Goose is a batteries‑included Python library and CLI for validating LLM agents end‑to‑end.
Design conversational test cases, run them locally or in CI, and (optionally) plug in a React dashboard – all while staying in Python.
Turn your “vibes‑based” LLM evaluations into repeatable, versioned tests instead of “it felt smart on that one prompt” QA.
Think of Goose as pytest for LLM agents:
- Stop guessing – Encode expectations once, rerun them on every model/version/deploy.
- See what actually happened – Rich execution traces, validation results, and per‑step history.
- Fits your stack – Wraps your existing agents and tools; no framework rewrite required.
- Stay in Python – Pydantic models, type hints, and a straightforward API.
Install the core library and CLI from PyPI:
pip install llm-gooseAt its core, Goose lets you describe what a good interaction looks like and then assert that your agent and tools actually behave that way.
You provide a callable that takes a query and talks to your model (OpenAI, Bedrock, internal API, …):
from typing import Any
from goose.testing import Goose
def my_agent(query: str) -> dict[str, Any]:
"""Call your LLM here and normalize the response for Goose."""
... # e.g. call OpenAI, Anthropic, or your own router
goose = Goose(my_agent)Goose cases combine a natural‑language query, human‑readable expectations, and (optionally) the tools
you expect the agent to call. This example is adapted from
example_tests/agent_behaviour_test.py and shows an analytical workflow where the agent both
retrieves data and computes aggregates:
from __future__ import annotations
from example_system.models import Transaction
from example_system.tools import calculate_revenue, get_sales_history
from goose.testing import Goose
def test_sales_history_with_revenue_analysis(goose: Goose) -> None:
"""What were sales in October 2025 and the total revenue?"""
transactions = Transaction.objects.prefetch_related("items__product").all()
total_revenue = sum(
item.price_usd * item.quantity
for txn in transactions
for item in txn.items.all()
)
goose.case(
query="What were our sales in October 2025 and how much total revenue?",
expectations=[
"Agent retrieved sales history for October 2025",
"Agent calculated total revenue from the retrieved transactions",
"Response included the sample transaction from October 15",
f"Response showed total revenue of ${total_revenue:.2f}",
"Agent used sales history data to compute revenue totals",
],
expected_tool_calls=[get_sales_history, calculate_revenue],
)In the full example suite, the goose fixture comes from example_tests/conftest.py, where it wraps
the example agent and seeds sample data using @fixture from goose.testing.
Goose is pytest‑inspired: tests are just functions, and you can mix Goose expectations with regular assertions. That makes intentional failure cases straightforward to express and debug:
from example_system.models import Product
from example_system.tools import get_product_details
def test_failure_assertion_missing_products(goose: Goose) -> None:
"""Intentional failure to verify assertion handling."""
goose.case(
query="What's the price of Hiking Boots?",
expectations=["Agent provided the correct price"],
expected_tool_calls=[get_product_details],
)
# This assertion is designed to fail – fixtures populate products
assert Product.objects.count() == 0, "Intentional failure: products are populated in fixtures"When you run this test, Goose will surface both expectation mismatches (if any) and the failing assertion in the same run, just like you’d expect from a testing framework.
Use the bundled CLI (installed as the goose command) to discover and execute your test modules:
# execute every test module under example_tests/
goose run example_tests
# list discovered tests without running them
goose run --list example_testsFor richer workflows (and the React dashboard), Goose ships an example Django system and a FastAPI jobs API. These live in this repo only – they are not installed with the PyPI package – but you can run them locally for inspiration or internal tooling.
On the dashboard, the main grid view shows one card per test in your suite, with a status pill
(Passed, Failed, Queued, Running, or Not Run), the most recent duration if it has been
executed, and any top‑level error from the last run. Toggling the "only failures" filter collapses the
grid down to just the failing tests so you can quickly see which checks are red, which have never
been executed, and which ones are currently running.
When you click into a test, the detail view shows a header with the test name, module path, latest status and duration, plus the original docstring so you remember what the scenario is meant to cover. Below that, an execution history lists each run as a card: you see every expectation with a green check or red cross, along with the validator's reasoning explaining why the run was considered a success or failure. For each step, the underlying messages are rendered as human / AI / tool bubbles, including tool calls and JSON payloads; if something went wrong mid‑run, the captured error text is shown at the bottom of the card.
When you install the api extra, you get an additional console script:
api– starts the FastAPI job orchestration server
Install with extras:
pip install "llm-goose[api]"Then launch the service from your project (for example, after wiring Goose into your own system):
# start the API server (FastAPI + Uvicorn)
apiThe React dashboard shown in the screenshots lives in this repo under web/ and is not shipped as
part of the PyPI package.
The React dashboard is a separate web application that talks to the Goose jobs API over HTTP. It is built with Vite, React, and Tailwind and is designed to be run either locally during development or deployed as a static site.
Install the published CLI from npm and let it host the built dashboard for you:
npm install -g @llm-goose/dashboard-cli
# point the dashboard at your jobs API
GOOSE_API_URL="http://localhost:8000" goose-dashboardThis starts a small HTTP server (by default on http://localhost:8001) that serves the
prebuilt dashboard against whatever Goose API URL you configure.
MIT License – see LICENSE for full text.