From 79d70c7edd17e30e1ac8091674f83bd9949bf38f Mon Sep 17 00:00:00 2001
From: YeonGyu-Kim <code.yeon.gyu@gmail.com>
Date: Tue, 10 Feb 2026 11:16:19 +0900
Subject: [PATCH] fix(atlas): allow boulder continuation for Sisyphus sessions

When boulderState.agent is not explicitly set (defaults to 'atlas'),
allow continuation for sessions where the last agent is 'sisyphus'.
This fixes the issue where boulder continuation was skipped when
Sisyphus took over the conversation after boulder creation.
---
 src/hooks/atlas/event-handler.ts | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/src/hooks/atlas/event-handler.ts b/src/hooks/atlas/event-handler.ts
index a9d26a329..f9024776b 100644
--- a/src/hooks/atlas/event-handler.ts
+++ b/src/hooks/atlas/event-handler.ts
@@ -89,13 +89,20 @@ export function createAtlasEventHandler(input: {
         return
       }
 
-      const requiredAgent = (boulderState.agent ?? "atlas").toLowerCase()
       const lastAgent = getLastAgentFromSession(sessionID)
-      if (!lastAgent || lastAgent !== requiredAgent) {
+      const requiredAgent = (boulderState.agent ?? "atlas").toLowerCase()
+      const lastAgentMatchesRequired = lastAgent === requiredAgent
+      const boulderAgentWasNotExplicitlySet = boulderState.agent === undefined
+      const boulderAgentDefaultsToAtlas = requiredAgent === "atlas"
+      const lastAgentIsSisyphus = lastAgent === "sisyphus"
+      const allowSisyphusWhenDefaultAtlas = boulderAgentWasNotExplicitlySet && boulderAgentDefaultsToAtlas && lastAgentIsSisyphus
+      const agentMatches = lastAgentMatchesRequired || allowSisyphusWhenDefaultAtlas
+      if (!agentMatches) {
         log(`[${HOOK_NAME}] Skipped: last agent does not match boulder agent`, {
           sessionID,
           lastAgent: lastAgent ?? "unknown",
           requiredAgent,
+          boulderAgentExplicitlySet: boulderState.agent !== undefined,
         })
         return
       }