fix(stop-continuation): scope start-work clearing to fallback template

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/plugin/chat-message.test.ts

@@ -17,6 +17,18 @@ import { clearSessionModel, getSessionModel, setSessionModel } from "../shared/s
 type ChatMessagePart = { type: string; text?: string; [key: string]: unknown }
 type ChatMessageHandlerOutput = { message: Record<string, unknown>; parts: ChatMessagePart[] }
 
+function createStartWorkTemplateOutput(): ChatMessageHandlerOutput {
+  return {
+    message: {},
+    parts: [
+      {
+        type: "text",
+        text: `<session-context>context</session-context>\nYou are starting a Sisyphus work session.`,
+      },
+    ],
+  }
+}
+
 function createStopContinuationGuardMock(isStopped: boolean) {
   const clearCalls: string[] = []
   const isStoppedCalls: string[] = []
@@ -248,10 +260,7 @@ describe("createChatMessageHandler - stop continuation clearing for raw slash fa
       },
     }
     const handler = createChatMessageHandler(args)
-    const output: ChatMessageHandlerOutput = {
-      message: {},
-      parts: [{ type: "text", text: "/start-work" }],
-    }
+    const output = createStartWorkTemplateOutput()
 
     // when
     await handler(createMockInput("sisyphus"), output)
@@ -322,6 +331,31 @@ describe("createChatMessageHandler - stop continuation clearing for raw slash fa
     expect(stopContinuationGuard.clearCalls).toEqual(["test-session"])
   })
 
+  test("does not clear stop state for ordinary stopped chat messages", async () => {
+    // given
+    const stopContinuationGuard = createStopContinuationGuardMock(true)
+    const startWorkCalls: string[] = []
+    const args = createMockHandlerArgs()
+    args.hooks.stopContinuationGuard = stopContinuationGuard.guard
+    args.hooks.startWork = {
+      "chat.message": async (input: { sessionID: string }) => {
+        startWorkCalls.push(input.sessionID)
+      },
+    }
+    const handler = createChatMessageHandler(args)
+
+    // when
+    await handler(createMockInput("sisyphus"), {
+      message: {},
+      parts: [{ type: "text", text: "continue helping with this bug" }],
+    })
+
+    // then
+    expect(startWorkCalls).toEqual(["test-session"])
+    expect(stopContinuationGuard.isStoppedCalls).toHaveLength(0)
+    expect(stopContinuationGuard.clearCalls).toHaveLength(0)
+  })
+
   test("does not clear stop state when the session was not stopped", async () => {
     // given
     const stopContinuationGuard = createStopContinuationGuardMock(false)
@@ -346,7 +380,7 @@ describe("createChatMessageHandler - stop continuation clearing for raw slash fa
     // when
     await handler(createMockInput("sisyphus"), {
       message: {},
-      parts: [{ type: "text", text: "/start-work" }],
+      parts: createStartWorkTemplateOutput().parts,
     })
     await handler(createMockInput("sisyphus"), {
       message: {},
@@ -371,8 +405,6 @@ describe("createChatMessageHandler - stop continuation clearing for raw slash fa
       "test-session",
       "test-session",
       "test-session",
-      "test-session",
-      "test-session",
     ])
     expect(stopContinuationGuard.clearCalls).toHaveLength(0)
   })

src/plugin/chat-message.ts

@@ -26,6 +26,7 @@ export type ChatMessageInput = {
 type StartWorkHookOutput = { parts: Array<{ type: string; text?: string }> }
 
 type SessionModelOverride = { providerID: string; modelID: string }
+const START_WORK_TEMPLATE_MARKER = "You are starting a Sisyphus work session."
 
 type RawLoopCommand =
   | { command: "ralph-loop" | "ulw-loop"; args: string }
@@ -125,6 +126,23 @@ function parseRawLoopSlashCommand(promptText: string): RawLoopCommand | null {
   return null
 }
 
+function extractPromptText(parts: ChatMessagePart[]): string {
+  return (
+    parts
+      ?.filter((part) => part.type === "text" && part.text)
+      .map((part) => part.text)
+      .join("\n")
+      .trim() || ""
+  )
+}
+
+function isStartWorkFallbackTemplate(promptText: string): boolean {
+  return (
+    promptText.includes("<session-context>") &&
+    promptText.includes(START_WORK_TEMPLATE_MARKER)
+  )
+}
+
 function clearStoppedContinuationBeforeWorkStart(
   hooks: CreatedHooks,
   sessionID: string,
@@ -221,7 +239,10 @@ export function createChatMessageHandler(args: {
     await hooks.noSisyphusGpt?.["chat.message"]?.(input, output)
     await hooks.noHephaestusNonGpt?.["chat.message"]?.(input, output)
     if (hooks.startWork && isStartWorkHookOutput(output)) {
-      clearStoppedContinuationBeforeWorkStart(hooks, input.sessionID, "start-work")
+      const promptText = extractPromptText(output.parts)
+      if (isStartWorkFallbackTemplate(promptText)) {
+        clearStoppedContinuationBeforeWorkStart(hooks, input.sessionID, "start-work")
+      }
       await hooks.startWork["chat.message"]?.(input, output)
     }
 
@@ -241,12 +262,7 @@ export function createChatMessageHandler(args: {
 
     if (hooks.ralphLoop && output.message[NATIVE_LOOP_TRIGGERED_FLAG] !== true) {
       const parts = output.parts
-      const promptText =
-        parts
-          ?.filter((p) => p.type === "text" && p.text)
-          .map((p) => p.text)
-          .join("\n")
-          .trim() || ""
+      const promptText = extractPromptText(parts)
 
       const isRalphLoopTemplate =
         promptText.includes("You are starting a Ralph Loop") &&