diff --git a/changelog/5.feature.md b/changelog/5.feature.md
new file mode 100644
index 0000000..cfe123f
--- /dev/null
+++ b/changelog/5.feature.md
@@ -0,0 +1,3 @@
+Adds the concept of MetricProvider's and Metrics to the core.
+These represent the functionality that metric providers must implement in order to be part of the REF.
+The implementation is still a work in progress and will be expanding in follow-up PRs.
diff --git a/docs/explanation.md b/docs/explanation.md
index ba4e8f3..acaf71b 100644
--- a/docs/explanation.md
+++ b/docs/explanation.md
@@ -12,6 +12,33 @@ Points we will aim to cover:
 We will aim to avoid writing instructions or technical descriptions here,
 they belong elsewhere.
 
+## Metric Providers
+
+The REF aims to support a variety of metric providers.
+These providers are responsible for performing the calculations and analyses.
+
+Each metric provider generally provides a number of different metrics that can be calculated.
+An example implementation of a metric provider is provided in the `ref_metrics_example` package.
+
+### Metrics
+
+A metric represents a specific calculation or analysis that can be performed on a dataset
+or set of datasets with the aim for benchmarking the performance of different models.
+These metrics often represent a specific aspects of the Earth system and are compared against
+observations of the same quantities.
+
+A metric depends upon a set of input model data and observation datasets.
+
+The result of a metric calculation can be a range of different outcomes:
+
+* A single scalar value
+* Timeseries
+* Plots
+
+The Earth System Metrics and Diagnostics Standards
+([EMDS](https://github.com/Earth-System-Diagnostics-Standards/EMDS))
+provide a community standard for reporting outputs.
+This enables the ability to generate standardised outputs that can be distributed.
 
 ## Execution Environments
 
diff --git a/packages/ref-core/pyproject.toml b/packages/ref-core/pyproject.toml
index 15592f5..464cf1e 100644
--- a/packages/ref-core/pyproject.toml
+++ b/packages/ref-core/pyproject.toml
@@ -21,10 +21,12 @@ classifiers = [
     "Topic :: Scientific/Engineering",
 ]
 dependencies = [
+    "attrs"
 ]
 
 [tool.uv]
 dev-dependencies = [
+
 ]
 
 [build-system]
diff --git a/packages/ref-core/src/ref_core/executor/__init__.py b/packages/ref-core/src/ref_core/executor/__init__.py
index 1fd0235..5c4ceb4 100644
--- a/packages/ref-core/src/ref_core/executor/__init__.py
+++ b/packages/ref-core/src/ref_core/executor/__init__.py
@@ -13,9 +13,11 @@
 """
 
 import os
-from typing import Protocol, runtime_checkable
+from typing import Any, Protocol, runtime_checkable
 
-from .local import LocalExecutor
+from ref_core.executor.local import LocalExecutor
+from ref_core.metrics import Configuration, Metric, MetricResult, TriggerInfo
+from ref_core.providers import MetricsProvider
 
 
 @runtime_checkable
@@ -33,11 +35,30 @@ class Executor(Protocol):
 
     name: str
 
-    def run_metric(self, metric: object, *args, **kwargs) -> object:  # type: ignore
+    def run_metric(
+        self, metric: Metric, configuration: Configuration, trigger: TriggerInfo | None, **kwargs: Any
+    ) -> MetricResult:
         """
         Execute a metric
+
+        Parameters
+        ----------
+        metric
+            Metric to run
+        configuration
+            Configuration to run the metric with
+        trigger
+            Information about the dataset that triggered the metric run
+
+            TODO: The optionality of this parameter is a placeholder and will be expanded in the future.
+        kwargs
+            Additional keyword arguments for the executor
+
+        Returns
+        -------
+        :
+            Results from running the metric
         """
-        # TODO: Add type hints for metric and return value in follow-up PR
         ...
 
 
@@ -94,7 +115,7 @@ def get(self, name: str) -> Executor:
 get_executor = _default_manager.get
 
 
-def run_metric(metric_name: str, *args, **kwargs) -> object:  # type: ignore
+def run_metric(metric_name: str, /, metrics_provider: MetricsProvider, **kwargs: Any) -> MetricResult:
     """
     Run a metric using the default executor
 
@@ -107,13 +128,10 @@ def run_metric(metric_name: str, *args, **kwargs) -> object:  # type: ignore
     ----------
     metric_name
         Name of the metric to run.
-
-        Eventually the metric will be sourced from via some kind of registry.
-        For now, it's just a placeholder.
-    args
-        Extra arguments passed to the metric of interest
+    metrics_provider
+        Provider from where to retrieve the metric
     kwargs
-        Extra keyword arguments passed to the metric of interest
+        Additional options passed to the metric executor
 
     Returns
     -------
@@ -123,10 +141,14 @@ def run_metric(metric_name: str, *args, **kwargs) -> object:  # type: ignore
     executor_name = os.environ.get("CMIP_REF_EXECUTOR", "local")
 
     executor = get_executor(executor_name)
-    # metric = get_metric(metric_name)  # TODO: Implement this
-    metric = kwargs.pop("metric")
+    metric = metrics_provider.get(metric_name)
+
+    result = executor.run_metric(metric, trigger=None, **kwargs)
+
+    # TODO: Validate the result
+    # TODO: Log the result
 
-    return executor.run_metric(metric, *args, **kwargs)
+    return result
 
 
 register_executor(LocalExecutor())
diff --git a/packages/ref-core/src/ref_core/executor/local.py b/packages/ref-core/src/ref_core/executor/local.py
index af48231..3fdecc2 100644
--- a/packages/ref-core/src/ref_core/executor/local.py
+++ b/packages/ref-core/src/ref_core/executor/local.py
@@ -1,3 +1,8 @@
+from typing import Any
+
+from ref_core.metrics import Configuration, Metric, MetricResult, TriggerInfo
+
+
 class LocalExecutor:
     """
     Run a metric locally, in-process.
@@ -9,19 +14,26 @@ class LocalExecutor:
 
     name = "local"
 
-    def run_metric(self, metric, *args, **kwargs):  # type: ignore
+    def run_metric(
+        self, metric: Metric, configuration: Configuration, trigger: TriggerInfo | None, **kwargs: Any
+    ) -> MetricResult:
         """
         Run a metric in process
 
         Parameters
         ----------
         metric
-        args
+            Metric to run
+        configuration
+            Configuration to run the metric with
+        trigger
+            Information about the dataset that triggered the metric run
         kwargs
+            Additional keyword arguments for the executor
 
         Returns
         -------
         :
             Results from running the metric
         """
-        return metric.run(*args, **kwargs)
+        return metric.run(configuration=configuration, trigger=trigger)
diff --git a/packages/ref-core/src/ref_core/metrics.py b/packages/ref-core/src/ref_core/metrics.py
new file mode 100644
index 0000000..2d2bb02
--- /dev/null
+++ b/packages/ref-core/src/ref_core/metrics.py
@@ -0,0 +1,144 @@
+import json
+import pathlib
+from typing import Any, Protocol, runtime_checkable
+
+from attrs import frozen
+
+
+@frozen
+class Configuration:
+    """
+    Configuration that describes the input data sources
+    """
+
+    output_directory: pathlib.Path
+    """
+    Directory to write output files to
+    """
+
+    # TODO: Add more configuration options here
+
+
+@frozen
+class MetricResult:
+    """
+    The result of running a metric.
+
+    The content of the result follows the Earth System Metrics and Diagnostics Standards
+    ([EMDS](https://github.com/Earth-System-Diagnostics-Standards/EMDS/blob/main/standards.md)).
+    """
+
+    # Do we want to load a serialised version of the output bundle here or just a file path?
+
+    output_bundle: pathlib.Path | None
+    """
+    Path to the output bundle file.
+
+    The contents of this file are defined by
+    [EMDS standard](https://github.com/Earth-System-Diagnostics-Standards/EMDS/blob/main/standards.md#common-output-bundle-format-)
+    """
+    successful: bool
+    """
+    Whether the metric ran successfully.
+    """
+    # Log info is in the output bundle file already, but is definitely useful
+
+    @staticmethod
+    def build(configuration: Configuration, cmec_output_bundle: dict[str, Any]) -> "MetricResult":
+        """
+        Build a MetricResult from a CMEC output bundle.
+
+        Parameters
+        ----------
+        configuration
+            The configuration used to run the metric.
+        cmec_output_bundle
+            An output bundle in the CMEC format.
+
+            TODO: This needs a better type hint
+
+        Returns
+        -------
+        :
+            A prepared MetricResult object.
+            The output bundle will be written to the output directory.
+        """
+        with open(configuration.output_directory / "output.json", "w") as file_handle:
+            json.dump(cmec_output_bundle, file_handle)
+        return MetricResult(
+            output_bundle=configuration.output_directory / "output.json",
+            successful=True,
+        )
+
+
+@frozen
+class TriggerInfo:
+    """
+    The reason why the metric was run.
+    """
+
+    dataset: pathlib.Path
+    """
+    Path to the dataset that triggered the metric run.
+    """
+
+    # TODO:
+    # Add/remove/modified?
+    # dataset metadata
+
+
+@runtime_checkable
+class Metric(Protocol):
+    """
+    Interface for the calculation of a metric.
+
+    This is a very high-level interface to provide maximum scope for the metrics packages
+    to have differing assumptions.
+    The configuration and output of the metric should follow the
+    Earth System Metrics and Diagnostics Standards formats as much as possible.
+
+    See (ref_example.example.ExampleMetric)[] for an example implementation.
+    """
+
+    name: str
+    """
+    Name of the metric being run
+
+    This should be unique for a given provider,
+    but multiple providers can implement the same metric.
+    """
+
+    # input_variable: list[VariableDefinition]
+    """
+    TODO: implement VariableDefinition
+    Should be extend the configuration defined in EMDS
+
+    Variables that the metric requires to run
+    Any modifications to the input data will trigger a new metric calculation.
+    """
+    # observation_dataset: list[ObservationDatasetDefinition]
+    """
+    TODO: implement ObservationDatasetDefinition
+    Should be extend the configuration defined in EMDS. To check with Bouwe.
+    """
+
+    def run(self, configuration: Configuration, trigger: TriggerInfo | None) -> MetricResult:
+        """
+        Run the metric on the given configuration.
+
+        The implementation of this method method is left to the metrics providers.
+
+        A CMEC-compatible package can use: TODO: Add link to CMEC metric wrapper
+
+        Parameters
+        ----------
+        configuration : Configuration
+            The configuration to run the metric on.
+        trigger : TriggerInfo | None
+            Optional information about the dataset that triggered the metric run.
+
+        Returns
+        -------
+        MetricResult
+            The result of running the metric.
+        """
diff --git a/packages/ref-core/src/ref_core/providers.py b/packages/ref-core/src/ref_core/providers.py
new file mode 100644
index 0000000..7bc14b6
--- /dev/null
+++ b/packages/ref-core/src/ref_core/providers.py
@@ -0,0 +1,58 @@
+"""
+Interfaces for metrics providers.
+
+This defines how metrics packages interoperate with the REF framework.
+"""
+
+from ref_core.metrics import Metric
+
+
+class MetricsProvider:
+    """
+    Interface for that a metrics provider must implement.
+
+    This provides a consistent interface to multiple different metrics packages.
+    """
+
+    def __init__(self, name: str, version: str) -> None:
+        self.name = name
+        self.version = version
+
+        self._metrics: dict[str, Metric] = {}
+
+    def __len__(self) -> int:
+        return len(self._metrics)
+
+    def register(self, metric: Metric) -> None:
+        """
+        Register a metric with the manager.
+
+        Parameters
+        ----------
+        metric : Metric
+            The metric to register.
+        """
+        if not isinstance(metric, Metric):
+            raise ValueError("Metric must be an instance of Metric")
+        self._metrics[metric.name.lower()] = metric
+
+    def get(self, name: str) -> Metric:
+        """
+        Get a metric by name.
+
+        Parameters
+        ----------
+        name : str
+            Name of the metric (case-sensitive).
+
+        Raises
+        ------
+        KeyError
+            If the metric with the given name is not found.
+
+        Returns
+        -------
+        Metric
+            The requested metric.
+        """
+        return self._metrics[name.lower()]
diff --git a/packages/ref-core/tests/conftest.py b/packages/ref-core/tests/conftest.py
new file mode 100644
index 0000000..d4f3143
--- /dev/null
+++ b/packages/ref-core/tests/conftest.py
@@ -0,0 +1,43 @@
+import pytest
+from ref_core.metrics import Configuration, MetricResult, TriggerInfo
+from ref_core.providers import MetricsProvider
+
+
+class MockMetric:
+    name = "mock"
+
+    def run(self, configuration: Configuration, trigger: TriggerInfo) -> MetricResult:
+        return MetricResult(
+            output_bundle=configuration.output_directory / "output.json",
+            successful=True,
+        )
+
+
+class FailedMetric:
+    name = "failed"
+
+    def run(self, configuration: Configuration, trigger: TriggerInfo) -> MetricResult:
+        return MetricResult(
+            successful=False,
+        )
+
+
+@pytest.fixture
+def provider() -> MetricsProvider:
+    provider = MetricsProvider("mock_provider", "v0.1.0")
+    provider.register(MockMetric())
+    provider.register(FailedMetric())
+
+    return provider
+
+
+@pytest.fixture
+def mock_metric() -> MockMetric:
+    return MockMetric()
+
+
+@pytest.fixture
+def configuration(tmp_path) -> Configuration:
+    return Configuration(
+        output_directory=tmp_path,
+    )
diff --git a/packages/ref-core/tests/unit/test_executor.py b/packages/ref-core/tests/unit/test_executor.py
index ceaa3d9..120986d 100644
--- a/packages/ref-core/tests/unit/test_executor.py
+++ b/packages/ref-core/tests/unit/test_executor.py
@@ -3,16 +3,6 @@
 from ref_core.executor.local import LocalExecutor
 
 
-class MockMetric:
-    def run(self, *args, **kwargs):
-        result = {
-            "args": args,
-            "kwargs": kwargs,
-        }
-
-        return result
-
-
 class TestExecutorManager:
     def test_executor_register(self):
         manager = ExecutorManager()
@@ -30,30 +20,28 @@ def test_is_executor(self):
         assert executor.name == "local"
         assert isinstance(executor, Executor)
 
-    def test_run_metric(self):
+    def test_run_metric(self, configuration, mock_metric):
         executor = LocalExecutor()
 
-        metric = MockMetric()
-        result = executor.run_metric(metric, "test", kwarg="test")
-
-        assert result == {
-            "args": ("test",),
-            "kwargs": {"kwarg": "test"},
-        }
+        result = executor.run_metric(mock_metric, configuration, trigger=None)
+        assert result.successful
+        assert result.output_bundle == configuration.output_directory / "output.json"
 
 
 @pytest.mark.parametrize("executor_name", ["local", None])
-def test_run_metric_local(monkeypatch, executor_name):
+def test_run_metric_local(monkeypatch, executor_name, mock_metric, provider, configuration):
     if executor_name:
         monkeypatch.setenv("CMIP_REF_EXECUTOR", executor_name)
-    result = run_metric("example_metric", "test", kwarg="test", metric=MockMetric())
-    assert result == {
-        "args": ("test",),
-        "kwargs": {"kwarg": "test"},
-    }
+    result = run_metric("mock", provider, configuration=configuration)
+    assert result.successful
 
 
-def test_run_metric_unknown(monkeypatch):
+def test_run_metric_unknown_executor(monkeypatch, provider):
     monkeypatch.setenv("CMIP_REF_EXECUTOR", "missing")
     with pytest.raises(KeyError):
-        run_metric("anything", "test", kwarg="test")
+        run_metric("mock", metrics_provider=provider, kwarg="test")
+
+
+def test_run_metric_unknown_metric(monkeypatch, provider):
+    with pytest.raises(KeyError):
+        run_metric("missing", metrics_provider=provider, kwarg="test")
diff --git a/packages/ref-core/tests/unit/test_metrics.py b/packages/ref-core/tests/unit/test_metrics.py
new file mode 100644
index 0000000..d08b557
--- /dev/null
+++ b/packages/ref-core/tests/unit/test_metrics.py
@@ -0,0 +1,15 @@
+from ref_core.metrics import Configuration, MetricResult
+
+
+class TestMetricResult:
+    def test_build(self, tmp_path):
+        config = Configuration(output_directory=tmp_path)
+        result = MetricResult.build(config, {"data": "value"})
+
+        assert result.successful
+        assert result.output_bundle.exists()
+        assert result.output_bundle.is_file()
+        with open(result.output_bundle) as f:
+            assert f.read() == '{"data": "value"}'
+
+        assert result.output_bundle.is_relative_to(tmp_path)
diff --git a/packages/ref-core/tests/unit/test_providers.py b/packages/ref-core/tests/unit/test_providers.py
new file mode 100644
index 0000000..a9007cf
--- /dev/null
+++ b/packages/ref-core/tests/unit/test_providers.py
@@ -0,0 +1,29 @@
+from ref_core.metrics import Metric
+from ref_core.providers import MetricsProvider
+
+
+class TestMetricsProvider:
+    def test_provider(self):
+        provider = MetricsProvider("provider_name", "v0.23")
+
+        assert provider.name == "provider_name"
+        assert provider.version == "v0.23"
+        assert len(provider) == 0
+
+    def test_provider_register(self, mock_metric):
+        provider = MetricsProvider("provider_name", "v0.23")
+        provider.register(mock_metric)
+
+        assert len(provider) == 1
+        assert "mock" in provider._metrics
+        assert isinstance(provider.get("mock"), Metric)
+
+    def test_provider_fixture(self, provider):
+        assert provider.name == "mock_provider"
+        assert provider.version == "v0.1.0"
+        assert len(provider) == 2
+        assert "mock" in provider._metrics
+        assert "failed" in provider._metrics
+
+        result = provider.get("mock")
+        assert isinstance(result, Metric)
diff --git a/packages/ref-metrics-example/README.md b/packages/ref-metrics-example/README.md
index 7c497c5..f8c4c84 100644
--- a/packages/ref-metrics-example/README.md
+++ b/packages/ref-metrics-example/README.md
@@ -1,4 +1,6 @@
-# ref-core
+# ref-metrics-example
 
-This package provides the core functionality for the REF.
-This package is designed to be a library so may be published and consumed by othe packages if needed.
+An example of a basic REF metrics provider.
+
+This package provides an example of how to implement a REF metrics provider,
+that exposes a single metric, `example_metric`, which is a simple counter.
diff --git a/packages/ref-metrics-example/pyproject.toml b/packages/ref-metrics-example/pyproject.toml
index d6310a4..a76af08 100644
--- a/packages/ref-metrics-example/pyproject.toml
+++ b/packages/ref-metrics-example/pyproject.toml
@@ -21,7 +21,10 @@ classifiers = [
     "Topic :: Scientific/Engineering",
 ]
 dependencies = [
-    "ref-core"
+    "ref-core",
+    "xarray >= 2022",
+    "netcdf4",
+    "dask>=2024.10.0",
 ]
 
 [tool.uv]
diff --git a/packages/ref-metrics-example/src/ref_metrics_example/__init__.py b/packages/ref-metrics-example/src/ref_metrics_example/__init__.py
index 6bdc8a8..f645a72 100644
--- a/packages/ref-metrics-example/src/ref_metrics_example/__init__.py
+++ b/packages/ref-metrics-example/src/ref_metrics_example/__init__.py
@@ -4,5 +4,13 @@
 
 import importlib.metadata
 
+from ref_core.providers import MetricsProvider
+
+from ref_metrics_example.example import ExampleMetric
+
 __version__ = importlib.metadata.version("ref_metrics_example")
 __core_version__ = importlib.metadata.version("ref_core")
+
+# Initialise the metrics manager and register the example metric
+provider = MetricsProvider("example", __version__)
+provider.register(ExampleMetric())
diff --git a/packages/ref-metrics-example/src/ref_metrics_example/example.py b/packages/ref-metrics-example/src/ref_metrics_example/example.py
new file mode 100644
index 0000000..0e378c8
--- /dev/null
+++ b/packages/ref-metrics-example/src/ref_metrics_example/example.py
@@ -0,0 +1,115 @@
+from pathlib import Path
+from typing import Any
+
+import xarray as xr
+from ref_core.metrics import Configuration, MetricResult, TriggerInfo
+
+
+def calculate_annual_mean_timeseries(dataset: Path) -> xr.Dataset:
+    """
+    Calculate the annual mean timeseries for a dataset.
+
+    While this function is implemented here,
+    in most cases the metric calculation will be in the underlying benchmarking package.
+    How the metric is calculated is up to the provider.
+
+    Parameters
+    ----------
+    dataset
+        A path to a CMIP6 dataset.
+
+        This dataset may consist of multiple data files.
+
+    Returns
+    -------
+    :
+        The annual mean timeseries of the dataset
+    """
+    input_files = dataset.glob("*.nc")
+
+    xr_ds = xr.open_mfdataset(list(input_files), combine="by_coords", chunks=None, use_cftime=True)
+
+    annual_mean = xr_ds.resample(time="YS").mean()
+    return annual_mean.mean(dim=["lat", "lon"], keep_attrs=True)
+
+
+def format_cmec_output_bundle(dataset: xr.Dataset) -> dict[str, Any]:
+    """
+    Create a simple CMEC output bundle for the dataset.
+
+    Parameters
+    ----------
+    dataset
+        Processed dataset
+
+    Returns
+    -------
+        A CMEC output bundle ready to be written to disk
+    """
+    # TODO: Check how timeseries data are generally serialised
+    cmec_output = {
+        "DIMENSIONS": {
+            "dimensions": {
+                "source_id": {dataset.attrs["source_id"]: {}},
+                "region": {"global": {}},
+                "variable": {"tas": {}},
+            },
+            "json_structure": [
+                "model",
+                "region",
+                "statistic",
+            ],
+        },
+        # Is the schema tracked?
+        "SCHEMA": {
+            "name": "CMEC-REF",
+            "package": "example",
+            "version": "v1",
+        },
+        "RESULTS": {
+            dataset.attrs["source_id"]: {"global": {"tas": ""}},
+        },
+    }
+
+    return cmec_output
+
+
+class ExampleMetric:
+    """
+    Calculate the annual mean global mean timeseries for a dataset
+    """
+
+    name = "example"
+
+    def run(self, configuration: Configuration, trigger: TriggerInfo | None) -> MetricResult:
+        """
+        Run a metric
+
+        Parameters
+        ----------
+        trigger
+            Trigger for what caused the metric to be executed.
+
+        configuration
+            Configuration object
+
+        Returns
+        -------
+        :
+            The result of running the metric.
+        """
+        if trigger is None:
+            # TODO: This should probably raise an exception
+            return MetricResult(
+                output_bundle=configuration.output_directory / "output.json",
+                successful=False,
+            )
+
+        # This is where one would hook into how ever they want to run
+        # their benchmarking packages.
+        # cmec-driver, python calls, subprocess calls all would work
+        annual_mean_global_mean_timeseries = calculate_annual_mean_timeseries(trigger.dataset)
+
+        return MetricResult.build(
+            configuration, format_cmec_output_bundle(annual_mean_global_mean_timeseries)
+        )
diff --git a/packages/ref-metrics-example/tests/unit/test_metrics.py b/packages/ref-metrics-example/tests/unit/test_metrics.py
new file mode 100644
index 0000000..d9f245f
--- /dev/null
+++ b/packages/ref-metrics-example/tests/unit/test_metrics.py
@@ -0,0 +1,54 @@
+from pathlib import Path
+
+import pytest
+from ref_core.metrics import Configuration, TriggerInfo
+from ref_metrics_example.example import ExampleMetric, calculate_annual_mean_timeseries
+
+
+@pytest.fixture
+def test_dataset(esgf_data_dir) -> Path:
+    return (
+        esgf_data_dir
+        / "CMIP6"
+        / "ScenarioMIP"
+        / "CSIRO"
+        / "ACCESS-ESM1-5"
+        / "ssp126"
+        / "r1i1p1f1"
+        / "Amon"
+        / "tas"
+        / "gn"
+        / "v20210318"
+    )
+
+
+def test_annual_mean(esgf_data_dir, test_dataset):
+    annual_mean = calculate_annual_mean_timeseries(test_dataset)
+
+    assert annual_mean.time.size == 286
+
+
+def test_example_metric(tmp_path, test_dataset):
+    metric = ExampleMetric()
+
+    configuration = Configuration(
+        output_directory=tmp_path,
+    )
+
+    result = metric.run(configuration, trigger=TriggerInfo(dataset=test_dataset))
+
+    assert result.successful
+    assert result.output_bundle.exists()
+    assert result.output_bundle.is_file()
+    assert result.output_bundle.name == "output.json"
+
+
+def test_example_metric_no_trigger(tmp_path, test_dataset):
+    metric = ExampleMetric()
+
+    configuration = Configuration(
+        output_directory=tmp_path,
+    )
+
+    result = metric.run(configuration, trigger=None)
+    assert result.successful is False
diff --git a/packages/ref-metrics-example/tests/unit/test_provider.py b/packages/ref-metrics-example/tests/unit/test_provider.py
new file mode 100644
index 0000000..5de9e74
--- /dev/null
+++ b/packages/ref-metrics-example/tests/unit/test_provider.py
@@ -0,0 +1,14 @@
+from ref_metrics_example import __core_version__, __version__, provider
+
+
+# Placeholder to get CI working
+def test_version():
+    assert __version__ == "0.1.0"
+    assert __core_version__ == "0.1.0"
+
+
+def test_provider():
+    assert provider.name == "example"
+    assert provider.version == __version__
+
+    assert len(provider) == 1
diff --git a/packages/ref-metrics-example/tests/unit/test_version.py b/packages/ref-metrics-example/tests/unit/test_version.py
deleted file mode 100644
index 6a5f45c..0000000
--- a/packages/ref-metrics-example/tests/unit/test_version.py
+++ /dev/null
@@ -1,8 +0,0 @@
-from ref_metrics_example import __core_version__ as core_version
-from ref_metrics_example import __version__ as version
-
-
-# Placeholder to get CI working
-def test_version():
-    assert version == "0.1.0"
-    assert core_version == "0.1.0"
diff --git a/scripts/fetch_test_data.py b/scripts/fetch_test_data.py
index 84d1d90..96e6737 100644
--- a/scripts/fetch_test_data.py
+++ b/scripts/fetch_test_data.py
@@ -67,7 +67,7 @@ def queue_esgf_download(  # noqa: PLR0913
         ]
     )
 
-    res = subprocess.run(
+    subprocess.run(
         [
             "esgpull",
             "update",
@@ -78,7 +78,6 @@ def queue_esgf_download(  # noqa: PLR0913
         input=b"y",
         check=False,
     )
-    res.check_returncode()
 
     return search_tag
 
diff --git a/uv.lock b/uv.lock
index c4a1ee2..92f65bc 100644
--- a/uv.lock
+++ b/uv.lock
@@ -1,5 +1,10 @@
 version = 1
 requires-python = ">=3.10"
+resolution-markers = [
+    "python_full_version < '3.11'",
+    "python_full_version == '3.11.*'",
+    "python_full_version >= '3.12'",
+]
 
 [manifest]
 members = [
@@ -279,6 +284,41 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/c5/55/51844dd50c4fc7a33b653bfaba4c2456f06955289ca770a5dbd5fd267374/cfgv-3.4.0-py2.py3-none-any.whl", hash = "sha256:b7265b1f29fd3316bfcd2b330d63d024f2bfd8bcb8b0272f8e19a504856c48f9", size = 7249 },
 ]
 
+[[package]]
+name = "cftime"
+version = "1.6.4.post1"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "numpy" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/ab/c8/1155d1d58003105307c7e5985f422ae5bcb2ca0cbc553cc828f3c5a934a7/cftime-1.6.4.post1.tar.gz", hash = "sha256:50ac76cc9f10ab7bd46e44a71c51a6927051b499b4407df4f29ab13d741b942f", size = 54631 }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/d9/6a/7ebd692ccf5b28d8c5e170fd11b0a2945f530392bc9887e858a0302b1745/cftime-1.6.4.post1-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:0baa9bc4850929da9f92c25329aa1f651e2d6f23e237504f337ee9e12a769f5d", size = 233017 },
+    { url = "https://files.pythonhosted.org/packages/b9/65/3b7a11139282f81ce40872acad7f99b65291f7401ceec7b6bb94c39c8441/cftime-1.6.4.post1-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:6bb6b087f4b2513c37670bccd457e2a666ca489c5f2aad6e2c0e94604dc1b5b9", size = 213927 },
+    { url = "https://files.pythonhosted.org/packages/70/e3/1a56832b13ce0c5f3b798bf7bc60d4550fa1c514e04b613f9b0e48edc535/cftime-1.6.4.post1-cp310-cp310-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:7d9bdeb9174962c9ca00015190bfd693de6b0ec3ec0b3dbc35c693a4f48efdcc", size = 1252052 },
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+    { url = "https://files.pythonhosted.org/packages/68/0f/95ce359a3bd91a8ec9b79d4961753053c72a5115e820a072d451568684c3/cftime-1.6.4.post1-cp310-cp310-win_amd64.whl", hash = "sha256:e60b8f24b20753f7548f410f7510e28b941f336f84bd34e3cfd7874af6e70281", size = 189078 },
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+    { url = "https://files.pythonhosted.org/packages/fa/08/335cb17f3b708f9a24f96ca4abb00889c7aa20b0ae273313e7c11faf1f97/cftime-1.6.4.post1-cp313-cp313-musllinux_1_2_x86_64.whl", hash = "sha256:6b731c7133d17b479ca0c3c46a7a04f96197f0a4d753f4c2284c3ff0447279b4", size = 1390156 },
+    { url = "https://files.pythonhosted.org/packages/f3/2d/980323fb5ec1ef369604b61ba259a41d0336cc1a85b639ed7bd210bd1290/cftime-1.6.4.post1-cp313-cp313-win_amd64.whl", hash = "sha256:d2a8c223faea7f1248ab469cc0d7795dd46f2a423789038f439fee7190bae259", size = 178496 },
+]
+
 [[package]]
 name = "charset-normalizer"
 version = "3.3.2"
@@ -359,6 +399,15 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/ca/c7/a04832e84f1c613194231a657612aee2e377d63a44a5847386c83c38bbd6/click_params-0.5.0-py3-none-any.whl", hash = "sha256:bbb2efe44197ab896bffcb50f42f22240fb077e6756b568fbdab3e1700b859d6", size = 13152 },
 ]
 
+[[package]]
+name = "cloudpickle"
+version = "3.1.0"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/97/c7/f746cadd08c4c08129215cf1b984b632f9e579fc781301e63da9e85c76c1/cloudpickle-3.1.0.tar.gz", hash = "sha256:81a929b6e3c7335c863c771d673d105f02efdb89dfaba0c90495d1c64796601b", size = 66155 }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/48/41/e1d85ca3cab0b674e277c8c4f678cf66a91cd2cecf93df94353a606fe0db/cloudpickle-3.1.0-py3-none-any.whl", hash = "sha256:fe11acda67f61aaaec473e3afe030feb131d78a43461b718185363384f1ba12e", size = 22021 },
+]
+
 [[package]]
 name = "cmip-ref"
 version = "0.1.0"
@@ -542,6 +591,25 @@ wheels = [
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+[[package]]
+name = "dask"
+version = "2024.11.2"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "click" },
+    { name = "cloudpickle" },
+    { name = "fsspec" },
+    { name = "importlib-metadata", marker = "python_full_version < '3.12'" },
+    { name = "packaging" },
+    { name = "partd" },
+    { name = "pyyaml" },
+    { name = "toolz" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/9d/a1/6d06c4cc93349377a9f318f2ebff5b637e6ffee373e38f363123b4b1afa7/dask-2024.11.2.tar.gz", hash = "sha256:9a72bee3f149ff89bc492340d4bcba33d5dd3e3a9d471d2b4b3872f2d71ddaae", size = 10688567 }
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+]
+
 [[package]]
 name = "debugpy"
 version = "1.8.6"
@@ -698,6 +766,15 @@ wheels = [
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+[[package]]
+name = "fsspec"
+version = "2024.10.0"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/a0/52/f16a068ebadae42526484c31f4398e62962504e5724a8ba5dc3409483df2/fsspec-2024.10.0.tar.gz", hash = "sha256:eda2d8a4116d4f2429db8550f2457da57279247dd930bb12f821b58391359493", size = 286853 }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/c6/b2/454d6e7f0158951d8a78c2e1eb4f69ae81beb8dca5fee9809c6c99e9d0d0/fsspec-2024.10.0-py3-none-any.whl", hash = "sha256:03b9a6785766a4de40368b88906366755e2819e758b83705c88cd7cb5fe81871", size = 179641 },
+]
+
 [[package]]
 name = "ghp-import"
 version = "2.1.0"
@@ -1202,6 +1279,15 @@ wheels = [
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 ]
 
+[[package]]
+name = "locket"
+version = "1.0.0"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/2f/83/97b29fe05cb6ae28d2dbd30b81e2e402a3eed5f460c26e9eaa5895ceacf5/locket-1.0.0.tar.gz", hash = "sha256:5c0d4c052a8bbbf750e056a8e65ccd309086f4f0f18a2eac306a8dfa4112a632", size = 4350 }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/db/bc/83e112abc66cd466c6b83f99118035867cecd41802f8d044638aa78a106e/locket-1.0.0-py2.py3-none-any.whl", hash = "sha256:b6c819a722f7b6bd955b80781788e4a66a55628b858d347536b7e81325a3a5e3", size = 4398 },
+]
+
 [[package]]
 name = "loguru"
 version = "0.7.2"
@@ -1685,6 +1771,39 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/a0/c4/c2971a3ba4c6103a3d10c4b0f24f461ddc027f0f09763220cf35ca1401b3/nest_asyncio-1.6.0-py3-none-any.whl", hash = "sha256:87af6efd6b5e897c81050477ef65c62e2b2f35d51703cae01aff2905b1852e1c", size = 5195 },
 ]
 
+[[package]]
+name = "netcdf4"
+version = "1.7.2"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "certifi" },
+    { name = "cftime" },
+    { name = "numpy" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/71/ed/4d27fcfa40ebfdad3d2088a3de7ee48dbff7f35163e815ec1870d2a7398c/netcdf4-1.7.2.tar.gz", hash = "sha256:a4c6375540b19989896136943abb6d44850ff6f1fa7d3f063253b1ad3f8b7fce", size = 835064 }
+wheels = [
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+    { url = "https://files.pythonhosted.org/packages/81/c2/a5001f25de53b7312609d2733ac887a5051c1ce196288af4b9777ead5a75/netCDF4-1.7.2-cp310-cp310-macosx_14_0_arm64.whl", hash = "sha256:118b476fd00d7e3ab9aa7771186d547da645ae3b49c0c7bdab866793ebf22f07", size = 2461128 },
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 dependencies = [
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+    { name = "xarray" },
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 [package.metadata]
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+    { name = "netcdf4" },
+    { name = "ref-core", editable = "packages/ref-core" },
+    { name = "xarray", specifier = ">=2022" },
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