feat(core): add scout agent for repo research (#24149)

Co-authored-by: Dax Raad <d@ironbay.co>

packages/opencode/src/config/config.ts

@@ -37,6 +37,7 @@ import { ConfigPaths } from "./paths"
 import { ConfigPermission } from "./permission"
 import { ConfigPlugin } from "./plugin"
 import { ConfigProvider } from "./provider"
+import { ConfigReference } from "./reference"
 import { ConfigServer } from "./server"
 import { ConfigSkills } from "./skills"
 import { ConfigVariable } from "./variable"
@@ -142,6 +143,9 @@ export const Info = Schema.Struct({
     description: "Command configuration, see https://opencode.ai/docs/commands",
   }),
   skills: Schema.optional(ConfigSkills.Info).annotate({ description: "Additional skill folder paths" }),
+  reference: Schema.optional(ConfigReference.Info).annotate({
+    description: "Named git or local directory references that can be @ mentioned as Scout-backed subagents",
+  }),
   watcher: Schema.optional(
     Schema.Struct({
       ignore: Schema.optional(Schema.mutable(Schema.Array(Schema.String))),
@@ -201,6 +205,7 @@ export const Info = Schema.Struct({
         // subagent
         general: Schema.optional(ConfigAgent.Info),
         explore: Schema.optional(ConfigAgent.Info),
+        scout: Schema.optional(ConfigAgent.Info),
         // specialized
         title: Schema.optional(ConfigAgent.Info),
         summary: Schema.optional(ConfigAgent.Info),

packages/opencode/src/config/permission.ts

@@ -35,6 +35,9 @@ const InputObject = Schema.StructWithRest(
     question: Schema.optional(Action),
     webfetch: Schema.optional(Action),
     websearch: Schema.optional(Action),
+    codesearch: Schema.optional(Action),
+    repo_clone: Schema.optional(Rule),
+    repo_overview: Schema.optional(Rule),
     lsp: Schema.optional(Rule),
     doom_loop: Schema.optional(Action),
     skill: Schema.optional(Rule),

packages/opencode/src/config/reference.ts

@@ -0,0 +1,27 @@
+export * as ConfigReference from "./reference"
+
+import { Schema } from "effect"
+import { zod } from "@/util/effect-zod"
+import { withStatics } from "@/util/schema"
+
+const Git = Schema.Struct({
+  repository: Schema.String.annotate({
+    description: "Git repository URL, host/path reference, or GitHub owner/repo shorthand",
+  }),
+  branch: Schema.optional(Schema.String).annotate({
+    description: "Branch or ref Scout should clone and inspect",
+  }),
+})
+
+const Local = Schema.Struct({
+  path: Schema.String.annotate({
+    description: "Absolute path, ~/ path, or workspace-relative path to a local reference directory",
+  }),
+})
+
+export const Entry = Schema.Union([Schema.String, Git, Local]).annotate({ identifier: "ReferenceConfigEntry" })
+
+export const Info = Schema.Record(Schema.String, Entry)
+  .annotate({ identifier: "ReferenceConfig" })
+  .pipe(withStatics((s) => ({ zod: zod(s) })))
+export type Info = Schema.Schema.Type<typeof Info>