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/**
* Pure event renderer — zero I/O.
*
* Maps an AgentEvent to optional stdout/stderr strings.
* Consumers write these to process.stdout / process.stderr.
*/
import type { AgentEvent } from "@dispatch/transport-contract";
interface RenderOpts {
readonly showReasoning: boolean;
}
interface RenderOutput {
readonly stdout?: string;
readonly stderr?: string;
}
export function renderEvent(e: AgentEvent, opts: RenderOpts): RenderOutput | undefined {
switch (e.type) {
case "text-delta":
return { stdout: e.delta };
case "reasoning-delta":
return opts.showReasoning ? { stdout: e.delta } : undefined;
case "tool-call":
return { stdout: `\n[tool] ${e.toolName} ${JSON.stringify(e.input)}\n` };
case "tool-output":
return { stdout: e.data };
case "tool-result":
return {
stdout: `[tool:${e.toolName}]${e.isError ? " ERROR" : ""} ${e.content}\n`,
};
case "usage":
return {
stdout: `\n[usage] in=${e.usage.inputTokens} out=${e.usage.outputTokens}\n`,
};
case "error":
return { stderr: `[error] ${e.message}\n` };
case "status":
case "turn-start":
case "turn-sealed":
case "done":
return undefined;
}
}
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