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fix: flush large piped tool output #246

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fix: flush large piped tool output #246

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11 changes: 10 additions & 1 deletion src/commands/call.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,7 @@
* - Errors always go to stderr
*/

import { once } from 'node:events';
import {
type McpConnection,
debug,
Expand Down Expand Up @@ -104,6 +105,14 @@ async function parseArgs(
}
}

async function writeStdout(output: string): Promise<void> {
if (process.stdout.write(`${output}\n`)) {
return;
}

await once(process.stdout, 'drain');
}

/**
* Execute the call command
*/
Expand Down Expand Up @@ -163,7 +172,7 @@ export async function callCommand(options: CallOptions): Promise<void> {

// Extract text content from MCP response for CLI-friendly output
// Uses formatToolResult which extracts text from MCP content array
console.log(formatToolResult(result));
await writeStdout(formatToolResult(result));
} catch (error) {
// Try to get available tools for better error message
let availableTools: string[] | undefined;
Expand Down