[PR #19122] [MERGED] fix: Duplicate instructions in tool selection calling prompt #112408

New Issue

2026-05-18T12:31:00-05:00

GiteaMirror commented

2026-05-18 12:31:00 -05:00

📋 Pull Request Information

Original PR: https://github.com/open-webui/open-webui/pull/19122
Author: @matiboux
Created: 11/11/2025
Status: ✅ Merged
Merged: 11/11/2025
Merged by: @tjbck

Base: dev ← Head: fix/tool-selection-user-message

📝 Commits (2)

dccadd3 Fix duplicated query prefix in user prompt for function calling
c4b4e18 Fix duplicated last user message in prompt for function calling

📊 Changes

1 file changed (+6 additions, -2 deletions)

View changed files

📝 backend/open_webui/utils/middleware.py (+6 -2)

📄 Description

Pull Request Checklist

Before submitting, make sure you've checked the following:

Target branch: Verify that the pull request targets the dev branch. Not targeting the dev branch will lead to immediate closure of the PR.
Description: Provide a concise description of the changes made in this pull request down below.
Changelog: Ensure a changelog entry following the format of Keep a Changelog is added at the bottom of the PR description.
Documentation: If necessary, update relevant documentation Open WebUI Docs like environment variables, the tutorials, or other documentation sources.
Dependencies: Are there any new dependencies? Have you updated the dependency versions in the documentation?
Testing: Perform manual tests to verify the implemented fix/feature works as intended AND does not break any other functionality. Take this as an opportunity to make screenshots of the feature/fix and include it in the PR description.
Agentic AI Code: Confirm this Pull Request is not written by any AI Agent or has at least gone through additional human review AND manual testing. If any AI Agent is the co-author of this PR, it may lead to immediate closure of the PR.
Code review: Have you performed a self-review of your code, addressing any coding standard issues and ensuring adherence to the project's coding standards?
Title Prefix: To clearly categorize this pull request, prefix the pull request title using one of the following:
- fix: Bug fix or error correction

Changelog Entry

Description

This PR updates the logic for constructing the prompt payload in backend/open_webui/utils/middleware.py to avoid duplication and improve clarity when preparing messages for tools selection and calling. The main changes focus on removing redundant instructions and user messages in the prompt.

Added

None.

Changed

Updated function get_tools_function_calling_payload in chat_completion_tools_handler in backend/open_webui/utils/middleware.py to remove duplicated "Query:" prefix and duplicated user message in the prompt used for tools selection and calling.
Updated function get_tools_function_calling_payload in chat_completion_tools_handler in backend/open_webui/utils/middleware.py to omit the chat history if only the user query (last user message) is present.

Deprecated

None.

Removed

None.

Fixed

None.

Security

None.

Breaking Changes

None.

Additional Information

This PR addresses & fixes #19121.

Updated prompts were manually tested and verified using a proxy OpenAI-compatible proxy API to inspect system & user messages.

Tool Selection Request prompt with changes from this PR:

Messages since the last assistant response:
- system
```
Available Tools: [{"name": "calculator", "description": "\n        Calculate the result of an equation.\n        ", "parameters": {"properties": {"equation": {"description": "The mathematical equation to calculate.", "type": "string"}}, "required": ["equation"], "type": "object"}}, {"name": "get_current_time", "description": "\n        Get the current time in a more human-readable format.\n        ", "parameters": {"properties": {}, "type": "object"}}, {"name": "get_current_weather", "description": "\n        Get the current weather for a given city.\n        ", "parameters": {"properties": {"city": {"default": "New York, NY", "description": "Get the current weather for a given city.", "type": "string"}}, "type": "object"}}, {"name": "get_user_name_and_email_and_id", "description": "\n        Get the user name, Email and ID from the user object.\n        ", "parameters": {"properties": {}, "type": "object"}}]

Your task is to choose and return the correct tool(s) from the list of available tools based on the query. Follow these guidelines:

- Return only the JSON object, without any additional text or explanation.

- If no tools match the query, return an empty array: 
   {
     "tool_calls": []
   }

- If one or more tools match the query, construct a JSON response containing a "tool_calls" array with objects that include:
   - "name": The tool's name.
   - "parameters": A dictionary of required parameters and their corresponding values.

The format for the JSON response is strictly:
{
  "tool_calls": [
    {"name": "toolName1", "parameters": {"key1": "value1"}},
    {"name": "toolName2", "parameters": {"key2": "value2"}}
  ]
}
```
- user
```
Query: what time is it?
```

In a conversation with chat history, the user message is sent like this in the Tool Selection Request prompt:

- user
```
History:
USER: """what time is it?"""
ASSISTANT: """Current Date and Time = Tuesday, November 11, 2025, 02:21:04 PM."""
Query: Are you sure? what time is it?
```

Screenshots or Videos

None.

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/19122 **Author:** [@matiboux](https://github.com/matiboux) **Created:** 11/11/2025 **Status:** ✅ Merged **Merged:** 11/11/2025 **Merged by:** [@tjbck](https://github.com/tjbck) **Base:** `dev` ← **Head:** `fix/tool-selection-user-message` --- ### 📝 Commits (2) - [`dccadd3`](https://github.com/open-webui/open-webui/commit/dccadd3d768ca9023f6ebdf0e871ca29bad3b80e) Fix duplicated query prefix in user prompt for function calling - [`c4b4e18`](https://github.com/open-webui/open-webui/commit/c4b4e185bc5631f8d06b2836f47a695bc7a5e4f5) Fix duplicated last user message in prompt for function calling ### 📊 Changes **1 file changed** (+6 additions, -2 deletions) <details> <summary>View changed files</summary> 📝 `backend/open_webui/utils/middleware.py` (+6 -2) </details> ### 📄 Description # Pull Request Checklist **Before submitting, make sure you've checked the following:** - [x] **Target branch:** Verify that the pull request targets the `dev` branch. **Not targeting the `dev` branch will lead to immediate closure of the PR.** - [x] **Description:** Provide a concise description of the changes made in this pull request down below. - [x] **Changelog:** Ensure a changelog entry following the format of [Keep a Changelog](https://keepachangelog.com/) is added at the bottom of the PR description. - [x] **Documentation:** If necessary, update relevant documentation [Open WebUI Docs](https://github.com/open-webui/docs) like environment variables, the tutorials, or other documentation sources. - [x] **Dependencies:** Are there any new dependencies? Have you updated the dependency versions in the documentation? - [x] **Testing:** Perform manual tests to **verify the implemented fix/feature works as intended AND does not break any other functionality**. Take this as an opportunity to **make screenshots of the feature/fix and include it in the PR description**. - [x] **Agentic AI Code:** Confirm this Pull Request is **not written by any AI Agent** or has at least **gone through additional human review AND manual testing**. If any AI Agent is the co-author of this PR, it may lead to immediate closure of the PR. - [x] **Code review:** Have you performed a self-review of your code, addressing any coding standard issues and ensuring adherence to the project's coding standards? - [x] **Title Prefix:** To clearly categorize this pull request, prefix the pull request title using one of the following: - **fix**: Bug fix or error correction # Changelog Entry ### Description - This PR updates the logic for constructing the prompt payload in `backend/open_webui/utils/middleware.py` to avoid duplication and improve clarity when preparing messages for tools selection and calling. The main changes focus on removing redundant instructions and user messages in the prompt. ### Added None. ### Changed - Updated function `get_tools_function_calling_payload` in `chat_completion_tools_handler` in `backend/open_webui/utils/middleware.py` to remove duplicated "Query:" prefix and duplicated user message in the prompt used for tools selection and calling. - Updated function `get_tools_function_calling_payload` in `chat_completion_tools_handler` in `backend/open_webui/utils/middleware.py` to omit the chat history if only the user query (last user message) is present. ### Deprecated None. ### Removed None. ### Fixed None. ### Security None. ### Breaking Changes None. --- ### Additional Information This PR addresses & fixes #19121. Updated prompts were manually tested and verified using a proxy OpenAI-compatible proxy API to inspect system & user messages. Tool Selection Request prompt with changes from this PR: ````` Messages since the last assistant response: - system ``` Available Tools: [{"name": "calculator", "description": "\n Calculate the result of an equation.\n ", "parameters": {"properties": {"equation": {"description": "The mathematical equation to calculate.", "type": "string"}}, "required": ["equation"], "type": "object"}}, {"name": "get_current_time", "description": "\n Get the current time in a more human-readable format.\n ", "parameters": {"properties": {}, "type": "object"}}, {"name": "get_current_weather", "description": "\n Get the current weather for a given city.\n ", "parameters": {"properties": {"city": {"default": "New York, NY", "description": "Get the current weather for a given city.", "type": "string"}}, "type": "object"}}, {"name": "get_user_name_and_email_and_id", "description": "\n Get the user name, Email and ID from the user object.\n ", "parameters": {"properties": {}, "type": "object"}}] Your task is to choose and return the correct tool(s) from the list of available tools based on the query. Follow these guidelines: - Return only the JSON object, without any additional text or explanation. - If no tools match the query, return an empty array: { "tool_calls": [] } - If one or more tools match the query, construct a JSON response containing a "tool_calls" array with objects that include: - "name": The tool's name. - "parameters": A dictionary of required parameters and their corresponding values. The format for the JSON response is strictly: { "tool_calls": [ {"name": "toolName1", "parameters": {"key1": "value1"}}, {"name": "toolName2", "parameters": {"key2": "value2"}} ] } ``` - user ``` Query: what time is it? ``` ````` In a conversation with chat history, the user message is sent like this in the Tool Selection Request prompt: ````` - user ``` History: USER: """what time is it?""" ASSISTANT: """Current Date and Time = Tuesday, November 11, 2025, 02:21:04 PM.""" Query: Are you sure? what time is it? ``` ````` ### Screenshots or Videos None. ### 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 12:31:00 -05:00

GiteaMirror closed this issue

2026-05-18 12:31:03 -05:00

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Reference: github-starred/open-webui#112408