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Support callable backends and streaming in the exec tool #46

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Merged
aron-cf merged 10 commits into from
Aug 4, 2026
+859 −33
Merged

Support callable backends and streaming in the exec tool #46

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fca74c1
computer: support callable backends in the exec tool
aron-cf Aug 3, 2026
e6b16b5
computer: stream exec output from the tool as it arrives
aron-cf Aug 3, 2026
d27d9d1
computer: fold the callable result onto the exit event
aron-cf Aug 3, 2026
bf1cd3e
computer: read callable state from the runtime, not tool options
aron-cf Aug 3, 2026
e8da151
computer: drop the standalone result stream event
aron-cf Aug 4, 2026
4797e68
computer: bound and coalesce the exec tool's streamed output
aron-cf Aug 4, 2026
fd46bb5
computer: name the exit code field in the exec tool's stream event
aron-cf Aug 4, 2026
b8542d4
computer: validate the exec tool input with a JSON-value schema
aron-cf Aug 4, 2026
92028ec
computer: exercise the exec tool against a real Workspace
aron-cf Aug 4, 2026
154bbc6
computer: kill the backend when the exec tool turn aborts
aron-cf Aug 4, 2026
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10 changes: 9 additions & 1 deletion packages/computer/src/runtime/runtime.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -34,6 +34,14 @@ export class WorkspaceRuntime {
this.#options = options;
}

// Whether the named backend accepts a structured `input` value and
// returns a structured result. Consumers such as the exec tool ask
// this to know whether a backend is callable without the caller
// having to declare it a second time.
isCallable(id: string): boolean {
return this.#options.callableBackendIds.has(id);
}

exec(source: string): Promise<WorkspaceRuntimeExecHandle<undefined>>;
exec(
source: string,
Expand All @@ -49,7 +57,7 @@ export class WorkspaceRuntime {
): Promise<WorkspaceRuntimeExecHandle<E>> {
if (options.id !== undefined) assertExecutionId(options.id);
const backend = this.#backend(options.backend);
if (options.input !== undefined && !this.#options.callableBackendIds.has(backend)) {
if (options.input !== undefined && !this.isCallable(backend)) {
throw new Error(notCallableMessage(backend));
}
const runtime = await this.#options.backendHandle(backend);
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