From 90be61b45b88daf41a8be2c253b062443ceaacab Mon Sep 17 00:00:00 2001
From: YeonGyu-Kim <code.yeon.gyu@gmail.com>
Date: Sun, 8 Mar 2026 02:23:11 +0900
Subject: [PATCH] fix(compaction): add checkpoint store for session agent
 config

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

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
---
 .../compaction-agent-config-checkpoint.ts     | 42 +++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 src/shared/compaction-agent-config-checkpoint.ts

diff --git a/src/shared/compaction-agent-config-checkpoint.ts b/src/shared/compaction-agent-config-checkpoint.ts
new file mode 100644
index 000000000..47a3cabb3
--- /dev/null
+++ b/src/shared/compaction-agent-config-checkpoint.ts
@@ -0,0 +1,42 @@
+export type CompactionAgentConfigCheckpoint = {
+  agent?: string
+  model?: { providerID: string; modelID: string }
+  tools?: Record<string, boolean>
+}
+
+const checkpoints = new Map<string, CompactionAgentConfigCheckpoint>()
+
+function cloneCheckpoint(
+  checkpoint: CompactionAgentConfigCheckpoint,
+): CompactionAgentConfigCheckpoint {
+  return {
+    ...(checkpoint.agent ? { agent: checkpoint.agent } : {}),
+    ...(checkpoint.model
+      ? {
+          model: {
+            providerID: checkpoint.model.providerID,
+            modelID: checkpoint.model.modelID,
+          },
+        }
+      : {}),
+    ...(checkpoint.tools ? { tools: { ...checkpoint.tools } } : {}),
+  }
+}
+
+export function setCompactionAgentConfigCheckpoint(
+  sessionID: string,
+  checkpoint: CompactionAgentConfigCheckpoint,
+): void {
+  checkpoints.set(sessionID, cloneCheckpoint(checkpoint))
+}
+
+export function getCompactionAgentConfigCheckpoint(
+  sessionID: string,
+): CompactionAgentConfigCheckpoint | undefined {
+  const checkpoint = checkpoints.get(sessionID)
+  return checkpoint ? cloneCheckpoint(checkpoint) : undefined
+}
+
+export function clearCompactionAgentConfigCheckpoint(sessionID: string): void {
+  checkpoints.delete(sessionID)
+}