[pcbeingused333]

ReadPdfFn falls back to google-ai / gemini-2.0-flash when FileHandler:Pdf:Reading has no provider and model, and the sample appsettings.json sets the same model for PDF reading. Google shut gemini-2.0-flash down on June 1, 2026 (deprecations), so reading a PDF with the default settings now gets an error from the Gemini API.

This PR changes:

• ReadPdfFn.GetLlmProviderModel: the fallback model is gemini-3.8-flash, the current stable Flash model.
• src/WebStarter/appsettings.json: FileHandler:Pdf:Reading:Model and the google-ai chat model entry it points to (name, and costs per 1K tokens from Google's pricing page: $0.75 input, $0.075 cached input and $3.75 output per 1M tokens, the prices until 2026-12-31).
• Test: ReadPdfFnDefaultModelTests checks the fallback. It needs a project reference from BotSharp.Core.UnitTests to BotSharp.Plugin.FileHandler.

The deprecations page names gemini-3.6-flash as the replacement, but gemini-3.8-flash is the current stable Flash model (Vertex AI already retires 3.6 Flash on 2026-11-19), so this PR uses 3.8.

The Google provider always sends temperature (0.0 unless the conversation state sets one). Gemini 3 accepts it, but Google recommends leaving it at the default of 1.0. This PR does not change that; FileHandler:Pdf:Reading can still point PDF reading at any other provider and model.

I left the gemini-2.0-flash-exp realtime entry and the realtime test settings alone, since they are a different model.

Tests

dotnet test tests/BotSharp.Core.UnitTests: 475 passed, 1 failed. The new test fails before the change (Expected: "gemini-3.8-flash", Actual: "gemini-2.0-flash"). The failing test is SharpCacheAgentMemoryTests.GetAgent_caches_per_scope_without_adding_shared_cache_entries; it fails the same way without this change.

This change was made with Claude Code, which also wrote the test and ran the checks above.

🤖 Generated with Claude Code

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Code Review by Qodo

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PR Summary by Qodo

Replace retired Gemini PDF-reading default

🐞 Bug fix 🧪 Tests ⚙️ Configuration changes 🕐 10-20 Minutes

AI Description

• Replace the retired PDF-reading fallback with gemini-3.8-flash to restore default PDF reading.
• Align WebStarter’s PDF setting and Google AI model pricing with the new default.
• Add a unit test that guards the fallback provider and model.

Diagram

graph TD
  A["PDF settings"] --> B{"Provider and model?"}
  B -->|Yes| C["Configured model"] --> E["Chat completion"] --> F["Provider API"]
  B -->|No| D["Gemini 3.8 fallback"] --> E

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High-Level Assessment

Updating both the code fallback and sample configuration is the appropriate scoped fix: changing only configuration would leave deployments without explicit PDF settings on the retired model. The existing ability to select another provider remains intact.

Files changed (4) +34 / -6

Bug fix (1) +1 / -1

ReadPdfFn.csUse gemini-3.8-flash for unconfigured PDF reading +1/-1

Use gemini-3.8-flash for unconfigured PDF reading

• Changes the Google AI fallback model from gemini-2.0-flash to gemini-3.8-flash. Explicitly configured provider/model pairs still take precedence.

src/Plugins/BotSharp.Plugin.FileHandler/Functions/ReadPdfFn.cs

Tests (2) +28 / -0

BotSharp.Core.UnitTests.csprojReference FileHandler from the unit-test project +2/-0

Reference FileHandler from the unit-test project

• Adds the FileHandler project reference needed to instantiate ReadPdfFn in the new regression test.

tests/BotSharp.Core.UnitTests/BotSharp.Core.UnitTests.csproj

ReadPdfFnDefaultModelTests.csGuard the PDF-reading fallback selection +26/-0

Guard the PDF-reading fallback selection

• Adds a unit test that invokes the private model-selection method with empty settings and asserts the google-ai / gemini-3.8-flash fallback.

tests/BotSharp.Core.UnitTests/Plugins/ReadPdfFnDefaultModelTests.cs

Other (1) +5 / -5

appsettings.jsonAlign sample PDF settings and model costs +5/-5

Align sample PDF settings and model costs

• Points PDF reading and its Google AI chat model entry at gemini-3.8-flash. Revises the entry’s per-1K-token input, cached-input, and output costs; the separate realtime entry is unchanged.

src/WebStarter/appsettings.json