HTTP runtime gateway targets cannot configure schema for policy guardrails

[nborges-aws]

Description

AgentCore Gateway HTTP runtime targets support an optional API schema. However, AWS documentation states that HTTP runtime agents are required provide this schema when using guardrails.

The CLI exposes --schema for gateway targets, but currently rejects it for --type http-runtime. Consequently, users cannot configure policy guardrails correctly for HTTP runtime targets.

Steps to Reproduce

Reproduce --schema validation rejection

1. create HTTP runtime with a policy engine
2. Add an HTTP runtime target while passing --schema flag

Reproduce deploy failure

1. create HTTP runtime with a policy engine
2. Add an HTTP runtime target without passing --schema flag
3. Deploy the target and apply guardrail policies
4. Attempt to invoke the target

Expected Behavior

• The CLI should accept a schema for HTTP runtime targets
• benign requests permitted by policy should succeed

Actual Behavior

• CLI rejects --schema for HTTP runtime targets
• benign requests permitted by policy are rejected due to missing schema

CLI Version

No response

Operating System

macOS

Additional Context

• Accept and validate --schema for http-runtime in CLI
• persist schema source in agentcore.json
• persist schema through deploy