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Update MIME types for UI resources to include profile for MCP Apps #2078

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Merged
mattdholloway merged 2 commits into from
Feb 24, 2026
+9 −6
Merged

Update MIME types for UI resources to include profile for MCP Apps #2078

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dd44305
update MIME types for UI resources to include profile for MCP Apps
mattdholloway Feb 24, 2026
bdc71e2
make it a const
mattdholloway Feb 24, 2026
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3 changes: 3 additions & 0 deletions pkg/github/ui_capability.go
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,9 @@ import (
// advertise MCP Apps UI support.
const mcpAppsExtensionKey = "io.modelcontextprotocol/ui"

// MCPAppMIMEType is the MIME type for MCP App UI resources.
const MCPAppMIMEType = "text/html;profile=mcp-app"

// clientSupportsUI reports whether the MCP client that sent this request
// supports MCP Apps UI rendering.
// It checks the context first (set by HTTP/stateless servers from stored
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12 changes: 6 additions & 6 deletions pkg/github/ui_resources.go
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Original file line number Diff line number Diff line change
Expand Up @@ -17,15 +17,15 @@ func RegisterUIResources(s *mcp.Server) {
URI: GetMeUIResourceURI,
Name: "get_me_ui",
Description: "MCP App UI for the get_me tool",
MIMEType: "text/html",
MIMEType: MCPAppMIMEType,
},
func(_ context.Context, _ *mcp.ReadResourceRequest) (*mcp.ReadResourceResult, error) {
html := MustGetUIAsset("get-me.html")
return &mcp.ReadResourceResult{
Contents: []*mcp.ResourceContents{
{
URI: GetMeUIResourceURI,
MIMEType: "text/html",
MIMEType: MCPAppMIMEType,
Text: html,
// MCP Apps UI metadata - CSP configuration to allow loading GitHub avatars
// See: https://github.com/modelcontextprotocol/ext-apps/blob/main/specification/draft/apps.mdx
Expand All @@ -49,15 +49,15 @@ func RegisterUIResources(s *mcp.Server) {
URI: IssueWriteUIResourceURI,
Name: "issue_write_ui",
Description: "MCP App UI for creating and updating GitHub issues",
MIMEType: "text/html",
MIMEType: MCPAppMIMEType,
},
func(_ context.Context, _ *mcp.ReadResourceRequest) (*mcp.ReadResourceResult, error) {
html := MustGetUIAsset("issue-write.html")
return &mcp.ReadResourceResult{
Contents: []*mcp.ResourceContents{
{
URI: IssueWriteUIResourceURI,
MIMEType: "text/html",
MIMEType: MCPAppMIMEType,
Text: html,
},
},
Expand All @@ -71,15 +71,15 @@ func RegisterUIResources(s *mcp.Server) {
URI: PullRequestWriteUIResourceURI,
Name: "pr_write_ui",
Description: "MCP App UI for creating GitHub pull requests",
MIMEType: "text/html",
MIMEType: MCPAppMIMEType,
},
func(_ context.Context, _ *mcp.ReadResourceRequest) (*mcp.ReadResourceResult, error) {
html := MustGetUIAsset("pr-write.html")
return &mcp.ReadResourceResult{
Contents: []*mcp.ResourceContents{
{
URI: PullRequestWriteUIResourceURI,
MIMEType: "text/html",
MIMEType: MCPAppMIMEType,
Text: html,
},
},
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