diff --git a/README.md b/README.md
index 8076655..8a242d4 100644
--- a/README.md
+++ b/README.md
@@ -83,7 +83,7 @@ temperatures, etc. See [Langchain's API ref](https://api.python.langchain.com/en
 Note! This is a confusing use case -- change it to something relevant to your work.
 
 ```yaml
-task: | 
+task: |
   Create a hello world notebook 'x.ipynb', use nbmake's NotebookRun class to test it from a Python application
 steps:
   - Create a hello world notebook using nbformat
@@ -132,3 +132,6 @@ using Phoenix.
     ```
 1. In another termianl, run nbwrite with the following var set: `export NBWRITE_PHOENIX_TRACE=1`
 1. Check the phoenix traces in the dashboard (default http://127.0.0.1:6060/)
+
+
+## TODO make phoenix optional, fix empty packages bug
\ No newline at end of file
diff --git a/poetry.lock b/poetry.lock
index 8572194..f8472e7 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -207,7 +207,7 @@ files = [
 name = "arize-phoenix"
 version = "0.0.49"
 description = "ML Observability in your notebook"
-optional = false
+optional = true
 python-versions = "<3.12,>=3.8"
 files = [
     {file = "arize_phoenix-0.0.49-py3-none-any.whl", hash = "sha256:8f01bb60c5cb47f891e930268142f3cba3905bcfaace5d3304015fd67ab509fa"},
@@ -259,7 +259,7 @@ test = ["astroid", "pytest"]
 name = "astunparse"
 version = "1.6.3"
 description = "An AST unparser for Python"
-optional = false
+optional = true
 python-versions = "*"
 files = [
     {file = "astunparse-1.6.3-py2.py3-none-any.whl", hash = "sha256:c2652417f2c8b5bb325c885ae329bdf3f86424075c4fd1a128674bc6fba4b8e8"},
@@ -314,7 +314,7 @@ files = [
 name = "backoff"
 version = "2.2.1"
 description = "Function decoration for backoff and retry"
-optional = false
+optional = true
 python-versions = ">=3.7,<4.0"
 files = [
     {file = "backoff-2.2.1-py3-none-any.whl", hash = "sha256:63579f9a0628e06278f7e47b7d7d5b6ce20dc65c5e96a6f3ca99a6adca0396e8"},
@@ -325,7 +325,7 @@ files = [
 name = "bcrypt"
 version = "4.0.1"
 description = "Modern password hashing for your software and your servers"
-optional = false
+optional = true
 python-versions = ">=3.6"
 files = [
     {file = "bcrypt-4.0.1-cp36-abi3-macosx_10_10_universal2.whl", hash = "sha256:b1023030aec778185a6c16cf70f359cbb6e0c289fd564a7cfa29e727a1c38f8f"},
@@ -544,7 +544,7 @@ files = [
 name = "chroma-hnswlib"
 version = "0.7.3"
 description = "Chromas fork of hnswlib"
-optional = false
+optional = true
 python-versions = "*"
 files = [
     {file = "chroma-hnswlib-0.7.3.tar.gz", hash = "sha256:b6137bedde49fffda6af93b0297fe00429fc61e5a072b1ed9377f909ed95a932"},
@@ -581,7 +581,7 @@ numpy = "*"
 name = "chromadb"
 version = "0.4.14"
 description = "Chroma."
-optional = false
+optional = true
 python-versions = ">=3.7"
 files = [
     {file = "chromadb-0.4.14-py3-none-any.whl", hash = "sha256:c1b59bdfb4b35a40bad0b8927c5ed757adf191ff9db2b9a384dc46a76e1ff10f"},
@@ -638,7 +638,7 @@ files = [
 name = "coloredlogs"
 version = "15.0.1"
 description = "Colored terminal output for Python's logging module"
-optional = false
+optional = true
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 files = [
     {file = "coloredlogs-15.0.1-py2.py3-none-any.whl", hash = "sha256:612ee75c546f53e92e70049c9dbfcc18c935a2b9a53b66085ce9ef6a6e5c0934"},
@@ -807,34 +807,34 @@ toml = ["tomli"]
 
 [[package]]
 name = "cryptography"
-version = "41.0.4"
+version = "41.0.5"
 description = "cryptography is a package which provides cryptographic recipes and primitives to Python developers."
 optional = false
 python-versions = ">=3.7"
 files = [
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-    {file = "cryptography-41.0.4-cp37-abi3-macosx_10_12_x86_64.whl", hash = "sha256:35c00f637cd0b9d5b6c6bd11b6c3359194a8eba9c46d4e875a3660e3b400005f"},
-    {file = "cryptography-41.0.4-cp37-abi3-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:cecfefa17042941f94ab54f769c8ce0fe14beff2694e9ac684176a2535bf9714"},
-    {file = "cryptography-41.0.4-cp37-abi3-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:e40211b4923ba5a6dc9769eab704bdb3fbb58d56c5b336d30996c24fcf12aadb"},
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+    {file = "cryptography-41.0.5.tar.gz", hash = "sha256:392cb88b597247177172e02da6b7a63deeff1937fa6fec3bbf902ebd75d97ec7"},
 ]
 
 [package.dependencies]
@@ -869,7 +869,7 @@ tests = ["pytest", "pytest-cov", "pytest-xdist"]
 name = "cython"
 version = "0.29.36"
 description = "The Cython compiler for writing C extensions for the Python language."
-optional = false
+optional = true
 python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
 files = [
     {file = "Cython-0.29.36-cp27-cp27m-manylinux_2_5_i686.manylinux1_i686.whl", hash = "sha256:1ea33c1c57f331f5653baa1313e445fbe80d1da56dd9a42c8611037887897b9d"},
@@ -934,7 +934,7 @@ typing-inspect = ">=0.4.0,<1"
 name = "ddsketch"
 version = "2.0.4"
 description = "Distributed quantile sketches"
-optional = false
+optional = true
 python-versions = ">=2.7"
 files = [
     {file = "ddsketch-2.0.4-py3-none-any.whl", hash = "sha256:3227a270fd686a29d3a7128f9352ccf852314410380fc11384356f1ae2a75938"},
@@ -1122,7 +1122,7 @@ typing = ["typing-extensions (>=4.7.1)"]
 name = "flatbuffers"
 version = "23.5.26"
 description = "The FlatBuffers serialization format for Python"
-optional = false
+optional = true
 python-versions = "*"
 files = [
     {file = "flatbuffers-23.5.26-py2.py3-none-any.whl", hash = "sha256:c0ff356da363087b915fde4b8b45bdda73432fc17cddb3c8157472eab1422ad1"},
@@ -1364,7 +1364,7 @@ websockets = ">=10.0,<12.0"
 name = "graphlib-backport"
 version = "1.0.3"
 description = "Backport of the Python 3.9 graphlib module for Python 3.6+"
-optional = false
+optional = true
 python-versions = ">=3.6,<4.0"
 files = [
     {file = "graphlib_backport-1.0.3-py3-none-any.whl", hash = "sha256:24246967b9e7e6a91550bc770e6169585d35aa32790258579a8a3899a8c18fde"},
@@ -1375,7 +1375,7 @@ files = [
 name = "graphql-core"
 version = "3.2.3"
 description = "GraphQL implementation for Python, a port of GraphQL.js, the JavaScript reference implementation for GraphQL."
-optional = false
+optional = true
 python-versions = ">=3.6,<4"
 files = [
     {file = "graphql-core-3.2.3.tar.gz", hash = "sha256:06d2aad0ac723e35b1cb47885d3e5c45e956a53bc1b209a9fc5369007fe46676"},
@@ -1461,7 +1461,7 @@ test = ["objgraph", "psutil"]
 name = "grpcio"
 version = "1.59.0"
 description = "HTTP/2-based RPC framework"
-optional = false
+optional = true
 python-versions = ">=3.7"
 files = [
     {file = "grpcio-1.59.0-cp310-cp310-linux_armv7l.whl", hash = "sha256:225e5fa61c35eeaebb4e7491cd2d768cd8eb6ed00f2664fa83a58f29418b39fd"},
@@ -1538,7 +1538,7 @@ files = [
 name = "hdbscan"
 version = "0.8.33"
 description = "Clustering based on density with variable density clusters"
-optional = false
+optional = true
 python-versions = "*"
 files = [
     {file = "hdbscan-0.8.33.tar.gz", hash = "sha256:57fabc5f0e45f48d2407b35c731192abc896376411fe7e4bb836ffa03d38f90d"},
@@ -1576,7 +1576,7 @@ socks = ["socksio (==1.*)"]
 name = "httptools"
 version = "0.6.1"
 description = "A collection of framework independent HTTP protocol utils."
-optional = false
+optional = true
 python-versions = ">=3.8.0"
 files = [
     {file = "httptools-0.6.1-cp310-cp310-macosx_10_9_universal2.whl", hash = "sha256:d2f6c3c4cb1948d912538217838f6e9960bc4a521d7f9b323b3da579cd14532f"},
@@ -1680,7 +1680,7 @@ typing = ["pydantic (<2.0)", "types-PyYAML", "types-requests", "types-simplejson
 name = "humanfriendly"
 version = "10.0"
 description = "Human friendly output for text interfaces using Python"
-optional = false
+optional = true
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 files = [
     {file = "humanfriendly-10.0-py2.py3-none-any.whl", hash = "sha256:1697e1a8a8f550fd43c2865cd84542fc175a61dcb779b6fee18cf6b6ccba1477"},
@@ -2219,7 +2219,7 @@ requests = ">=2,<3"
 name = "llvmlite"
 version = "0.41.1"
 description = "lightweight wrapper around basic LLVM functionality"
-optional = false
+optional = true
 python-versions = ">=3.8"
 files = [
     {file = "llvmlite-0.41.1-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:c1e1029d47ee66d3a0c4d6088641882f75b93db82bd0e6178f7bd744ebce42b9"},
@@ -2459,7 +2459,7 @@ files = [
 name = "monotonic"
 version = "1.6"
 description = "An implementation of time.monotonic() for Python 2 & < 3.3"
-optional = false
+optional = true
 python-versions = "*"
 files = [
     {file = "monotonic-1.6-py2.py3-none-any.whl", hash = "sha256:68687e19a14f11f26d140dd5c86f3dba4bf5df58003000ed467e0e2a69bca96c"},
@@ -2481,7 +2481,7 @@ files = [
 name = "mpmath"
 version = "1.3.0"
 description = "Python library for arbitrary-precision floating-point arithmetic"
-optional = false
+optional = true
 python-versions = "*"
 files = [
     {file = "mpmath-1.3.0-py3-none-any.whl", hash = "sha256:a0b2b9fe80bbcd81a6647ff13108738cfb482d481d826cc0e02f5b35e5c88d2c"},
@@ -2702,7 +2702,7 @@ setuptools = "*"
 name = "numba"
 version = "0.58.1"
 description = "compiling Python code using LLVM"
-optional = false
+optional = true
 python-versions = ">=3.8"
 files = [
     {file = "numba-0.58.1-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:07f2fa7e7144aa6f275f27260e73ce0d808d3c62b30cff8906ad1dec12d87bbe"},
@@ -2774,7 +2774,7 @@ files = [
 name = "onnxruntime"
 version = "1.16.1"
 description = "ONNX Runtime is a runtime accelerator for Machine Learning models"
-optional = false
+optional = true
 python-versions = "*"
 files = [
     {file = "onnxruntime-1.16.1-cp310-cp310-macosx_10_15_x86_64.whl", hash = "sha256:28b2c7f444b4119950b69370801cd66067f403d19cbaf2a444735d7c269cce4a"},
@@ -2919,7 +2919,7 @@ files = [
 name = "overrides"
 version = "7.4.0"
 description = "A decorator to automatically detect mismatch when overriding a method."
-optional = false
+optional = true
 python-versions = ">=3.6"
 files = [
     {file = "overrides-7.4.0-py3-none-any.whl", hash = "sha256:3ad24583f86d6d7a49049695efe9933e67ba62f0c7625d53c59fa832ce4b8b7d"},
@@ -2974,8 +2974,8 @@ files = [
 [package.dependencies]
 numpy = [
     {version = ">=1.20.3", markers = "python_version < \"3.10\""},
-    {version = ">=1.23.2", markers = "python_version >= \"3.11\""},
     {version = ">=1.21.0", markers = "python_version >= \"3.10\" and python_version < \"3.11\""},
+    {version = ">=1.23.2", markers = "python_version >= \"3.11\""},
 ]
 python-dateutil = ">=2.8.2"
 pytz = ">=2020.1"
@@ -3211,7 +3211,7 @@ testing = ["pytest", "pytest-benchmark"]
 name = "posthog"
 version = "3.0.2"
 description = "Integrate PostHog into any python application."
-optional = false
+optional = true
 python-versions = "*"
 files = [
     {file = "posthog-3.0.2-py2.py3-none-any.whl", hash = "sha256:a8c0af6f2401fbe50f90e68c4143d0824b54e872de036b1c2f23b5abb39d88ce"},
@@ -3266,7 +3266,7 @@ wcwidth = "*"
 name = "protobuf"
 version = "4.24.4"
 description = ""
-optional = false
+optional = true
 python-versions = ">=3.7"
 files = [
     {file = "protobuf-4.24.4-cp310-abi3-win32.whl", hash = "sha256:ec9912d5cb6714a5710e28e592ee1093d68c5ebfeda61983b3f40331da0b1ebb"},
@@ -3327,7 +3327,7 @@ files = [
 name = "pulsar-client"
 version = "3.3.0"
 description = "Apache Pulsar Python client library"
-optional = false
+optional = true
 python-versions = "*"
 files = [
     {file = "pulsar_client-3.3.0-cp310-cp310-macosx_10_15_universal2.whl", hash = "sha256:c31afd3e67a044ff93177df89e08febf214cc965e95ede097d9fe8755af00e01"},
@@ -3399,7 +3399,7 @@ files = [
 name = "pyarrow"
 version = "13.0.0"
 description = "Python library for Apache Arrow"
-optional = false
+optional = true
 python-versions = ">=3.8"
 files = [
     {file = "pyarrow-13.0.0-cp310-cp310-macosx_10_14_x86_64.whl", hash = "sha256:1afcc2c33f31f6fb25c92d50a86b7a9f076d38acbcb6f9e74349636109550148"},
@@ -3613,7 +3613,7 @@ plugins = ["importlib-metadata"]
 name = "pynndescent"
 version = "0.5.10"
 description = "Nearest Neighbor Descent"
-optional = false
+optional = true
 python-versions = "*"
 files = [
     {file = "pynndescent-0.5.10.tar.gz", hash = "sha256:5d5dc683c03ef55fe3ddf693859720ca18f85c6e6e5bb0b4f14870278d5288ad"},
@@ -3644,7 +3644,7 @@ diagrams = ["jinja2", "railroad-diagrams"]
 name = "pypika"
 version = "0.48.9"
 description = "A SQL query builder API for Python"
-optional = false
+optional = true
 python-versions = "*"
 files = [
     {file = "PyPika-0.48.9.tar.gz", hash = "sha256:838836a61747e7c8380cd1b7ff638694b7a7335345d0f559b04b2cd832ad5378"},
@@ -3654,7 +3654,7 @@ files = [
 name = "pyreadline3"
 version = "3.4.1"
 description = "A python implementation of GNU readline."
-optional = false
+optional = true
 python-versions = "*"
 files = [
     {file = "pyreadline3-3.4.1-py3-none-any.whl", hash = "sha256:b0efb6516fd4fb07b45949053826a62fa4cb353db5be2bbb4a7aa1fdd1e345fb"},
@@ -3665,7 +3665,7 @@ files = [
 name = "pysqlite3-binary"
 version = "0.5.2.post1"
 description = "DB-API 2.0 interface for Sqlite 3.x"
-optional = false
+optional = true
 python-versions = "*"
 files = [
     {file = "pysqlite3_binary-0.5.2.post1-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:668e7853b9e3db5c23b32a57634f658db5008fa1781121d2554a103c34775fe8"},
@@ -4501,7 +4501,7 @@ files = [
 name = "sortedcontainers"
 version = "2.4.0"
 description = "Sorted Containers -- Sorted List, Sorted Dict, Sorted Set"
-optional = false
+optional = true
 python-versions = "*"
 files = [
     {file = "sortedcontainers-2.4.0-py2.py3-none-any.whl", hash = "sha256:a163dcaede0f1c021485e957a39245190e74249897e2ae4b2aa38595db237ee0"},
@@ -4635,7 +4635,7 @@ full = ["httpx (>=0.22.0)", "itsdangerous", "jinja2", "python-multipart", "pyyam
 name = "strawberry-graphql"
 version = "0.208.2"
 description = "A library for creating GraphQL APIs"
-optional = false
+optional = true
 python-versions = ">=3.8,<4.0"
 files = [
     {file = "strawberry_graphql-0.208.2-py3-none-any.whl", hash = "sha256:682a07bd9fe8691d145eb02e3ce8f65114f6c293184c659b31545f728351f813"},
@@ -4669,7 +4669,7 @@ starlite = ["starlite (>=1.48.0)"]
 name = "sympy"
 version = "1.12"
 description = "Computer algebra system (CAS) in Python"
-optional = false
+optional = true
 python-versions = ">=3.8"
 files = [
     {file = "sympy-1.12-py3-none-any.whl", hash = "sha256:c3588cd4295d0c0f603d0f2ae780587e64e2efeedb3521e46b9bb1d08d184fa5"},
@@ -4753,7 +4753,7 @@ blobfile = ["blobfile (>=2)"]
 name = "tokenizers"
 version = "0.13.3"
 description = "Fast and Customizable Tokenizers"
-optional = false
+optional = true
 python-versions = "*"
 files = [
     {file = "tokenizers-0.13.3-cp310-cp310-macosx_10_11_x86_64.whl", hash = "sha256:f3835c5be51de8c0a092058a4d4380cb9244fb34681fd0a295fbf0a52a5fdf33"},
@@ -4917,7 +4917,7 @@ urllib3 = ">=1.26.0"
 name = "typer"
 version = "0.9.0"
 description = "Typer, build great CLIs. Easy to code. Based on Python type hints."
-optional = false
+optional = true
 python-versions = ">=3.6"
 files = [
     {file = "typer-0.9.0-py3-none-any.whl", hash = "sha256:5d96d986a21493606a358cae4461bd8cdf83cbf33a5aa950ae629ca3b51467ee"},
@@ -4986,7 +4986,7 @@ files = [
 name = "umap-learn"
 version = "0.5.4"
 description = "Uniform Manifold Approximation and Projection"
-optional = false
+optional = true
 python-versions = "*"
 files = [
     {file = "umap-learn-0.5.4.tar.gz", hash = "sha256:8cb2fa20b2493f9adbff3bfa3b3e3787f6d67d1547e688ea2bdc272b37d89e18"},
@@ -5051,7 +5051,7 @@ standard = ["colorama (>=0.4)", "httptools (>=0.5.0)", "python-dotenv (>=0.13)",
 name = "uvloop"
 version = "0.19.0"
 description = "Fast implementation of asyncio event loop on top of libuv"
-optional = false
+optional = true
 python-versions = ">=3.8.0"
 files = [
     {file = "uvloop-0.19.0-cp310-cp310-macosx_10_9_universal2.whl", hash = "sha256:de4313d7f575474c8f5a12e163f6d89c0a878bc49219641d49e6f1444369a90e"},
@@ -5115,7 +5115,7 @@ test = ["covdefaults (>=2.3)", "coverage (>=7.2.7)", "coverage-enable-subprocess
 name = "watchfiles"
 version = "0.21.0"
 description = "Simple, modern and high performance file watching and code reload in python."
-optional = false
+optional = true
 python-versions = ">=3.8"
 files = [
     {file = "watchfiles-0.21.0-cp310-cp310-macosx_10_7_x86_64.whl", hash = "sha256:27b4035013f1ea49c6c0b42d983133b136637a527e48c132d368eb19bf1ac6aa"},
@@ -5292,7 +5292,7 @@ files = [
 name = "wheel"
 version = "0.41.2"
 description = "A built-package format for Python"
-optional = false
+optional = true
 python-versions = ">=3.7"
 files = [
     {file = "wheel-0.41.2-py3-none-any.whl", hash = "sha256:75909db2664838d015e3d9139004ee16711748a52c8f336b52882266540215d8"},
@@ -5306,7 +5306,7 @@ test = ["pytest (>=6.0.0)", "setuptools (>=65)"]
 name = "wrapt"
 version = "1.15.0"
 description = "Module for decorators, wrappers and monkey patching."
-optional = false
+optional = true
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
 files = [
     {file = "wrapt-1.15.0-cp27-cp27m-macosx_10_9_x86_64.whl", hash = "sha256:ca1cccf838cd28d5a0883b342474c630ac48cac5df0ee6eacc9c7290f76b11c1"},
@@ -5488,7 +5488,11 @@ files = [
 docs = ["furo", "jaraco.packaging (>=9.3)", "jaraco.tidelift (>=1.4)", "rst.linker (>=1.9)", "sphinx (<7.2.5)", "sphinx (>=3.5)", "sphinx-lint"]
 testing = ["big-O", "jaraco.functools", "jaraco.itertools", "more-itertools", "pytest (>=6)", "pytest-black (>=0.3.7)", "pytest-checkdocs (>=2.4)", "pytest-cov", "pytest-enabler (>=2.2)", "pytest-ignore-flaky", "pytest-mypy (>=0.9.1)", "pytest-ruff"]
 
+[extras]
+rag = ["chromadb", "pysqlite3-binary"]
+tracing = ["arize-phoenix"]
+
 [metadata]
 lock-version = "2.0"
 python-versions = ">=3.8.1,<3.12"
-content-hash = "a51e19df3eef79367e1f81e08eb8b2c0a07be48cc6255e505bffdc2e07b8a117"
+content-hash = "02c6869f8347d112fcca7de18309e25ab8a25b93d69ee91b5fd648925537eb33"
diff --git a/pyproject.toml b/pyproject.toml
index bf6e2db..60f687d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -16,18 +16,22 @@ nbwrite = "nbwrite.cli:cli"
 [tool.poetry.dependencies]
 pytest = ">=6.1.0"
 python = ">=3.8.1,<3.12"
-openai = {extras = ["embeddings"], version = "^0.28.1"}
+openai = {optional = true, extras = ["embeddings"], version = "^0.28.1"}
 pathlib = "^1.0.1"
 click = "^8.1.7"
-langchain = {optional = false, version = "^0.0.312", extras = ["openai"]}
+langchain = {version = "^0.0.312", extras = ["openai"]}
 nbformat = "^5.9.2"
-chromadb = "^0.4.14"
-pysqlite3-binary = {version = "^0.5.2", markers = "sys_platform == 'linux'"}
-arize-phoenix = {extras = ["experimental"], version = "^0.0.49"}
+chromadb = {optional = true, version = "^0.4.14"}
+pysqlite3-binary = {optional = true, version = "^0.5.2", markers = "sys_platform == 'linux'"}
+arize-phoenix = {optional = true, extras = ["experimental"], version = "^0.0.49"}
 python-dotenv = "^1.0.0"
 pyyaml = "^6.0.1"
 rich = "^13.6.0"
 
+[tool.poetry.extras]
+tracing = ["arize-phoenix"]
+rag = ["chromadb", "pysqlite3-binary", "openai"]
+
 [tool.poetry.dev-dependencies]
 pytest = "^7.1.0"
 pre-commit = "^2.8.2"
diff --git a/src/nbwrite/config.py b/src/nbwrite/config.py
index 9d46f83..87917b6 100644
--- a/src/nbwrite/config.py
+++ b/src/nbwrite/config.py
@@ -20,7 +20,7 @@ class GenerationConfig(BaseModel):
 
 class Config(BaseModel):
     task: str
-    steps: List[str]
-    packages: List[str]
-    out: str
-    generation: GenerationConfig
+    steps: List[str] = []
+    packages: List[str] = []
+    out: str = "nbwrite-out"
+    generation: GenerationConfig = GenerationConfig()
diff --git a/src/nbwrite/index.py b/src/nbwrite/index.py
index 57c634a..0abaf17 100644
--- a/src/nbwrite/index.py
+++ b/src/nbwrite/index.py
@@ -1,5 +1,4 @@
 import importlib.util
-import os
 import platform
 from pathlib import Path
 from typing import Any, Dict, List
@@ -10,13 +9,6 @@
 from langchain.text_splitter import Language, RecursiveCharacterTextSplitter
 from langchain.vectorstores import Chroma
 
-if platform.system() == "Linux":
-    # https://docs.trychroma.com/troubleshooting#sqlite
-    __import__("pysqlite3")
-    import sys
-
-    sys.modules["sqlite3"] = sys.modules.pop("pysqlite3")
-
 
 def get_embeddings():
     return OpenAIEmbeddings(disallowed_special=())
@@ -27,6 +19,12 @@ def create_index(
     retriever_kwargs: Dict[str, Any],
     text_splitter_kwargs: Dict[str, Any],
 ):
+    if platform.system() == "Linux":
+        # https://docs.trychroma.com/troubleshooting#sqlite
+        __import__("pysqlite3")
+        import sys
+
+        sys.modules["sqlite3"] = sys.modules.pop("pysqlite3")
 
     python_splitter = RecursiveCharacterTextSplitter.from_language(
         language=Language.PYTHON, **text_splitter_kwargs
diff --git a/src/nbwrite/writer.py b/src/nbwrite/writer.py
index b4ca469..6535e1b 100644
--- a/src/nbwrite/writer.py
+++ b/src/nbwrite/writer.py
@@ -15,7 +15,7 @@
 from langchain.schema import format_document
 from langchain.schema.messages import SystemMessage
 from langchain.schema.output_parser import StrOutputParser
-from langchain.schema.runnable import RunnableParallel
+from langchain.schema.runnable import RunnableLambda, RunnableParallel
 from nbformat.v4 import (
     new_code_cell,
     new_markdown_cell,
@@ -42,13 +42,19 @@ def gen(
 
     if os.getenv("NBWRITE_PHOENIX_TRACE"):
         click.echo("Enabling Phoenix Trace")
-        from phoenix.trace.langchain import (
-            LangChainInstrumentor,
-            OpenInferenceTracer,
-        )
-
-        tracer = OpenInferenceTracer()
-        LangChainInstrumentor(tracer).instrument()
+        try:
+            from phoenix.trace.langchain import (
+                LangChainInstrumentor,
+                OpenInferenceTracer,
+            )
+
+            tracer = OpenInferenceTracer()
+            LangChainInstrumentor(tracer).instrument()
+        except ModuleNotFoundError:
+            click.echo(
+                "In order to use Phoenix Tracing you must `pip install 'nbwrite[tracing]'"
+            )
+            exit(1)
 
     prompt = ChatPromptTemplate.from_messages(
         [
@@ -57,22 +63,26 @@ def gen(
         ]
     )
 
-    retriever = create_index(
-        config.packages,
-        config.generation.retriever_kwargs,
-        config.generation.text_splitter_kwargs,
-    )
-
-    def _combine_documents(
-        docs, document_prompt=PromptTemplate.from_template(template="{page_content}"), document_separator="\n\n"  # type: ignore
-    ):
-        doc_strings = [format_document(doc, document_prompt) for doc in docs]
-        return document_separator.join(doc_strings)
+    if len(config.packages) > 0:
+        try:
+            retriever = create_index(
+                config.packages,
+                config.generation.retriever_kwargs,
+                config.generation.text_splitter_kwargs,
+            )
+            context_chain = itemgetter("task") | retriever | _combine_documents
+        except ModuleNotFoundError:
+            click.echo(
+                "In order to use `packages`, you must `pip install 'nbwrite[rag]'`"
+            )
+            exit(1)
+    else:
+        context_chain = RunnableLambda(lambda _: "none")
 
     llm = get_llm(**config.generation.llm_kwargs) | StrOutputParser()
     chain = (
         {
-            "context": itemgetter("task") | retriever | _combine_documents,
+            "context": context_chain,
             "task": itemgetter("task"),
             "steps": itemgetter("steps"),
             "packages": itemgetter("packages"),
@@ -114,3 +124,10 @@ def _combine_documents(
             click.echo(f"Wrote notebook to {filename}")
         except Exception as e:
             logger.error(f"Error writing notebook (generation {generation}): {e}")
+
+
+def _combine_documents(
+    docs, document_prompt=PromptTemplate.from_template(template="{page_content}"), document_separator="\n\n"  # type: ignore
+):
+    doc_strings = [format_document(doc, document_prompt) for doc in docs]
+    return document_separator.join(doc_strings)
diff --git a/tests/resources/nbwrite-in/minimal.yaml b/tests/resources/nbwrite-in/minimal.yaml
new file mode 100644
index 0000000..15a4160
--- /dev/null
+++ b/tests/resources/nbwrite-in/minimal.yaml
@@ -0,0 +1,2 @@
+task: |
+  Plot the iris dataset using pandas
diff --git a/tests/test_cli.py b/tests/test_cli.py
index 8bfacf1..3d404a0 100644
--- a/tests/test_cli.py
+++ b/tests/test_cli.py
@@ -56,3 +56,33 @@ def test_cli(tmpdir: local):
                     assert "Hello, world!" in "".join(
                         output.text for output in cell.outputs
                     )
+
+
+def test_cli_minimal(tmpdir: local):
+
+    if os.getenv("NBWRITE_DEBUG_MODE"):
+        outdir = "test-debug-out"
+        [pp.unlink() for pp in Path(outdir).glob("*.ipynb")]
+    else:
+        outdir = str(tmpdir)
+    runner = CliRunner()
+    args = [
+        "tests/resources/nbwrite-in/minimal.yaml",
+        "--out",
+        outdir,
+    ]
+
+    shell_fmt = " \\\n  ".join(["nbwrite", *args])
+    logger.warn(f"Running\n{shell_fmt}")
+
+    with patch("nbwrite.writer.get_llm") as mock_get_llm:
+        mock_get_llm.return_value = FakeListLLM(
+            responses=["Code:\n```python\nprint('Hello, world!')\n```\n"]
+        )
+        result = runner.invoke(cli, args)
+
+        assert result.exit_code == 0
+
+        logger.warn(f"Checking outputs in {outdir}")
+        outputs = list(Path(outdir).glob("*.ipynb"))
+        assert len(outputs) == 2