feat(tui): add configurable message_limit for session history

Allow users to configure maximum messages loaded per session via
tui.message_limit config option (default: 100, max: 10000).

Previously hardcoded to 100, which prevented scrolling to earlier
messages in long conversations.

Author: CasualDeveloper

packages/opencode/src/cli/cmd/tui/context/sync.tsx

@@ -345,7 +345,7 @@ export const { use: useSync, provider: SyncProvider } = createSimpleContext({
           if (fullSyncedSessions.has(sessionID)) return
           const [session, messages, todo, diff] = await Promise.all([
             sdk.client.session.get({ sessionID }, { throwOnError: true }),
-            sdk.client.session.messages({ sessionID, limit: 100 }),
+            sdk.client.session.messages({ sessionID, limit: store.config.tui?.message_limit ?? 100 }),
             sdk.client.session.todo({ sessionID }),
             sdk.client.session.diff({ sessionID }),
           ])

packages/opencode/src/config/config.ts

@@ -585,6 +585,13 @@ export namespace Config {
       .enum(["auto", "stacked"])
       .optional()
       .describe("Control diff rendering style: 'auto' adapts to terminal width, 'stacked' always shows single column"),
+    message_limit: z
+      .number()
+      .int()
+      .min(1)
+      .max(10000)
+      .optional()
+      .describe("Maximum number of messages to load per session (default: 100)"),
   })
 
   export const Layout = z.enum(["auto", "stretch"]).meta({

packages/sdk/js/src/gen/types.gen.ts

@@ -1195,6 +1195,10 @@ export type Config = {
      * Control diff rendering style: 'auto' adapts to terminal width, 'stacked' always shows single column
      */
     diff_style?: "auto" | "stacked"
+    /**
+     * Maximum number of messages to load per session (default: 100)
+     */
+    message_limit?: number
   }
   /**
    * Command configuration, see https://opencode.ai/docs/commands

packages/sdk/js/src/v2/gen/types.gen.ts

@@ -1409,6 +1409,10 @@ export type Config = {
      * Control diff rendering style: 'auto' adapts to terminal width, 'stacked' always shows single column
      */
     diff_style?: "auto" | "stacked"
+    /**
+     * Maximum number of messages to load per session (default: 100)
+     */
+    message_limit?: number
   }
   /**
    * Command configuration, see https://opencode.ai/docs/commands

packages/sdk/openapi.json

@@ -8167,6 +8167,12 @@
                 "description": "Control diff rendering style: 'auto' adapts to terminal width, 'stacked' always shows single column",
                 "type": "string",
                 "enum": ["auto", "stacked"]
+              },
+              "message_limit": {
+                "description": "Maximum number of messages to load per session (default: 100)",
+                "type": "integer",
+                "minimum": 1,
+                "maximum": 10000
               }
             }
           },