Canvas extensibility parity: Python, Go, .NET, Java

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#1,373 opened on May 22, 2026 0 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 4/5
Estimated time: 3-5 days
Newbie friendliness: 45/100

Issue type: Feature
Clarity: Mostly clear
Activity status: Quiet
Tech stack: csharp, go, java, node.js, python, rust, typescript
Domain: api, developer-experience

Research direction

Start by reading PR #1372, using the Node implementation as the canonical reference and the Rust diff where the TypeScript schema is ambiguous. Compare the corresponding SDK entry points in python/copilot/, go/, dotnet/src/, and java/src/ before adding the listed canvas configuration, factory, and lifecycle surfaces with each language’s naming conventions. Done means all four SDK checklists provide parity with the stabilized contract.

Written by the indexing model from the issue text.

Description

enhancement

PR #1372 adds canvas extensibility (Canvas / createCanvas, SessionConfig.canvases, requestCanvasRenderer, requestExtensions, and ResumeSessionConfig.openCanvasInstances, plus the session.canvas.* lifecycle events and hostExtension.invoke RPC dispatch) to the Node and Rust SDKs only.

Once the wire contract has stabilized through real usage by the immediate consumers (Copilot CLI runtime, Tauri app, canvas v1 testing extension), the same surface needs to be brought to the remaining SDKs for parity:

Python (python/copilot/): canvases, request_canvas_renderer, request_extensions, open_canvas_instances, plus Canvas / create_canvas factory
Go (go/): Canvases, RequestCanvasRenderer, RequestExtensions, OpenCanvasInstances, plus Canvas / CreateCanvas
.NET (dotnet/src/): Canvases, RequestCanvasRenderer, RequestExtensions, OpenCanvasInstances, plus Canvas / CreateCanvas
Java (java/src/): equivalent surface following Java naming conventions

The Node implementation in PR #1372 is the canonical reference. Treat the Rust diff there as a co-canonical spec where the TypeScript schema is ambiguous.

Dominant language: Java
Stars: 10.5k
Forks: 1.5k
Avg merge: 1d 9h
Merged PRs (30d): 131

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