Add MCP Apps UI support with SDK dashboard#413
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jongalloway merged 6 commits intomainfrom Mar 21, 2026
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Implement MCP Apps (SEP-1865) support for the DotnetSdk tool, rendering an interactive HTML dashboard inline in VS Code chat. - Add McpAppsResources with ui:// resource returning themed HTML dashboard - Add both modern nested and legacy flat McpMeta keys on DotnetSdk tool (VS Code requires the legacy 'ui/resourceUri' flat key) - Register McpAppsResources in Program.cs - Add wire format tests validating both _meta key formats - Add doc/mcp-apps.md implementation guide
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… catch clause Co-authored-by: jongalloway <68539+jongalloway@users.noreply.github.com> Agent-Logs-Url: https://github.com/jongalloway/dotnet-mcp/sessions/09222802-7404-459d-a12c-088bc75feba3
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| catch (Exception) | ||
| { | ||
| // If runtime fetch fails, return SDKs only — dashboard will show what it can | ||
| return sdkContent; | ||
| } |
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AI 7 days ago
To fix the problem, we should replace the generic catch (Exception) with more specific exception handlers that reflect the likely failure modes of invoking and parsing dotnet --list-runtimes. Specifically, failures may come from the process execution (I/O, invalid operation, Task cancellation) or from string/array operations while parsing (argument/out-of-range/format). We can group these into a small, explicit set of exception types and still preserve the current behavior: on these known failures, return sdkContent so the dashboard can show SDKs only.
The best minimal-change fix is:
- Replace
catch (Exception)withcatchclauses for a chosen set of expected exceptions, all of which perform the same fallback tosdkContent. - Optionally add a final
catchforOperationCanceledExceptionif cancellation should also result in a graceful fallback; if cancellation should propagate, we omit that. - Do not alter imports or method signatures; only adjust the catch section of
BuildListSdksWithRuntimesStructuredContentAsync.
Concretely, in DotNetMcp/Tools/Sdk/DotNetCliTools.Sdk.Consolidated.cs, around lines 578–619:
- Replace the single
catch (Exception)block with a grouped catch that handles common runtime and parsing errors, e.g.IOException,InvalidOperationException,FormatException,ArgumentException, andIndexOutOfRangeException, all with identical bodies returningsdkContent. This narrows the catch surface while keeping the observable behavior for these failure types unchanged.
Suggested changeset
1
DotNetMcp/Tools/Sdk/DotNetCliTools.Sdk.Consolidated.cs
| @@ -612,11 +612,31 @@ | ||
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| return new { sdks, runtimes }; | ||
| } | ||
| catch (Exception) | ||
| catch (System.IO.IOException) | ||
| { | ||
| // If runtime fetch fails, return SDKs only — dashboard will show what it can | ||
| // If runtime fetch fails due to I/O issues, return SDKs only — dashboard will show what it can | ||
| return sdkContent; | ||
| } | ||
| catch (InvalidOperationException) | ||
| { | ||
| // If runtime fetch fails due to process invocation issues, return SDKs only | ||
| return sdkContent; | ||
| } | ||
| catch (FormatException) | ||
| { | ||
| // If runtime output cannot be parsed as expected, return SDKs only | ||
| return sdkContent; | ||
| } | ||
| catch (ArgumentException) | ||
| { | ||
| // If runtime parsing encounters bad arguments (e.g., Split), return SDKs only | ||
| return sdkContent; | ||
| } | ||
| catch (IndexOutOfRangeException) | ||
| { | ||
| // If runtime parsing encounters unexpected field counts, return SDKs only | ||
| return sdkContent; | ||
| } | ||
| } | ||
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| private static object? BuildListRuntimesStructuredContent(string textResult) |
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Implement MCP Apps (SEP-1865) support for the DotnetSdk tool, rendering an interactive HTML dashboard inline in VS Code chat.