[Fix Bug]Fix agent strategy function_calling.py

[shua-chen]

Fix Bug. When the model hallucinates and calls a non-existent tool, the agent strategy will directly use the corresponding key to index in the dictionary, thereby triggering a KeyError

Related Issues or Context

This PR contains Changes to Non-Plugin

• Documentation
• Other

This PR contains Changes to Non-LLM Models Plugin

• [] I have Run Comprehensive Tests Relevant to My Changes

This PR contains Changes to LLM Models Plugin

• My Changes Affect Message Flow Handling (System Messages and User→Assistant Turn-Taking)

• My Changes Affect Tool Interaction Flow (Multi-Round Usage and Output Handling, for both Agent App and Agent Node)

• My Changes Affect Multimodal Input Handling (Images, PDFs, Audio, Video, etc.)

• My Changes Affect Multimodal Output Generation (Images, Audio, Video, etc.)

• My Changes Affect Structured Output Format (JSON, XML, etc.)

• My Changes Affect Token Consumption Metrics

• My Changes Affect Other LLM Functionalities (Reasoning Process, Grounding, Prompt Caching, etc.)

• Other Changes (Add New Models, Fix Model Parameters etc.)

Version Control (Any Changes to the Plugin Will Require Bumping the Version)

• I have Bumped Up the Version in Manifest.yaml (Top-Level Version Field, Not in Meta Section)

Dify Plugin SDK Version

• I have Ensured dify_plugin>=0.3.0,<0.6.0 is in requirements.txt (SDK docs)

Environment Verification (If Any Code Changes)

Local Deployment Environment

• Dify Version is: , I have Tested My Changes on Local Deployment Dify with a Clean Environment That Matches the Production Configuration.

SaaS Environment

• I have Tested My Changes on cloud.dify.ai with a Clean Environment That Matches the Production Configuration

[gemini-code-assist]

Summary of Changes

Hello @shua-chen, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request implements a crucial bug fix to enhance the robustness of the agent strategy's function calling mechanism. It specifically targets an issue where the system would crash with a KeyError if an AI model attempted to invoke a tool that does not exist. The change ensures graceful handling of such scenarios, improving the stability and reliability of the agent's operation by safely retrieving tool instances.

Highlights

• Bug Fix: Addresses a KeyError that occurred when the model hallucinated and attempted to call a non-existent tool, preventing agent strategy crashes.

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[gemini-code-assist]

Code Review

This pull request aims to fix a KeyError that occurs when a model hallucinates and calls a non-existent tool. The change correctly uses dict.get() to avoid the crash. However, this introduces a new potential AttributeError because the returned value can be None and is used without a check in subsequent code. My review includes a comment pointing out this new issue and suggesting a fix to ensure the code is robust against this scenario.