feat(core): add native skill activation

packages/core/src/session/compaction.ts

@@ -130,6 +130,7 @@ const serialize = (message: SessionMessage.Message) => {
   }
   if (message.type === "system") return `[System update]: ${message.text}`
   if (message.type === "synthetic") return `[Synthetic context]: ${message.text}`
+  if (message.type === "skill") return `[Skill activated: ${message.name}]\n${message.text}`
   if (message.type === "shell") return `[Shell]: ${message.command}\n${truncate(message.output)}`
   return ""
 }

packages/core/src/session/message-updater.ts

@@ -159,6 +159,17 @@ export function update(adapter: Adapter, event: SessionEvent.Event) {
           }),
         )
       },
+      "session.next.skill.activated": (event) => {
+        return adapter.appendMessage(
+          SessionMessage.Skill.make({
+            id: event.data.messageID,
+            type: "skill",
+            name: event.data.name,
+            text: event.data.text,
+            time: { created: event.data.timestamp },
+          }),
+        )
+      },
       "session.next.shell.started": (event) => {
         return adapter.appendMessage(
           SessionMessage.Shell.make({

packages/core/src/session/projector.ts

@@ -584,6 +584,15 @@ export const layer = Layer.effectDiscard(
     )
     yield* events.project(SessionEvent.ContextUpdated, (event) => run(db, event))
     yield* events.project(SessionEvent.Synthetic, (event) => run(db, event))
+    yield* events.project(SessionEvent.Skill.Activated, (event) =>
+      insertMessage(db, event, {
+        id: event.data.messageID,
+        type: "skill",
+        name: event.data.name,
+        text: event.data.text,
+        time: { created: event.data.timestamp },
+      }),
+    )
     yield* events.project(SessionEvent.Shell.Started, (event) => run(db, event))
     yield* events.project(SessionEvent.Shell.Ended, (event) => run(db, event))
     yield* events.project(SessionEvent.Step.Started, (event) => run(db, event))

packages/core/src/session/runner/to-llm-message.ts

@@ -131,6 +131,8 @@ function toLLMMessage(message: SessionMessage.Message, model: Model): Message[]
       ]
     case "synthetic":
       return [Message.make({ id: message.id, role: "user", content: message.text, metadata: message.metadata })]
+    case "skill":
+      return [Message.make({ id: message.id, role: "user", content: message.text, metadata: message.metadata })]
     case "system":
       return [Message.system(message.text)]
     case "shell":