Fix samples to work with foundry-local-sdk 1.2.1

[samuel100]

Summary

Patches across Python / JS / C# / Rust samples so they run cleanly against the latest foundry-local-sdk 1.2.0 release. Verified by running every affected sample end-to-end on macOS (arm64).

Changes

Python — empty-choices guard on streaming chat (3 samples)

The final OpenAI SSE chunk now contains an empty choices array (just finish_reason and usage), which crashed three samples with IndexError on chunk.choices[0]. Added if not chunk.choices: continue guard.

• samples/python/native-chat-completions/src/app.py
• samples/python/tutorial-chat-assistant/src/app.py
• samples/python/web-server/src/app.py

JS — API mismatches and readline EOF handling

• samples/js/tutorial-tool-calling/app.js — chatClient.completeChat in SDK 1.2.0 takes the tools array directly as its second argument, not wrapped in { tools }. Both call sites updated.
• samples/js/tutorial-tool-calling/app.js and samples/js/tutorial-chat-assistant/app.js — askQuestion now resolves to 'quit' when readline emits close (e.g. on stdin EOF) instead of throwing ERR_USE_AFTER_CLOSE.
• samples/js/chat-and-audio-foundry-local/src/app.js — swap chat model from phi-3.5-mini to qwen2.5-0.5b so the sample runs against the smaller default catalog model.

C# — Betalgo package pin (4 tutorial samples fixed by one line)

samples/cs/Directory.Packages.props pinned Betalgo.Ranul.OpenAI = 9.2.0, but that version removed the ReasoningEfforts type and changed AudioCreateTranscriptionRequest.ResponseFormat. The 1.2.0 SDK reflects on these types in its JsonSerializationContext, throwing TypeLoadException/MissingMethodException. Pinned down to 9.1.0 (the version the SDK transitively requires), which fixes all 4 tutorial samples that explicitly depend on Betalgo.

Rust — share model cache across tutorials (4 samples)

Each Rust tutorial set its own app_name (tool-calling-app, note-taker, chat-assistant, doc-summarizer), which scopes the cache directory separately and forces re-download of already-cached models. Standardized on foundry_local_samples so the samples share the cache:

• samples/rust/tutorial-tool-calling/src/main.rs
• samples/rust/tutorial-voice-to-text/src/main.rs
• samples/rust/tutorial-chat-assistant/src/main.rs
• samples/rust/tutorial-document-summarizer/src/main.rs

Testing

Ran the full samples matrix on macOS arm64 against foundry-local-sdk 1.2.0:

Lang	Passed	Skipped	Failed
Python	13	0	0
JS	11	4	0
C#	12	0	0
Rust	7	0	0 (3 unverified, source-only patches)

JS skips are for Windows-only WinML samples, an Electron GUI sample, and samples that pull phi-4-mini (not in the macOS test cache).

Note for macOS / Linux users: the JS samples should be installed with npm install --omit=optional to skip the foundry-local-sdk-winml postinstall, which fetches a Windows-only NuGet and leaves the SDK unable to locate Microsoft.AI.Foundry.Local.Core.dylib.

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Project	Deployment	Actions	Updated (UTC)
foundry-local	Ready	Preview, Comment	Jun 5, 2026 9:40am

[Copilot]

Pull request overview

Updates multi-language samples so they run cleanly against foundry-local-sdk 1.2.0 by addressing SDK surface changes and runtime behavior differences (streaming chunk shape, JS tools parameter shape, and sample dependency / cache configuration).

Changes:

• Python: guard against streaming chunks that contain an empty choices array.
• JS: align completeChat tool-calling signature and make readline input handling more resilient to stdin EOF/close.
• C#/Rust: pin a compatible Betalgo package version for samples and standardize Rust app_name to share the model cache across tutorials.

Reviewed changes

Copilot reviewed 11 out of 12 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
samples/rust/tutorial-voice-to-text/src/main.rs	Standardizes Rust sample app_name to share the model cache.
samples/rust/tutorial-tool-calling/src/main.rs	Standardizes Rust sample app_name to share the model cache.
samples/rust/tutorial-document-summarizer/src/main.rs	Standardizes Rust sample app_name to share the model cache.
samples/rust/tutorial-chat-assistant/src/main.rs	Standardizes Rust sample app_name to share the model cache.
samples/python/web-server/src/app.py	Adds an empty-choices guard for streaming chat output.
samples/python/tutorial-chat-assistant/src/app.py	Adds an empty-choices guard for streaming chat output.
samples/python/native-chat-completions/src/app.py	Adds an empty-choices guard for streaming chat output.
samples/js/tutorial-tool-calling/app.js	Updates tool-calling API usage and improves readline EOF handling (needs a small race-condition fix).
samples/js/tutorial-chat-assistant/app.js	Improves readline EOF handling (needs a small race-condition fix).
samples/js/chat-and-audio-foundry-local/src/app.js	Switches default chat model alias to qwen2.5-0.5b.
samples/cs/Directory.Packages.props	Pins Betalgo dependency to a version compatible with the samples/SDK.