diff --git a/packages/agent-core/script/build.ts b/packages/agent-core/script/build.ts
index 77b4ef4716..8d2c9273dd 100755
--- a/packages/agent-core/script/build.ts
+++ b/packages/agent-core/script/build.ts
@@ -27,6 +27,30 @@ async function ensureZeeDependencies() {
   await $`pnpm install --prod --ignore-scripts`.cwd(zeeRoot)
 }
 
+function resolveStanleyRuntime(): string | undefined {
+  const configured = process.env.STANLEY_PYTHON_RUNTIME
+  if (configured && fs.existsSync(configured)) return configured
+  const pyenvRoot = process.env.PYENV_ROOT
+  const pyenvVersion = process.env.PYENV_VERSION
+  if (pyenvRoot && pyenvVersion) {
+    const candidate = path.join(pyenvRoot, "versions", pyenvVersion)
+    if (fs.existsSync(candidate)) return candidate
+  }
+  return undefined
+}
+
+function ensureStanleyRuntime() {
+  const runtimeRoot = resolveStanleyRuntime()
+  if (!runtimeRoot) return
+  const destRoot = path.join(stanleyRoot, ".python-runtime")
+  if (fs.existsSync(destRoot)) return
+  console.log("bundling stanley python runtime")
+  fs.cpSync(runtimeRoot, destRoot, {
+    recursive: true,
+    dereference: true,
+  })
+}
+
 function getStanleyRequirementsFile(): string | undefined {
   const locked = path.join(stanleyRoot, "requirements-lock.txt")
   if (fs.existsSync(locked)) return locked
@@ -75,7 +99,7 @@ async function ensureStanleyDependencies() {
     .then((v) => v.trim())
   const [major, minor] = pythonVersion.split(".").map((v) => Number(v))
   const supportsOpenbb = Number.isFinite(major) && Number.isFinite(minor) ? major < 3 || (major === 3 && minor < 14) : true
-  const deps = supportsOpenbb ? ["openbb==4.6.0", "yfinance==0.2.50"] : ["yfinance==0.2.50"]
+  const deps = supportsOpenbb ? ["openbb==4.6.0", "yfinance==0.2.66"] : ["yfinance==0.2.66"]
 
   if (!fs.existsSync(constraintsPath)) {
     fs.writeFileSync(constraintsPath, deps.join("\n"))
@@ -239,6 +263,7 @@ if (fs.existsSync(zeeRoot)) {
 }
 if (fs.existsSync(stanleyRoot)) {
   await ensureStanleyDependencies()
+  ensureStanleyRuntime()
 }
 
 for (const item of targets) {
diff --git a/src/domain/stanley/tools.ts b/src/domain/stanley/tools.ts
index 62cbdcb8c2..bbf0b377af 100644
--- a/src/domain/stanley/tools.ts
+++ b/src/domain/stanley/tools.ts
@@ -31,9 +31,19 @@ function resolvePersonaRepo(name: string): string {
 function resolveStanleyCli(): { python: string; cliPath: string; pythonPath?: string } {
   const repo = process.env.STANLEY_REPO || resolvePersonaRepo("stanley");
   const pythonPath = process.env.STANLEY_PYTHONPATH || (existsSync(join(repo, ".python")) ? join(repo, ".python") : undefined);
+  const runtimePython = join(repo, ".python-runtime", "bin", "python3");
+  const runtimePythonAlt = join(repo, ".python-runtime", "bin", "python3.13");
+  const bundledPython = existsSync(runtimePython)
+    ? runtimePython
+    : existsSync(runtimePythonAlt)
+      ? runtimePythonAlt
+      : undefined;
   const cliPath = process.env.STANLEY_CLI || join(repo, "scripts", "stanley_cli.py");
   const venvPython = join(repo, ".venv", "bin", "python");
-  const python = process.env.STANLEY_PYTHON || (pythonPath ? "python3" : existsSync(venvPython) ? venvPython : "python3");
+  const python =
+    process.env.STANLEY_PYTHON ||
+    bundledPython ||
+    (pythonPath ? "python3" : existsSync(venvPython) ? venvPython : "python3");
   return { python, cliPath, pythonPath };
 }
 
diff --git a/src/mcp/servers/portfolio.ts b/src/mcp/servers/portfolio.ts
index 5341f01184..70a3a1444f 100644
--- a/src/mcp/servers/portfolio.ts
+++ b/src/mcp/servers/portfolio.ts
@@ -36,9 +36,19 @@ function resolvePersonaRepo(name: string): string {
 function resolveStanleyCli(): { python: string; cliPath: string; pythonPath?: string } {
   const repo = process.env.STANLEY_REPO || resolvePersonaRepo("stanley");
   const pythonPath = process.env.STANLEY_PYTHONPATH || (existsSync(join(repo, ".python")) ? join(repo, ".python") : undefined);
+  const runtimePython = join(repo, ".python-runtime", "bin", "python3");
+  const runtimePythonAlt = join(repo, ".python-runtime", "bin", "python3.13");
+  const bundledPython = existsSync(runtimePython)
+    ? runtimePython
+    : existsSync(runtimePythonAlt)
+      ? runtimePythonAlt
+      : undefined;
   const cliPath = process.env.STANLEY_CLI || join(repo, "scripts", "stanley_cli.py");
   const venvPython = join(repo, ".venv", "bin", "python");
-  const python = process.env.STANLEY_PYTHON || (pythonPath ? "python3" : existsSync(venvPython) ? venvPython : "python3");
+  const python =
+    process.env.STANLEY_PYTHON ||
+    bundledPython ||
+    (pythonPath ? "python3" : existsSync(venvPython) ? venvPython : "python3");
   return { python, cliPath, pythonPath };
 }