mcp: validate required fields in ImageContent and AudioContent #95
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ImageContent and AudioContent now return errors when required fields are missing during JSON marshaling, matching TypeScript schema requirements. ImageContent requires data and mimeType fields. AudioContent requires data and mimeType fields. Added comprehensive test coverage for validation error cases.
This was referenced Jul 4, 2025
findleyr
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Jul 4, 2025
I noticed this while working on #95. Seems Meta was accidentally skipped in the custom wire format struct.
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@martinemde I think your suggestion to remove the 'omitempty' attrs is preferable: the missing 'mimeType' or 'data' field is really an error in business logic, not marshalling. For data, we should be careful to replace nil with an empty byte slice, as JSON null is not valid. Thanks for picking this up! |
findleyr
reviewed
Jul 7, 2025
| } | ||
| if c.MIMEType == "" { | ||
| return nil, errors.New("ImageContent missing mimeType") | ||
| } | ||
| return json.Marshal(&wireContent{ |
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As noted, I think we should use an inline type rather than 'wireContent' here, so that we can make Data and MimeType not "omitempty". We should be sure to replace nil data with the empty slice though.
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This is a follow-up related to #91 (though not requiring it).
ImageContentandAudioContentnow return errors when required fields are missing during JSON marshaling, matching TypeScript schema requirements. This follows the pattern in ResourceContents in the same file.ImageContentrequiresdataandmimeTypefields.AudioContentrequiresdataandmimeTypefields.Alternatives:
Another way to go about this would be to not omit required attrs when the values are blank. At least we would produce blank values which is preferable to omitted keys (which cause the typescript sdk client to fail rather than report a tool call malfunction to the user).