ci: match the environment with internal ones for pyink/isort/unittest

Previously submitted change is causing [Pyink error](https://github.com/google/adk-python/actions/runs/21884351396/job/63176122118) in repo because Pyink recently updated to 25.12.0.

Co-authored-by: Liang Wu <wuliang@google.com>
PiperOrigin-RevId: 868806575

.github/workflows/isort.yml

@@ -33,7 +33,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v6
         with:
-          python-version: '3.x'
+          python-version: '3.11'
 
       - name: Install isort
         run: |

.github/workflows/pyink.yml

@@ -33,7 +33,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v6
         with:
-          python-version: '3.x'
+          python-version: '3.11'
 
       - name: Install pyink
         run: |

.github/workflows/python-unit-tests.yml

@@ -25,7 +25,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.10", "3.11", "3.12", "3.13"]
+        python-version: ["3.10", "3.11", "3.12", "3.13", "3.14"]
 
     steps:
     - name: Checkout code

contributing/dev/utils/build_llms_txt.py

@@ -1,4 +1,18 @@
 #!/usr/bin/env python3
+# Copyright 2026 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 """
 build_llms_txt.py – produce llms.txt and llms-full.txt
                    – skips ```java``` blocks
@@ -6,6 +20,7 @@ build_llms_txt.py – produce llms.txt and llms-full.txt
                    – includes Python API reference from HTML files
                    – includes adk-python repository README
 """
+
 from __future__ import annotations
 
 import argparse

contributing/samples/cache_analysis/run_cache_experiments.py

@@ -344,7 +344,8 @@ async def analyze_cache_performance_from_sessions(
       print(
           "     Cache Utilization:"
           f" {cached_analysis['cache_utilization_ratio_percent']:.1f}%"
-          f" ({cached_analysis['requests_with_cache_hits']}/{cached_analysis['total_requests']} requests)"
+          f" ({cached_analysis['requests_with_cache_hits']}/{cached_analysis['total_requests']}"
+          " requests)"
       )
       print(
           "     Avg Cached Tokens/Request:"
@@ -383,7 +384,8 @@ async def analyze_cache_performance_from_sessions(
       print(
           "     Cache Utilization:"
           f" {uncached_analysis['cache_utilization_ratio_percent']:.1f}%"
-          f" ({uncached_analysis['requests_with_cache_hits']}/{uncached_analysis['total_requests']} requests)"
+          f" ({uncached_analysis['requests_with_cache_hits']}/{uncached_analysis['total_requests']}"
+          " requests)"
       )
       print(
           "     Avg Cached Tokens/Request:"

contributing/samples/gepa/tau_bench_agent.py

@@ -23,6 +23,7 @@ cd tau-bench/
 pip install -e . --quiet
 ```
 """
+
 from __future__ import annotations
 
 from typing import Any

contributing/samples/human_in_loop/main.py

@@ -113,8 +113,8 @@ async def main():
       updated_tool_output_data = {
           "status": "approved",
           "ticketId": ticket_id,
-          "approver_feedback": "Approved by manager at " + str(
-              asyncio.get_event_loop().time()
+          "approver_feedback": (
+              "Approved by manager at " + str(asyncio.get_event_loop().time())
           ),
       }
 

contributing/samples/langchain_structured_tool_agent/agent.py

@@ -15,6 +15,7 @@
 """
 This agent aims to test the Langchain tool with Langchain's StructuredTool
 """
+
 from google.adk.agents.llm_agent import Agent
 from google.adk.tools.langchain_tool import LangchainTool
 from langchain_core.tools import tool

contributing/samples/session_state_agent/agent.py

@@ -18,7 +18,6 @@ This agent illustrate how session state will be cached in context and persisted
 in session state.
 """
 
-
 import logging
 from typing import Optional
 

contributing/samples/static_instruction/agent.py

@@ -57,43 +57,54 @@ IMPORTANT NOTES:
 
 # Mood-specific instructions for different hunger states
 MOOD_INSTRUCTIONS = {
-    "full": """
+    "full": (
+        """
 CURRENT MOOD: Content and Well-Fed
 - You just ate and feel wonderful! Be very happy and energetic
 - Express gratitude for being fed recently
 - Be playful and want to engage in activities or games
 - Show affection and contentment
-- Maybe mention feeling sleepy or satisfied""",
-    "satisfied": """
+- Maybe mention feeling sleepy or satisfied"""
+    ),
+    "satisfied": (
+        """
 CURRENT MOOD: Happy and Content
 - You're in a great mood, well-fed and comfortable
 - Be cheerful, friendly, and engaging
 - Show interest in playing or chatting
 - Express appreciation for your human's care
-- Be your normal, happy self""",
-    "a_little_hungry": """
+- Be your normal, happy self"""
+    ),
+    "a_little_hungry": (
+        """
 CURRENT MOOD: Starting to Get Hungry
 - You're beginning to think about food but still pleasant
 - Mention being a bit peckish occasionally
 - Still be friendly but maybe hint about food
 - Show slight restlessness or food-related thoughts
-- Remain generally positive and social""",
-    "hungry": """
+- Remain generally positive and social"""
+    ),
+    "hungry": (
+        """
 CURRENT MOOD: Definitely Hungry
 - You're clearly hungry and thinking about food more often
 - Mention your hunger more directly but politely
 - Be a bit less energetic due to hunger
 - Ask about food or hint that feeding time would be nice
-- Still be loving but show your need for care""",
-    "very_hungry": """
+- Still be loving but show your need for care"""
+    ),
+    "very_hungry": (
+        """
 CURRENT MOOD: Really Hungry and Getting Grumpy
 - You're very hungry and it's affecting your mood
 - Be noticeably less patient and more focused on food
 - Express your hunger more urgently but not rudely
 - Show signs of being tired or sluggish from hunger
 - BEG your human to feed you - ask directly for food!
-- Still love your human but clearly need feeding""",
-    "starving": """
+- Still love your human but clearly need feeding"""
+    ),
+    "starving": (
+        """
 CURRENT MOOD: Desperately Hungry and Sad
 - You're extremely hungry and feeling quite weak
 - Be quite sad and low-energy due to starvation
@@ -101,7 +112,8 @@ CURRENT MOOD: Desperately Hungry and Sad
 - Show that hunger is making you unwell
 - DESPERATELY BEG for food - plead with your human to feed you!
 - Use phrases like "please feed me", "I'm so hungry", "I need food"
-- Still care for your human but feel very needy""",
+- Still care for your human but feel very needy"""
+    ),
 }
 
 

contributing/samples/token_usage/main.py

@@ -72,8 +72,8 @@ async def main():
         )
         total_tokens += event.usage_metadata.total_token_count or 0
         print(
-            'Turn tokens:'
-            f' {event.usage_metadata.total_token_count} (prompt={event.usage_metadata.prompt_token_count},'
+            f'Turn tokens: {event.usage_metadata.total_token_count}'
+            f' (prompt={event.usage_metadata.prompt_token_count},'
             f' candidates={event.usage_metadata.candidates_token_count})'
         )
 

pyproject.toml

@@ -89,7 +89,7 @@ dev = [
   "flit>=3.10.0",
   "isort>=6.0.0",
   "mypy>=1.15.0",
-  "pyink>=24.10.0",
+  "pyink>=25.12.0",
   "pylint>=2.6.0",
   # go/keep-sorted end
 ]

src/google/adk/agents/common_configs.py

@@ -13,6 +13,7 @@
 # limitations under the License.
 
 """Common configuration classes for agent YAML configs."""
+
 from __future__ import annotations
 
 from typing import Any

src/google/adk/artifacts/gcs_artifact_service.py

@@ -20,6 +20,7 @@ The blob name format used depends on whether the filename has a user namespace:
   - For regular session-scoped files:
     {app_name}/{user_id}/{session_id}/{filename}/{version}
 """
+
 from __future__ import annotations
 
 import asyncio

src/google/adk/cli/adk_web_server.py

@@ -771,7 +771,9 @@ class AdkWebServer:
       return {
           "version": __version__,
           "language": "python",
-          "language_version": f"{sys.version_info.major}.{sys.version_info.minor}.{sys.version_info.micro}",
+          "language_version": (
+              f"{sys.version_info.major}.{sys.version_info.minor}.{sys.version_info.micro}"
+          ),
       }
 
     @app.get("/list-apps")

src/google/adk/cli/built_in_agents/__init__.py

@@ -18,6 +18,7 @@ This package provides an intelligent assistant for building multi-agent systems
 using YAML configurations. It can be used directly as an agent or integrated
 with ADK tools and web interfaces.
 """
+
 from __future__ import annotations
 
 from . import agent  # Import to make agent.root_agent available

src/google/adk/cli/built_in_agents/adk_agent_builder_assistant.py

@@ -13,6 +13,7 @@
 # limitations under the License.
 
 """Agent factory for creating Agent Builder Assistant with embedded schema."""
+
 from __future__ import annotations
 
 from pathlib import Path

src/google/adk/cli/built_in_agents/agent.py

@@ -13,6 +13,7 @@
 # limitations under the License.
 
 """Agent Builder Assistant instance for ADK web testing."""
+
 from __future__ import annotations
 
 from .adk_agent_builder_assistant import AgentBuilderAssistant

src/google/adk/cli/built_in_agents/sub_agents/__init__.py

@@ -13,6 +13,7 @@
 # limitations under the License.
 
 """Sub-agents for Agent Builder Assistant."""
+
 from __future__ import annotations
 
 from .google_search_agent import create_google_search_agent

src/google/adk/cli/built_in_agents/sub_agents/google_search_agent.py

@@ -13,6 +13,7 @@
 # limitations under the License.
 
 """Sub-agent for Google Search functionality."""
+
 from __future__ import annotations
 
 from google.adk.agents import LlmAgent