effectify Config service (#19139)

Author: kitlangton

packages/opencode/AGENTS.md

@@ -49,6 +49,10 @@ See `specs/effect-migration.md` for the compact pattern reference and examples.
 - Prefer `Path.Path`, `Config`, `Clock`, and `DateTime` when those concerns are already inside Effect code.
 - For background loops or scheduled tasks, use `Effect.repeat` or `Effect.schedule` with `Effect.forkScoped` in the layer definition.
 
+## Effect.cached for deduplication
+
+Use `Effect.cached` when multiple concurrent callers should share a single in-flight computation rather than storing `Fiber | undefined` or `Promise | undefined` manually. See `specs/effect-migration.md` for the full pattern.
+
 ## Instance.bind — ALS for native callbacks
 
 `Instance.bind(fn)` captures the current Instance AsyncLocalStorage context and restores it synchronously when called.

packages/opencode/specs/effect-migration.md

@@ -121,6 +121,31 @@ yield *
 
 The key insight: don't split init into a separate method with a `started` flag. Put everything in the `InstanceState.make` closure and let `ScopedCache` handle the run-once semantics.
 
+## Effect.cached for deduplication
+
+Use `Effect.cached` when multiple concurrent callers should share a single in-flight computation. It memoizes the result and deduplicates concurrent fibers — second caller joins the first caller's fiber instead of starting a new one.
+
+```ts
+// Inside the layer — yield* to initialize the memo
+let cached = yield* Effect.cached(loadExpensive())
+
+const get = Effect.fn("Foo.get")(function* () {
+  return yield* cached  // concurrent callers share the same fiber
+})
+
+// To invalidate: swap in a fresh memo
+const invalidate = Effect.fn("Foo.invalidate")(function* () {
+  cached = yield* Effect.cached(loadExpensive())
+})
+```
+
+Prefer `Effect.cached` over these patterns:
+- Storing a `Fiber.Fiber | undefined` with manual check-and-fork (e.g. `file/index.ts` `ensure`)
+- Storing a `Promise<void>` task for deduplication (e.g. `skill/index.ts` `ensure`)
+- `let cached: X | undefined` with check-and-load (races when two callers see `undefined` before either resolves)
+
+`Effect.cached` handles the run-once + concurrent-join semantics automatically. For invalidatable caches, reassign with `yield* Effect.cached(...)` — the old memo is discarded.
+
 ## Scheduled Tasks
 
 For loops or periodic work, use `Effect.repeat` or `Effect.schedule` with `Effect.forkScoped` in the layer definition.
@@ -179,7 +204,7 @@ Still open and likely worth migrating:
 - [x] `Worktree`
 - [x] `Bus`
 - [x] `Command`
-- [ ] `Config`
+- [x] `Config`
 - [ ] `Session`
 - [ ] `SessionProcessor`
 - [ ] `SessionPrompt`

packages/opencode/src/cli/cmd/tui/worker.ts

@@ -149,8 +149,7 @@ export const rpc = {
     })
   },
   async reload() {
-    Config.global.reset()
-    await Instance.disposeAll()
+    await Config.invalidate(true)
   },
   async setWorkspace(input: { workspaceID?: string }) {
     startEventStream({ directory: process.cwd(), workspaceID: input.workspaceID })

packages/opencode/src/cli/network.ts

@@ -37,7 +37,7 @@ export function withNetworkOptions<T>(yargs: Argv<T>) {
 }
 
 export async function resolveNetworkOptions(args: NetworkOptions) {
-  const config = await Config.global()
+  const config = await Config.getGlobal()
   const portExplicitlySet = process.argv.includes("--port")
   const hostnameExplicitlySet = process.argv.includes("--hostname")
   const mdnsExplicitlySet = process.argv.includes("--mdns")

packages/opencode/src/cli/upgrade.ts

@@ -4,7 +4,7 @@ import { Flag } from "@/flag/flag"
 import { Installation } from "@/installation"
 
 export async function upgrade() {
-  const config = await Config.global()
+  const config = await Config.getGlobal()
   const method = await Installation.method()
   const latest = await Installation.latest(method).catch(() => {})
   if (!latest) return