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fix: Expose the MCP child process PID as an accessible property in StdioClientTransport #455

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Merged
merged 4 commits into from
Jun 30, 2025
Merged

fix: Expose the MCP child process PID as an accessible property in StdioClientTransport #455

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59fb484
fix: Expose the MCP child process PID as an accessible property in St…
XiaofuHuang May 6, 2025
7e134f2
test: add ut of chile process pod in StdioClientTransport
XiaofuHuang May 6, 2025
d154914
fix: change pid return type from undefined to be null
May 6, 2025
0db4407
Merge branch 'main' into xiaofhua/pid-StdioClientTransport
ihrpr Jun 30, 2025
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9 changes: 9 additions & 0 deletions src/client/stdio.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -59,3 +59,12 @@ test("should read messages", async () => {

await client.close();
});

test("should return child process pid", async () => {
const client = new StdioClientTransport(serverParameters);

await client.start();
expect(client.pid).not.toBeNull();
await client.close();
expect(client.pid).toBeNull();
});
9 changes: 9 additions & 0 deletions src/client/stdio.ts
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Expand Up @@ -185,6 +185,15 @@ export class StdioClientTransport implements Transport {
return this._process?.stderr ?? null;
}

/**
* The child process pid spawned by this transport.
*
* This is only available after the transport has been started.
*/
get pid(): number | null {
return this._process?.pid ?? null;
}

private processReadBuffer() {
while (true) {
try {
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