diff --git a/packages/contracts/src/git.ts b/packages/contracts/src/git.ts
index 6f1e4ea90c3e313f8a7cf13a59fb3b0c53b47705..8d1f22d1d8dd915d527dc8bd673f82857c3a43d3 100644
--- a/packages/contracts/src/git.ts
+++ b/packages/contracts/src/git.ts
@@ -22,6 +22,11 @@ export const gitCreateBranchInputSchema = z.object({
   branch: z.string().min(1),
 });
 
+export const gitCheckoutInputSchema = z.object({
+  cwd: z.string().min(1),
+  branch: z.string().min(1),
+});
+
 export const gitInitInputSchema = z.object({
   cwd: z.string().min(1),
 });
@@ -50,6 +55,7 @@ export type GitRemoveWorktreeInput = z.infer<
   typeof gitRemoveWorktreeInputSchema
 >;
 export type GitCreateBranchInput = z.infer<typeof gitCreateBranchInputSchema>;
+export type GitCheckoutInput = z.infer<typeof gitCheckoutInputSchema>;
 export type GitInitInput = z.infer<typeof gitInitInputSchema>;
 
 export interface GitListBranchesResult {
diff --git a/packages/contracts/src/ipc.ts b/packages/contracts/src/ipc.ts
index d0b843d322fd9bcc266a10b9ea96f3af85e62a50..0070e3100288134e1b6ddaba02db7188fa382d75 100644
--- a/packages/contracts/src/ipc.ts
+++ b/packages/contracts/src/ipc.ts
@@ -1,5 +1,6 @@
 import type { AgentConfig, AgentExit, OutputChunk } from "./agent";
 import type {
+  GitCheckoutInput,
   GitCreateBranchInput,
   GitCreateWorktreeInput,
   GitCreateWorktreeResult,
@@ -76,6 +77,7 @@ export interface NativeApi {
     createWorktree: (input: GitCreateWorktreeInput) => Promise<GitCreateWorktreeResult>;
     removeWorktree: (input: GitRemoveWorktreeInput) => Promise<void>;
     createBranch: (input: GitCreateBranchInput) => Promise<void>;
+    checkout: (input: GitCheckoutInput) => Promise<void>;
     init: (input: GitInitInput) => Promise<void>;
   };
 }