fix(patterns): align langgraph and strands agents with AG-UI docs

[ranst91]

Description of changes:
Both patterns were using the legacy HTTP streaming approach — parsing prompt/runtimeSessionId from the payload and yielding raw dicts — instead of the AG-UI protocol described in the AgentCore docs.

Switch to RunAgentInput as the input format and wrap agents with LangGraphAgent (ag_ui_langgraph) and StrandsAgent (ag_ui_strands) so both patterns produce proper AG-UI event streams when deployed with --protocol AGUI.

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[github-actions]

Latest scan for commit: 8ce5958 | Updated: 2026-04-03 17:18:14 UTC

Security Scan Results

Scan Metadata

• Project: ASH
• Scan executed: 2026-04-03T17:17:55+00:00
• ASH version: 3.2.2

Summary

Scanner Results

The table below shows findings by scanner, with status based on severity thresholds and dependencies:

Column Explanations:

Severity Levels (S/C/H/M/L/I):

• Suppressed (S): Security findings that have been explicitly suppressed/ignored and don't affect the scanner's pass/fail status
• Critical (C): The most severe security vulnerabilities requiring immediate remediation (e.g., SQL injection, remote code execution)
• High (H): Serious security vulnerabilities that should be addressed promptly (e.g., authentication bypasses, privilege escalation)
• Medium (M): Moderate security risks that should be addressed in normal development cycles (e.g., weak encryption, input validation issues)
• Low (L): Minor security concerns with limited impact (e.g., information disclosure, weak recommendations)
• Info (I): Informational findings for awareness with minimal security risk (e.g., code quality suggestions, best practice recommendations)

Other Columns:

• Time: Duration taken by each scanner to complete its analysis
• Action: Total number of actionable findings at or above the configured severity threshold that require attention

Scanner Results:

• PASSED: Scanner found no security issues at or above the configured severity threshold - code is clean for this scanner
• FAILED: Scanner found security vulnerabilities at or above the threshold that require attention and remediation
• MISSING: Scanner could not run because required dependencies/tools are not installed or available
• SKIPPED: Scanner was intentionally disabled or excluded from this scan
• ERROR: Scanner encountered an execution error and could not complete successfully

Severity Thresholds (Thresh Column):

• CRITICAL: Only Critical severity findings cause scanner to fail
• HIGH: High and Critical severity findings cause scanner to fail
• MEDIUM (MED): Medium, High, and Critical severity findings cause scanner to fail
• LOW: Low, Medium, High, and Critical severity findings cause scanner to fail
• ALL: Any finding of any severity level causes scanner to fail

Threshold Source: Values in parentheses indicate where the threshold is configured:

• (g) = global: Set in the global_settings section of ASH configuration
• (c) = config: Set in the individual scanner configuration section
• (s) = scanner: Default threshold built into the scanner itself

Statistics calculation:

• All statistics are calculated from the final aggregated SARIF report
• Suppressed findings are counted separately and do not contribute to actionable findings
• Scanner status is determined by comparing actionable findings to the threshold

Scanner	S	C	H	M	L	I	Time	Action	Result	Thresh
bandit	0	0	0	0	0	0	780ms	0	PASSED	MED (g)
cdk-nag	0	0	0	0	0	0	36.1s	0	PASSED	MED (g)
cfn-nag	0	0	0	0	0	0	6ms	0	PASSED	MED (g)
checkov	0	0	0	0	0	0	5.3s	0	PASSED	MED (g)
detect-secrets	0	0	0	0	0	0	168ms	0	PASSED	MED (g)
grype	0	0	0	0	0	0	39.7s	0	PASSED	MED (g)
npm-audit	0	0	0	0	0	0	352ms	0	PASSED	MED (g)
opengrep	0	0	0	0	0	0	22.1s	0	PASSED	MED (g)
semgrep	0	0	0	0	0	0	22.0s	0	PASSED	MED (g)
syft	0	0	0	0	0	0	1.9s	0	PASSED	MED (g)

[razkenari]

@ranst91 The files in patterns/strands-single-agent and patterns/langgraph-single-agent are showing native Strands and LangGraph streaming implementations. The AG-UI patterns are in patterns/agui-langgraph-agent and patterns/agui-strands-agent. Please review those to see if any updates are needed based on this approach, and push changes to those patterns accordingly