) {
-        if (Instance.project.vcs !== "git") {
-          throw new NotGitError({ message: "Worktrees are only supported for git projects" })
-        }
-
-        const directory = yield* canonical(input.directory)
-        const primary = yield* canonical(Instance.worktree)
-        if (directory === primary) {
-          throw new ResetFailedError({ message: "Cannot reset the primary workspace" })
-        }
-
-        const list = yield* git(["worktree", "list", "--porcelain"], { cwd: Instance.worktree })
-        if (list.code !== 0) {
-          throw new ResetFailedError({ message: list.stderr || list.text || "Failed to read git worktrees" })
-        }
-
-        const entry = yield* locateWorktree(parseWorktreeList(list.text), directory)
-        if (!entry?.path) {
-          throw new ResetFailedError({ message: "Worktree not found" })
-        }
-
-        const worktreePath = entry.path
-
-        const base = yield* gitSvc.defaultBranch(Instance.worktree)
-        if (!base) {
-          throw new ResetFailedError({ message: "Default branch not found" })
-        }
-
-        const sep = base.ref.indexOf("/")
-        if (base.ref !== base.name && sep > 0) {
-          const remote = base.ref.slice(0, sep)
-          const branch = base.ref.slice(sep + 1)
-          yield* gitExpect(
-            ["fetch", remote, branch],
-            { cwd: Instance.worktree },
-            (r) => new ResetFailedError({ message: r.stderr || r.text || `Failed to fetch ${base.ref}` }),
-          )
-        }
-
-        yield* gitExpect(
-          ["reset", "--hard", base.ref],
-          { cwd: worktreePath },
-          (r) => new ResetFailedError({ message: r.stderr || r.text || "Failed to reset worktree to target" }),
-        )
-
-        const cleanResult = yield* sweep(worktreePath)
-        if (cleanResult.code !== 0) {
-          throw new ResetFailedError({ message: cleanResult.stderr || cleanResult.text || "Failed to clean worktree" })
-        }
-
-        yield* gitExpect(
-          ["submodule", "update", "--init", "--recursive", "--force"],
-          { cwd: worktreePath },
-          (r) => new ResetFailedError({ message: r.stderr || r.text || "Failed to update submodules" }),
-        )
-
-        yield* gitExpect(
-          ["submodule", "foreach", "--recursive", "git", "reset", "--hard"],
-          { cwd: worktreePath },
-          (r) => new ResetFailedError({ message: r.stderr || r.text || "Failed to reset submodules" }),
-        )
-
-        yield* gitExpect(
-          ["submodule", "foreach", "--recursive", "git", "clean", "-fdx"],
-          { cwd: worktreePath },
-          (r) => new ResetFailedError({ message: r.stderr || r.text || "Failed to clean submodules" }),
-        )
-
-        const status = yield* git(["-c", "core.fsmonitor=false", "status", "--porcelain=v1"], { cwd: worktreePath })
-        if (status.code !== 0) {
-          throw new ResetFailedError({ message: status.stderr || status.text || "Failed to read git status" })
-        }
-
-        if (status.text.trim()) {
-          throw new ResetFailedError({ message: `Worktree reset left local changes:\n${status.text.trim()}` })
-        }
-
-        yield* runStartScripts(worktreePath, { projectID: Instance.project.id }).pipe(
-          Effect.catchCause((cause) => Effect.sync(() => log.error("worktree start task failed", { cause }))),
-          Effect.forkIn(scope),
-        )
-
-        return true
-      })
-
-      return Service.of({ makeWorktreeInfo, createFromInfo, create, remove, reset })
-    }),
-  )
-
-  export const defaultLayer = layer.pipe(
-    Layer.provide(Git.defaultLayer),
-    Layer.provide(CrossSpawnSpawner.defaultLayer),
-    Layer.provide(Project.defaultLayer),
-    Layer.provide(AppFileSystem.defaultLayer),
-    Layer.provide(NodePath.layer),
-  )
-}
+export * as Worktree from "./worktree"
diff --git a/packages/opencode/src/worktree/worktree.ts b/packages/opencode/src/worktree/worktree.ts
new file mode 100644
index 000000000..9280b7a52
--- /dev/null
+++ b/packages/opencode/src/worktree/worktree.ts
@@ -0,0 +1,598 @@
+import z from "zod"
+import { NamedError } from "@opencode-ai/shared/util/error"
+import { Global } from "../global"
+import { Instance } from "../project/instance"
+import { InstanceBootstrap } from "../project/bootstrap"
+import { Project } from "../project/project"
+import { Database, eq } from "../storage/db"
+import { ProjectTable } from "../project/project.sql"
+import type { ProjectID } from "../project/schema"
+import { Log } from "../util/log"
+import { Slug } from "@opencode-ai/shared/util/slug"
+import { errorMessage } from "../util/error"
+import { BusEvent } from "@/bus/bus-event"
+import { GlobalBus } from "@/bus/global"
+import { Git } from "@/git"
+import { Effect, Layer, Path, Scope, Context, Stream } from "effect"
+import { ChildProcess, ChildProcessSpawner } from "effect/unstable/process"
+import { NodePath } from "@effect/platform-node"
+import { AppFileSystem } from "@opencode-ai/shared/filesystem"
+import { BootstrapRuntime } from "@/effect/bootstrap-runtime"
+import * as CrossSpawnSpawner from "@/effect/cross-spawn-spawner"
+import { InstanceState } from "@/effect/instance-state"
+
+const log = Log.create({ service: "worktree" })
+
+export const Event = {
+  Ready: BusEvent.define(
+    "worktree.ready",
+    z.object({
+      name: z.string(),
+      branch: z.string(),
+    }),
+  ),
+  Failed: BusEvent.define(
+    "worktree.failed",
+    z.object({
+      message: z.string(),
+    }),
+  ),
+}
+
+export const Info = z
+  .object({
+    name: z.string(),
+    branch: z.string(),
+    directory: z.string(),
+  })
+  .meta({
+    ref: "Worktree",
+  })
+
+export type Info = z.infer<typeof Info>
+
+export const CreateInput = z
+  .object({
+    name: z.string().optional(),
+    startCommand: z
+      .string()
+      .optional()
+      .describe("Additional startup script to run after the project's start command"),
+  })
+  .meta({
+    ref: "WorktreeCreateInput",
+  })
+
+export type CreateInput = z.infer<typeof CreateInput>
+
+export const RemoveInput = z
+  .object({
+    directory: z.string(),
+  })
+  .meta({
+    ref: "WorktreeRemoveInput",
+  })
+
+export type RemoveInput = z.infer<typeof RemoveInput>
+
+export const ResetInput = z
+  .object({
+    directory: z.string(),
+  })
+  .meta({
+    ref: "WorktreeResetInput",
+  })
+
+export type ResetInput = z.infer<typeof ResetInput>
+
+export const NotGitError = NamedError.create(
+  "WorktreeNotGitError",
+  z.object({
+    message: z.string(),
+  }),
+)
+
+export const NameGenerationFailedError = NamedError.create(
+  "WorktreeNameGenerationFailedError",
+  z.object({
+    message: z.string(),
+  }),
+)
+
+export const CreateFailedError = NamedError.create(
+  "WorktreeCreateFailedError",
+  z.object({
+    message: z.string(),
+  }),
+)
+
+export const StartCommandFailedError = NamedError.create(
+  "WorktreeStartCommandFailedError",
+  z.object({
+    message: z.string(),
+  }),
+)
+
+export const RemoveFailedError = NamedError.create(
+  "WorktreeRemoveFailedError",
+  z.object({
+    message: z.string(),
+  }),
+)
+
+export const ResetFailedError = NamedError.create(
+  "WorktreeResetFailedError",
+  z.object({
+    message: z.string(),
+  }),
+)
+
+function slugify(input: string) {
+  return input
+    .trim()
+    .toLowerCase()
+    .replace(/[^a-z0-9]+/g, "-")
+    .replace(/^-+/, "")
+    .replace(/-+$/, "")
+}
+
+function failedRemoves(...chunks: string[]) {
+  return chunks.filter(Boolean).flatMap((chunk) =>
+    chunk
+      .split("\n")
+      .map((line) => line.trim())
+      .flatMap((line) => {
+        const match = line.match(/^warning:\s+failed to remove\s+(.+):\s+/i)
+        if (!match) return []
+        const value = match[1]?.trim().replace(/^['"]|['"]$/g, "")
+        if (!value) return []
+        return [value]
+      }),
+  )
+}
+
+// ---------------------------------------------------------------------------
+// Effect service
+// ---------------------------------------------------------------------------
+
+export interface Interface {
+  readonly makeWorktreeInfo: (name?: string) => Effect.Effect<Info>
+  readonly createFromInfo: (info: Info, startCommand?: string) => Effect.Effect<void>
+  readonly create: (input?: CreateInput) => Effect.Effect<Info>
+  readonly remove: (input: RemoveInput) => Effect.Effect<boolean>
+  readonly reset: (input: ResetInput) => Effect.Effect<boolean>
+}
+
+export class Service extends Context.Service<Service, Interface>()("@opencode/Worktree") {}
+
+type GitResult = { code: number; text: string; stderr: string }
+
+export const layer: Layer.Layer<
+  Service,
+  never,
+  AppFileSystem.Service | Path.Path | ChildProcessSpawner.ChildProcessSpawner | Git.Service | Project.Service
+> = Layer.effect(
+  Service,
+  Effect.gen(function* () {
+    const scope = yield* Scope.Scope
+    const fs = yield* AppFileSystem.Service
+    const pathSvc = yield* Path.Path
+    const spawner = yield* ChildProcessSpawner.ChildProcessSpawner
+    const gitSvc = yield* Git.Service
+    const project = yield* Project.Service
+
+    const git = Effect.fnUntraced(
+      function* (args: string[], opts?: { cwd?: string }) {
+        const handle = yield* spawner.spawn(
+          ChildProcess.make("git", args, { cwd: opts?.cwd, extendEnv: true, stdin: "ignore" }),
+        )
+        const [text, stderr] = yield* Effect.all(
+          [Stream.mkString(Stream.decodeText(handle.stdout)), Stream.mkString(Stream.decodeText(handle.stderr))],
+          { concurrency: 2 },
+        )
+        const code = yield* handle.exitCode
+        return { code, text, stderr } satisfies GitResult
+      },
+      Effect.scoped,
+      Effect.catch((e) =>
+        Effect.succeed({ code: 1, text: "", stderr: e instanceof Error ? e.message : String(e) } satisfies GitResult),
+      ),
+    )
+
+    const MAX_NAME_ATTEMPTS = 26
+    const candidate = Effect.fn("Worktree.candidate")(function* (root: string, base?: string) {
+      const ctx = yield* InstanceState.context
+      for (const attempt of Array.from({ length: MAX_NAME_ATTEMPTS }, (_, i) => i)) {
+        const name = base ? (attempt === 0 ? base : `${base}-${Slug.create()}`) : Slug.create()
+        const branch = `opencode/${name}`
+        const directory = pathSvc.join(root, name)
+
+        if (yield* fs.exists(directory).pipe(Effect.orDie)) continue
+
+        const ref = `refs/heads/${branch}`
+        const branchCheck = yield* git(["show-ref", "--verify", "--quiet", ref], { cwd: ctx.worktree })
+        if (branchCheck.code === 0) continue
+
+        return Info.parse({ name, branch, directory })
+      }
+      throw new NameGenerationFailedError({ message: "Failed to generate a unique worktree name" })
+    })
+
+    const makeWorktreeInfo = Effect.fn("Worktree.makeWorktreeInfo")(function* (name?: string) {
+      const ctx = yield* InstanceState.context
+      if (ctx.project.vcs !== "git") {
+        throw new NotGitError({ message: "Worktrees are only supported for git projects" })
+      }
+
+      const root = pathSvc.join(Global.Path.data, "worktree", ctx.project.id)
+      yield* fs.makeDirectory(root, { recursive: true }).pipe(Effect.orDie)
+
+      const base = name ? slugify(name) : ""
+      return yield* candidate(root, base || undefined)
+    })
+
+    const setup = Effect.fnUntraced(function* (info: Info) {
+      const ctx = yield* InstanceState.context
+      const created = yield* git(["worktree", "add", "--no-checkout", "-b", info.branch, info.directory], {
+        cwd: ctx.worktree,
+      })
+      if (created.code !== 0) {
+        throw new CreateFailedError({ message: created.stderr || created.text || "Failed to create git worktree" })
+      }
+
+      yield* project.addSandbox(ctx.project.id, info.directory).pipe(Effect.catch(() => Effect.void))
+    })
+
+    const boot = Effect.fnUntraced(function* (info: Info, startCommand?: string) {
+      const ctx = yield* InstanceState.context
+      const workspaceID = yield* InstanceState.workspaceID
+      const projectID = ctx.project.id
+      const extra = startCommand?.trim()
+
+      const populated = yield* git(["reset", "--hard"], { cwd: info.directory })
+      if (populated.code !== 0) {
+        const message = populated.stderr || populated.text || "Failed to populate worktree"
+        log.error("worktree checkout failed", { directory: info.directory, message })
+        GlobalBus.emit("event", {
+          directory: info.directory,
+          project: ctx.project.id,
+          workspace: workspaceID,
+          payload: { type: Event.Failed.type, properties: { message } },
+        })
+        return
+      }
+
+      const booted = yield* Effect.promise(() =>
+        Instance.provide({
+          directory: info.directory,
+          init: () => BootstrapRuntime.runPromise(InstanceBootstrap),
+          fn: () => undefined,
+        })
+          .then(() => true)
+          .catch((error) => {
+            const message = errorMessage(error)
+            log.error("worktree bootstrap failed", { directory: info.directory, message })
+            GlobalBus.emit("event", {
+              directory: info.directory,
+              project: ctx.project.id,
+              workspace: workspaceID,
+              payload: { type: Event.Failed.type, properties: { message } },
+            })
+            return false
+          }),
+      )
+      if (!booted) return
+
+      GlobalBus.emit("event", {
+        directory: info.directory,
+        project: ctx.project.id,
+        workspace: workspaceID,
+        payload: {
+          type: Event.Ready.type,
+          properties: { name: info.name, branch: info.branch },
+        },
+      })
+
+      yield* runStartScripts(info.directory, { projectID, extra })
+    })
+
+    const createFromInfo = Effect.fn("Worktree.createFromInfo")(function* (info: Info, startCommand?: string) {
+      yield* setup(info)
+      yield* boot(info, startCommand)
+    })
+
+    const create = Effect.fn("Worktree.create")(function* (input?: CreateInput) {
+      const info = yield* makeWorktreeInfo(input?.name)
+      yield* setup(info)
+      yield* boot(info, input?.startCommand).pipe(
+        Effect.catchCause((cause) => Effect.sync(() => log.error("worktree bootstrap failed", { cause }))),
+        Effect.forkIn(scope),
+      )
+      return info
+    })
+
+    const canonical = Effect.fnUntraced(function* (input: string) {
+      const abs = pathSvc.resolve(input)
+      const real = yield* fs.realPath(abs).pipe(Effect.catch(() => Effect.succeed(abs)))
+      const normalized = pathSvc.normalize(real)
+      return process.platform === "win32" ? normalized.toLowerCase() : normalized
+    })
+
+    function parseWorktreeList(text: string) {
+      return text
+        .split("\n")
+        .map((line) => line.trim())
+        .reduce<{ path?: string; branch?: string }[]>((acc, line) => {
+          if (!line) return acc
+          if (line.startsWith("worktree ")) {
+            acc.push({ path: line.slice("worktree ".length).trim() })
+            return acc
+          }
+          const current = acc[acc.length - 1]
+          if (!current) return acc
+          if (line.startsWith("branch ")) {
+            current.branch = line.slice("branch ".length).trim()
+          }
+          return acc
+        }, [])
+    }
+
+    const locateWorktree = Effect.fnUntraced(function* (
+      entries: { path?: string; branch?: string }[],
+      directory: string,
+    ) {
+      for (const item of entries) {
+        if (!item.path) continue
+        const key = yield* canonical(item.path)
+        if (key === directory) return item
+      }
+      return undefined
+    })
+
+    function stopFsmonitor(target: string) {
+      return fs.exists(target).pipe(
+        Effect.orDie,
+        Effect.flatMap((exists) => (exists ? git(["fsmonitor--daemon", "stop"], { cwd: target }) : Effect.void)),
+      )
+    }
+
+    function cleanDirectory(target: string) {
+      return Effect.promise(() =>
+        import("fs/promises")
+          .then((fsp) => fsp.rm(target, { recursive: true, force: true, maxRetries: 5, retryDelay: 100 }))
+          .catch((error) => {
+            const message = errorMessage(error)
+            throw new RemoveFailedError({ message: message || "Failed to remove git worktree directory" })
+          }),
+      )
+    }
+
+    const remove = Effect.fn("Worktree.remove")(function* (input: RemoveInput) {
+      if (Instance.project.vcs !== "git") {
+        throw new NotGitError({ message: "Worktrees are only supported for git projects" })
+      }
+
+      const directory = yield* canonical(input.directory)
+
+      const list = yield* git(["worktree", "list", "--porcelain"], { cwd: Instance.worktree })
+      if (list.code !== 0) {
+        throw new RemoveFailedError({ message: list.stderr || list.text || "Failed to read git worktrees" })
+      }
+
+      const entries = parseWorktreeList(list.text)
+      const entry = yield* locateWorktree(entries, directory)
+
+      if (!entry?.path) {
+        const directoryExists = yield* fs.exists(directory).pipe(Effect.orDie)
+        if (directoryExists) {
+          yield* stopFsmonitor(directory)
+          yield* cleanDirectory(directory)
+        }
+        return true
+      }
+
+      yield* stopFsmonitor(entry.path)
+      const removed = yield* git(["worktree", "remove", "--force", entry.path], { cwd: Instance.worktree })
+      if (removed.code !== 0) {
+        const next = yield* git(["worktree", "list", "--porcelain"], { cwd: Instance.worktree })
+        if (next.code !== 0) {
+          throw new RemoveFailedError({
+            message: removed.stderr || removed.text || next.stderr || next.text || "Failed to remove git worktree",
+          })
+        }
+
+        const stale = yield* locateWorktree(parseWorktreeList(next.text), directory)
+        if (stale?.path) {
+          throw new RemoveFailedError({ message: removed.stderr || removed.text || "Failed to remove git worktree" })
+        }
+      }
+
+      yield* cleanDirectory(entry.path)
+
+      const branch = entry.branch?.replace(/^refs\/heads\//, "")
+      if (branch) {
+        const deleted = yield* git(["branch", "-D", branch], { cwd: Instance.worktree })
+        if (deleted.code !== 0) {
+          throw new RemoveFailedError({
+            message: deleted.stderr || deleted.text || "Failed to delete worktree branch",
+          })
+        }
+      }
+
+      return true
+    })
+
+    const gitExpect = Effect.fnUntraced(function* (
+      args: string[],
+      opts: { cwd: string },
+      error: (r: GitResult) => Error,
+    ) {
+      const result = yield* git(args, opts)
+      if (result.code !== 0) throw error(result)
+      return result
+    })
+
+    const runStartCommand = Effect.fnUntraced(
+      function* (directory: string, cmd: string) {
+        const [shell, args] = process.platform === "win32" ? ["cmd", ["/c", cmd]] : ["bash", ["-lc", cmd]]
+        const handle = yield* spawner.spawn(
+          ChildProcess.make(shell, args, { cwd: directory, extendEnv: true, stdin: "ignore" }),
+        )
+        // Drain stdout, capture stderr for error reporting
+        const [, stderr] = yield* Effect.all(
+          [Stream.runDrain(handle.stdout), Stream.mkString(Stream.decodeText(handle.stderr))],
+          { concurrency: 2 },
+        ).pipe(Effect.orDie)
+        const code = yield* handle.exitCode
+        return { code, stderr }
+      },
+      Effect.scoped,
+      Effect.catch(() => Effect.succeed({ code: 1, stderr: "" })),
+    )
+
+    const runStartScript = Effect.fnUntraced(function* (directory: string, cmd: string, kind: string) {
+      const text = cmd.trim()
+      if (!text) return true
+      const result = yield* runStartCommand(directory, text)
+      if (result.code === 0) return true
+      log.error("worktree start command failed", { kind, directory, message: result.stderr })
+      return false
+    })
+
+    const runStartScripts = Effect.fnUntraced(function* (
+      directory: string,
+      input: { projectID: ProjectID; extra?: string },
+    ) {
+      const row = yield* Effect.sync(() =>
+        Database.use((db) => db.select().from(ProjectTable).where(eq(ProjectTable.id, input.projectID)).get()),
+      )
+      const project = row ? Project.fromRow(row) : undefined
+      const startup = project?.commands?.start?.trim() ?? ""
+      const ok = yield* runStartScript(directory, startup, "project")
+      if (!ok) return false
+      yield* runStartScript(directory, input.extra ?? "", "worktree")
+      return true
+    })
+
+    const prune = Effect.fnUntraced(function* (root: string, entries: string[]) {
+      const base = yield* canonical(root)
+      yield* Effect.forEach(
+        entries,
+        (entry) =>
+          Effect.gen(function* () {
+            const target = yield* canonical(pathSvc.resolve(root, entry))
+            if (target === base) return
+            if (!target.startsWith(`${base}${pathSvc.sep}`)) return
+            yield* fs.remove(target, { recursive: true }).pipe(Effect.ignore)
+          }),
+        { concurrency: "unbounded" },
+      )
+    })
+
+    const sweep = Effect.fnUntraced(function* (root: string) {
+      const first = yield* git(["clean", "-ffdx"], { cwd: root })
+      if (first.code === 0) return first
+
+      const entries = failedRemoves(first.stderr, first.text)
+      if (!entries.length) return first
+
+      yield* prune(root, entries)
+      return yield* git(["clean", "-ffdx"], { cwd: root })
+    })
+
+    const reset = Effect.fn("Worktree.reset")(function* (input: ResetInput) {
+      if (Instance.project.vcs !== "git") {
+        throw new NotGitError({ message: "Worktrees are only supported for git projects" })
+      }
+
+      const directory = yield* canonical(input.directory)
+      const primary = yield* canonical(Instance.worktree)
+      if (directory === primary) {
+        throw new ResetFailedError({ message: "Cannot reset the primary workspace" })
+      }
+
+      const list = yield* git(["worktree", "list", "--porcelain"], { cwd: Instance.worktree })
+      if (list.code !== 0) {
+        throw new ResetFailedError({ message: list.stderr || list.text || "Failed to read git worktrees" })
+      }
+
+      const entry = yield* locateWorktree(parseWorktreeList(list.text), directory)
+      if (!entry?.path) {
+        throw new ResetFailedError({ message: "Worktree not found" })
+      }
+
+      const worktreePath = entry.path
+
+      const base = yield* gitSvc.defaultBranch(Instance.worktree)
+      if (!base) {
+        throw new ResetFailedError({ message: "Default branch not found" })
+      }
+
+      const sep = base.ref.indexOf("/")
+      if (base.ref !== base.name && sep > 0) {
+        const remote = base.ref.slice(0, sep)
+        const branch = base.ref.slice(sep + 1)
+        yield* gitExpect(
+          ["fetch", remote, branch],
+          { cwd: Instance.worktree },
+          (r) => new ResetFailedError({ message: r.stderr || r.text || `Failed to fetch ${base.ref}` }),
+        )
+      }
+
+      yield* gitExpect(
+        ["reset", "--hard", base.ref],
+        { cwd: worktreePath },
+        (r) => new ResetFailedError({ message: r.stderr || r.text || "Failed to reset worktree to target" }),
+      )
+
+      const cleanResult = yield* sweep(worktreePath)
+      if (cleanResult.code !== 0) {
+        throw new ResetFailedError({ message: cleanResult.stderr || cleanResult.text || "Failed to clean worktree" })
+      }
+
+      yield* gitExpect(
+        ["submodule", "update", "--init", "--recursive", "--force"],
+        { cwd: worktreePath },
+        (r) => new ResetFailedError({ message: r.stderr || r.text || "Failed to update submodules" }),
+      )
+
+      yield* gitExpect(
+        ["submodule", "foreach", "--recursive", "git", "reset", "--hard"],
+        { cwd: worktreePath },
+        (r) => new ResetFailedError({ message: r.stderr || r.text || "Failed to reset submodules" }),
+      )
+
+      yield* gitExpect(
+        ["submodule", "foreach", "--recursive", "git", "clean", "-fdx"],
+        { cwd: worktreePath },
+        (r) => new ResetFailedError({ message: r.stderr || r.text || "Failed to clean submodules" }),
+      )
+
+      const status = yield* git(["-c", "core.fsmonitor=false", "status", "--porcelain=v1"], { cwd: worktreePath })
+      if (status.code !== 0) {
+        throw new ResetFailedError({ message: status.stderr || status.text || "Failed to read git status" })
+      }
+
+      if (status.text.trim()) {
+        throw new ResetFailedError({ message: `Worktree reset left local changes:\n${status.text.trim()}` })
+      }
+
+      yield* runStartScripts(worktreePath, { projectID: Instance.project.id }).pipe(
+        Effect.catchCause((cause) => Effect.sync(() => log.error("worktree start task failed", { cause }))),
+        Effect.forkIn(scope),
+      )
+
+      return true
+    })
+
+    return Service.of({ makeWorktreeInfo, createFromInfo, create, remove, reset })
+  }),
+)
+
+export const defaultLayer = layer.pipe(
+  Layer.provide(Git.defaultLayer),
+  Layer.provide(CrossSpawnSpawner.defaultLayer),
+  Layer.provide(Project.defaultLayer),
+  Layer.provide(AppFileSystem.defaultLayer),
+  Layer.provide(NodePath.layer),
+)