diff --git a/cli/BUILD.bazel b/cli/BUILD.bazel
index 3baa3ce..a4ba362 100644
--- a/cli/BUILD.bazel
+++ b/cli/BUILD.bazel
@@ -1,9 +1,20 @@
 load("@rules_python//python:defs.bzl", "py_binary")
 load("@pip//:requirements.bzl", "requirement")
+load("//tools:py_header.bzl", "myorg_py_header")
+
+myorg_py_header(
+    name = "fill_template",
+    out = "header.txt",
+    tmpl = "header.txt.tmpl",
+)
 
 py_binary(
     name = "cli",
     srcs = ["__main__.py"],
     main = "__main__.py",
-    deps = [requirement("requests")],
+    deps = [
+        requirement("requests"),
+        requirement("bazel-runfiles"),
+    ],
+    data = ["header.txt"],
 )
diff --git a/cli/__main__.py b/cli/__main__.py
index 5c560bc..e3e4ca9 100644
--- a/cli/__main__.py
+++ b/cli/__main__.py
@@ -1,4 +1,7 @@
 import requests
+import runfiles
 
+with open(runfiles.Create().Rlocation("_main/cli/header.txt"), "r") as f:
+  print(f.read())
 r = requests.get('http://localhost:8081')
 print(r.json())
diff --git a/cli/header.txt.tmpl b/cli/header.txt.tmpl
new file mode 100644
index 0000000..b3a5ceb
--- /dev/null
+++ b/cli/header.txt.tmpl
@@ -0,0 +1,4 @@
+Thanks for running our <codename> CLI.
+
+Note, you will need to start the server first.
+Built at {{timestamp}}!
diff --git a/requirements.txt b/requirements.txt
index f229360..3c70bf5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1 +1,4 @@
 requests
+Jinja2
+jinja2-cli
+bazel-runfiles
diff --git a/requirements_lock.txt b/requirements_lock.txt
index 95df8ea..0a69e06 100644
--- a/requirements_lock.txt
+++ b/requirements_lock.txt
@@ -1,9 +1,12 @@
 #
-# This file is autogenerated by pip-compile with python 3.9
-# To update, run:
+# This file is autogenerated by pip-compile with Python 3.9
+# by the following command:
 #
 #    bazel run //:requirements.update
 #
+bazel-runfiles==0.27.1 \
+    --hash=sha256:89ae658e4e6e8714db99bea0e5a4c9c6b171316fc944968efd7502678910169a
+    # via -r requirements.txt
 certifi==2022.12.7 \
     --hash=sha256:35824b4c3a97115964b408844d64aa14db1cc518f6562e8d7261699d1350a9e3 \
     --hash=sha256:4ad3232f5e926d6718ec31cfc1fcadfde020920e278684144551c91769c7bc18
@@ -16,10 +19,82 @@ idna==3.4 \
     --hash=sha256:814f528e8dead7d329833b91c5faa87d60bf71824cd12a7530b5526063d02cb4 \
     --hash=sha256:90b77e79eaa3eba6de819a0c442c0b4ceefc341a7a2ab77d7562bf49f425c5c2
     # via requests
+jinja2==3.1.2 \
+    --hash=sha256:31351a702a408a9e7595a8fc6150fc3f43bb6bf7e319770cbc0db9df9437e852 \
+    --hash=sha256:6088930bfe239f0e6710546ab9c19c9ef35e29792895fed6e6e31a023a182a61
+    # via
+    #   -r requirements.txt
+    #   jinja2-cli
+jinja2-cli==0.8.2 \
+    --hash=sha256:a16bb1454111128e206f568c95938cdef5b5a139929378f72bb8cf6179e18e50 \
+    --hash=sha256:b91715c79496beaddad790171e7258a87db21c1a0b6d2b15bca3ba44b74aac5d
+    # via -r requirements.txt
+markupsafe==2.1.3 \
+    --hash=sha256:05fb21170423db021895e1ea1e1f3ab3adb85d1c2333cbc2310f2a26bc77272e \
+    --hash=sha256:0a4e4a1aff6c7ac4cd55792abf96c915634c2b97e3cc1c7129578aa68ebd754e \
+    --hash=sha256:10bbfe99883db80bdbaff2dcf681dfc6533a614f700da1287707e8a5d78a8431 \
+    --hash=sha256:134da1eca9ec0ae528110ccc9e48041e0828d79f24121a1a146161103c76e686 \
+    --hash=sha256:14ff806850827afd6b07a5f32bd917fb7f45b046ba40c57abdb636674a8b559c \
+    --hash=sha256:1577735524cdad32f9f694208aa75e422adba74f1baee7551620e43a3141f559 \
+    --hash=sha256:1b40069d487e7edb2676d3fbdb2b0829ffa2cd63a2ec26c4938b2d34391b4ecc \
+    --hash=sha256:1b8dd8c3fd14349433c79fa8abeb573a55fc0fdd769133baac1f5e07abf54aeb \
+    --hash=sha256:1f67c7038d560d92149c060157d623c542173016c4babc0c1913cca0564b9939 \
+    --hash=sha256:282c2cb35b5b673bbcadb33a585408104df04f14b2d9b01d4c345a3b92861c2c \
+    --hash=sha256:2c1b19b3aaacc6e57b7e25710ff571c24d6c3613a45e905b1fde04d691b98ee0 \
+    --hash=sha256:2ef12179d3a291be237280175b542c07a36e7f60718296278d8593d21ca937d4 \
+    --hash=sha256:338ae27d6b8745585f87218a3f23f1512dbf52c26c28e322dbe54bcede54ccb9 \
+    --hash=sha256:3c0fae6c3be832a0a0473ac912810b2877c8cb9d76ca48de1ed31e1c68386575 \
+    --hash=sha256:3fd4abcb888d15a94f32b75d8fd18ee162ca0c064f35b11134be77050296d6ba \
+    --hash=sha256:42de32b22b6b804f42c5d98be4f7e5e977ecdd9ee9b660fda1a3edf03b11792d \
+    --hash=sha256:47d4f1c5f80fc62fdd7777d0d40a2e9dda0a05883ab11374334f6c4de38adffd \
+    --hash=sha256:504b320cd4b7eff6f968eddf81127112db685e81f7e36e75f9f84f0df46041c3 \
+    --hash=sha256:525808b8019e36eb524b8c68acdd63a37e75714eac50e988180b169d64480a00 \
+    --hash=sha256:56d9f2ecac662ca1611d183feb03a3fa4406469dafe241673d521dd5ae92a155 \
+    --hash=sha256:5bbe06f8eeafd38e5d0a4894ffec89378b6c6a625ff57e3028921f8ff59318ac \
+    --hash=sha256:65c1a9bcdadc6c28eecee2c119465aebff8f7a584dd719facdd9e825ec61ab52 \
+    --hash=sha256:68e78619a61ecf91e76aa3e6e8e33fc4894a2bebe93410754bd28fce0a8a4f9f \
+    --hash=sha256:69c0f17e9f5a7afdf2cc9fb2d1ce6aabdb3bafb7f38017c0b77862bcec2bbad8 \
+    --hash=sha256:6b2b56950d93e41f33b4223ead100ea0fe11f8e6ee5f641eb753ce4b77a7042b \
+    --hash=sha256:715d3562f79d540f251b99ebd6d8baa547118974341db04f5ad06d5ea3eb8007 \
+    --hash=sha256:787003c0ddb00500e49a10f2844fac87aa6ce977b90b0feaaf9de23c22508b24 \
+    --hash=sha256:7ef3cb2ebbf91e330e3bb937efada0edd9003683db6b57bb108c4001f37a02ea \
+    --hash=sha256:8023faf4e01efadfa183e863fefde0046de576c6f14659e8782065bcece22198 \
+    --hash=sha256:8758846a7e80910096950b67071243da3e5a20ed2546e6392603c096778d48e0 \
+    --hash=sha256:8afafd99945ead6e075b973fefa56379c5b5c53fd8937dad92c662da5d8fd5ee \
+    --hash=sha256:8c41976a29d078bb235fea9b2ecd3da465df42a562910f9022f1a03107bd02be \
+    --hash=sha256:8e254ae696c88d98da6555f5ace2279cf7cd5b3f52be2b5cf97feafe883b58d2 \
+    --hash=sha256:8f9293864fe09b8149f0cc42ce56e3f0e54de883a9de90cd427f191c346eb2e1 \
+    --hash=sha256:9402b03f1a1b4dc4c19845e5c749e3ab82d5078d16a2a4c2cd2df62d57bb0707 \
+    --hash=sha256:962f82a3086483f5e5f64dbad880d31038b698494799b097bc59c2edf392fce6 \
+    --hash=sha256:9aad3c1755095ce347e26488214ef77e0485a3c34a50c5a5e2471dff60b9dd9c \
+    --hash=sha256:9dcdfd0eaf283af041973bff14a2e143b8bd64e069f4c383416ecd79a81aab58 \
+    --hash=sha256:aa57bd9cf8ae831a362185ee444e15a93ecb2e344c8e52e4d721ea3ab6ef1823 \
+    --hash=sha256:aa7bd130efab1c280bed0f45501b7c8795f9fdbeb02e965371bbef3523627779 \
+    --hash=sha256:ab4a0df41e7c16a1392727727e7998a467472d0ad65f3ad5e6e765015df08636 \
+    --hash=sha256:ad9e82fb8f09ade1c3e1b996a6337afac2b8b9e365f926f5a61aacc71adc5b3c \
+    --hash=sha256:af598ed32d6ae86f1b747b82783958b1a4ab8f617b06fe68795c7f026abbdcad \
+    --hash=sha256:b076b6226fb84157e3f7c971a47ff3a679d837cf338547532ab866c57930dbee \
+    --hash=sha256:b7ff0f54cb4ff66dd38bebd335a38e2c22c41a8ee45aa608efc890ac3e3931bc \
+    --hash=sha256:bfce63a9e7834b12b87c64d6b155fdd9b3b96191b6bd334bf37db7ff1fe457f2 \
+    --hash=sha256:c011a4149cfbcf9f03994ec2edffcb8b1dc2d2aede7ca243746df97a5d41ce48 \
+    --hash=sha256:c9c804664ebe8f83a211cace637506669e7890fec1b4195b505c214e50dd4eb7 \
+    --hash=sha256:ca379055a47383d02a5400cb0d110cef0a776fc644cda797db0c5696cfd7e18e \
+    --hash=sha256:cb0932dc158471523c9637e807d9bfb93e06a95cbf010f1a38b98623b929ef2b \
+    --hash=sha256:cd0f502fe016460680cd20aaa5a76d241d6f35a1c3350c474bac1273803893fa \
+    --hash=sha256:ceb01949af7121f9fc39f7d27f91be8546f3fb112c608bc4029aef0bab86a2a5 \
+    --hash=sha256:d080e0a5eb2529460b30190fcfcc4199bd7f827663f858a226a81bc27beaa97e \
+    --hash=sha256:dd15ff04ffd7e05ffcb7fe79f1b98041b8ea30ae9234aed2a9168b5797c3effb \
+    --hash=sha256:df0be2b576a7abbf737b1575f048c23fb1d769f267ec4358296f31c2479db8f9 \
+    --hash=sha256:e09031c87a1e51556fdcb46e5bd4f59dfb743061cf93c4d6831bf894f125eb57 \
+    --hash=sha256:e4dd52d80b8c83fdce44e12478ad2e85c64ea965e75d66dbeafb0a3e77308fcc \
+    --hash=sha256:f698de3fd0c4e6972b92290a45bd9b1536bffe8c6759c62471efaa8acb4c37bc \
+    --hash=sha256:fec21693218efe39aa7f8599346e90c705afa52c5b31ae019b2e57e8f6542bb2 \
+    --hash=sha256:ffcc3f7c66b5f5b7931a5aa68fc9cecc51e685ef90282f4a82f0f5e9b704ad11
+    # via jinja2
 requests==2.28.1 \
     --hash=sha256:7c5599b102feddaa661c826c56ab4fee28bfd17f5abca1ebbe3e7f19d7c97983 \
     --hash=sha256:8fefa2a1a1365bf5520aac41836fbee479da67864514bdb821f31ce07ce65349
-    # via -r ./requirements.txt
+    # via -r requirements.txt
 urllib3==1.26.13 \
     --hash=sha256:47cc05d99aaa09c9e72ed5809b60e7ba354e64b59c9c173ac3018642d8bb41fc \
     --hash=sha256:c083dd0dce68dbfbe1129d5271cb90f9447dea7d52097c6e0126120c521ddea8
diff --git a/tools/BUILD.bazel b/tools/BUILD.bazel
new file mode 100644
index 0000000..a227521
--- /dev/null
+++ b/tools/BUILD.bazel
@@ -0,0 +1,21 @@
+load("@rules_python//python/entry_points:py_console_script_binary.bzl", "py_console_script_binary")
+
+package(default_visibility = ["//visibility:public"])
+py_console_script_binary(
+    name = "jinja2",
+    pkg = "@pip//jinja2_cli:pkg",
+)
+
+load("@aspect_bazel_lib//lib:jq.bzl", "jq")
+
+jq(
+    name = "data",
+    srcs = [],
+    filter = "|".join([
+        # Don't directly reference $STAMP as it's only set when stamping
+        # This 'as' syntax results in $stamp being null in unstamped builds.
+        "$ARGS.named.STAMP as $stamp",
+        # Provide a default using the "alternative operator" in case $stamp is null.
+        """.timestamp = ($stamp.BUILD_TIMESTAMP // "<unstamped>")""",
+    ]),
+)
diff --git a/tools/py_header.bzl b/tools/py_header.bzl
new file mode 100644
index 0000000..98a7335
--- /dev/null
+++ b/tools/py_header.bzl
@@ -0,0 +1,16 @@
+"TODO"
+load("@aspect_bazel_lib//lib:run_binary.bzl", "run_binary")
+
+def myorg_py_header(name, tmpl, out, **kwargs):
+    run_binary(
+        name = name,
+        outs = [out],
+        srcs = [
+            tmpl,
+            "//tools:data.json",
+        ],
+        # The tool to run in the action
+        tool = "//tools:jinja2",
+        args = ["--format=json", "-o", "$(execpath %s)" % out, "$(execpath %s)" % tmpl, "$(execpath //tools:data.json)"],
+        **kwargs,
+    )