fix(ralph-loop): clear orphaned state when original session no longer exists (#446)

* fix(ralph-loop): clear orphaned state when original session no longer exists

When a session with an active ralph-loop terminates abnormally (abort, window close),
the state file remains with active: true. Previously, when a new session started,
the hook would skip the orphaned state without cleaning it up.

This fix adds session existence validation:
- Before skipping a loop owned by a different session, check if that session still exists
- If the original session no longer exists, clear the orphan state and log
- If the original session still exists, skip as before (it's another active session's loop)

Changes:
- Add checkSessionExists option to RalphLoopOptions for dependency injection
- Wire up sessionExists from session-manager as the default implementation
- Add tests for orphan state cleanup and active session preservation

* fix(ralph-loop): add error handling around checkSessionExists call

Wraps the async checkSessionExists call in try/catch for consistency
with other async operations in this file. If the check throws, logs
the error and falls back to the original behavior (not clearing state).

---------

Co-authored-by: sisyphus-dev-ai <sisyphus-dev-ai@users.noreply.github.com>

src/hooks/ralph-loop/index.test.ts

@@ -302,6 +302,77 @@ describe("ralph-loop", () => {
       expect(promptCalls.length).toBe(0)
     })
 
+    test("should clear orphaned state when original session no longer exists", async () => {
+      // #given - state file exists from a previous session that no longer exists
+      const state: RalphLoopState = {
+        active: true,
+        iteration: 3,
+        max_iterations: 50,
+        completion_promise: "DONE",
+        started_at: "2025-12-30T01:00:00Z",
+        prompt: "Build something",
+        session_id: "orphaned-session-999", // This session no longer exists
+      }
+      writeState(TEST_DIR, state)
+
+      // Mock sessionExists to return false for the orphaned session
+      const hook = createRalphLoopHook(createMockPluginInput(), {
+        checkSessionExists: async (sessionID: string) => {
+          // Orphaned session doesn't exist, current session does
+          return sessionID !== "orphaned-session-999"
+        },
+      })
+
+      // #when - a new session goes idle (different from the orphaned session in state)
+      await hook.event({
+        event: {
+          type: "session.idle",
+          properties: { sessionID: "new-session-456" },
+        },
+      })
+
+      // #then - orphaned state should be cleared
+      expect(hook.getState()).toBeNull()
+      // #then - no continuation injected (state was cleared, not resumed)
+      expect(promptCalls.length).toBe(0)
+    })
+
+    test("should NOT clear state when original session still exists (different active session)", async () => {
+      // #given - state file exists from a session that still exists
+      const state: RalphLoopState = {
+        active: true,
+        iteration: 2,
+        max_iterations: 50,
+        completion_promise: "DONE",
+        started_at: "2025-12-30T01:00:00Z",
+        prompt: "Build something",
+        session_id: "active-session-123", // This session still exists
+      }
+      writeState(TEST_DIR, state)
+
+      // Mock sessionExists to return true for the active session
+      const hook = createRalphLoopHook(createMockPluginInput(), {
+        checkSessionExists: async (sessionID: string) => {
+          // Original session still exists
+          return sessionID === "active-session-123" || sessionID === "new-session-456"
+        },
+      })
+
+      // #when - a different session goes idle
+      await hook.event({
+        event: {
+          type: "session.idle",
+          properties: { sessionID: "new-session-456" },
+        },
+      })
+
+      // #then - state should NOT be cleared (original session still active)
+      expect(hook.getState()).not.toBeNull()
+      expect(hook.getState()?.session_id).toBe("active-session-123")
+      // #then - no continuation injected (it's a different session's loop)
+      expect(promptCalls.length).toBe(0)
+    })
+
     test("should use default config values", () => {
       // #given - hook with config
       const hook = createRalphLoopHook(createMockPluginInput(), {

src/hooks/ralph-loop/index.ts

@@ -64,6 +64,7 @@ export function createRalphLoopHook(
   const stateDir = config?.state_dir
   const getTranscriptPath = options?.getTranscriptPath ?? getDefaultTranscriptPath
   const apiTimeout = options?.apiTimeout ?? DEFAULT_API_TIMEOUT
+  const checkSessionExists = options?.checkSessionExists
 
   function getSessionState(sessionID: string): SessionState {
     let state = sessions.get(sessionID)
@@ -199,6 +200,24 @@ export function createRalphLoopHook(
       }
 
       if (state.session_id && state.session_id !== sessionID) {
+        if (checkSessionExists) {
+          try {
+            const originalSessionExists = await checkSessionExists(state.session_id)
+            if (!originalSessionExists) {
+              clearState(ctx.directory, stateDir)
+              log(`[${HOOK_NAME}] Cleared orphaned state from deleted session`, {
+                orphanedSessionId: state.session_id,
+                currentSessionId: sessionID,
+              })
+              return
+            }
+          } catch (err) {
+            log(`[${HOOK_NAME}] Failed to check session existence`, {
+              sessionId: state.session_id,
+              error: String(err),
+            })
+          }
+        }
         return
       }
 

src/hooks/ralph-loop/types.ts

@@ -14,4 +14,5 @@ export interface RalphLoopOptions {
   config?: RalphLoopConfig
   getTranscriptPath?: (sessionId: string) => string
   apiTimeout?: number
+  checkSessionExists?: (sessionId: string) => Promise<boolean>
 }

src/index.ts

@@ -48,6 +48,7 @@ import {
   createLookAt,
   createSkillTool,
   createSkillMcpTool,
+  sessionExists,
   interactive_bash,
   getTmuxPath,
 } from "./tools";
@@ -146,7 +147,10 @@ const OhMyOpenCodePlugin: Plugin = async (ctx) => {
     : null;
 
   const ralphLoop = isHookEnabled("ralph-loop")
-    ? createRalphLoopHook(ctx, { config: pluginConfig.ralph_loop })
+    ? createRalphLoopHook(ctx, {
+        config: pluginConfig.ralph_loop,
+        checkSessionExists: async (sessionId) => sessionExists(sessionId),
+      })
     : null;
 
   const autoSlashCommand = isHookEnabled("auto-slash-command")

src/tools/index.ts

@@ -28,6 +28,8 @@ import {
   session_info,
 } from "./session-manager"
 
+export { sessionExists } from "./session-manager/storage"
+
 export { interactive_bash, startBackgroundCheck as startTmuxCheck } from "./interactive-bash"
 export { createSkillTool } from "./skill"
 export { getTmuxPath } from "./interactive-bash/utils"