refactor(core): make v2 session inputs event sourced (#30785)

packages/core/src/session/event.ts

@@ -9,6 +9,7 @@ import { FileAttachment, Prompt } from "./prompt"
 import { SessionSchema } from "./schema"
 import { Location } from "../location"
 import { RelativePath } from "../schema"
+import { SessionMessageID } from "./message-id"
 
 export { FileAttachment }
 
@@ -52,6 +53,7 @@ export const AgentSwitched = EventV2.define({
   ...options,
   schema: {
     ...Base,
+    messageID: SessionMessageID.ID,
     agent: Schema.String,
   },
 })
@@ -62,6 +64,7 @@ export const ModelSwitched = EventV2.define({
   ...options,
   schema: {
     ...Base,
+    messageID: SessionMessageID.ID,
     model: ModelV2.Ref,
   },
 })
@@ -83,17 +86,45 @@ export const Prompted = EventV2.define({
   ...options,
   schema: {
     ...Base,
+    messageID: SessionMessageID.ID,
     prompt: Prompt,
     delivery: Schema.Literals(["steer", "queue"]),
   },
 })
 export type Prompted = typeof Prompted.Type
 
+export namespace PromptLifecycle {
+  export const Admitted = EventV2.define({
+    type: "session.next.prompt.admitted",
+    ...options,
+    schema: {
+      ...Base,
+      messageID: SessionMessageID.ID,
+      prompt: Prompt,
+      delivery: Schema.Literals(["steer", "queue"]),
+    },
+  })
+  export type Admitted = typeof Admitted.Type
+
+  export const Promoted = EventV2.define({
+    type: "session.next.prompt.promoted",
+    ...options,
+    schema: {
+      ...Base,
+      messageID: SessionMessageID.ID,
+      prompt: Prompt,
+      timeCreated: V2Schema.DateTimeUtcFromMillis,
+    },
+  })
+  export type Promoted = typeof Promoted.Type
+}
+
 export const Synthetic = EventV2.define({
   type: "session.next.synthetic",
   ...options,
   schema: {
     ...Base,
+    messageID: SessionMessageID.ID,
     text: Schema.String,
   },
 })
@@ -105,6 +136,7 @@ export namespace Shell {
     ...options,
     schema: {
       ...Base,
+      messageID: SessionMessageID.ID,
       callID: Schema.String,
       command: Schema.String,
     },
@@ -129,6 +161,7 @@ export namespace Step {
     ...options,
     schema: {
       ...Base,
+      assistantMessageID: SessionMessageID.ID,
       agent: Schema.String,
       model: ModelV2.Ref,
       snapshot: Schema.String.pipe(Schema.optional),
@@ -141,7 +174,7 @@ export namespace Step {
     ...stepSettlementOptions,
     schema: {
       ...Base,
-      assistantMessageID: EventV2.ID,
+      assistantMessageID: SessionMessageID.ID,
       finish: Schema.String,
       cost: Schema.Finite,
       tokens: Schema.Struct({
@@ -163,7 +196,7 @@ export namespace Step {
     ...stepSettlementOptions,
     schema: {
       ...Base,
-      assistantMessageID: EventV2.ID,
+      assistantMessageID: SessionMessageID.ID,
       error: UnknownError,
     },
   })
@@ -176,6 +209,7 @@ export namespace Text {
     ...options,
     schema: {
       ...Base,
+      assistantMessageID: SessionMessageID.ID,
       textID: Schema.String,
     },
   })
@@ -186,6 +220,7 @@ export namespace Text {
     type: "session.next.text.delta",
     schema: {
       ...Base,
+      assistantMessageID: SessionMessageID.ID,
       textID: Schema.String,
       delta: Schema.String,
     },
@@ -197,6 +232,7 @@ export namespace Text {
     ...options,
     schema: {
       ...Base,
+      assistantMessageID: SessionMessageID.ID,
       textID: Schema.String,
       text: Schema.String,
     },
@@ -210,6 +246,7 @@ export namespace Reasoning {
     ...options,
     schema: {
       ...Base,
+      assistantMessageID: SessionMessageID.ID,
       reasoningID: Schema.String,
       providerMetadata: ProviderMetadata.pipe(Schema.optional),
     },
@@ -221,6 +258,7 @@ export namespace Reasoning {
     type: "session.next.reasoning.delta",
     schema: {
       ...Base,
+      assistantMessageID: SessionMessageID.ID,
       reasoningID: Schema.String,
       delta: Schema.String,
     },
@@ -232,6 +270,7 @@ export namespace Reasoning {
     ...options,
     schema: {
       ...Base,
+      assistantMessageID: SessionMessageID.ID,
       reasoningID: Schema.String,
       text: Schema.String,
       providerMetadata: ProviderMetadata.pipe(Schema.optional),
@@ -243,7 +282,7 @@ export namespace Reasoning {
 export namespace Tool {
   const ToolBase = {
     ...Base,
-    assistantMessageID: EventV2.ID,
+    assistantMessageID: SessionMessageID.ID,
     callID: Schema.String,
   }
 
@@ -370,6 +409,7 @@ export namespace Compaction {
     ...options,
     schema: {
       ...Base,
+      messageID: SessionMessageID.ID,
       reason: Schema.Union([Schema.Literal("auto"), Schema.Literal("manual")]),
     },
   })
@@ -402,6 +442,8 @@ const DurableDefinitions = [
   ModelSwitched,
   Moved,
   Prompted,
+  PromptLifecycle.Admitted,
+  PromptLifecycle.Promoted,
   Synthetic,
   Shell.Started,
   Shell.Ended,