[PR #19241] [CLOSED] MCP: get __files__ information from OpenWebUI #112453

New Issue

GiteaMirror · 2026-05-18T12:35:09-05:00

GiteaMirror commented

2026-05-18 12:35:09 -05:00

📋 Pull Request Information

Original PR: https://github.com/open-webui/open-webui/pull/19241
Author: @tobiasbaur
Created: 11/17/2025
Status: ❌ Closed

Base: dev ← Head: dev

📝 Commits (1)

f89e549 Update middleware.py

📊 Changes

1 file changed (+4 additions, -0 deletions)

View changed files

📝 backend/open_webui/utils/middleware.py (+4 -0)

📄 Description

Description

Tools in Openwebui have access to some reserved variable names, for example to the attached files in a chat. For MCP this so far doesn't work. This PR introduces reserved variable names (to be more precise: files) to also work with MCP.
A MCP server that accepts files: dict get access to the file information

Example mcp tool:

@mcp.tool
def process_files(__files__: dict):
    """
    give information on the attached file
    """
    print(str(__files__))
    return str(__files__)

This allows an mcp server, with minimal parsing of the dict to know the id and local url on the file server, making it easy to access files via api or on the local file structure to be processed within an mcp tool.

Added

reserved files word to also be considered for mcp tool calls.

Screenshots or Videos

This is the result of the above mcp tool

Contributor License Agreement

By submitting this pull request, I confirm that I have read and fully agree to the Contributor License Agreement (CLA), and I am providing my contributions under its terms.

_{🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.}

## 📋 Pull Request Information **Original PR:** https://github.com/open-webui/open-webui/pull/19241 **Author:** [@tobiasbaur](https://github.com/tobiasbaur) **Created:** 11/17/2025 **Status:** ❌ Closed **Base:** `dev` ← **Head:** `dev` --- ### 📝 Commits (1) - [`f89e549`](https://github.com/open-webui/open-webui/commit/f89e549a4da90cfd064a8813d8f23a792cf4e08d) Update middleware.py ### 📊 Changes **1 file changed** (+4 additions, -0 deletions) <details> <summary>View changed files</summary> 📝 `backend/open_webui/utils/middleware.py` (+4 -0) </details> ### 📄 Description ### Description - Tools in Openwebui have access to some reserved variable names, for example to the attached files in a chat. For MCP this so far doesn't work. This PR introduces reserved variable names (to be more precise: __files__) to also work with MCP. A MCP server that accepts __files__: dict get access to the file information Example mcp tool: ``` @mcp.tool def process_files(__files__: dict): """ give information on the attached file """ print(str(__files__)) return str(__files__) ``` This allows an mcp server, with minimal parsing of the dict to know the id and local url on the file server, making it easy to access files via api or on the local file structure to be processed within an mcp tool. ### Added - reserved __files__ word to also be considered for mcp tool calls. ### Screenshots or Videos <img width="1054" height="522" alt="Screenshot 2025-11-17 at 21 04 45" src="https://github.com/user-attachments/assets/154cee98-6bf5-48e7-8fd2-59a8ae1e0fdc" /> This is the result of the above mcp tool ### Contributor License Agreement By submitting this pull request, I confirm that I have read and fully agree to the [Contributor License Agreement (CLA)](https://github.com/open-webui/open-webui/blob/main/CONTRIBUTOR_LICENSE_AGREEMENT), and I am providing my contributions under its terms. --- <sub>🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.</sub>

GiteaMirror added the pull-request label 2026-05-18 12:35:09 -05:00

GiteaMirror closed this issue

2026-05-18 12:35:13 -05:00

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Reference: github-starred/open-webui#112453