1 files changed, 45 insertions, 0 deletions
diff --git a/packages/cli/src/render.ts b/packages/cli/src/render.ts
new file mode 100644
index 0000000..1853963
--- /dev/null
+++ b/packages/cli/src/render.ts
@@ -0,0 +1,45 @@
+/**
+ * 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;
+	}
+}