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fix(mcp): write firebase-debug.log to ~/.firebase/ instead of cwd #9998

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fix(mcp): write firebase-debug.log to ~/.firebase/ instead of cwd #9998

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2c770de
fix(mcp): write firebase-debug.log to ~/.firebase/ instead of cwd
VishnuVardhanBR Mar 2, 2026
dbc3899
refactor(mcp): use async mkdir instead of mkdirSync
VishnuVardhanBR Mar 2, 2026
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1 change: 1 addition & 0 deletions CHANGELOG.md
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Original file line number Diff line number Diff line change
@@ -1,2 +1,3 @@
- Fixed MCP server writing `firebase-debug.log` to the user's project directory; logs now go to `~/.firebase/firebase-debug.log` instead. (#9982)
- Updated the functions.config deprecation notice from March 2026 to March 2027 (#9941)
- Detects when App Hosting fails to deploy, returning an error. (#8866)
10 changes: 8 additions & 2 deletions src/bin/mcp.ts
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@@ -1,6 +1,8 @@
#!/usr/bin/env node

import { resolve } from "path";
import { resolve, join } from "path";
import { mkdir } from "fs/promises";
import { homedir } from "os";
import { parseArgs } from "util";
import { useFileLogger } from "../logger";
import { FirebaseMcpServer } from "../mcp/index";
Expand Down Expand Up @@ -83,7 +85,11 @@ export async function mcp(): Promise<void> {
if (earlyExit) return;

process.env.IS_FIREBASE_MCP = "true";
useFileLogger();
// Write debug logs to ~/.firebase/ to avoid polluting the user's project directory.
// See: https://github.com/firebase/firebase-tools/issues/9982
const mcpLogDir = join(homedir(), ".firebase");
await mkdir(mcpLogDir, { recursive: true });
useFileLogger(join(mcpLogDir, "firebase-debug.log"));
const activeFeatures = (values.only || "")
.split(",")
.map((f) => f.trim())
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