Media upload tools fail with "Output validation error: 'meta' is a required property" #5

Bug Report: Media upload tools fail with "Output validation error: 'meta' is a required property"

Description

When attempting to upload media using the mediaUpload tool (or
initializeMediaUpload),
the tool fails with the following error:

Output validation error: 'meta' is a required property

This appears to be a response validation issue where the MCP server expects a meta
field
in the X API response, but the field is not present in the actual response returned by
the API.

Steps to Reproduce

1. Call the mediaUpload tool with a valid base64-encoded JPEG image:

   {
     "media": "<base64-encoded image>",
     "media_type": "image/jpeg",
     "media_category": "tweet_image"
   }

2. Observe the error.

Expected Behavior

The tool should return a media_id that can be used in subsequent post creation.

Actual Behavior

Output validation error: 'meta' is a required property

The upload fails entirely and no media_id is returned, making it impossible to attach
images to posts via MCP.

Environment

• xmcp version: 3.2.0 (X API MCP)
• MCP Client: Claude Code (claude-sonnet-4-6)

Impact

Image posting via Claude Code / MCP is completely broken. Text-only posts work fine.

Possible Cause

The output schema for the media upload tools likely requires a meta property that
the X API does not include in its response. The schema validation should either:

• Make meta optional, or
• Strip unknown/missing fields before validation