feat: add AgentCore Gateway tool search plugin sample

[senthilkumarmohan]

Issue number: #1621

Concise description of the PR

feat: Adds a sample showing how to use the AgentCoreToolSearchPlugin with AgentCore Gateway for semantic tool discovery. Instead of loading all tools for every request, the agent dynamically discovers and loads only the relevant tools based on user intent — demonstrated across 34 travel-domain tools registered on the gateway.

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• I have reviewed the contributing guidelines
• Add your name to CONTRIBUTORS.md
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• Are you uploading a dataset?
• Have you documented Introduction, Architecture Diagram, Prerequisites, Usage, Sample Prompts, and Clean Up steps in your example README?
• I agree to resolve any issues created for this example in the future.
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• Changes have been tested
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Latest scan for commit: 6ff303c | Updated: 2026-06-17 14:38:25 UTC

Security Scan Results

Scan Metadata

• Project: ASH
• Scan executed: 2026-06-17T14:38:05+00:00
• ASH version: 3.0.0

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	915ms	0	PASSED	MED (g)
cdk-nag	0	0	0	0	0	0	6.1s	0	PASSED	MED (g)
cfn-nag	0	0	0	0	0	0	29ms	0	PASSED	MED (g)
checkov	0	0	0	0	0	0	4.8s	0	PASSED	MED (g)
detect-secrets	0	0	0	0	0	0	850ms	0	PASSED	MED (g)
grype	0	0	0	0	0	0	48.2s	0	PASSED	MED (g)
npm-audit	0	0	0	0	0	0	173ms	0	PASSED	MED (g)
opengrep	0	0	0	0	0	0	<1ms	0	SKIPPED	MED (g)
semgrep	0	0	0	0	0	0	<1ms	0	MISSING	MED (g)
syft	0	0	0	0	0	0	2.2s	0	PASSED	MED (g)