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fix: await stdout writes for tool output #209

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fix: await stdout writes for tool output #209

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16 changes: 13 additions & 3 deletions src/commands/call.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -37,6 +37,15 @@ export interface CallOptions {
configPath?: string;
}

async function writeStdout(text: string): Promise<void> {
await new Promise<void>((resolve, reject) => {
process.stdout.write(`${text}\n`, (error) => {
if (error) reject(error);
else resolve();
});
});
}

/**
* Parse target into server and tool name
*/
Expand Down Expand Up @@ -161,9 +170,10 @@ export async function callCommand(options: CallOptions): Promise<void> {
try {
const result = await connection.callTool(toolName, args);

// Extract text content from MCP response for CLI-friendly output
// Uses formatToolResult which extracts text from MCP content array
console.log(formatToolResult(result));
// Extract text content from MCP response for CLI-friendly output.
// Write directly to stdout and await the callback so large piped output
// does not get truncated if the process exits immediately afterwards.
await writeStdout(formatToolResult(result));
} catch (error) {
// Try to get available tools for better error message
let availableTools: string[] | undefined;
Expand Down