refactor(effect): move tool descriptions into registry (#21795)

packages/opencode/test/session/snapshot-tool-race.test.ts

@@ -39,6 +39,7 @@ import { Permission } from "../../src/permission"
 import { Plugin } from "../../src/plugin"
 import { Provider as ProviderSvc } from "../../src/provider/provider"
 import { Question } from "../../src/question"
+import { Skill } from "../../src/skill"
 import { Todo } from "../../src/session/todo"
 import { SessionCompaction } from "../../src/session/compaction"
 import { Instruction } from "../../src/session/instruction"
@@ -131,6 +132,7 @@ function makeHttp() {
   const question = Question.layer.pipe(Layer.provideMerge(deps))
   const todo = Todo.layer.pipe(Layer.provideMerge(deps))
   const registry = ToolRegistry.layer.pipe(
+    Layer.provide(Skill.defaultLayer),
     Layer.provideMerge(todo),
     Layer.provideMerge(question),
     Layer.provideMerge(deps),