diff --git a/bin/gstack-config b/bin/gstack-config
index 01defcef86..d43e554d18 100755
--- a/bin/gstack-config
+++ b/bin/gstack-config
@@ -381,18 +381,20 @@ case "${1:-}" in
 fi
 mv "$DETECTION_FILE.tmp" "$DETECTION_FILE"
 
- # Summarize for the user. Use python (already required elsewhere) to
- # parse the JSON portably; fall back to grep if python is unavailable.
- PYTHON_CMD=$(command -v python3 || command -v python || true)
- if [ -n "$PYTHON_CMD" ]; then
- STATUS=$("$PYTHON_CMD" -c "import json,sys; d=json.load(open('$DETECTION_FILE')); print(d.get('gbrain_local_status','unknown'))" 2>/dev/null || echo unknown)
- VERSION=$("$PYTHON_CMD" -c "import json,sys; d=json.load(open('$DETECTION_FILE')); print(d.get('gbrain_version') or 'unknown')" 2>/dev/null || echo unknown)
- else
- STATUS=$(grep -o '"gbrain_local_status":[[:space:]]*"[^"]*"' "$DETECTION_FILE" | sed 's/.*"\([^"]*\)"$/1円/')
- VERSION=$(grep -o '"gbrain_version":[[:space:]]*"[^"]*"' "$DETECTION_FILE" | sed 's/.*"\([^"]*\)"$/1円/')
- [ -z "$STATUS" ] && STATUS=unknown
- [ -z "$VERSION" ] && VERSION=unknown
+ # Summarize for the user. Prefer the shell parser because Git Bash can put
+ # native Windows Python first on PATH, and that Python cannot open MSYS-style
+ # /c/... paths. Keep Python only as a fallback if the flat-field grep misses.
+ STATUS=$(grep -o '"gbrain_local_status":[[:space:]]*"[^"]*"' "$DETECTION_FILE" | sed 's/.*"\([^"]*\)"$/1円/' | head -1 || true)
+ VERSION=$(grep -o '"gbrain_version":[[:space:]]*"[^"]*"' "$DETECTION_FILE" | sed 's/.*"\([^"]*\)"$/1円/' | head -1 || true)
+ if [ -z "$STATUS" ] || [ -z "$VERSION" ]; then
+ PYTHON_CMD=$(command -v python3 || command -v python || true)
+ if [ -n "$PYTHON_CMD" ]; then
+ [ -z "$STATUS" ] && STATUS=$("$PYTHON_CMD" -c "import json,sys; d=json.load(open('$DETECTION_FILE')); print(d.get('gbrain_local_status','unknown'))" 2>/dev/null || echo unknown)
+ [ -z "$VERSION" ] && VERSION=$("$PYTHON_CMD" -c "import json,sys; d=json.load(open('$DETECTION_FILE')); print(d.get('gbrain_version') or 'unknown')" 2>/dev/null || echo unknown)
+ fi
 fi
+ [ -z "$STATUS" ] && STATUS=unknown
+ [ -z "$VERSION" ] && VERSION=unknown
 
 case "$STATUS" in
 ok)
diff --git a/test/gstack-config-gbrain-refresh.test.ts b/test/gstack-config-gbrain-refresh.test.ts
new file mode 100644
index 0000000000..9ca764d09b
--- /dev/null
+++ b/test/gstack-config-gbrain-refresh.test.ts
@@ -0,0 +1,69 @@
+/**
+ * Regression coverage for #1967: Git Bash on Windows can put a native Windows
+ * Python first on PATH. That Python cannot open MSYS-style /c/... paths, so
+ * gstack-config must not let a Python JSON parse failure mask a valid detection
+ * file as local-status: unknown.
+ */
+import { describe, test, expect, beforeEach, afterEach } from "bun:test";
+import * as fs from "fs";
+import * as os from "os";
+import * as path from "path";
+import { spawnSync } from "child_process";
+
+const ROOT = path.resolve(import.meta.dir, "..");
+const SOURCE_CONFIG = path.join(ROOT, "bin", "gstack-config");
+
+let tmp: string;
+let binDir: string;
+let home: string;
+
+function writeExecutable(file: string, content: string) {
+ fs.writeFileSync(file, content, { mode: 0o755 });
+}
+
+function runGbrainRefresh(): { code: number; out: string; err: string } {
+ const r = spawnSync(path.join(binDir, "gstack-config"), ["gbrain-refresh"], {
+ encoding: "utf8",
+ env: {
+ ...process.env,
+ HOME: home,
+ GSTACK_HOME: home,
+ GSTACK_STATE_ROOT: home,
+ PATH: `${binDir}${path.delimiter}${process.env.PATH ?? ""}`,
+ },
+ });
+ return { code: r.status ?? 0, out: r.stdout ?? "", err: r.stderr ?? "" };
+}
+
+beforeEach(() => {
+ tmp = fs.mkdtempSync(path.join(os.tmpdir(), "gbrain-refresh-"));
+ binDir = path.join(tmp, "bin");
+ home = path.join(tmp, "home");
+ fs.mkdirSync(binDir, { recursive: true });
+ fs.mkdirSync(home, { recursive: true });
+ fs.copyFileSync(SOURCE_CONFIG, path.join(binDir, "gstack-config"));
+ fs.chmodSync(path.join(binDir, "gstack-config"), 0o755);
+});
+
+afterEach(() => {
+ fs.rmSync(tmp, { recursive: true, force: true });
+});
+
+describe("gstack-config gbrain-refresh", () => {
+ test("does not report unknown when PATH python cannot open the detection file", () => {
+ writeExecutable(
+ path.join(binDir, "gstack-gbrain-detect"),
+ `#!/usr/bin/env bash\nprintf '%s\\n' '{"gbrain_on_path":true,"gbrain_local_status":"ok","gbrain_version":"0.35.8.0"}'\n`,
+ );
+ writeExecutable(
+ path.join(binDir, "python3"),
+ `#!/usr/bin/env bash\necho "FileNotFoundError: native Windows Python cannot open this MSYS path">&2\nexit 1\n`,
+ );
+
+ const r = runGbrainRefresh();
+
+ expect(r.code).toBe(0);
+ expect(r.out).toContain("Detected gbrain v0.35.8.0");
+ expect(r.out).not.toContain("local-status: unknown");
+ });
+});
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