chore: bump SDK to 0.2.78 with parity updates

package.json

@@ -10,7 +10,7 @@
   },
   "dependencies": {
     "@a2a-js/sdk": "^0.3.12",
-    "@anthropic-ai/claude-agent-sdk": "^0.2.77",
+    "@anthropic-ai/claude-agent-sdk": "^0.2.78",
     "zod": "^4.0.0"
   },
   "devDependencies": {

src/com/tjclp/scalagent/hooks/HookCallback.scala

@@ -6,6 +6,7 @@ import scala.scalajs.js.JSConverters.*
 import zio.*
 import zio.json.ast.Json
 import com.tjclp.scalagent.config.PermissionMode
+import com.tjclp.scalagent.messages.AssistantMessageError
 import com.tjclp.scalagent.tools.ToolName
 import com.tjclp.scalagent.types.{SessionId, SubagentId, ToolUseId}
 
@@ -231,6 +232,19 @@ object HookCallback:
           permissionMode = permissionMode
         )
 
+      case "StopFailure" =>
+        HookInput.StopFailure(
+          sessionId = sessionId,
+          cwd = cwd,
+          transcriptPath = transcriptPath,
+          error = AssistantMessageError.fromString(firstString(raw, "error").getOrElse("unknown")),
+          errorDetails = firstString(raw, "error_details", "errorDetails"),
+          lastAssistantMessage = firstString(raw, "last_assistant_message", "lastAssistantMessage"),
+          hookAgentId = baseAgentId,
+          hookAgentType = baseAgentType,
+          permissionMode = permissionMode
+        )
+
       case "SubagentStart" =>
         HookInput.SubagentStart(
           sessionId = sessionId,

src/com/tjclp/scalagent/hooks/HookEvent.scala

@@ -35,6 +35,9 @@ enum HookEvent:
   /** Stop hook triggered */
   case Stop
 
+  /** Stop failure hook - triggered when agent fails to stop cleanly */
+  case StopFailure
+
   /** Subagent initiated */
   case SubagentStart
 
@@ -85,6 +88,7 @@ enum HookEvent:
     case SessionStart       => "SessionStart"
     case SessionEnd         => "SessionEnd"
     case Stop               => "Stop"
+    case StopFailure        => "StopFailure"
     case SubagentStart      => "SubagentStart"
     case SubagentStop       => "SubagentStop"
     case PreCompact         => "PreCompact"
@@ -111,6 +115,7 @@ object HookEvent:
     case "SessionStart"      => Right(SessionStart)
     case "SessionEnd"        => Right(SessionEnd)
     case "Stop"              => Right(Stop)
+    case "StopFailure"       => Right(StopFailure)
     case "SubagentStart"     => Right(SubagentStart)
     case "SubagentStop"      => Right(SubagentStop)
     case "PreCompact"        => Right(PreCompact)
@@ -137,6 +142,7 @@ object HookEvent:
     case "SessionStart"      => SessionStart
     case "SessionEnd"        => SessionEnd
     case "Stop"              => Stop
+    case "StopFailure"       => StopFailure
     case "SubagentStart"     => SubagentStart
     case "SubagentStop"      => SubagentStop
     case "PreCompact"        => PreCompact

src/com/tjclp/scalagent/hooks/HookInput.scala

@@ -2,6 +2,7 @@ package com.tjclp.scalagent.hooks
 
 import com.tjclp.scalagent.config.PermissionMode
 import com.tjclp.scalagent.json.StringEnumJsonCodec
+import com.tjclp.scalagent.messages.AssistantMessageError
 import com.tjclp.scalagent.tools.ToolName
 import com.tjclp.scalagent.types.{SessionId, SubagentId, ToolUseId}
 import zio.json.*
@@ -160,6 +161,19 @@ object HookInput:
       permissionMode: Option[PermissionMode] = None
   ) extends HookInput
 
+  /** Input for StopFailure hook - triggered when agent fails to stop cleanly */
+  final case class StopFailure(
+      sessionId: SessionId,
+      cwd: String,
+      transcriptPath: String,
+      error: AssistantMessageError,
+      errorDetails: Option[String] = None,
+      lastAssistantMessage: Option[String] = None,
+      hookAgentId: Option[SubagentId] = None,
+      hookAgentType: Option[String] = None,
+      permissionMode: Option[PermissionMode] = None
+  ) extends HookInput
+
   /** Input for SubagentStart hook */
   final case class SubagentStart(
       sessionId: SessionId,

src/com/tjclp/scalagent/messages/AgentMessage.scala

@@ -166,6 +166,13 @@ enum AgentMessage:
       sessionId: SessionId
   )
 
+  /** Bridge metadata message carrying slash commands */
+  case BridgeMetadata(
+      @jsonField("slash_commands") slashCommands: List[String],
+      uuid: MessageUuid,
+      sessionId: SessionId
+  )
+
   /** Forward-compatible fallback for unknown top-level SDK messages */
   case Unknown(
       envelope: UnknownEnvelope

src/com/tjclp/scalagent/streaming/MessageConverter.scala

@@ -203,6 +203,14 @@ object MessageConverter:
         guardTopLevelUnknown(raw, "system", Some("api_retry"), context) {
           parseApiRetryMessage(obj, raw)
         }
+      case Some("bridge_metadata") =>
+        guardTopLevelUnknown(raw, "system", Some("bridge_metadata"), context) {
+          AgentMessage.BridgeMetadata(
+            slashCommands = stringArrayField(obj, "slash_commands"),
+            uuid = requiredUuid(obj, raw),
+            sessionId = requiredSessionId(obj, raw)
+          )
+        }
       case other =>
         AgentMessage.System(
           event = parseSystemEvent(obj, raw, other, context),

test/src/com/tjclp/scalagent/hooks/HookCallbackSpec.scala

@@ -7,6 +7,7 @@ import scala.scalajs.js
 import scala.scalajs.js.JSConverters.*
 import zio.*
 import com.tjclp.scalagent.config.PermissionMode
+import com.tjclp.scalagent.messages.AssistantMessageError
 import com.tjclp.scalagent.types.SubagentId
 
 class HookCallbackSpec extends FunSuite:
@@ -166,6 +167,32 @@ class HookCallbackSpec extends FunSuite:
       case other => fail(s"Expected PermissionRequest, got: $other")
     }
 
+  test("parseHookInput handles StopFailure"):
+    val raw = baseInput("StopFailure")
+    raw.error = "rate_limit"
+    raw.error_details = "Rate limit exceeded"
+    raw.last_assistant_message = "I was trying to help"
+
+    parseInput(raw).map {
+      case input: HookInput.StopFailure =>
+        assertEquals(input.error, AssistantMessageError.RateLimit)
+        assertEquals(input.errorDetails, Some("Rate limit exceeded"))
+        assertEquals(input.lastAssistantMessage, Some("I was trying to help"))
+        assertEquals(input.permissionMode, Some(PermissionMode.Custom("delegate")))
+      case other => fail(s"Expected StopFailure, got: $other")
+    }
+
+  test("parseHookInput handles StopFailure with missing error defaults to Unknown"):
+    val raw = baseInput("StopFailure")
+
+    parseInput(raw).map {
+      case input: HookInput.StopFailure =>
+        assertEquals(input.error, AssistantMessageError.Unknown)
+        assertEquals(input.errorDetails, None)
+        assertEquals(input.lastAssistantMessage, None)
+      case other => fail(s"Expected StopFailure, got: $other")
+    }
+
   test("parseHookInput handles InstructionsLoaded with agent metadata"):
     val raw = baseInput("InstructionsLoaded")
     raw.file_path = "/tmp/project/CLAUDE.md"

test/src/com/tjclp/scalagent/streaming/MessageConverterSpec.scala

@@ -388,6 +388,36 @@ class MessageConverterSpec extends FunSuite:
       case other =>
         fail(s"Expected ApiRetry, got: $other")
 
+  test("parses bridge_metadata message"):
+    val raw = js.Dynamic.literal(
+      `type` = "system",
+      subtype = "bridge_metadata",
+      slash_commands = js.Array("/help", "/commit", "/review-pr"),
+      uuid = "msg-bridge-1",
+      session_id = "session-1"
+    )
+
+    MessageConverter.fromRaw(raw) match
+      case AgentMessage.BridgeMetadata(slashCommands, _, _) =>
+        assertEquals(slashCommands, List("/help", "/commit", "/review-pr"))
+      case other =>
+        fail(s"Expected BridgeMetadata, got: $other")
+
+  test("parses bridge_metadata with empty slash_commands"):
+    val raw = js.Dynamic.literal(
+      `type` = "system",
+      subtype = "bridge_metadata",
+      slash_commands = js.Array[String](),
+      uuid = "msg-bridge-2",
+      session_id = "session-1"
+    )
+
+    MessageConverter.fromRaw(raw) match
+      case AgentMessage.BridgeMetadata(slashCommands, _, _) =>
+        assertEquals(slashCommands, Nil)
+      case other =>
+        fail(s"Expected BridgeMetadata, got: $other")
+
   test("parses task_progress with summary"):
     val raw = js.Dynamic.literal(
       `type` = "system",