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Parse tool-input-start and tool-input-delta from the AI SDK fullStream to show shimmer actions immediately when the model starts a tool call, then refine with the specific file path or command as soon as it appears in the streamed JSON arguments—before the full content is generated. Also forward toolCallId and bash stdout/stderr/exitCode in tool-result SSE events for richer client-side handling.
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Summary
tool-input-startandtool-input-deltaevents from the AI SDKfullStreamto show shimmer actions immediately when the model begins generating a tool callwriteFile/readFile), command (bash), or query (web_search) from the streamed JSON arguments as soon as it appears — well before the full content is generatedtoolCallIdand bashstdout/stderr/exitCodeintool-resultSSE events for richer client-side handlingBefore: The shimmer action (e.g. "Writing components/Chart.tsx") only appeared after the model finished generating the entire tool call arguments (including the full file content), then flashed briefly for ~700ms before clearing.
After: The shimmer appears as soon as the model starts a tool call with a generic label, then refines to the specific file path or command within milliseconds as the first few characters of the JSON arguments stream in. The action is visible for the entire duration of argument generation + tool execution.
Test plan
tsc --noEmit)npm test)writeFile— verify shimmer shows specific path early, not just after code is writtenbash— verify shimmer shows specific command early