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When we call Agent.run(), it creates a stateless, singular Agent run. But what if we want to continue this conversation i.e. have a multi-turn conversation? That’s where “Sessions” come in. A session is collection of consecutive runs. In practice, a session is a multi-turn conversation between a user and an Agent. Using a session_id, we can connect the conversation history and state across multiple runs. Here are the core concepts:
  • Session: A session is collection of consecutive runs like a multi-turn conversation between a user and an Agent. Sessions are identified by a session_id and house all runs, metrics, state and other data that belong to the session.
  • Run: Every interaction (i.e. chat or turn) with an Agent is called a run. Runs are identified by a run_id and Agent.run() creates a new run_id when called.
  • Messages: are the individual messages sent between the model and the Agent. Messages are the communication protocol between the Agent and model.
See Session Storage for more details on how sessions are stored.

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Single session

Here we have an example where a single run is created with an Agent. A run_id is automatically generated, as well as a session_id (because we didn’t provide one tot yet associated with a user. 
from agno.agent import Agent
from agno.models.openai import OpenAIChat

agent = Agent(model=OpenAIChat(id="gpt-5-mini"))

# Run agent and return the response as a variable
response = agent.run("Tell me a 5 second short story about a robot")
print(response.content)
print(response.run_id)
print(response.session_id)

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Multi-Turn Sessions

Each user that is interacting with an Agent gets a unique set of sessions and you can have multiple users interacting with the same Agent at the same time. Set a user_id to connect a user to their sessions with the Agent. In the example below, we set a session_id to demo how to have multi-turn conversations with multiple users at the same time.
1

Multi-user, multi-session example

from agno.agent import Agent
from agno.models.openai import OpenAIChat
from agno.db.sqlite import SqliteDb

db = SqliteDb(db_file="tmp/data.db")

agent = Agent(
    model=OpenAIChat(id="gpt-5-mini"),
    db=db,
    add_history_to_context=True,
    num_history_runs=3,
)

user_1_id = "user_101"
user_2_id = "user_102"

user_1_session_id = "session_101"
user_2_session_id = "session_102"

# Start the session with user 1
agent.print_response(
    "Tell me a 5 second short story about a robot.",
    user_id=user_1_id,
    session_id=user_1_session_id,
)
# Continue the session with user 1
agent.print_response("Now tell me a joke.", user_id=user_1_id, session_id=user_1_session_id)

# Start the session with user 2
agent.print_response("Tell me about quantum physics.", user_id=user_2_id, session_id=user_2_session_id)

# Continue the session with user 2
agent.print_response("What is the speed of light?", user_id=user_2_id, session_id=user_2_session_id)

# Ask the agent to give a summary of the conversation, this will use the history from the previous messages (but only for user 1)
agent.print_response(
    "Give me a summary of our conversation.",
    user_id=user_1_id,
    session_id=user_1_session_id,
)
2

Run the example

Install libraries
pip install agno openai
Export your key
export OPENAI_API_KEY=xxx
Run the example
python multi_user_multi_session.py
For session history and management, you need to have a database assigned to the agent. See Storage for more details.

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History in Context

As in the example above, we can add the history of the conversation to the context using add_history_to_context. You can specify this parameter on the Agent or on the run() method. 
from agno.agent import Agent
from agno.models.openai import OpenAIChat
from agno.db.in_memory import InMemoryDb

agent = Agent(model=OpenAIChat(id="gpt-5-mini"), db=InMemoryDb())

agent.print_response("Hi, I'm John. Nice to meet you!")

agent.print_response("What is my name?", add_history_to_context=True)
Learn more in the Context Engineering documentation.

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Session Summaries

The Agent can store a condensed representations of the session, useful when chat histories gets too long. This is called a “Session Summary” in Agno. To enable session summaries, set enable_session_summaries=True on the Agent.
1

Session summary example

session_summary.py
from agno.agent import Agent
from agno.models.google.gemini import Gemini
from agno.db.sqlite import SqliteDb

db = SqliteDb(db_file="tmp/data.db")

user_id = "jon_hamm@example.com"
session_id = "1001"

agent = Agent(
    model=Gemini(id="gemini-2.0-flash-exp"),
    db=db,
    enable_session_summaries=True,
)

agent.print_response(
    "What can you tell me about quantum computing?",
    stream=True,
    user_id=user_id,
    session_id=session_id,
)

agent.print_response(
    "I would also like to know about LLMs?",
    stream=True,
    user_id=user_id,
    session_id=session_id
)

session_summary = agent.get_session_summary(session_id=session_id)
print(f"Session summary: {session_summary.summary}")
2

Run the example

Install libraries
pip install google-genai agno
Export your key
export GOOGLE_API_KEY=xxx
Run the example
python session_summary.py

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Customize Session Summaries

You can adjust the session summaries by providing a custom session_summary_prompt to the Agent. The SessionSummaryManager class is responsible for handling the model used to create and update session summaries. You can adjust it to personalize how summaries are created and updated: 
from agno.agent import Agent
from agno.session import SessionSummaryManager
from agno.models.openai import OpenAIChat
from agno.db.sqlite import SqliteDb

# Setup your database
db = SqliteDb(db_file="agno.db")

# Setup your Session Summary Manager, to adjust how summaries are created
session_summary_manager = SessionSummaryManager(
    # Select the model used for session summary creation and updates. If not specified, the agent's model is used by default.
    model=OpenAIChat(id="gpt-5-mini"),
    # You can also overwrite the prompt used for session summary creation
    session_summary_prompt="Create a very succinct summary of the following conversation:",
)

# Now provide the adjusted Memory Manager to your Agent
agent = Agent(
    db=db,
    session_summary_manager=session_summary_manager,
    enable_session_summaries=True,
)

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Session history

Agents with storage enabled automatically have access to the message and run history of the session. You can access these messages using:
  • agent.get_messages_for_session() -> Gets access to all the messages for the session, for the current agent.
  • agent.get_chat_history() -> Gets access to all the unique messages for the session.
We can give the Agent access to the chat history in the following ways:
  • We can set add_history_to_context=True and num_history_runs=5 to add the messages from the last 5 runs automatically to every message sent to the agent.
  • We can set read_chat_history=True to provide a get_chat_history() tool to your agent allowing it to read any message in the entire chat history.
  • We recommend setting all 3: add_history_to_context=True, num_history_runs=3 and read_chat_history=True for the best experience.
  • We can also set read_tool_call_history=True to provide a get_tool_call_history() tool to your agent allowing it to read tool calls in reverse chronological order.
Take a look at this example:
1

Session history example

session_history.py
from agno.agent import Agent
from agno.models.google.gemini import Gemini
from agno.db.sqlite import SqliteDb

agent = Agent(
    model=Gemini(id="gemini-2.0-flash-exp"),
    db=SqliteDb(db_file="tmp/data.db"),
    add_history_to_context=True,
    num_history_runs=3,
    read_chat_history=True,
    description="You are a helpful assistant that always responds in a polite, upbeat and positive manner.",
)

agent.print_response("Share a 2 sentence horror story", stream=True)

agent.print_response("What was my first message?", stream=True)
2

Run the example

Install libraries
pip install google-genai agno
Export your key
export GOOGLE_API_KEY=xxx
Run the example
python session_history.py

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Search the session history

In some scenarios, you might want to fetch messages from across multiple sessions to provide context or continuity in conversations. To enable fetching messages from the last N sessions, you need to use the following flags:
  • search_session_history: Set this to True to allow searching through previous sessions.
  • num_history_sessions: Specify the number of past sessions to include in the search. In the example below, it is set to 2 to include only the last 2 sessions.
It’s advisable to keep this number low (2 or 3), as a larger number might fill up the context length of the model, potentially leading to performance issues. Here’s an example of searching through the last 2 sessions: 
# Remove the tmp db file before running the script
import os

from agno.agent import Agent
from agno.models.openai import OpenAIChat
from agno.db.sqlite import SqliteDb

os.remove("tmp/data.db")

db = SqliteDb(db_file="tmp/data.db")

agent = Agent(
    model=OpenAIChat(id="gpt-5-mini"),
    user_id="user_1",
    db=db,
    search_session_history=True,  # allow searching previous sessions
    num_history_sessions=2,  # only include the last 2 sessions in the search to avoid context length issues
)

session_1_id = "session_1_id"
session_2_id = "session_2_id"
session_3_id = "session_3_id"
session_4_id = "session_4_id"
session_5_id = "session_5_id"

agent.print_response("What is the capital of South Africa?", session_id=session_1_id)
agent.print_response("What is the capital of China?", session_id=session_2_id)
agent.print_response("What is the capital of France?", session_id=session_3_id)
agent.print_response("What is the capital of Japan?", session_id=session_4_id)
agent.print_response(
    "What did I discuss in my previous conversations?", session_id=session_5_id
)  # It should only include the last 2 sessions

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Developer Resources

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