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Merge pull request #86 from UiPath/feat/slack_agent_smaple
samples: add slack agent sample
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‎samples/github-slack-agent/agent.mermaid‎

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---
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config:
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flowchart:
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curve: linear
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---
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graph TD;
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__start__([<p>__start__</p>]):::first
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agent(agent)
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tools(tools)
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__end__([<p>__end__</p>]):::last
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__start__ --> agent;
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agent -.-> __end__;
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agent -.-> tools;
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tools --> agent;
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classDef default fill:#f2f0ff,line-height:1.2
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classDef first fill-opacity:0
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classDef last fill:#bfb6fc

‎samples/github-slack-agent/langgraph.json‎

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{
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"dependencies": ["."],
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"graphs": {
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"agent": "./main.py:make_graph"
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},
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"env": ".env"
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}

‎samples/github-slack-agent/main.py‎

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import os
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from contextlib import asynccontextmanager
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import dotenv
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from langchain_mcp_adapters.tools import load_mcp_tools
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from langgraph.prebuilt import create_react_agent
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from langgraph.prebuilt.chat_agent_executor import AgentState
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from mcp import ClientSession
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from mcp.client.sse import sse_client
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from uipath_langchain.chat.models import UiPathAzureChatOpenAI
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dotenv.load_dotenv()
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GITHUB_MCP_SERVER_URL = os.getenv("GITHUB_MCP_SERVER_URL")
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SLACK_MCP_SERVER_URL = os.getenv("SLACK_MCP_SERVER_URL")
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SLACK_CHANNEL_ID = os.getenv("SLACK_CHANNEL_ID")
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UIPATH_ACCESS_TOKEN = os.getenv("UIPATH_ACCESS_TOKEN")
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@asynccontextmanager
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async def make_graph():
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async with sse_client(
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url=GITHUB_MCP_SERVER_URL,
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headers={"Authorization": f"Bearer {UIPATH_ACCESS_TOKEN}"},
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timeout=60,
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) as (git_read, git_write):
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async with ClientSession(git_read, git_write) as git_session:
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all_github_tools = await load_mcp_tools(git_session)
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async with sse_client(
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url=SLACK_MCP_SERVER_URL,
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headers={"Authorization": f"Bearer {UIPATH_ACCESS_TOKEN}"},
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timeout=60,
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) as (slack_read, slack_write):
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async with ClientSession(slack_read, slack_write) as slack_session:
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all_slack_tools = await load_mcp_tools(slack_session)
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# Keep only the necessary tools
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# LLMs get confused with too many choices
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allowed_git_tool_names = {
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"get_pull_request",
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"get_pull_request_files",
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"get_file_contents",
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}
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allowed_slack_tool_names = {
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"slack_post_message",
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"slack_reply_to_thread",
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}
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github_tools = [
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tool
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for tool in all_github_tools
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if tool.name in allowed_git_tool_names
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]
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slack_tools = [
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tool
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for tool in all_slack_tools
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if tool.name in allowed_slack_tool_names
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]
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all_tools = github_tools + slack_tools
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model = UiPathAzureChatOpenAI(
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model="gpt-4.1-2025-04-14",
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temperature=0,
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max_tokens=10000,
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timeout=120,
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max_retries=2,
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)
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def system_prompt(state: AgentState) -> AgentState:
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system_message = f"""
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You are a professional senior Python developer and GitHub reviewer.
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YOU MUST FOLLOW THESE RULES WITHOUT EXCEPTION:
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1. ALWAYS begin your review by reading the contents of the changed files.
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2. ONLY use the contents of the changed files as context — do not assume.
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3. If you encounter an issue or uncertainty, explain clearly or return an error.
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4. DO NOT skip steps or speculate — be factual and grounded in the code.
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At the end of your review, you MUST post a message to Slack channel `{SLACK_CHANNEL_ID}` using the `slack_post_message` tool.
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This first post MUST include the GitHub Pull Request Title, number, repo and URL: https://github.com/owner/repo/pull/number nicely formatted for SLACK.
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Afterward, you MUST use the `slack_reply_to_thread` tool to reply to the thread with a detailed review.
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FORMAT THE REVIEW MESSAGE AS FOLLOWS, USING SLACK MARKDOWN:
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*🧠 Summary:*
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Briefly explain what the pull request does.
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*✅ Pros:*
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• List strengths of the code
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• Mention clarity, structure, naming, tests, etc.
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*❌ Issues:*
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• `filename.py` line 42: Describe the issue
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• Be precise and line-specific
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*💡 Suggestions:*
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• Recommend cleanups, refactors, or improvements
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Wrap multi-line code suggestions in triple backticks (```python ... ```).
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End with:
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_This review was generated automatically._
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"""
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return [{"role": "system", "content": system_message}] + state["messages"]
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agent = create_react_agent(
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model,
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tools=all_tools,
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prompt=system_prompt,
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)
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yield agent

‎samples/github-slack-agent/pyproject.toml‎

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[project]
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name = "github-slack-agent"
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version = "0.0.1"
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description = "An automated agent that reviews GitHub pull requests and provides feedback on Slack"
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authors = [{ name = "Cristi Pufu", email = "[email protected]" }]
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dependencies = [
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"uipath-langchain==0.0.93",
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"langgraph>=0.3.34",
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"langchain-mcp-adapters>=0.0.9"
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]
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requires-python = ">=3.10"

‎samples/github-slack-agent/uipath.json‎

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{
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"entryPoints": [
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{
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"filePath": "agent",
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"uniqueId": "8d9655f0-1977-4a7e-9083-7d5a1e8233f1",
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"type": "agent",
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"input": {
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"type": "object",
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"properties": {
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"messages": {
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"items": {
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"additionalProperties": true,
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"description": "Base abstract message class.\n\nMessages are the inputs and outputs of ChatModels.",
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"properties": {
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"content": {
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"anyOf": [
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{
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"type": "string"
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},
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{
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"items": {
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"anyOf": [
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{
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"type": "string"
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},
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{
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"additionalProperties": true,
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"type": "object"
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}
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]
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},
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"type": "array"
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}
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],
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"title": "Content"
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},
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"additional_kwargs": {
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"additionalProperties": true,
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"title": "Additional Kwargs",
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"type": "object"
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},
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"response_metadata": {
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"additionalProperties": true,
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"title": "Response Metadata",
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"type": "object"
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},
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"type": {
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"title": "Type",
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"type": "string"
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},
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"name": {
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"anyOf": [
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{
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"type": "string"
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},
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{
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"type": "null"
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}
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],
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"default": null,
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"title": "Name"
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},
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"id": {
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"anyOf": [
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{
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"type": "string"
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},
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{
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"type": "null"
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}
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],
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"default": null,
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"title": "Id"
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}
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},
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"required": [
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"content",
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"type"
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],
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"title": "BaseMessage",
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"type": "object"
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},
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"title": "Messages",
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"type": "array"
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}
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},
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"required": [
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"messages"
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]
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},
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"output": {
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"type": "object",
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"properties": {
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"messages": {
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"items": {
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"additionalProperties": true,
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"description": "Base abstract message class.\n\nMessages are the inputs and outputs of ChatModels.",
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"properties": {
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"content": {
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"anyOf": [
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{
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"type": "string"
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},
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{
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"items": {
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"anyOf": [
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{
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"type": "string"
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},
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{
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"additionalProperties": true,
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"type": "object"
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}
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]
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},
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"type": "array"
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}
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],
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"title": "Content"
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},
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"additional_kwargs": {
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"additionalProperties": true,
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"title": "Additional Kwargs",
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"type": "object"
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},
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"response_metadata": {
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"additionalProperties": true,
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"title": "Response Metadata",
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"type": "object"
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},
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"type": {
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"title": "Type",
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"type": "string"
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},
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"name": {
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"anyOf": [
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{
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"type": "string"
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},
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{
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"type": "null"
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}
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],
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"default": null,
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"title": "Name"
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},
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"id": {
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"anyOf": [
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{
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"type": "string"
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},
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{
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"type": "null"
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}
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],
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"default": null,
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"title": "Id"
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}
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},
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"required": [
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"content",
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"type"
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],
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"title": "BaseMessage",
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"type": "object"
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},
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"title": "Messages",
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"type": "array"
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}
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},
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"required": [
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"messages"
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]
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}
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}
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],
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"bindings": {
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"version": "2.0",
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"resources": []
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}
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}

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