feat: add version-aware AWS CLI guidance to credential error messages

Users who hit expired credential errors now see contextual guidance
based on their AWS CLI version:
- Not installed → install link + "aws login"
- Installed but < 2.32.0 → upgrade link + "aws login"
- >= 2.32.0 → "aws login"

Preserves original error messages for invalid credentials (check env
vars) and missing credentials (env vars fallback). Also updates stale
"aws sso login" reference to "aws login" in pre-deploy identity flow.

Author: Abhimanyu Siwach

src/cli/aws/account.ts

@@ -1,3 +1,4 @@
+import { getAwsLoginGuidance } from '../external-requirements/checks';
 import { GetCallerIdentityCommand, STSClient } from '@aws-sdk/client-sts';
 import { fromEnv, fromNodeProviderChain } from '@aws-sdk/credential-providers';
 import type { AwsCredentialIdentityProvider } from '@smithy/types';
@@ -46,9 +47,10 @@ export async function detectAccount(): Promise<string | null> {
     const code = (err as { name?: string })?.name ?? (err as { Code?: string })?.Code;
 
     if (code === 'ExpiredTokenException' || code === 'ExpiredToken') {
+      const guidance = await getAwsLoginGuidance();
       throw new AwsCredentialsError(
         'AWS credentials expired.',
-        'AWS credentials expired.\n\nTo fix this:\n  Run: aws login'
+        `AWS credentials expired.\n\nTo fix this:\n  ${guidance}`
       );
     }
 
@@ -77,12 +79,10 @@ export async function detectAccount(): Promise<string | null> {
 export async function validateAwsCredentials(): Promise<void> {
   const account = await detectAccount();
   if (!account) {
+    const guidance = await getAwsLoginGuidance();
     throw new AwsCredentialsError(
       'No AWS credentials configured.',
-      'No AWS credentials configured.\n\n' +
-        'To fix this:\n' +
-        '  1. Run: aws login\n' +
-        '  2. Or set AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY environment variables'
+      `No AWS credentials configured.\n\nTo fix this:\n  ${guidance}\n  Or set AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY environment variables`
     );
   }
 }

src/cli/external-requirements/checks.ts

@@ -4,7 +4,7 @@
 import { checkSubprocess, isWindows, runSubprocessCapture } from '../../lib';
 import type { AgentCoreProjectSpec, TargetLanguage } from '../../schema';
 import { detectContainerRuntime } from './detect';
-import { NODE_MIN_VERSION, formatSemVer, parseSemVer, semVerGte } from './versions';
+import { AWS_CLI_MIN_VERSION, NODE_MIN_VERSION, formatSemVer, parseSemVer, semVerGte } from './versions';
 
 /**
  * Result of a version check.
@@ -70,6 +70,73 @@ export async function checkUvVersion(): Promise<VersionCheckResult> {
   return { satisfied: true, current, required: 'any', binary: 'uv' };
 }
 
+const AWS_CLI_INSTALL_URL = 'https://docs.aws.amazon.com/cli/latest/userguide/getting-started-install.html';
+
+/**
+ * Extract version from `aws --version` output.
+ * Expected format: "aws-cli/2.32.0 Python/3.11.6 Darwin/23.3.0 ..."
+ */
+function parseAwsCliVersion(output: string): string | null {
+  const match = /aws-cli\/(\d+\.\d+\.\d+)/.exec(output.trim());
+  return match?.[1] ?? null;
+}
+
+/**
+ * Check that AWS CLI meets minimum version requirement for `aws login`.
+ */
+export async function checkAwsCliVersion(): Promise<VersionCheckResult> {
+  const required = formatSemVer(AWS_CLI_MIN_VERSION);
+
+  const result = await runSubprocessCapture('aws', ['--version']);
+  if (result.code !== 0) {
+    return { satisfied: false, current: null, required, binary: 'aws' };
+  }
+
+  const versionStr = parseAwsCliVersion(result.stdout);
+  if (!versionStr) {
+    return { satisfied: false, current: null, required, binary: 'aws' };
+  }
+
+  const current = parseSemVer(versionStr);
+  if (!current) {
+    return { satisfied: false, current: versionStr, required, binary: 'aws' };
+  }
+
+  return {
+    satisfied: semVerGte(current, AWS_CLI_MIN_VERSION),
+    current: versionStr,
+    required,
+    binary: 'aws',
+  };
+}
+
+/** Cached result for getAwsLoginGuidance */
+let _awsLoginGuidance: string | null = null;
+
+/**
+ * Get version-aware guidance for authenticating with AWS.
+ * Checks if AWS CLI is installed and whether it supports `aws login`.
+ * Result is cached for the lifetime of the process.
+ */
+export async function getAwsLoginGuidance(): Promise<string> {
+  if (_awsLoginGuidance) return _awsLoginGuidance;
+
+  const check = await checkAwsCliVersion();
+
+  if (check.current === null) {
+    // AWS CLI not installed
+    _awsLoginGuidance = `1. Install AWS CLI (v${formatSemVer(AWS_CLI_MIN_VERSION)}+): ${AWS_CLI_INSTALL_URL}\n  2. Run: aws login`;
+  } else if (!check.satisfied) {
+    // AWS CLI installed but too old
+    _awsLoginGuidance = `1. Update AWS CLI from v${check.current} to v${formatSemVer(AWS_CLI_MIN_VERSION)}+: ${AWS_CLI_INSTALL_URL}\n  2. Run: aws login`;
+  } else {
+    // AWS CLI is new enough
+    _awsLoginGuidance = 'Run: aws login';
+  }
+
+  return _awsLoginGuidance;
+}
+
 /**
  * Format a version check failure as a user-friendly error message.
  */
@@ -234,7 +301,7 @@ export async function checkCreateDependencies(
   });
   if (!awsAvailable) {
     warnings.push(
-      "'aws' CLI not found. Required for 'aws sso login' and profile configuration. Install from https://aws.amazon.com/cli/"
+      `'aws' CLI not found. Required for 'aws login'. Install v${formatSemVer(AWS_CLI_MIN_VERSION)}+ from ${AWS_CLI_INSTALL_URL}`
     );
   }
 

src/cli/external-requirements/index.ts

@@ -1,8 +1,18 @@
-export { parseSemVer, compareSemVer, semVerGte, formatSemVer, NODE_MIN_VERSION, type SemVer } from './versions';
+export {
+  parseSemVer,
+  compareSemVer,
+  semVerGte,
+  formatSemVer,
+  NODE_MIN_VERSION,
+  AWS_CLI_MIN_VERSION,
+  type SemVer,
+} from './versions';
 
 export {
   checkNodeVersion,
   checkUvVersion,
+  checkAwsCliVersion,
+  getAwsLoginGuidance,
   formatVersionError,
   requiresUv,
   requiresContainerRuntime,

src/cli/external-requirements/versions.ts

@@ -59,3 +59,6 @@ export function formatSemVer(v: SemVer): string {
 
 /** Minimum Node.js version required for CDK synth (ES2022 target) */
 export const NODE_MIN_VERSION: SemVer = { major: 18, minor: 0, patch: 0 };
+
+/** Minimum AWS CLI version required for `aws login` */
+export const AWS_CLI_MIN_VERSION: SemVer = { major: 2, minor: 32, patch: 0 };

src/cli/operations/deploy/pre-deploy-identity.ts

@@ -171,7 +171,7 @@ async function setupApiKeyCredentialProvider(
     // Provide clearer error message for AWS credentials issues
     let errorMessage: string;
     if (isNoCredentialsError(error)) {
-      errorMessage = 'AWS credentials not found. Run `aws sso login` or set AWS_ACCESS_KEY_ID/AWS_SECRET_ACCESS_KEY.';
+      errorMessage = 'AWS credentials not found. Run `aws login` to authenticate.';
     } else {
       errorMessage = error instanceof Error ? error.message : String(error);
     }