[Enhancement]: Support file path for MCP tools with uploaded images

[huymai-lihuhu]

What features would you like to see added?

Problem
I'm using nanobanana-mcp-server with LibreChat. Text-to-image generation works fine, but when users upload an image to edit, it fails with:

error: [api/server/controllers/agents/client.js #sendCompletion] 
Operation aborted Please provide image as base64 encoded data URL

Root Cause
The MCP tool requires a file path to process uploaded images, but LibreChat doesn't save uploaded images to the server filesystem or provide file paths to MCP tools.

More details

Proposed Solution
When users upload images:
Save the image to server filesystem (e.g., temp directory)
Pass the file path to MCP tools (in addition to or instead of base64)

This would enable MCP tools that require file paths (like image editing tools) to work with uploaded images.

Workaround Request
Is there any current workaround or configuration I can use to fix this issue? Any guidance would be greatly appreciated.
Environment

LibreChat: v.0.8.1-rc2
MCP: nanobanana-mcp-server
Deployment: Docker

Which components are impacted by your request?

General

Pictures

No response

Code of Conduct

• I agree to follow this project's Code of Conduct

[danny-avila]

When users upload images:
Save the image to server filesystem (e.g., temp directory)

This happens already. The path would be {project-root}\client\public\images\{user-id}\file-id+name.EXT

Pass the file path to MCP tools (in addition to or instead of base64)

You could combine the filesystem mcp server, only give each user access to their appropriate path for images:

mcpServers:
  filesystem:
    startup: false
    command: node
    args:
      - /home/danny/server-filesystem/dist/index.js
      - /home/danny/LibreChat/client/public/images/{{LIBRECHAT_USER_ID}}/

[huymai-lihuhu]

Nice, it work with me. Thankyou so much!

[vineetneural]

@huymai-lihuhu can you please help me with the mcp configuration for nano banana. Am unable to make it work.

[teecrow]

Add it as an MCP server in your librechat.yaml file, as seen below. The following works in the standard remote Docker deployment described on the LibreChat docs webpages:

mcpServers:
  nanobanana:
    command: uvx
    args:
      - nanobanana-mcp-server@latest
    env:
      GEMINI_API_KEY: "${GOOGLE_KEY}"

[vineetneural]

Thank you !! I will try this.