withSandbox fails with "never called provide()" when the sandbox has no workspace
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描述
TanStack AI version
@tanstack/ai 1.1.0, @tanstack/ai-sandbox 1.1.0, @tanstack/ai-sandbox-local-process 1.0.0
Framework/Library version
Node.js 26.13.0 and 24.22.2. No UI framework.
Describe the bug and the steps to reproduce it
workspace is optional on SandboxConfig, but a sandbox without one fails at the first chat():
Middleware "sandbox" declares it provides "sandbox-projection" but never called provide() in setup().
Expected: the run works and projects nothing. Or, if a workspace is necessary, the type makes workspace required.
Steps. Run pnpm install && pnpm start. It needs no API key, because the model is fakeText from @tanstack/ai/testing.
const sandbox = defineSandbox({
id: 'no-workspace',
provider: localProcessSandbox(),
// no `workspace`
})
chat({
adapter, // fakeText() with one scripted answer
threadId: 'thread-1',
messages: [{ role: 'user', content: 'hi' }],
middleware: [withSandbox(sandbox)],
})
Output, the same in 3 of 3 runs:
FAILED: Middleware "sandbox" declares it provides "sandbox-projection" but never called provide() in setup().
We hit this with a sandbox that resumes an existing provider sandbox, which already holds its files. A workaround is workspace: defineWorkspace({ source: { type: 'none' } }). With that, the same script finishes.
Suspected cause (not confirmed). withSandbox lists ProjectionCapability in provides (middleware.ts), but it calls provideWorkspaceProjection only inside if (workspace !== undefined).
Your Minimal, Reproducible Example - (Sandbox Highly Recommended)
https://github.com/adelrodriguez/tanstack-ai-repros/tree/main/withsandbox-without-workspace
Screenshots or Videos (Optional)
No response
Do you intend to try to help solve this bug with your own PR?
Maybe, I'll investigate and start debugging
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