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Dynamic select options broken when trigger throws exception #71

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opened 2026-02-15 21:15:33 -05:00 by yindo · 1 comment
yindo commented 2026-02-15 21:15:33 -05:00
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Originally created by @Mairuis on GitHub (Jan 12, 2026).

Description

When using dynamic-select parameter type in tools or models, the plugin executor attempts to get a trigger event handler even when no trigger is registered for the plugin. This causes an unhandled exception that breaks the dynamic select functionality entirely.

Steps to Reproduce

  1. Create a plugin with a tool that uses dynamic-select parameter type
  2. The plugin does NOT register any trigger providers
  3. Attempt to use the dynamic select in Dify

Expected Behavior

Dynamic select options should load correctly and allow users to select from the available options.

Actual Behavior

An exception is thrown in TriggerFactory.get_trigger_event_handler_safely() when it tries to find a trigger provider that doesn't exist, causing the dynamic select to fail.

Root Cause

The get_trigger_event_handler_safely() method in trigger_factory.py calls _get_entry() which raises a ValueError when the provider is not found. This exception was not caught, causing the entire dynamic select flow to break.

Solution

Wrap the method body in a try-except block to catch any exceptions and return None gracefully, allowing the dynamic select to function correctly even when triggers are not involved.

Originally created by @Mairuis on GitHub (Jan 12, 2026). ## Description When using `dynamic-select` parameter type in tools or models, the plugin executor attempts to get a trigger event handler even when no trigger is registered for the plugin. This causes an unhandled exception that breaks the dynamic select functionality entirely. ## Steps to Reproduce 1. Create a plugin with a tool that uses `dynamic-select` parameter type 2. The plugin does NOT register any trigger providers 3. Attempt to use the dynamic select in Dify ## Expected Behavior Dynamic select options should load correctly and allow users to select from the available options. ## Actual Behavior An exception is thrown in `TriggerFactory.get_trigger_event_handler_safely()` when it tries to find a trigger provider that doesn't exist, causing the dynamic select to fail. ## Root Cause The `get_trigger_event_handler_safely()` method in `trigger_factory.py` calls `_get_entry()` which raises a `ValueError` when the provider is not found. This exception was not caught, causing the entire dynamic select flow to break. ## Solution Wrap the method body in a try-except block to catch any exceptions and return `None` gracefully, allowing the dynamic select to function correctly even when triggers are not involved.
yindo commented 2026-02-15 21:15:34 -05:00
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@vhly commented on GitHub (Jan 20, 2026):

me too.
And I want to know "why a tool plugin 's dynamic-select parameter need query trigger"

When I add a trigger provider in tool plugin yaml, "python -m main" will down:

"An error occurred while parsing the data: b'register failed, invalid manifest detected: trigger and tool, model, endpoint, or agent_strategy cannot be provided at the same time'"

@vhly commented on GitHub (Jan 20, 2026): me too. And I want to know "why a tool plugin 's dynamic-select parameter need query trigger" When I add a trigger provider in tool plugin yaml, "python -m main" will down: "An error occurred while parsing the data: b'register failed, invalid manifest detected: trigger and tool, model, endpoint, or agent_strategy cannot be provided at the same time'"
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Reference: langgenius/dify-plugin-sdks#71
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