diff --git a/packages/contracts/src/terminal.test.ts b/packages/contracts/src/terminal.test.ts
index 3feae674924..514320f6d4d 100644
--- a/packages/contracts/src/terminal.test.ts
+++ b/packages/contracts/src/terminal.test.ts
@@ -38,13 +38,24 @@ describe("TerminalOpenInput", () => {
     ).toBe(true);
   });
 
+  it("accepts ultrawide terminal dimensions from xterm fit", () => {
+    expect(
+      decodes(TerminalOpenInput, {
+        threadId: "thread-1",
+        cwd: "/tmp/project",
+        cols: 423,
+        rows: 40,
+      }),
+    ).toBe(true);
+  });
+
   it("rejects invalid bounds", () => {
     expect(
       decodes(TerminalOpenInput, {
         threadId: "thread-1",
         cwd: "/tmp/project",
         cols: 10,
-        rows: 2,
+        rows: 0,
       }),
     ).toBe(false);
   });
diff --git a/packages/contracts/src/terminal.ts b/packages/contracts/src/terminal.ts
index 21bd74a0999..c4d9972d8c3 100644
--- a/packages/contracts/src/terminal.ts
+++ b/packages/contracts/src/terminal.ts
@@ -4,11 +4,11 @@ import { TrimmedNonEmptyString } from "./baseSchemas.ts";
 export const DEFAULT_TERMINAL_ID = "default";
 
 const TrimmedNonEmptyStringSchema = TrimmedNonEmptyString;
-const TerminalColsSchema = Schema.Int.check(Schema.isGreaterThanOrEqualTo(20)).check(
-  Schema.isLessThanOrEqualTo(400),
+const TerminalColsSchema = Schema.Int.check(Schema.isGreaterThanOrEqualTo(1)).check(
+  Schema.isLessThanOrEqualTo(1000),
 );
-const TerminalRowsSchema = Schema.Int.check(Schema.isGreaterThanOrEqualTo(5)).check(
-  Schema.isLessThanOrEqualTo(200),
+const TerminalRowsSchema = Schema.Int.check(Schema.isGreaterThanOrEqualTo(1)).check(
+  Schema.isLessThanOrEqualTo(500),
 );
 const TerminalIdSchema = TrimmedNonEmptyStringSchema.check(Schema.isMaxLength(128));
 const TerminalEnvKeySchema = Schema.String.check(