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[GH-ISSUE #1] upload_file and get_output fail with ENOENT - file paths resolve on server, not client #3

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opened 2026-10-26 22:27:38 +00:00 by bsakaguchi · 2 comments
bsakaguchi commented 2026-10-26 22:27:38 +00:00
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Originally created by @kygdigital on GitHub (Mar 28, 2026).
Original GitHub issue: https://github.com/Comfy-Org/comfy-cloud-mcp/issues/1

The upload_file and get_output tools attempt to read/write files using paths that resolve on the MCP server's filesystem rather than the client's local machine.

Steps to reproduce:

  1. Call upload_file with a valid local file path (e.g., /Users/me/Downloads/photo.jpg)
  2. Observe error: ENOENT: no such file or directory, open '/Users/me/Downloads/photo.jpg'

Same issue with get_output — it tries to save to a server-side path like /home/app/Downloads/ComfyUI/ which doesn't exist locally.

Expected behavior:

  • upload_file should read files from the client's local filesystem
  • get_output should save files to the client's local filesystem

Workaround:

  • upload_file: Pass image data via the base64_data parameter instead of file_path
  • get_output: Image data is still returned as base64 in the response, so it can be decoded and saved manually

Environment:

  • macOS (Darwin 25.2.0)
  • ComfyUI Cloud MCP via Claude Code
Originally created by @kygdigital on GitHub (Mar 28, 2026). Original GitHub issue: https://github.com/Comfy-Org/comfy-cloud-mcp/issues/1 The upload_file and get_output tools attempt to read/write files using paths that resolve on the MCP server's filesystem rather than the client's local machine. Steps to reproduce: 1. Call upload_file with a valid local file path (e.g., /Users/me/Downloads/photo.jpg) 2. Observe error: ENOENT: no such file or directory, open '/Users/me/Downloads/photo.jpg' Same issue with get_output — it tries to save to a server-side path like /home/app/Downloads/ComfyUI/ which doesn't exist locally. Expected behavior: - upload_file should read files from the client's local filesystem - get_output should save files to the client's local filesystem Workaround: - upload_file: Pass image data via the base64_data parameter instead of file_path - get_output: Image data is still returned as base64 in the response, so it can be decoded and saved manually Environment: - macOS (Darwin 25.2.0) - ComfyUI Cloud MCP via Claude Code
bsakaguchi commented 2026-10-26 22:27:39 +00:00
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@mattmillerai commented on GitHub (Mar 30, 2026):

Thanks for the report — this is a known limitation of the remote HTTP transport. When the MCP server runs remotely (on cloud.comfy.org), file paths in upload_file and get_output resolve on the server's filesystem, not the client's.

Current workarounds:

  • upload_file: Use the base64_data parameter instead of file_path
  • get_output: The image data is returned in the response and can be saved manually

What's being fixed:
We're working on improvements to file handling that will:

  • Save output files to the client's local filesystem automatically
  • Provide clearer error messages when file paths can't be resolved
<!-- gh-comment-id:4158334999 --> @mattmillerai commented on GitHub (Mar 30, 2026): Thanks for the report — this is a known limitation of the remote HTTP transport. When the MCP server runs remotely (on cloud.comfy.org), file paths in `upload_file` and `get_output` resolve on the server's filesystem, not the client's. **Current workarounds:** - `upload_file`: Use the `base64_data` parameter instead of `file_path` - `get_output`: The image data is returned in the response and can be saved manually **What's being fixed:** We're working on improvements to file handling that will: - Save output files to the client's local filesystem automatically - Provide clearer error messages when file paths can't be resolved
bsakaguchi commented 2026-10-26 22:27:39 +00:00
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@mattmillerai commented on GitHub (Jun 22, 2026):

Migrated to Comfy-Org/comfy-cloud-mcp-server#428 (this installer repo is being archived). Tracking there.

<!-- gh-comment-id:4773759933 --> @mattmillerai commented on GitHub (Jun 22, 2026): Migrated to Comfy-Org/comfy-cloud-mcp-server#428 (this installer repo is being archived). Tracking there.
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