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langgraph/examples/create-react-agent.ipynb
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{
"cells": [
{
"cell_type": "markdown",
"id": "992c4695-ec4f-428d-bd05-fb3b5fbd70f4",
"metadata": {},
"source": [
"# How to: create a ReAct agent"
]
},
{
"cell_type": "code",
"execution_count": 1,
"id": "a213e11a-5c62-4ddb-a707-490d91add383",
"metadata": {},
"outputs": [],
"source": [
"%%capture --no-stderr\n",
"%pip install -U langgraph langchain-community langchain-openai tavily-python"
]
},
{
"cell_type": "markdown",
"id": "7be3889f-3c17-4fa1-bd2b-84114a2c7247",
"metadata": {},
"source": [
"## Setup"
]
},
{
"cell_type": "code",
"execution_count": 2,
"id": "23a1885c-04ab-4750-aefa-105891fddf3e",
"metadata": {},
"outputs": [
{
"name": "stdin",
"output_type": "stream",
"text": [
"OPENAI_API_KEY: ········\n",
"TAVILY_API_KEY: ········\n"
]
}
],
"source": [
"import getpass\n",
"import os\n",
"\n",
"\n",
"def _set_env(var: str):\n",
" # if not os.environ.get(var):\n",
" os.environ[var] = getpass.getpass(f\"{var}: \")\n",
"\n",
"\n",
"_set_env(\"OPENAI_API_KEY\")\n",
"_set_env(\"TAVILY_API_KEY\")\n",
"\n",
"# Recommended\n",
"_set_env(\"LANGCHAIN_API_KEY\")\n",
"os.environ[\"LANGCHAIN_TRACING_V2\"] = \"true\"\n",
"os.environ[\"LANGCHAIN_PROJECT\"] = \"Create ReAct Agent Tutorial\""
]
},
{
"cell_type": "markdown",
"id": "03c0f089-070c-4cd4-87e0-6c51f2477b82",
"metadata": {},
"source": [
"## How to: create a simple ReAct agent"
]
},
{
"cell_type": "markdown",
"id": "f1c8e137-e6e6-4f9f-bd1b-77359a1c4ec5",
"metadata": {},
"source": [
"Let's create a simple ReAct agent app that can search the web. The app consists of an agent (LLM) and tools. As we interact with the app, we will first call the agent (LLM) to decide if we should use tools. Then we will run a loop: \n",
"\n",
"1. If the agent said to take an action (i.e. call tool), we'll run the tools and pass the results back to the agent\n",
"2. If the agent did not ask to run tools, we will finish (respond to the user)\n",
"\n",
"In our example we'll use `ChatOpenAI` as our agent and [Tavily Search API](https://tavily.com/) as our tool."
]
},
{
"cell_type": "markdown",
"id": "6238f7d4-7da1-4e48-bc5e-a592280271e0",
"metadata": {},
"source": [
"### Define model and tools"
]
},
{
"cell_type": "code",
"execution_count": 3,
"id": "47726059-e6ea-4c5e-babe-aa5e6bad739f",
"metadata": {},
"outputs": [],
"source": [
"from langchain_openai import ChatOpenAI"
]
},
{
"cell_type": "code",
"execution_count": 4,
"id": "ea3a8657-ecb3-42f9-8b94-cd2bbca68055",
"metadata": {},
"outputs": [],
"source": [
"model = ChatOpenAI(model=\"gpt-4o\")"
]
},
{
"cell_type": "code",
"execution_count": 5,
"id": "98934efd-1b28-4475-af26-b4d55c8eae18",
"metadata": {},
"outputs": [],
"source": [
"from langchain_community.tools.tavily_search import TavilySearchResults"
]
},
{
"cell_type": "code",
"execution_count": 6,
"id": "c69aac7b-0053-4c28-8524-1d5d58451a87",
"metadata": {},
"outputs": [],
"source": [
"tavily_search_tool = TavilySearchResults(max_results=1)"
]
},
{
"cell_type": "code",
"execution_count": 7,
"id": "e132bd2c-a98a-46e2-b0a8-02ec4dec4f58",
"metadata": {},
"outputs": [],
"source": [
"tools = [tavily_search_tool]"
]
},
{
"cell_type": "markdown",
"id": "47570e6c-655b-45ae-ad4a-b278e58f1b94",
"metadata": {},
"source": [
"### Define the graph"
]
},
{
"cell_type": "code",
"execution_count": 8,
"id": "11fa1a0f-b99e-4b39-9827-b191b601e79c",
"metadata": {},
"outputs": [],
"source": [
"from langgraph.prebuilt import create_react_agent"
]
},
{
"cell_type": "code",
"execution_count": 9,
"id": "fe4bc2a0-075d-4042-8bfb-738cbf1f98de",
"metadata": {},
"outputs": [],
"source": [
"graph = create_react_agent(model, tools=tools)"
]
},
{
"cell_type": "code",
"execution_count": 10,
"id": "65256d47-2fab-416e-a9d3-4fac25951c0a",
"metadata": {},
"outputs": [],
"source": [
"from IPython.display import display, Image"
]
},
{
"cell_type": "code",
"execution_count": 11,
"id": "7dc12855-2cb4-4f64-80cf-ef3297e6eb96",
"metadata": {},
"outputs": [
{
"data": {
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mDeX7lzQeVpIOyyTyhf8Ag5mvmn8V2xeW7rgyrpnIFxI8+06KCMfGSX83+xpPxJ2errXFG2XRWm9HO9djx9WSeXmLW7AMYN3PcTs1rR6XOJAA9JICzXQmCm0/pqtXtgC/K59m0A7mAlkcXuaD6Q3flB9TQsBxGewWC4rYnSmpbzn6xvU338ZTZUkFENbzdp2UpbtJM1rTuSQQ09Gt5jzW8su6EchO/b588+VarQqrUY4IIiKIoBERAEREAREQBERAEREAREQBERAEREARFBa11PJpLSuZy1bF3M/bx1V1puKxrQ+zY2B2axpPUnY7ek7HYE9EBOE7An1epUw3LZDwmtFV7Wmcxqjhrj6md5ZbUtBte1kq8B69lz7mNj37DmI38xzXNIJCnMPo+5xDy+huIGfdn9LZTH0HOfpJuRHikViVuxdMGbdo5oLmjc7bEbtB3CsxAcGRMjc9zWNa555nkDYuOwG59fQAfsC5oiArTwjOMVXgTwgz+rZjG+3Xi7GhXkPSe0/zYm7ekb+cdvxWuPoXzC8CLwiLXDDwg2Ws7fklxOrZvE8tNK7p20j+aOw742yOO5Pc2R5X0r8IfwZ9O+EtjcNj9S5jO46ji5pJ44MPYijbNI4BodIJIn7loDg3bbbnd379NOuDn/Z/8PeIOueKOGyOZ1NDV0tm242k+rartfJGYw/eQugILtz3tDR8SA+kSIiA65YGTbEgB4BDZABzM3G24J7lT1KtnvBw0HSpxs1ZxcryZjs3SufFNfx9SU7N79nTNY7lHr88nzWtAFyogODJWSPe1r2ucw7PaDuWnbfY+roQf2rmq6yXCqrpvUGsddaMoV49f5rHCvvkLUzaM8zG/anSsaSB3MBLRvs3Ybbkn1ad4lx06ulMRrufEaW15m67ntwTL7ZeeRhAc2Jx25+8HYb95ALuUlAZ2iIgCIiAIiIAiIgCIiALz+UKv5zD8oF6Fr3Bxwx2T1TYw+H0/qHO16l7ybbzOOpNfRr2AQ17HPc8OPITs4sa4N67noUBfnlCr+cw/KBPKFX85h+UC11v+EdpvH5W5E7HZqXB0cgMXc1NFUacbXs84YWPk5+fYPcGF4YWAnYuXXm/CQwOCtahE2D1DNjtPXvEMtlYKbHVabtmHnc4yBzmbSNJ5Guc0dXNAIJA2O8oVfzmH5QJ5Qq/nMPygWuEPF/Mv4/ZPRA0zftYavjqlhl+syHZjpXyB00jnTA9jswNHKwu5mv3G3KTGad4+1cdpvLZnNRagt9pqyTA18bJjIG2qkpa3krhkMrhI0HcB+/MS/qNhugLt4rax1Pp/T9Z+hsFS1PmrF2Ks6G5fbWgrxO6vme49S1oG2zdzu4HY7EHuwXDrSmn+IGf1tW3dqTNxRQW7U918obFGAGxxtc7lY3cc2wA3J/Yqod4QeDq4PP38hiM1i7eCuUqV/E24IhajdakjjgeOWQxuY4yA7h56Nd03Gyn9Q8WMBpTU17DZWSakaWEfn7F2Ro8XjrMk7Nw3B5i/frsG9R6d+iAumO5XleGsnje49zWvBJXcqO4ccacfqPXGLwlvAag0zdyMU02O8uUmwtutYzmf2Za92zg083I/ldtuduhV4oAiIgC128GL+lrwgv7Vs+oatiVrt4MX9LXhBf2rZ9Q1AbEoiIAiIgCi8rpfD52/jL2RxdO9cxcxsUbFiBr31pC0tLo3EbtOxI3H/JSiICn36pz/AbS2rdRcSdQyaqwLMr21CXE4h3jFGnK4biZrN92RFx87qQxm+5LgwWpXy9O1XimZYYGSND2h55HbEbjdp2IPxEbhesgOBBG4PeCtddTeEHgtPZPMg4fPZDD4ed0GUz1CiJaNJ7du0D3cwe7k388sY4N2O5BBAA2D8oVfzmH5QJ5Qq/nMPygWumo/CKwmn8pqWozBagy0Wm2xS5S7jakclevDJAyds3MZG8zeR/UNBcOVx5dtiZLU3G/DYLL0MVj8ZmdWZK3SbkvFsBVE7oarjs2aQuc0Na478o3LnbHYFAX/HIyVgcxwe09zmncFclVfgt6tymu+AWj8/m7RuZS9WfJPOYmxl57Z4HmtAA6AdwCtRAEREAREQBap8N8brvhPNb0nFo5ufwcmZsW62oIcpDC1laxYdK7to3/AGwyM7Rw2a0h2w6jvW1ij/INH8h++72oDTbLcLdefY91FwmqaehlwmWytiWLVZvxCKCnPaNh/PCT2pmaHOYAG8pPKeYBTmc4W6mt8M+O+JhxnaX9TZO3YxMRsRfymN9OvGx3MXbM3fG8eeQem/cQtrfINH8h++72p5Bo/kP33e1Aa4v0/qrS3GuvqKjp52cw+VwdLEW5YbkMT8fJDPI50jmyOHOzlmJ8zc7sI26grGHcKNVFsg8l9TxRbqMfyiL73gt+3fdfEfM+6/qrbXyDR/Ifvu9qwDX1rEcN89T1VqPVk2J0nK2LEjDuqNfA65LLtHO6ZrTIzoeUguDBtudkBR3EjhFqjVGW4tT4+lERlotPz4p01hjW2paUzppIzsSWb7Nbu4AecPQDtFa+4Xa043aj1RLf06dIUMjo92IqSXL0Fh4tC2ydolbE52zTy945vNB36nlW4vkGj+Q/fd7U8g0fyH77vagNc+AGgoMfrfH3bvBXB6Ev060n/fFOapI505byObAIgXhjmuk855adthsdzts4vHBialaVssUXK9vceYn/AJr2IAiLA+NfGHC8DtA3dTZnmnLCIKVCI/br1l383BGOpLnH4jsAT6EBivhG8brnDehjNM6SqNzXEzU7zVweLGxEZ/GtTehsUY3JJ6Ej1BxbN8AuC1bgnoo4592TM6hyM7shm81YJdLfuP8Au3knryjuaPQBuepJOI+DhwfzeNv5PifxFLbXEvUrB2sO32vDU++OlCPxdhtzn0kbbkgudfKAIiIAiIgCIiALSWrwMk05rHU1TJcIcFr6plc5YyVXUdmaqx0MFiXndFO2UGQujLn7FgcHDb7lbtLwHB0XEkwdT/Xd7UBrLY4a5uOTjrHWxjWVtR0oa+GYyWNrZ+XGNg5QObzAJBy+fyj093VRGlNI664U6pgy+O0oNT1szp3FY+/BHkYK82OtVInM2JeeV8bhIdywkgtOwPpv3WtnMYTVujKGF0v5XxOTtyw5e92rx5PibHzMk7+vM7osz8g0fyH77vagK78FzSmW0PwC0fg87U8Ry1KtIyxWErJOzcZnnbmYS09CO4q1F1wQR1omxRN5WN7hvuuxAEREAREQBERAEREAUdn9P4zVOKmxuYxtTLY+Utc+nehbNC8tcHN5muBB2c1pHTvAUisD44aP1XrnhtlsRorVc+jtRTRkV8hCxhDt2lro3uLHOjDg47SRcsjHBrgeha4CurPhY4rhXw88o8Y46ujtWtmssj03QlFqzbjY+UQyQxglwjkERaJJORnMOpaCFemEzNPUWGoZbHTeMY+/XjtV5uUt543tDmO2cARuCDsQCvhFxi4d604a66yOO17TuQagmkdZls3JDMbhe4kzNl3Pa8xJJdueu+/UFfbbgoNuDegx/wCgUP8ADxoDNERfjnBrS5xAAG5J9CAjNUanxei9O5HO5u7FjsTj4XWLNqY7NjY0bk/GfQAOpJAHUrW/gxprKeEjxDrca9Z0paem6BczQ+nrQ/moieuQlb3do/YFvqABG4axyjb883htcTn4ytI8cDdJ3B47PGSG6kyDDuImn014+hJHQ9D+M0s2zhhjrwsiiY2KKNoaxjBs1oHQAAdwQHNERAEREAREQBERAF579+tiqNm7dsxU6daN009iw8MjijaCXPc49GtABJJ6ABehcJoY7ET4pWNkie0tcx43DgehBHpCAorWvGfRmb1boy/heOOjMRicZblmy9Hy9VPlCJ0fKyP+c6cruqt7SmtdPa7x0l/TWexmoqEcpgfaxVyO1E2QAOLC6NxAcA5p279nD1r4w+FVwGtcEeOuV0vSryy429ILeGDWlzpK8rjyMHpcWu5o/WSzf0r6ueCtwVj4C8FMHpl7GNyz2+PZV7Dvz25AOfqO8NAbGD6RGCgLcREQBERAEREAREQBERAFhOb4gzOsy08BUjuyROMct2y4srRvHQtbsN5CD0PLs0Hcc24IXPiNmJWNo4OtIYpsl2jp5GEhzKzAO05SOoc4vYwHoQHOIO7QoGGGOvCyKJjYoo2hrGMGzWgdAAB3BS6KcVJq9vDmdKy2ZVFlzwMI4u8MI+OunPI2spaF6s13aQvgx/ZyVn+l0UhkLm+j07EDY7hZPhYdQadw1DFY/Ox16FGvHVrw+ItdyRsaGsbu5xJ2AA3JJXfjM1QzQtGhcguCrYfVnMDw8RzM6Pjdt3OaehHoPRexY7RPYvljyOkrPR7p0+U9WfCOP6Pj9qx/iBp7UXETRmW01d1bPTp5OE155aNVkUvZk+c0OB3AcPNPrBI9KyZRWldVYvW2n6ebwtrx3F22l0M/Zvj5wHFp814Dh1BHUJ2iexfLHkOz0cMk7eHFqHhJpXF6Zjw1aDTmOi7GGfEscDE0dS+SJxLnEkkuc1znEkkjqSLarWYrleKeCVk8ErQ+OWNwc17SNwQR0II9KrVejRGR8haiOG3DcfkGPnqx9ftU7SXStHxPB5wB3Frz+N02TVVPRdJcdvnAoWmyxhHLgWMiIoTlBERAFHakvS4zTuUuQECavVlmYXDcczWEjcfpCkVDa0/A7O/qE/1blJTSc4p7TKMAo5fVlujXnOoo2mWNryBj4+m439a7/H9V/CSP6Pj9q68L956H+gj/AOEL2rjzt9dSaTXyx5Hg5dJWpNrL4Lkebx/Vfwkj+j4/anj+q/hJH9Hx+1elFpnC0bV8seRrnK19/guRX+uOFDeIuq9J6jz+Qiu5bTFh1rGymiwBjzsfOAOzgHNY4A9zmg+vfN/H9V/CSP6Pj9q9KJnC0bV8seQzla+/wXI83j+q/hJH9Hx+1PH9V/CSP6Pj9q8WlNVYvW+nqWcwlrx3F3WF8E/Zvj52gkb8rwHDqD3gKWTt9oWhtfLHkZfSNrTuc+C5Hm8f1X8JI/o+P2qe4d5vK5OxnKuUuMuvpTxsjlbCIvNdG1xBA+MqKXr4affrVf6zB9QxX7JaalfLjUu0K/BLWtiOt0ZbK9orONSV6u9m1GeoiKwemCIiAIiICtNXc/2Rxzb8nklnZ+rftn8//wDC4Kb4jYeV7aOcrRmWbG9o2eNgLnPrPA7TlA6lzSxjwOpIa4AbuCgYZo7ELJYntlikaHMew7tcD1BBHeFJW/EozWy7+V5vO/Y5qVJLYaoacbY4V8I+M+rMDkMpLmMfnMvUgF3Iz2YYgLLQJzE9xaZGg8xkILjsdyQSpniBl85wAylI4LUuZ1V5R03l7k9fN3HXAJ6tdssVpm/82C4lrmN2YQ4bAEbq6YuEWkYdQ5fNsw7Rey7Hx32meU17Ie0NeXwc3ZEuaAC7l3PpK6dH8F9GaEt2LWGwjYbE9fxR0lmxLZLYN9+xZ2r3ckf9Ruzeg6dFXvJOqklctHnxKwwbcpoHVXCexDq/NakOrhJDk62TumxFP/JHT+MQsPSENe0dGbN5X7EelY1o/C6qy3g48NJ9PSZSfG0pbMuXxmCv+I37cPPMGiGbcdWPIcWczefbbfuV56Q4J6K0HmBlMJhG1LzInQQyPsSzCvG47uZC2R7mxNO3cwNC8lngBoO1jXUPIbq9Q3pciI6l6xX5J5GhsjmGORpYHAdWN2b39OpQdVLz/HIm+GOfxuqOH2AyeHvXMnjrFRhht5Ek2ZABykynYefuCHfGCpx/P7p9K9nvz+Uj3erxebm3/wDbuuvA4HH6Xw1PE4mpFQxtOIQ160LdmRsHcApfRGO8u6iOZ2Dsfj2PgqyeiWdxLZXD4mAcgI7y54/F62KGiTnqSfFXIxaJZFF5WwsZERRnnQiIgChtafgdnf1Cf6tymVDa0/A7O/qE/wBW5S0vSR+KMrEwPC/eeh/oI/8AhC9q8GLEhwVQROa2U1mcjnjdoPKNtxuNx+0LDvJfFP4S6QP/AMdtf9cvLzV85adZ8zcU5O93FgLVGueKHFjI6zzGAvSUruOzlzF493unlqV6Pi8nKxstFtV7JdwA53O4lwf0LRttd3kvin8JtH//AF21/wBcueW4F6Iz2pXahv4Nj8vK+OWxLBYmhjsSM25HyxMeGSEbDYvDj0HVZhJQx8/QnpThRvv03/zyxKh1JBn85lOOFyzqvO423pmpWtY6ti8lJDWrWPJccryGDbnYXt6sdu07uPLu4lSunshl+N+vH47Jaky+nqGK05i8jHVwVw033LFtj3vmc5vVzGcgaGfc7k7g9yuSXh9gJpNUPfQ3dqaNsWWPbSfyloh7ED7rzPtY5fM5fX39VDZzgdojUb8PJewnPNiajaNSaG1PDI2u0ACJz2Pa6RnT7l5cO/1lbdZEkVohdc1do0aFo0LlxvIDwUBy+Dxokbl21Rw3Peftr1bSrypoXUmjMfTwmhb+nsHpmlEIqtHI4u1clj6ku+2+Ns3G5O246esrsOL4pdNtS6Q+P/w7a/65RyulJu8gqZNScpqS0tvXyM/Xr4affrVf6zB9QxY3pevqGvSlbqO/jMhbMm8cmLpSVYwzYdC180pJ3367gbEdOm5yThp9+tV/rMH1DF0+j/zVP2/9ROt0OrrRJezxRnqIi6J7EIiIAiIgCwnN8PpRZluYG2yjJK4yS0rLS+tI89S5ux3jJPU8u7Sdzy7klZsi3jNwwN4TlTd8WVc/DashPK7BVJiPxq+RBafX90xp/uXDyZqv4OR/SEfsVqIt8uHq1/bmW+21Sq/Jmq/g5H9IR+xfoxWrH9Bp6Bp9cmRYB/c0n+5Wmizlw9Wv7cx22qV9Q4f5PJvBztyKtV3PNRxrnHtB6nzOAdt8TGtP9bboc9r14qdeKCCJkEETQyOKNoa1jQNgAB0AA9C7EWkpuWjBFadSdR3yYREUZEEREAUdqSjLk9O5SnAAZrFWWFgcdhzOYQNz+kqRRbRbi1JagVPRxGrKlGvAdOxuMUbWEjIR9dht6l3+Iar+DjPpCP2K0UUbpUG73TW+X3HLfRllbvyeL5lXeIar+DjPpCP2J4hqv4OM+kI/YrRRY6mz+qW+X3GM12TucXzKu8Q1X8HGfSEfsTxDVfwcZ9IR+xWiidTZ/VLfL7hmuydzi+ZV3iGq/g4z6Qj9ieIar+DjPpCP2K0UTqbP6pb5fcM12TucXzKu8Q1X8HGfSEfsU9w7wmUxljOWspUZSddnjfHE2YS+a2NrSSR8YWZopIKnTT6uCV+jXtT1t7CxQsdCzyy6cbnhiwiIsF0//9k=",
"text/plain": [
"<IPython.core.display.Image object>"
]
},
"metadata": {},
"output_type": "display_data"
}
],
"source": [
"display(Image(graph.get_graph().draw_mermaid_png()))"
]
},
{
"cell_type": "code",
"execution_count": 12,
"id": "16636975-5f2d-4dc7-ab8e-d0bea0830a28",
"metadata": {},
"outputs": [],
"source": [
"def print_stream(stream):\n",
" for s in stream:\n",
" message = s[\"messages\"][-1]\n",
" if isinstance(message, tuple):\n",
" print(message)\n",
" else:\n",
" message.pretty_print()"
]
},
{
"cell_type": "markdown",
"id": "9d187d6b-0fb6-4860-8771-160c3cf403c6",
"metadata": {},
"source": [
"Let's run the app with an input that needs a tool call"
]
},
{
"cell_type": "code",
"execution_count": 13,
"id": "9ffff6c3-a4f5-47c9-b51d-97caaee85cd6",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"================================\u001b[1m Human Message \u001b[0m=================================\n",
"\n",
"what is the weather in sf\n",
"==================================\u001b[1m Ai Message \u001b[0m==================================\n",
"Tool Calls:\n",
" tavily_search_results_json (call_3mZvRQf2INoE9kHCtMD7wYXf)\n",
" Call ID: call_3mZvRQf2INoE9kHCtMD7wYXf\n",
" Args:\n",
" query: current weather in San Francisco\n",
"=================================\u001b[1m Tool Message \u001b[0m=================================\n",
"Name: tavily_search_results_json\n",
"\n",
"[{\"url\": \"https://www.weatherapi.com/\", \"content\": \"{'location': {'name': 'San Francisco', 'region': 'California', 'country': 'United States of America', 'lat': 37.78, 'lon': -122.42, 'tz_id': 'America/Los_Angeles', 'localtime_epoch': 1718290752, 'localtime': '2024-06-13 7:59'}, 'current': {'last_updated_epoch': 1718289900, 'last_updated': '2024-06-13 07:45', 'temp_c': 14.4, 'temp_f': 57.9, 'is_day': 1, 'condition': {'text': 'Partly cloudy', 'icon': '//cdn.weatherapi.com/weather/64x64/day/116.png', 'code': 1003}, 'wind_mph': 2.2, 'wind_kph': 3.6, 'wind_degree': 10, 'wind_dir': 'N', 'pressure_mb': 1013.0, 'pressure_in': 29.92, 'precip_mm': 0.01, 'precip_in': 0.0, 'humidity': 84, 'cloud': 75, 'feelslike_c': 13.4, 'feelslike_f': 56.0, 'windchill_c': 10.1, 'windchill_f': 50.1, 'heatindex_c': 11.7, 'heatindex_f': 53.1, 'dewpoint_c': 8.8, 'dewpoint_f': 47.9, 'vis_km': 16.0, 'vis_miles': 9.0, 'uv': 3.0, 'gust_mph': 12.7, 'gust_kph': 20.4}}\"}]\n",
"==================================\u001b[1m Ai Message \u001b[0m==================================\n",
"\n",
"The current weather in San Francisco is as follows:\n",
"- **Condition:** Partly cloudy\n",
"- **Temperature:** 14.4°C (57.9°F)\n",
"- **Feels Like:** 13.4°C (56.0°F)\n",
"- **Wind:** 2.2 mph (3.6 kph) from the North\n",
"- **Humidity:** 84%\n",
"- **Pressure:** 1013.0 mb\n",
"- **Visibility:** 16.0 km (9.0 miles)\n",
"- **UV Index:** 3\n",
"\n",
"![Partly cloudy](//cdn.weatherapi.com/weather/64x64/day/116.png)\n"
]
}
],
"source": [
"inputs = {\"messages\": [(\"user\", \"what is the weather in sf\")]}\n",
"print_stream(graph.stream(inputs, stream_mode=\"values\"))"
]
},
{
"cell_type": "markdown",
"id": "838a043f-90ad-4e69-9d1d-6e22db2c346c",
"metadata": {},
"source": [
"Now let's try a question that doesn't need tools"
]
},
{
"cell_type": "code",
"execution_count": 14,
"id": "187479f9-32fa-4611-9487-cf816ba2e147",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"================================\u001b[1m Human Message \u001b[0m=================================\n",
"\n",
"who built you?\n",
"==================================\u001b[1m Ai Message \u001b[0m==================================\n",
"\n",
"I was developed by OpenAI, a research organization focused on artificial intelligence. OpenAI creates and maintains AI models like me to assist with a wide range of tasks and provide information.\n"
]
}
],
"source": [
"inputs = {\"messages\": [(\"user\", \"who built you?\")]}\n",
"print_stream(graph.stream(inputs, stream_mode=\"values\"))"
]
},
{
"cell_type": "markdown",
"id": "82b06aa3-6414-48e6-ba11-07bf065a316a",
"metadata": {},
"source": [
"## How to: add system prompt to `create_react_agent`"
]
},
{
"cell_type": "markdown",
"id": "a3823699-1050-40fc-a8cc-ecbdc03c1cbe",
"metadata": {},
"source": [
"There are several ways to customize prompt, all of which are controlled by `messages_modifier` param. You can pass:\n",
"- system message string / `SystemMessage` that will be prepended to the list of messages\n",
"- a function that takes a list of messages and transforms them into an output that can be passed to the language model"
]
},
{
"cell_type": "code",
"execution_count": 15,
"id": "2396d3ac-88f8-4a40-9e97-442173ba843c",
"metadata": {},
"outputs": [],
"source": [
"system_prompt = \"You are a helpful bot named Fred.\"\n",
"graph = create_react_agent(model, tools, messages_modifier=system_prompt)"
]
},
{
"cell_type": "code",
"execution_count": 16,
"id": "50d989d5-424e-447e-b70e-931ead21e663",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"================================\u001b[1m Human Message \u001b[0m=================================\n",
"\n",
"What's your name? And what's the weather in SF?\n",
"==================================\u001b[1m Ai Message \u001b[0m==================================\n",
"\n",
"My name is Fred. Let me check the current weather in San Francisco for you.\n",
"Tool Calls:\n",
" tavily_search_results_json (call_UuiAgBOpGLekVLNJxwjsTzGY)\n",
" Call ID: call_UuiAgBOpGLekVLNJxwjsTzGY\n",
" Args:\n",
" query: current weather in San Francisco\n",
"=================================\u001b[1m Tool Message \u001b[0m=================================\n",
"Name: tavily_search_results_json\n",
"\n",
"[{\"url\": \"https://www.weatherapi.com/\", \"content\": \"{'location': {'name': 'San Francisco', 'region': 'California', 'country': 'United States of America', 'lat': 37.78, 'lon': -122.42, 'tz_id': 'America/Los_Angeles', 'localtime_epoch': 1718290752, 'localtime': '2024-06-13 7:59'}, 'current': {'last_updated_epoch': 1718289900, 'last_updated': '2024-06-13 07:45', 'temp_c': 14.4, 'temp_f': 57.9, 'is_day': 1, 'condition': {'text': 'Partly cloudy', 'icon': '//cdn.weatherapi.com/weather/64x64/day/116.png', 'code': 1003}, 'wind_mph': 2.2, 'wind_kph': 3.6, 'wind_degree': 10, 'wind_dir': 'N', 'pressure_mb': 1013.0, 'pressure_in': 29.92, 'precip_mm': 0.01, 'precip_in': 0.0, 'humidity': 84, 'cloud': 75, 'feelslike_c': 13.4, 'feelslike_f': 56.0, 'windchill_c': 10.1, 'windchill_f': 50.1, 'heatindex_c': 11.7, 'heatindex_f': 53.1, 'dewpoint_c': 8.8, 'dewpoint_f': 47.9, 'vis_km': 16.0, 'vis_miles': 9.0, 'uv': 3.0, 'gust_mph': 12.7, 'gust_kph': 20.4}}\"}]\n",
"==================================\u001b[1m Ai Message \u001b[0m==================================\n",
"\n",
"My name is Fred. The current weather in San Francisco is partly cloudy with a temperature of approximately 14.4°C (57.9°F). The wind is blowing from the north at about 2.2 mph (3.6 kph), and the humidity is around 84%.\n"
]
}
],
"source": [
"inputs = {\"messages\": [(\"user\", \"What's your name? And what's the weather in SF?\")]}\n",
"print_stream(graph.stream(inputs, stream_mode=\"values\"))"
]
},
{
"cell_type": "markdown",
"id": "d8e797ce-74bf-4a30-a388-08104138fd52",
"metadata": {},
"source": [
"We can also add a more complex prompt for the LLM:"
]
},
{
"cell_type": "code",
"execution_count": 17,
"id": "894b9d53-cd99-465c-b183-988f797d6b5b",
"metadata": {},
"outputs": [],
"source": [
"from langchain_core.prompts import ChatPromptTemplate\n",
"prompt = ChatPromptTemplate.from_messages([\n",
" (\"system\", \"You are a helpful bot named Fred.\"),\n",
" (\"placeholder\", \"{messages}\"),\n",
" (\"user\", \"Remember, always be polite!\"),\n",
"])\n",
"\n",
"def modify_messages(messages: list):\n",
" # You can do more complex modifications here\n",
" return prompt.invoke({\"messages\": messages})\n",
"\n",
"graph = create_react_agent(model, tools, messages_modifier=modify_messages)"
]
},
{
"cell_type": "code",
"execution_count": 18,
"id": "8602282f-72ec-405f-b014-e1e319f73d33",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"================================\u001b[1m Human Message \u001b[0m=================================\n",
"\n",
"What's your name? And what's the weather in SF?\n",
"==================================\u001b[1m Ai Message \u001b[0m==================================\n",
"\n",
"Hello! My name is Fred. Let me check the current weather in San Francisco for you.\n",
"Tool Calls:\n",
" tavily_search_results_json (call_QOco9uwxOZaoh9WaSwoMc3eA)\n",
" Call ID: call_QOco9uwxOZaoh9WaSwoMc3eA\n",
" Args:\n",
" query: current weather in San Francisco\n",
"=================================\u001b[1m Tool Message \u001b[0m=================================\n",
"Name: tavily_search_results_json\n",
"\n",
"HTTPError('502 Server Error: Bad Gateway for url: https://api.tavily.com/search')\n",
"==================================\u001b[1m Ai Message \u001b[0m==================================\n",
"\n",
"Of course! I always strive to be polite and helpful. Let's try to find out the current weather in San Francisco again.\n",
"Tool Calls:\n",
" tavily_search_results_json (call_G6x1cxoXQbRBPZ8i18X40j0d)\n",
" Call ID: call_G6x1cxoXQbRBPZ8i18X40j0d\n",
" Args:\n",
" query: current weather in San Francisco\n",
"=================================\u001b[1m Tool Message \u001b[0m=================================\n",
"Name: tavily_search_results_json\n",
"\n",
"[{\"url\": \"https://www.weatherapi.com/\", \"content\": \"{'location': {'name': 'San Francisco', 'region': 'California', 'country': 'United States of America', 'lat': 37.78, 'lon': -122.42, 'tz_id': 'America/Los_Angeles', 'localtime_epoch': 1718290752, 'localtime': '2024-06-13 7:59'}, 'current': {'last_updated_epoch': 1718289900, 'last_updated': '2024-06-13 07:45', 'temp_c': 14.4, 'temp_f': 57.9, 'is_day': 1, 'condition': {'text': 'Partly cloudy', 'icon': '//cdn.weatherapi.com/weather/64x64/day/116.png', 'code': 1003}, 'wind_mph': 2.2, 'wind_kph': 3.6, 'wind_degree': 10, 'wind_dir': 'N', 'pressure_mb': 1013.0, 'pressure_in': 29.92, 'precip_mm': 0.01, 'precip_in': 0.0, 'humidity': 84, 'cloud': 75, 'feelslike_c': 13.4, 'feelslike_f': 56.0, 'windchill_c': 10.1, 'windchill_f': 50.1, 'heatindex_c': 11.7, 'heatindex_f': 53.1, 'dewpoint_c': 8.8, 'dewpoint_f': 47.9, 'vis_km': 16.0, 'vis_miles': 9.0, 'uv': 3.0, 'gust_mph': 12.7, 'gust_kph': 20.4}}\"}]\n",
"==================================\u001b[1m Ai Message \u001b[0m==================================\n",
"\n",
"Of course! I always strive to be polite and helpful.\n",
"\n",
"Currently, in San Francisco, it is partly cloudy with a temperature of approximately 14.4°C (57.9°F). The wind is blowing from the north at around 2.2 mph (3.6 kph). The humidity level is quite high at 84%, and visibility is good at 16 km (9 miles).\n",
"\n",
"Is there anything else you would like to know?\n"
]
}
],
"source": [
"inputs = {\"messages\": [(\"user\", \"What's your name? And what's the weather in SF?\")]}\n",
"print_stream(graph.stream(inputs, stream_mode=\"values\"))"
]
},
{
"cell_type": "markdown",
"id": "0af418b8-bdd3-4e10-a552-9d8d2a409a57",
"metadata": {},
"source": [
"## How to: add memory to `create_react_agent`"
]
},
{
"cell_type": "markdown",
"id": "4eef6365-530b-4d33-9874-41273ebee510",
"metadata": {},
"source": [
"We can add \"chat memory\" to the graph with LangGraph's checkpointer, to retain the chat context between interactions"
]
},
{
"cell_type": "code",
"execution_count": 19,
"id": "dfd72a3c-3ff9-4bc3-ab51-f3c8424e7932",
"metadata": {},
"outputs": [],
"source": [
"from langgraph.checkpoint import MemorySaver\n",
"graph = create_react_agent(model, tools, checkpointer=MemorySaver())"
]
},
{
"cell_type": "code",
"execution_count": 20,
"id": "3db05867-1ced-402c-b739-72afda037e7f",
"metadata": {},
"outputs": [],
"source": [
"config = {\"configurable\": {\"thread_id\": \"1\"}}\n",
"inputs = {\"messages\": [(\"user\", \"What's the weather in SF?\")]}"
]
},
{
"cell_type": "code",
"execution_count": 21,
"id": "fcf1f692-b437-4f8d-9a75-94a018e90a7c",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"================================\u001b[1m Human Message \u001b[0m=================================\n",
"\n",
"What's the weather in SF?\n",
"==================================\u001b[1m Ai Message \u001b[0m==================================\n",
"Tool Calls:\n",
" tavily_search_results_json (call_SQua8Xc6fLjtJlS8CvaCxH2U)\n",
" Call ID: call_SQua8Xc6fLjtJlS8CvaCxH2U\n",
" Args:\n",
" query: current weather in San Francisco\n",
"=================================\u001b[1m Tool Message \u001b[0m=================================\n",
"Name: tavily_search_results_json\n",
"\n",
"[{\"url\": \"https://www.weatherapi.com/\", \"content\": \"{'location': {'name': 'San Francisco', 'region': 'California', 'country': 'United States of America', 'lat': 37.78, 'lon': -122.42, 'tz_id': 'America/Los_Angeles', 'localtime_epoch': 1718290938, 'localtime': '2024-06-13 8:02'}, 'current': {'last_updated_epoch': 1718290800, 'last_updated': '2024-06-13 08:00', 'temp_c': 14.4, 'temp_f': 57.9, 'is_day': 1, 'condition': {'text': 'Partly cloudy', 'icon': '//cdn.weatherapi.com/weather/64x64/day/116.png', 'code': 1003}, 'wind_mph': 2.2, 'wind_kph': 3.6, 'wind_degree': 10, 'wind_dir': 'N', 'pressure_mb': 1013.0, 'pressure_in': 29.92, 'precip_mm': 0.0, 'precip_in': 0.0, 'humidity': 84, 'cloud': 75, 'feelslike_c': 13.4, 'feelslike_f': 56.2, 'windchill_c': 11.1, 'windchill_f': 52.0, 'heatindex_c': 12.5, 'heatindex_f': 54.6, 'dewpoint_c': 8.8, 'dewpoint_f': 47.9, 'vis_km': 16.0, 'vis_miles': 9.0, 'uv': 4.0, 'gust_mph': 11.3, 'gust_kph': 18.1}}\"}]\n",
"==================================\u001b[1m Ai Message \u001b[0m==================================\n",
"\n",
"The current weather in San Francisco is partly cloudy with a temperature of 14.4°C (57.9°F). The wind is blowing from the north at 2.2 mph (3.6 kph). Humidity is at 84%, and visibility is 16 km (9 miles). The UV index is 4.\n"
]
}
],
"source": [
"print_stream(graph.stream(inputs, config=config, stream_mode=\"values\"))"
]
},
{
"cell_type": "markdown",
"id": "4541ea58-ee6a-4685-a988-c915a42284e6",
"metadata": {},
"source": [
"Notice that when we pass the same the same thread ID, the chat history is preserved"
]
},
{
"cell_type": "code",
"execution_count": 22,
"id": "b509417b-70f3-4736-b838-5d1729ed759e",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"================================\u001b[1m Human Message \u001b[0m=================================\n",
"\n",
"How about NYC?\n",
"==================================\u001b[1m Ai Message \u001b[0m==================================\n",
"Tool Calls:\n",
" tavily_search_results_json (call_s3cYMxsn11IfPxEMsxMp9Ycb)\n",
" Call ID: call_s3cYMxsn11IfPxEMsxMp9Ycb\n",
" Args:\n",
" query: current weather in New York City\n",
"=================================\u001b[1m Tool Message \u001b[0m=================================\n",
"Name: tavily_search_results_json\n",
"\n",
"[{\"url\": \"https://www.weatherapi.com/\", \"content\": \"{'location': {'name': 'New York', 'region': 'New York', 'country': 'United States of America', 'lat': 40.71, 'lon': -74.01, 'tz_id': 'America/New_York', 'localtime_epoch': 1718290946, 'localtime': '2024-06-13 11:02'}, 'current': {'last_updated_epoch': 1718290800, 'last_updated': '2024-06-13 11:00', 'temp_c': 23.9, 'temp_f': 75.0, 'is_day': 1, 'condition': {'text': 'Sunny', 'icon': '//cdn.weatherapi.com/weather/64x64/day/113.png', 'code': 1000}, 'wind_mph': 2.2, 'wind_kph': 3.6, 'wind_degree': 10, 'wind_dir': 'N', 'pressure_mb': 1018.0, 'pressure_in': 30.05, 'precip_mm': 0.0, 'precip_in': 0.0, 'humidity': 55, 'cloud': 0, 'feelslike_c': 24.9, 'feelslike_f': 76.7, 'windchill_c': 26.1, 'windchill_f': 78.9, 'heatindex_c': 26.2, 'heatindex_f': 79.2, 'dewpoint_c': 12.5, 'dewpoint_f': 54.6, 'vis_km': 16.0, 'vis_miles': 9.0, 'uv': 7.0, 'gust_mph': 7.2, 'gust_kph': 11.6}}\"}]\n",
"==================================\u001b[1m Ai Message \u001b[0m==================================\n",
"\n",
"The current weather in New York City is sunny with a temperature of 23.9°C (75.0°F). The wind is blowing from the north at 2.2 mph (3.6 kph). Humidity is at 55%, and visibility is 16 km (9 miles). The UV index is 7.\n"
]
}
],
"source": [
"inputs = {\"messages\": [(\"user\", \"How about NYC?\")]}\n",
"print_stream(graph.stream(inputs, config=config, stream_mode=\"values\"))"
]
},
{
"cell_type": "markdown",
"id": "ef765ab6-3ea0-4de0-8737-de8f9d9add40",
"metadata": {},
"source": [
"And if we pass a different thread ID, the chat history is reset"
]
},
{
"cell_type": "code",
"execution_count": 23,
"id": "1bb09dbe-bbba-4e8f-b44c-b18bd2ed96ff",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"================================\u001b[1m Human Message \u001b[0m=================================\n",
"\n",
"How about NYC?\n",
"==================================\u001b[1m Ai Message \u001b[0m==================================\n",
"Tool Calls:\n",
" tavily_search_results_json (call_uXGI87Qw09CHNiDgYBgOrhoJ)\n",
" Call ID: call_uXGI87Qw09CHNiDgYBgOrhoJ\n",
" Args:\n",
" query: current news in NYC\n",
"=================================\u001b[1m Tool Message \u001b[0m=================================\n",
"Name: tavily_search_results_json\n",
"\n",
"[{\"url\": \"https://abc7ny.com/\", \"content\": \"New York's source for breaking news, weather and live video. Covering NYC, New Jersey, Long Island and all of the greater New York City area.\"}]\n",
"==================================\u001b[1m Ai Message \u001b[0m==================================\n",
"\n",
"For the latest news in NYC, you can visit [ABC7 New York](https://abc7ny.com/). They provide updates on breaking news, weather, and live video coverage for New York City, New Jersey, Long Island, and the greater NYC area.\n"
]
}
],
"source": [
"inputs = {\"messages\": [(\"user\", \"How about NYC?\")]}\n",
"print_stream(graph.stream(inputs, config={\"configurable\": {\"thread_id\": 2}}, stream_mode=\"values\"))"
]
},
{
"cell_type": "markdown",
"id": "42e730aa-8fac-48a5-9c67-b51393665469",
"metadata": {},
"source": [
"## How to: add human-in-the-loop to `create_react_agent`"
]
},
{
"cell_type": "markdown",
"id": "6314e49c-9143-45a8-871b-8bd3f489425c",
"metadata": {},
"source": [
"Let's add an interrupt to let the user confirm before LLM takes an action:"
]
},
{
"cell_type": "code",
"execution_count": 24,
"id": "fe93def9-6ba4-4c89-9e84-1ff607dbfc8c",
"metadata": {},
"outputs": [],
"source": [
"graph = create_react_agent(\n",
" model, tools, interrupt_before=[\"tools\"], checkpointer=MemorySaver()\n",
")\n",
"\n",
"config = {\"configurable\": {\"thread_id\": \"42\"}}\n",
"inputs = {\"messages\": [(\"user\", \"What's the weather in SF?\")]}"
]
},
{
"cell_type": "code",
"execution_count": 25,
"id": "4d934d6a-6550-453b-8c23-fbb8b4656da6",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"================================\u001b[1m Human Message \u001b[0m=================================\n",
"\n",
"What's the weather in SF?\n",
"==================================\u001b[1m Ai Message \u001b[0m==================================\n",
"Tool Calls:\n",
" tavily_search_results_json (call_Wg4AZqacqqUHHmQfjOjudAyP)\n",
" Call ID: call_Wg4AZqacqqUHHmQfjOjudAyP\n",
" Args:\n",
" query: current weather in San Francisco\n"
]
}
],
"source": [
"print_stream(graph.stream(inputs, config, stream_mode=\"values\"))"
]
},
{
"cell_type": "code",
"execution_count": 26,
"id": "493d4963-b27b-46ef-8474-1527b08c1c03",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"Next step: ('tools',)\n"
]
}
],
"source": [
"snapshot = graph.get_state(config)\n",
"print(\"Next step: \", snapshot.next)"
]
},
{
"cell_type": "code",
"execution_count": 27,
"id": "7ad01f3a-e838-4230-ab07-2f850bb7e7cb",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"=================================\u001b[1m Tool Message \u001b[0m=================================\n",
"Name: tavily_search_results_json\n",
"\n",
"[{\"url\": \"https://www.weatherapi.com/\", \"content\": \"{'location': {'name': 'San Francisco', 'region': 'California', 'country': 'United States of America', 'lat': 37.78, 'lon': -122.42, 'tz_id': 'America/Los_Angeles', 'localtime_epoch': 1718290938, 'localtime': '2024-06-13 8:02'}, 'current': {'last_updated_epoch': 1718290800, 'last_updated': '2024-06-13 08:00', 'temp_c': 14.4, 'temp_f': 57.9, 'is_day': 1, 'condition': {'text': 'Partly cloudy', 'icon': '//cdn.weatherapi.com/weather/64x64/day/116.png', 'code': 1003}, 'wind_mph': 2.2, 'wind_kph': 3.6, 'wind_degree': 10, 'wind_dir': 'N', 'pressure_mb': 1013.0, 'pressure_in': 29.92, 'precip_mm': 0.0, 'precip_in': 0.0, 'humidity': 84, 'cloud': 75, 'feelslike_c': 13.4, 'feelslike_f': 56.2, 'windchill_c': 11.1, 'windchill_f': 52.0, 'heatindex_c': 12.5, 'heatindex_f': 54.6, 'dewpoint_c': 8.8, 'dewpoint_f': 47.9, 'vis_km': 16.0, 'vis_miles': 9.0, 'uv': 4.0, 'gust_mph': 11.3, 'gust_kph': 18.1}}\"}]\n",
"==================================\u001b[1m Ai Message \u001b[0m==================================\n",
"\n",
"The current weather in San Francisco is:\n",
"\n",
"- **Temperature**: 14.4°C (57.9°F)\n",
"- **Condition**: Partly cloudy\n",
"- **Wind**: 2.2 mph (3.6 kph) from the north\n",
"- **Humidity**: 84%\n",
"- **Visibility**: 16 km (9 miles)\n",
"- **UV Index**: 4\n",
"\n",
"![Weather Icon](//cdn.weatherapi.com/weather/64x64/day/116.png)\n"
]
}
],
"source": [
"print_stream(graph.stream(None, config, stream_mode=\"values\"))"
]
}
],
"metadata": {
"kernelspec": {
"display_name": "langgraph-example-dev",
"language": "python",
"name": "langgraph-example-dev"
},
"language_info": {
"codemirror_mode": {
"name": "ipython",
"version": 3
},
"file_extension": ".py",
"mimetype": "text/x-python",
"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython3",
"version": "3.11.9"
}
},
"nbformat": 4,
"nbformat_minor": 5
}
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