Add resource operation tests for MCP gateway

[Copilot]

The MCP gateway already implements resource listing and reading (lines 796-814 in pkg/awmg/gateway.go), but lacked tests validating this functionality.

Changes

Enhanced test mock server (gateway_streamable_http_test.go):

• Added resources/list and resources/read method handlers
• Updated server capabilities to advertise resource support

Added resource operation tests to three existing test functions:

• TestStreamableHTTPTransport_GatewayConnection - validates resources from real backend
• TestStreamableHTTPTransport_GoSDKClient - validates mock server resource handling
• TestStreamableHTTPTransport_GatewayWithSDKClient - validates end-to-end proxy behavior

Test Coverage

Tests validate:

• Resource listing from backend MCP servers
• Resource reading via gateway proxy
• Metadata preservation (URI, name, description, MIME type)
• Content transmission (text field)
• Proper forwarding of operations to backends

Example test pattern:

// List resources from backend
resourcesResult, err := session.ListResources(ctx, &mcp.ListResourcesParams{})

// Read a specific resource
readResult, err := session.ReadResource(ctx, &mcp.ReadResourceParams{
    URI: "file:///test/resource.txt",
})

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• https://api.github.com/user
  • Triggering command: /usr/bin/gh gh api user --jq .login -json GO111MODULE ux-amd64/bin/go GOINSECURE GOMOD GOMODCACHE go env -json GO111MODULE rg/[email protected] GOINSECURE GOMOD GOMODCACHE go (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

Add support for resources in gateway.go

---

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[pelikhan]

@copilot format, lint go

[Copilot]

@copilot format, lint go

Done. The code was already properly formatted and passes all lint checks:

• ✅ gofmt - no formatting changes needed
• ✅ go vet - passes
• ✅ golangci-lint - 0 issues
• ✅ make fmt - all files formatted correctly
• ✅ make lint - all validations passed

The file pkg/awmg/gateway_streamable_http_test.go is clean.