Canvas SDK: post-merge review followups (PR #1401)#1420
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Cross-language: - Mark canvas surface as Experimental in Rust (doc-comment warning), Node (JSDoc @experimental tag), Python (module + per-type comment), and Go (per-symbol doc comment). .NET already had [Experimental(Diagnostics.Experimental)]. Rust: - Add Default impls (via #[derive(Default)]) to CanvasDeclaration, CanvasOpenContext, CanvasActionContext, and CanvasLifecycleContext for forward-proofing against new optional members. Node: - Extract CanvasHostCapabilities as a named exported interface (previously inlined into CanvasHostContext). Matches the other SDKs. .NET: - Rename CanvasError -> CanvasException (C# *Exception convention). - Convert init-only setters to set on canvas context types (consistent with the rest of the SDK). - Simplify CanvasErrorHelpers.Build using SerializeToElement with a JsonObject + TypesJsonContext; drop the bespoke CanvasErrorPayload type and now-empty CanvasJsonContext. - Cache JsonElement for the JSON literal 'null' to avoid parsing on every canvas action that returns void/null. - Document why JsonRpc.HandleIncomingMethodAsync unwraps TargetInvocationException (handlers are dispatched via reflection). Co-authored-by: Copilot <[email protected]>
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Pull request overview
This PR applies post-merge follow-ups to the Canvas SDK surface (added in #1401), focusing on cross-language “experimental” labeling and a set of .NET API/implementation cleanups for consistency and reduced allocations.
Changes:
- Mark the canvas surface as Experimental across Rust/Node/Python/Go (Rust rustdoc warnings, Node JSDoc
@experimental, Python module note + per-type comments, Go per-symbol doc comments). - Rust: add
Defaultderives to several canvas declaration/context types to ease forward-compatible construction as optional fields evolve. - .NET: rename
CanvasError→CanvasException, switch canvas context properties frominittoset, simplify error payload construction viaJsonObject+TypesJsonContext, cache anullJsonElement, and documentTargetInvocationExceptionunwrapping rationale in JSON-RPC dispatch.
Show a summary per file
| File | Description |
|---|---|
| rust/src/canvas.rs | Adds experimental rustdoc warnings and derives Default for canvas declaration/context types. |
| python/copilot/canvas.py | Adds module-level experimental note and per-type experimental comments. |
| nodejs/src/index.ts | Re-exports CanvasHostCapabilities from the public Node entrypoint. |
| nodejs/src/canvas.ts | Adds module/type @experimental docs and extracts CanvasHostCapabilities into a named exported interface. |
| go/canvas.go | Adds per-symbol experimental doc comments for the Go canvas surface. |
| dotnet/test/Unit/CanvasTests.cs | Updates unit tests for CanvasError → CanvasException rename. |
| dotnet/src/Types.cs | Adds JsonObject to source-generated serialization context for canvas error payloads. |
| dotnet/src/Session.cs | Updates exception handling for CanvasException and caches a null JsonElement for action results. |
| dotnet/src/JsonRpc.cs | Documents (and continues) unwrapping TargetInvocationException during handler dispatch. |
| dotnet/src/Canvas.cs | Renames CanvasError → CanvasException, converts context init setters to set, and simplifies error payload generation. |
Copilot's findings
- Files reviewed: 10/10 changed files
- Comments generated: 0
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Main's #1413 aligned canvas with the codegen pipeline. Re-applied followups on top: - Re-applied Experimental markers to hand-written canvas surfaces (Rust doc-comments, Node @experimental JSDoc, Python module/class docstrings, Go per-symbol doc comments). - Re-applied Default derive on CanvasDeclaration in Rust. - Re-applied .NET CanvasError -> CanvasException rename across Canvas.cs, Session.cs, and CanvasTests.cs. - Re-applied CanvasErrorHelpers.Build simplification (JsonObject + TypesJsonContext.Default.JsonObject); removed CanvasErrorPayload and CanvasJsonContext partial. - Re-applied Session.cs NullJsonElement cache and simplified SerializeActionResult. - Updated index.ts re-export to CanvasHostContextCapabilities to match codegen rename. Co-authored-by: Copilot <[email protected]>
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Generated by SDK Consistency Review Agent for issue #1420 · ● 7.4M
…01-followups # Conflicts: # rust/src/canvas.rs
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Cross-SDK Consistency Review ✅Reviewed all 5 affected SDK implementations (Node.js, Python, Go, Rust, .NET). No consistency issues found — this PR is well-coordinated. Summary
Notes
No cross-SDK action items required.
|
SteveSandersonMS
approved these changes
May 28, 2026
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Follow-ups to the canvas SDK surface added in #1401. Scope: cross-language polish + .NET cleanups. Excludes the
Canvasescapability rename (separate session) and E2E canvas tests (separate session).Cross-language
@experimental), Python (module + per-type comment), and Go (per-symbol doc comment). .NET already had[Experimental(Diagnostics.Experimental)].Rust
Defaultimpls (via#[derive(Default)]) toCanvasDeclaration,CanvasOpenContext,CanvasActionContext, andCanvasLifecycleContextfor forward-proofing against new optional members.Node
CanvasHostCapabilitiesas a named exported interface; matches the other SDKs..NET
CanvasError→CanvasException(C#*Exceptionconvention).initsetters →seton canvas context types (consistent with the rest of the SDK).CanvasErrorHelpers.BuildusingSerializeToElementwith aJsonObject+TypesJsonContext; drop the bespokeCanvasErrorPayloadtype and now-emptyCanvasJsonContext.JsonElementfor the JSON literalnullto avoidJsonDocument.Parseon every canvas action that returns void/null.JsonRpc.HandleIncomingMethodAsyncunwrapsTargetInvocationException(handlers are dispatched via reflection /DynamicInvoke).Validation
cargo fmt --check,cargo clippy --all-features --all-targets -- -D warnings,cargo test --all-features(129 passed).npm run typecheck,npm run lint(0 errors),vitest run(86 passed).gofmt -l .,go build ./...,go vet ./..., unit tests pass.ruff check,ty check copilot(all clean), unit tests (80 passed).dotnet format --verify-no-changes,dotnet build -f net8.0, canvas tests pass (9/9).Related: #1401
Co-authored-by: Copilot [email protected]