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May 3, 2025
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samples: add slack agent sample #86

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17 changes: 17 additions & 0 deletions samples/github-slack-agent/agent.mermaid
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---
config:
flowchart:
curve: linear
---
graph TD;
__start__([<p>__start__</p>]):::first
agent(agent)
tools(tools)
__end__([<p>__end__</p>]):::last
__start__ --> agent;
agent -.-> __end__;
agent -.-> tools;
tools --> agent;
classDef default fill:#f2f0ff,line-height:1.2
classDef first fill-opacity:0
classDef last fill:#bfb6fc
7 changes: 7 additions & 0 deletions samples/github-slack-agent/langgraph.json
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{
"dependencies": ["."],
"graphs": {
"agent": "./main.py:make_graph"
},
"env": ".env"
}
119 changes: 119 additions & 0 deletions samples/github-slack-agent/main.py
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import os
from contextlib import asynccontextmanager

import dotenv
from langchain_mcp_adapters.tools import load_mcp_tools
from langgraph.prebuilt import create_react_agent
from langgraph.prebuilt.chat_agent_executor import AgentState
from mcp import ClientSession
from mcp.client.sse import sse_client
from uipath_langchain.chat.models import UiPathAzureChatOpenAI

dotenv.load_dotenv()


GITHUB_MCP_SERVER_URL = os.getenv("GITHUB_MCP_SERVER_URL")
SLACK_MCP_SERVER_URL = os.getenv("SLACK_MCP_SERVER_URL")
SLACK_CHANNEL_ID = os.getenv("SLACK_CHANNEL_ID")
UIPATH_ACCESS_TOKEN = os.getenv("UIPATH_ACCESS_TOKEN")


@asynccontextmanager
async def make_graph():
async with sse_client(
url=GITHUB_MCP_SERVER_URL,
headers={"Authorization": f"Bearer {UIPATH_ACCESS_TOKEN}"},
timeout=60,
) as (git_read, git_write):
async with ClientSession(git_read, git_write) as git_session:
all_github_tools = await load_mcp_tools(git_session)

async with sse_client(
url=SLACK_MCP_SERVER_URL,
headers={"Authorization": f"Bearer {UIPATH_ACCESS_TOKEN}"},
timeout=60,
) as (slack_read, slack_write):
async with ClientSession(slack_read, slack_write) as slack_session:
all_slack_tools = await load_mcp_tools(slack_session)

# Keep only the necessary tools
# LLMs get confused with too many choices
allowed_git_tool_names = {
"get_pull_request",
"get_pull_request_files",
"get_file_contents",
}

allowed_slack_tool_names = {
"slack_post_message",
"slack_reply_to_thread",
}

github_tools = [
tool
for tool in all_github_tools
if tool.name in allowed_git_tool_names
]
slack_tools = [
tool
for tool in all_slack_tools
if tool.name in allowed_slack_tool_names
]

all_tools = github_tools + slack_tools

model = UiPathAzureChatOpenAI(
model="gpt-4.1-2025-04-14",
temperature=0,
max_tokens=10000,
timeout=120,
max_retries=2,
)

def system_prompt(state: AgentState) -> AgentState:
system_message = f"""
You are a professional senior Python developer and GitHub reviewer.

YOU MUST FOLLOW THESE RULES WITHOUT EXCEPTION:

1. ALWAYS begin your review by reading the contents of the changed files.
2. ONLY use the contents of the changed files as context — do not assume.
3. If you encounter an issue or uncertainty, explain clearly or return an error.
4. DO NOT skip steps or speculate — be factual and grounded in the code.

At the end of your review, you MUST post a message to Slack channel `{SLACK_CHANNEL_ID}` using the `slack_post_message` tool.
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.

Afterward, you MUST use the `slack_reply_to_thread` tool to reply to the thread with a detailed review.

FORMAT THE REVIEW MESSAGE AS FOLLOWS, USING SLACK MARKDOWN:

*🧠 Summary:*
Briefly explain what the pull request does.

*✅ Pros:*
• List strengths of the code
• Mention clarity, structure, naming, tests, etc.

*❌ Issues:*
• `filename.py` line 42: Describe the issue
• Be precise and line-specific

*💡 Suggestions:*
• Recommend cleanups, refactors, or improvements

Wrap multi-line code suggestions in triple backticks (```python ... ```).
End with:

_This review was generated automatically._
"""

return [{"role": "system", "content": system_message}] + state["messages"]

agent = create_react_agent(
model,
tools=all_tools,
prompt=system_prompt,
)

yield agent
11 changes: 11 additions & 0 deletions samples/github-slack-agent/pyproject.toml
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[project]
name = "github-slack-agent"
version = "0.0.1"
description = "An automated agent that reviews GitHub pull requests and provides feedback on Slack"
authors = [{ name = "Cristi Pufu", email = "[email protected]" }]
dependencies = [
"uipath-langchain==0.0.93",
"langgraph>=0.3.34",
"langchain-mcp-adapters>=0.0.9"
]
requires-python = ">=3.10"
181 changes: 181 additions & 0 deletions samples/github-slack-agent/uipath.json
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{
"entryPoints": [
{
"filePath": "agent",
"uniqueId": "8d9655f0-1977-4a7e-9083-7d5a1e8233f1",
"type": "agent",
"input": {
"type": "object",
"properties": {
"messages": {
"items": {
"additionalProperties": true,
"description": "Base abstract message class.\n\nMessages are the inputs and outputs of ChatModels.",
"properties": {
"content": {
"anyOf": [
{
"type": "string"
},
{
"items": {
"anyOf": [
{
"type": "string"
},
{
"additionalProperties": true,
"type": "object"
}
]
},
"type": "array"
}
],
"title": "Content"
},
"additional_kwargs": {
"additionalProperties": true,
"title": "Additional Kwargs",
"type": "object"
},
"response_metadata": {
"additionalProperties": true,
"title": "Response Metadata",
"type": "object"
},
"type": {
"title": "Type",
"type": "string"
},
"name": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
],
"default": null,
"title": "Name"
},
"id": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
],
"default": null,
"title": "Id"
}
},
"required": [
"content",
"type"
],
"title": "BaseMessage",
"type": "object"
},
"title": "Messages",
"type": "array"
}
},
"required": [
"messages"
]
},
"output": {
"type": "object",
"properties": {
"messages": {
"items": {
"additionalProperties": true,
"description": "Base abstract message class.\n\nMessages are the inputs and outputs of ChatModels.",
"properties": {
"content": {
"anyOf": [
{
"type": "string"
},
{
"items": {
"anyOf": [
{
"type": "string"
},
{
"additionalProperties": true,
"type": "object"
}
]
},
"type": "array"
}
],
"title": "Content"
},
"additional_kwargs": {
"additionalProperties": true,
"title": "Additional Kwargs",
"type": "object"
},
"response_metadata": {
"additionalProperties": true,
"title": "Response Metadata",
"type": "object"
},
"type": {
"title": "Type",
"type": "string"
},
"name": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
],
"default": null,
"title": "Name"
},
"id": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
],
"default": null,
"title": "Id"
}
},
"required": [
"content",
"type"
],
"title": "BaseMessage",
"type": "object"
},
"title": "Messages",
"type": "array"
}
},
"required": [
"messages"
]
}
}
],
"bindings": {
"version": "2.0",
"resources": []
}
}
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