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.Net: Add ThinkingLevel parameter to GeminiThinkingConfig for Gemini 3.0+ - #13396

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.Net: Add ThinkingLevel parameter to GeminiThinkingConfig for Gemini 3.0+#13396
Roger Barreto (rogerbarreto) merged 5 commits into
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copilot/add-thinking-level-parameter

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Copilot AI commented Nov 28, 2025 •
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Motivation and Context

Gemini 3.0 introduces a new ThinkingLevel string parameter with values: "none", "low", "medium", "high". The existing ThinkingBudget parameter remains valid for older Gemini 2.5 models.

Fixes #11920

Description

  • Added ThinkingLevel property to GeminiThinkingConfig
  • Kept ThinkingBudget property as-is (still applicable for older Gemini 2.5 models)
  • Updated GeminiRequestThinkingConfig to serialize both properties
  • Added unit tests for ThinkingLevel serialization and deserialization
  • Converted PromptExecutionSettingsCloneWorksAsExpected to a Theory that tests both ThinkingBudget and ThinkingLevel clone work as expected
  • Kept existing ThinkingBudget unit tests unchanged
  • Renamed sample file to Google_GeminiChatCompletionWithThinking.cs to demonstrate both APIs

Usage:

// Gemini 3.0+
var settings = new GeminiPromptExecutionSettings
{
    ThinkingConfig = new GeminiThinkingConfig { ThinkingLevel = "high" }
};

// Gemini 2.5
var settings = new GeminiPromptExecutionSettings
{
    ThinkingConfig = new GeminiThinkingConfig { ThinkingBudget = 2000 }
};

Contribution Checklist

Original prompt

This section details on the original issue you should resolve

<issue_title>New Feature: .NET Gemini 3.0 Thinking Level parameter</issue_title>
<issue_description>---
name: NET Gemini 3.0 Thinking Level parameter
about: Gemini 3.0 Thinking parameter

In gemini 3.0 the thinking budget is depricated instead we have a new parameter which is a string and its called ThinkingLevel where we can specify what thinking level we want , high, low, default is high
</issue_description>

<agent_instructions>Update GeminiThinkingConfig.cs to support ThinkingLevel. Mark the existing ThinkingBudget parameter as deprecated.</agent_instructions>

Comments on the Issue (you are Copilot in this section)

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Copilot AI changed the title [WIP] Add ThinkingLevel parameter for Gemini 3.0 Add ThinkingLevel parameter to GeminiThinkingConfig for Gemini 3.0 Nov 28, 2025
@rogerbarreto

Roger Barreto (rogerbarreto) commented Nov 28, 2025

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Copilot, Don't obsolete the other property as it is still applicable for older models.

Remove the added #pragma warning disable CS0618 added because of this.

Keep as is all unit tests that were checking for the thinking budget, and additionally add the thinking level tests validating that either can be used and work as expected.

Move/Rename concept test file to "dotnet/samples/Concepts/ChatCompletion/Google_GeminiChatCompletionWithThinking.cs" as this now contains both ways.

@rogerbarreto
Address PR feedback: Remove Obsolete attribute from ThinkingBudget, r…
20705e0 
…emove pragma warnings, rename sample file

Co-authored-by: rogerbarreto <[email protected]>

Copilot AI commented Nov 28, 2025

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Copilot, Don't obsolete the other property as it is still applicable for older models.

Remove the added #pragma warning disable CS0618 added because of this.
...

Done in 20705e0:

  • Removed [Obsolete] attribute from ThinkingBudget
  • Removed all #pragma warning disable CS0618 added for this change
  • Kept existing ThinkingBudget unit tests unchanged
  • Added ThinkingLevel tests alongside them
  • Renamed sample file to Google_GeminiChatCompletionWithThinking.cs

@rogerbarreto

Roger Barreto (rogerbarreto) commented Nov 28, 2025

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Copilot I see you changed the PromptExecutionSettingsCloneWorksAsExpected test, please keep it or make it a theory where you check for both ThinkingBudget and ThinkingLevel Clone work as expected.

@rogerbarreto
Make PromptExecutionSettingsCloneWorksAsExpected a Theory to test bot…
6df9a1f 
…h ThinkingBudget and ThinkingLevel, restore Freeze test

Co-authored-by: rogerbarreto <[email protected]>

Copilot AI commented Nov 28, 2025

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Copilot I see you changed the PromptExecutionSettingsCloneWorksAsExpected test, please keep it or make it a theory where you check for both ThinkingBudget and ThinkingLevel Clone work as expected.

Done in 6df9a1f - Converted PromptExecutionSettingsCloneWorksAsExpected to a Theory with two test cases for both ThinkingBudget and ThinkingLevel. Also restored PromptExecutionSettingsFreezeWorksAsExpected to its original state using ThinkingBudget.

@rogerbarreto
Roger Barreto (rogerbarreto) marked this pull request as ready for review November 28, 2025 15:12
@rogerbarreto Roger Barreto (rogerbarreto) changed the title Add ThinkingLevel parameter to GeminiThinkingConfig for Gemini 3.0 .Net: Add ThinkingLevel parameter to GeminiThinkingConfig for Gemini 3.0+ Nov 28, 2025
@rogerbarreto
Roger Barreto (rogerbarreto) added this pull request to the merge queue Dec 1, 2025
Merged via the queue into main with commit 460521a Dec 1, 2025
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@rogerbarreto
Roger Barreto (rogerbarreto) deleted the copilot/add-thinking-level-parameter branch December 1, 2025 11:12
@sarankumar1325 sarankumar (sarankumar1325) mentioned this pull request Oct 29, 2026
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@leom1919 leom1919 mentioned this pull request Nov 3, 2026
Merged
S.J. (cstolting-collab) pushed a commit to cstolting-collab/semantic-kernel that referenced this pull request Nov 3, 2026
@leom1919
.Net: docs: fix dead links after planner removal and MEVD code migrat…
9137b35 
…ion (microsoft#14715)

### Motivation and Context

A full link-integrity scan of the repository's README files found 13
dead internal links in 4 files. The underlying sample files were deleted
or moved by recent refactors (planner removal microsoft#12399, MEVD Preview 2
microsoft#11028, MsGraph V5 update microsoft#12962, and the Gemini thinking-budget sample
rename in microsoft#13396), but the README entries still point at the old paths.

### Description

- **dotnet/samples/Concepts/README.md**
- `Google_GeminiChatCompletionWithThinkingBudget` -> renamed sample
`Google_GeminiChatCompletionWithThinking` (renamed in microsoft#13396)
- Removed the `VectorStore_DataIngestion_CustomMapper` entry (sample
deleted in microsoft#11028, no replacement)
- Removed the entire `Planners` section (all three samples deleted in
microsoft#12399)
- Removed `MsGraph_ContactsPlugin` / `MsGraph_DrivePlugin` /
`MsGraph_TasksPlugin` entries (no longer present after the MsGraph V5
update in microsoft#12962)
- Removed `WithFunctionCallingStepwisePlanner` entry (deleted together
with the planners in microsoft#12399)
- **dotnet/samples/Demos/OnnxSimpleRAG/README.md**
- Vector Store abstractions link ->
[Microsoft.Extensions.VectorData.Abstractions in
dotnet/extensions](https://github.com/dotnet/extensions/tree/main/src/Libraries/Microsoft.Extensions.VectorData.Abstractions)
(the `dotnet/src/VectorData/VectorData.Abstractions` README itself
points there)
- `InMemoryVectorStore` -> [CommunityToolkit/AI
MEVD/src/InMemory/InMemoryVectorStore.cs](https://github.com/CommunityToolkit/AI/blob/main/MEVD/src/InMemory/InMemoryVectorStore.cs)
(same pointer as `dotnet/src/VectorData/InMemory/README.md`)
- **python/semantic_kernel/connectors/memory_stores/redis/README.md**
- .NET README link -> `dotnet/src/VectorData/Redis/README.md` (current
in-repo location, which forwards to the CommunityToolkit repository)
- **python/samples/concepts/README.md**
- Search section link -> `python/semantic_kernel/connectors/search.py`
(the `connectors/search` directory no longer exists; search now lives in
`search.py`)

### Verification

All 5 new URLs were checked and return HTTP 200. All 13 removed/updated
links were verified to return HTTP 404 against `main` before this
change.

Docs-only change: no code is touched, so builds and unit tests are
unaffected.

This branch was previously deployed

1 inactive deployment
integration — f3a7bfe5 Deployed Nov 28, 2025 by rogerbarreto via dotnet-build-and-test (8.0, ubuntu-latest, Release, true, integration) #30135
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Reviewers

@rogerbarreto Roger Barreto (rogerbarreto) rogerbarreto approved these changes
@SergeyMenshykh SergeyMenshykh SergeyMenshykh approved these changes
+1 more reviewer
@markwallace-microsoft Mark Wallace (markwallace-microsoft) markwallace-microsoft approved these changes
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New Feature: .NET Gemini 3.0 Thinking Level parameter

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