Dynamic Tools

Build the tool list at runtime from a function that reads session state off the RunContext.

dynamic_tools.py
"""
Dynamic Tools
=============================

Dynamic Tools.
"""

from datetime import datetime, timezone

from agno.agent import Agent
from agno.models.openai import OpenAIResponses
from agno.run import RunContext


def get_runtime_tools(run_context: RunContext):
    """Return tools dynamically based on session state."""

    def get_time() -> str:
        return datetime.now(timezone.utc).isoformat()

    def get_project() -> str:
        project = (run_context.session_state or {}).get("project", "unknown")
        return f"Current project: {project}"

    return [get_time, get_project]


# ---------------------------------------------------------------------------
# Create Agent
# ---------------------------------------------------------------------------
agent = Agent(
    name="Dynamic Tools Agent",
    model=OpenAIResponses(id="gpt-5.2"),
    tools=get_runtime_tools,
)

# ---------------------------------------------------------------------------
# Run Agent
# ---------------------------------------------------------------------------
if __name__ == "__main__":
    agent.print_response(
        "Use available tools to report current context.",
        session_state={"project": "cookbook-restructure"},
        stream=True,
    )

Resolve the factory for each run

Add cache_callables=False to this Agent constructor before running. The returned get_project function closes over its RunContext. Default callable caching reuses that closure for the same user or session, so a later run can report the first run's project. Disabling caching makes this state-dependent factory run again with the current context.

Run the Example

Set up your virtual environment

uv venv --python 3.12
source .venv/bin/activate

Install dependencies

uv pip install -U agno openai

Export your OpenAI API key

export OPENAI_API_KEY="your_openai_api_key_here"

Run the example

Save the code above as dynamic_tools.py, then run:

python dynamic_tools.py

Full source: cookbook/02_agents/15_dependencies/dynamic_tools.py