diff --git a/apps/webapp/app/routes/api.v1.deployments.ts b/apps/webapp/app/routes/api.v1.deployments.ts
index 98bd151af..5be291bae 100644
--- a/apps/webapp/app/routes/api.v1.deployments.ts
+++ b/apps/webapp/app/routes/api.v1.deployments.ts
@@ -60,7 +60,6 @@ export async function action({ request, params }: ActionFunctionArgs) {
               .externalBuildData as InitializeDeploymentResponseBody["externalBuildData"],
             eventStream: result.eventStream,
             canceledDeployments: result.canceledDeployments,
-            ...(result.buildEnvVarsStored ? { buildEnvVarsStored: true } : {}),
           }
         : { isPromoted: result.isPromoted }),
     };
diff --git a/apps/webapp/app/v3/services/initializeDeployment.server.ts b/apps/webapp/app/v3/services/initializeDeployment.server.ts
index 3b8db11e6..4ff618db3 100644
--- a/apps/webapp/app/v3/services/initializeDeployment.server.ts
+++ b/apps/webapp/app/v3/services/initializeDeployment.server.ts
@@ -45,7 +45,6 @@ export type InitializeDeploymentResult =
       imageRef: string;
       eventStream?: DeploymentEventStream;
       canceledDeployments?: SupersededDeployment[];
-      buildEnvVarsStored?: boolean;
     }
   | {
       outcome: "existing";
@@ -105,7 +104,6 @@ export class InitializeDeploymentService extends BaseService {
           outcome: "created",
           deployment: existingDeployment,
           imageRef: existingDeployment.imageReference ?? "",
-          buildEnvVarsStored: false,
         };
       }
 
@@ -445,7 +443,6 @@ export class InitializeDeploymentService extends BaseService {
         imageRef: deployment.imageReference ?? "",
         eventStream,
         canceledDeployments,
-        buildEnvVarsStored: encryptedBuildEnvVars !== undefined,
       };
     });
   }
diff --git a/packages/cli-v3/src/apiClient.ts b/packages/cli-v3/src/apiClient.ts
index 6211c1ad0..8b9fd56eb 100644
--- a/packages/cli-v3/src/apiClient.ts
+++ b/packages/cli-v3/src/apiClient.ts
@@ -690,19 +690,6 @@ export class CliApiClient {
     );
   }
 
-  // 204 on success, no body
-  async cancelDeployment(deploymentId: string, reason?: string) {
-    if (!this.accessToken) {
-      throw new Error("cancelDeployment: No access token");
-    }
-
-    return fetch(`${this.apiURL}/api/v1/deployments/${deploymentId}/cancel`, {
-      method: "POST",
-      headers: this.getHeaders(),
-      body: JSON.stringify({ reason }),
-    });
-  }
-
   async getDeploymentBuildEnvVars(deploymentId: string) {
     if (!this.accessToken) {
       throw new Error("getDeploymentBuildEnvVars: No access token");
diff --git a/packages/cli-v3/src/commands/deploy.ts b/packages/cli-v3/src/commands/deploy.ts
index 8067bf7c5..5ee7e99c2 100644
--- a/packages/cli-v3/src/commands/deploy.ts
+++ b/packages/cli-v3/src/commands/deploy.ts
@@ -105,10 +105,6 @@ type DeployCommandOptions = z.infer<typeof DeployCommandOptions>;
 
 type Deployment = InitializeDeploymentResponseBody;
 
-// Pre-checks of the server-enforced limits, to fail before uploading anything
-const BUILD_ENV_VARS_MAX_BYTES = 128 * 1024;
-const BUILD_ENV_VARS_MAX_KEYS = 200;
-
 export function configureDeployCommand(program: Command) {
   return (
     commonOptions(
@@ -1364,21 +1360,6 @@ async function handleNativeBuildServerDeploy({
       )
     );
 
-    const buildEnvVarCount = Object.keys(bundleBuildEnvVars).length;
-    const buildEnvVarBytes = Buffer.byteLength(JSON.stringify(bundleBuildEnvVars), "utf8");
-
-    if (buildEnvVarCount > BUILD_ENV_VARS_MAX_KEYS) {
-      throw new Error(
-        `Your build uses too many build environment variables: ${buildEnvVarCount} (max ${BUILD_ENV_VARS_MAX_KEYS}).`
-      );
-    }
-
-    if (buildEnvVarBytes > BUILD_ENV_VARS_MAX_BYTES) {
-      throw new Error(
-        `Your build environment variables are too large: ${buildEnvVarBytes} bytes (max ${BUILD_ENV_VARS_MAX_BYTES}). Reduce the size of the env var values used by your build.`
-      );
-    }
-
     if (options.dryRun) {
       logger.info(`Dry run complete. View the built bundle at ${destination.path}`);
       return;
@@ -1567,36 +1548,6 @@ async function handleNativeBuildServerDeploy({
     return;
   }
 
-  // No ack for sent build env vars means an older server stripped them; fail fast.
-  // After the outcome=existing return: a reused deployment builds nothing.
-  if (
-    options.localBundle &&
-    bundleBuildEnvVars &&
-    Object.keys(bundleBuildEnvVars).length > 0 &&
-    !deployment.buildEnvVarsStored
-  ) {
-    // Best-effort cancel so the deployment does not linger until the queue timeout
-    const [cancelError] = await tryCatch(
-      apiClient.cancelDeployment(deployment.id, "Build environment variables were not stored")
-    );
-    if (cancelError) {
-      logger.debug("Failed to cancel deployment after missing build env vars ack", {
-        deploymentId: deployment.id,
-        error: cancelError,
-      });
-    }
-
-    $deploymentSpinner.stop("Failed to initialize deployment");
-    log.error(
-      chalk.bold(
-        chalkError(
-          "This server does not support --local-bundle deploys with build environment variables yet. Deploy without --local-bundle instead."
-        )
-      )
-    );
-    throw new OutroCommandError(`Deployment failed`);
-  }
-
   const exposedDeploymentLink = isLinksSupported
     ? cliLink(chalk.bold(rawDeploymentLink), rawDeploymentLink)
     : chalk.bold(rawDeploymentLink);
diff --git a/packages/core/src/v3/schemas/api.ts b/packages/core/src/v3/schemas/api.ts
index 5e4b820aa..a90430953 100644
--- a/packages/core/src/v3/schemas/api.ts
+++ b/packages/core/src/v3/schemas/api.ts
@@ -758,8 +758,6 @@ export const InitializeDeploymentResponseBody = z.object({
       }),
     })
     .optional(),
-  // Ack that buildEnvVars were stored; absence on an older server is a client-side hard error
-  buildEnvVarsStored: z.boolean().optional(),
 });
 
 export type InitializeDeploymentResponseBody = z.infer<typeof InitializeDeploymentResponseBody>;