Add modelCapabilities override by SteveSandersonMS · Pull Request #1022 · github/copilot-sdk

SteveSandersonMS · 2026-04-06T17:51:13Z

Summary

Adds modelCapabilities parameter to the Node SDK's createSession and setModel APIs, allowing SDK consumers to override individual model capabilities (e.g., vision support) without specifying the full capabilities object.

Closes #994

Changes

Codegen: Regenerated RPC types from runtime schema (adds modelCapabilities to model.switchTo)
Types: Added ModelCapabilitiesOverride type, exported from index
Session: createSession and setModel accept optional modelCapabilities
E2E tests: Two tests verify vision toggle via setModel changes image processing behavior

Usage

// Override vision at session creation
const session = await client.createSession({
    model: "my-byok-model",
    provider: { type: "openai", baseUrl: "..." },
    modelCapabilities: { supports: { vision: true } },
});

// Toggle vision mid-session
await session.setModel("my-byok-model", {
    modelCapabilities: { supports: { vision: false } },
});

Testing

E2E tests run against a local runtime build and verify that:

Starting with vision disabled then enabling via setModel causes image_url content to appear
Starting with vision enabled then disabling via setModel causes image_url content to stop appearing

dotnet/test/SessionConfigTests.cs

github-actions

Generated by SDK Consistency Review Agent for issue #1022

Co-Authored-By: Copilot <223556219+Copilot@users.noreply.github.com>

Regenerated RPC types and added modelCapabilities support to Python, Go, and C# SDKs to match the Node.js implementation. All languages now support: - modelCapabilities on createSession/create_session/CreateSession - modelCapabilities on setModel/set_model/SetModel/SetModelAsync - E2E tests verifying vision toggle via setModel changes image processing Also includes: - Regenerated codegen output with proper type names (no Purple/Fluffy) - C# codegen fix to respect JSON Schema 'title' for class naming - Fix Go E2E tests for DataContent type change in session events - Fix Python generated Union import in session events Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Co-Authored-By: Copilot <223556219+Copilot@users.noreply.github.com>

- Replace foreach loops with LINQ .Where/.Any in HasImageUrlContent - Fix Python import ordering (ruff) - Apply formatter output across Node/Python Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

dotnet/test/SessionConfigTests.cs

+    [Fact]
+    public async Task VisionEnabledThenDisabledViaSetModel()
+    {
+        await File.WriteAllBytesAsync(Path.Combine(Ctx.WorkDir, "test.png"), Png1X1);


Addresses Cross-SDK Consistency Review: - Add modelCapabilities to ResumeSessionConfig Pick list - Forward modelCapabilities in session.resume RPC call Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

github-actions · 2026-04-07T09:47:41Z

Cross-SDK Consistency Review ✅

This PR adds modelCapabilities support to Node.js, Go, and .NET. Checking for Python parity:

Python already implements this feature — python/copilot/client.py and python/copilot/session.py include model_capabilities: ModelCapabilitiesOverride | None = None on create_session, resume_session, and set_model, along with the ModelCapabilitiesOverride type and _capabilities_to_dict serializer.

All four SDKs are consistent:

SDK	`createSession`	`resumeSession`	`setModel`
Node.js	✅ (this PR)	✅ (this PR)	✅
Python	✅ (pre-existing)	✅ (pre-existing)	✅ (pre-existing)
Go	✅ (this PR)	✅ (this PR)	✅ (this PR)
.NET	✅ (this PR)	✅ (this PR)	✅ (this PR)

No cross-SDK consistency issues found.

Generated by SDK Consistency Review Agent for issue #1022 · ◷

SteveSandersonMS · 2026-04-07T10:03:15Z

This PR was merged prematurely in error by the branch's upstream tracking branch being wrong.

SteveSandersonMS changed the title ~~Add modelCapabilities override to all SDK languages~~ Add modelCapabilities override Apr 6, 2026

github-code-quality bot found potential problems Apr 6, 2026

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github-actions bot reviewed Apr 6, 2026

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SteveSandersonMS and others added 2 commits April 7, 2026 10:27

Add modelCapabilities override to Node SDK

4653738

Co-Authored-By: Copilot <223556219+Copilot@users.noreply.github.com>

SteveSandersonMS force-pushed the stevesa/override-model-capabilities branch from b14e5b6 to cf12a7f Compare April 7, 2026 09:28

Update to latest release and re-run codegen

2e943bf

Co-Authored-By: Copilot <223556219+Copilot@users.noreply.github.com>

SteveSandersonMS force-pushed the stevesa/override-model-capabilities branch from cf12a7f to 2e943bf Compare April 7, 2026 09:31

Address PR review: use LINQ in C# test, fix formatting and lint

d189c79

- Replace foreach loops with LINQ .Where/.Any in HasImageUrlContent - Fix Python import ordering (ruff) - Apply formatter output across Node/Python Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

github-code-quality bot found potential problems Apr 7, 2026

View reviewed changes

dotnet/test/SessionConfigTests.cs Dismissed Show dismissed Hide dismissed

dotnet/test/SessionConfigTests.cs

[Fact]

public async Task VisionEnabledThenDisabledViaSetModel()

{

await File.WriteAllBytesAsync(Path.Combine(Ctx.WorkDir, "test.png"), Png1X1);

SteveSandersonMS and others added 2 commits April 7, 2026 10:39

Fix: forward modelCapabilities in Node.js resumeSession path

cd5244c

Addresses Cross-SDK Consistency Review: - Add modelCapabilities to ResumeSessionConfig Pick list - Forward modelCapabilities in session.resume RPC call Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Fix Go formatting (gofmt)

62bf520

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

SteveSandersonMS merged commit 62bf520 into main Apr 7, 2026
23 of 36 checks passed

SteveSandersonMS deleted the stevesa/override-model-capabilities branch April 7, 2026 09:55

SteveSandersonMS restored the stevesa/override-model-capabilities branch April 7, 2026 09:57

SteveSandersonMS mentioned this pull request Apr 7, 2026

Add modelCapabilities override to all SDK languages #1029

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SteveSandersonMS commented Apr 6, 2026 •

edited

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Summary

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github-actions bot commented Apr 7, 2026

Cross-SDK Consistency Review ✅

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SteveSandersonMS commented Apr 6, 2026 •

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