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Ran 15 Dec 2025 03:00PM UTC

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Committed 15 Dec 2025 02:57PM UTC coverage: 49.813% (-0.01%) from 49.824%

Job # 20236691614.1

Build Type

push

github

Committed by

web-flow

Commit Message

Composite Tools Support Structured Content (#3009)

Changes
Core Fix (pkg/vmcp/client/client.go):

Check result.StructuredContent before processing result.Content array
If StructuredContent is an object (map[string]any), use it directly as step output
Fall back to existing Content processing for text/image content
Test Helpers (test/integration/vmcp/helpers/backend.go):

Add StructuredHandler field to BackendTool for structured content responses
Add NewBackendToolWithStructuredResponse() constructor
Update CreateBackendServer to use mcp.NewToolResultStructuredOnly() when appropriate
Integration Tests (test/integration/vmcp/vmcp_integration_test.go):

TestVMCPServer_StructuredContent: Tests nested field access via {{.steps.X.output.field.nested}}
TestVMCPServer_DefaultResults_NestedStructure: Tests nested defaultResults fallback
Documentation:

docs/operator/virtualmcpcompositetooldefinition-guide.md: Added "Step Output Format" and "Numeric Values in Templates" sections
docs/operator/advanced-workflow-patterns.md: Added "Step Output Format" and "Numeric Comparisons" sections

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Signed-off-by: Jeremy Drouillard <jeremy@stacklok.com>

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