diff --git a/.github/workflows/testpr.yaml b/.github/workflows/testpr.yaml
index c93483fdf..c7c2f6122 100644
--- a/.github/workflows/testpr.yaml
+++ b/.github/workflows/testpr.yaml
@@ -154,8 +154,9 @@ jobs:
       PLATFORM: ${{ matrix.target.platform }}
       # while uploads go to a test channel, packages already there aren't built again
       ROBOSTACK_UPLOAD_CHANNEL: ${{ vars.ROBOSTACK_UPLOAD_CHANNEL }}
-      # rattler-build writes to distros/<d>/work/output, or to CONDA_BLD_PATH (win-64)
-      CACHE_DIR: ${{ matrix.target.platform == 'win-64' && 'D:/bld/win-64' || format('distros/{0}/work/output/{1}', matrix.distro, matrix.target.platform) }}
+      # rattler-build writes to distros/<d>/work/output, or to CONDA_BLD_PATH (win-64); its
+      # <platform>/ and noarch/ (e.g. the compatibility packages) are the build cache
+      OUTPUT_DIR: ${{ matrix.target.platform == 'win-64' && 'D:/bld' || format('distros/{0}/work/output', matrix.distro) }}
     steps:
     - uses: actions/checkout@v6
       with:
@@ -226,7 +227,9 @@ jobs:
     - name: Restore build cache
       uses: actions/cache/restore@v5
       with:
-        path: ${{ env.CACHE_DIR }}
+        path: |
+          ${{ env.OUTPUT_DIR }}/${{ matrix.target.platform }}
+          ${{ env.OUTPUT_DIR }}/noarch
         key: ${{ runner.os }}-${{ matrix.distro }}-${{ matrix.target.platform }}-pr-${{ github.event.pull_request.number }}
         restore-keys: |
           ${{ runner.os }}-${{ matrix.distro }}-${{ matrix.target.platform }}-pr-${{ github.event.pull_request.number }}-
@@ -235,21 +238,21 @@ jobs:
     - name: Apply ci.yaml cache controls
       shell: bash -l {0}
       run: |
-        pixi run python tools/ci_config.py --cache-dir "$CACHE_DIR" --config "distros/$DISTRO/ci.yaml" --vinca "distros/$DISTRO/vinca.yaml"
-        mkdir -p "$CACHE_DIR"
-        pixi run rattler-index fs "$CACHE_DIR/.." --force
+        pixi run python tools/ci_config.py --output-dir "$OUTPUT_DIR" --platform "$PLATFORM" --config "distros/$DISTRO/ci.yaml" --vinca "distros/$DISTRO/vinca.yaml"
+        mkdir -p "$OUTPUT_DIR/$PLATFORM"
+        pixi run rattler-index fs "$OUTPUT_DIR" --force
 
     - name: See packages restored by cache
       shell: bash -l {0}
       run: |
         shopt -s nullglob
-        packages=("$CACHE_DIR"/*.conda)
+        packages=("$OUTPUT_DIR/$PLATFORM"/*.conda "$OUTPUT_DIR"/noarch/*.conda)
         echo "${#packages[@]} packages restored from the cache"
         for package in "${packages[@]}"; do basename "$package"; done
 
     - name: Estimate the build time
       shell: bash -l {0}
-      run: pixi run python tools/ci_estimate.py --recipes "distros/$DISTRO/work/recipes" --cache-dir "$CACHE_DIR" --platform "$PLATFORM"
+      run: pixi run python tools/ci_estimate.py --recipes "distros/$DISTRO/work/recipes" --output-dir "$OUTPUT_DIR" --platform "$PLATFORM"
 
     - name: Build recipes
       id: build-recipes
@@ -266,7 +269,7 @@ jobs:
         [ "$PLATFORM" != "win-64" ] && extra+=(--parallel-builds "3:$(getconf _NPROCESSORS_ONLN)")
         build=(python tools/robostack.py "$DISTRO" build --target-platform "$PLATFORM" "${extra[@]}")
         if [ "$PLATFORM" != "win-64" ]; then
-          build=(python tools/ci_build.py --cache-dir "$CACHE_DIR" --timeout 19800 -- "${build[@]}")
+          build=(python tools/ci_build.py --output-dir "$OUTPUT_DIR" --platform "$PLATFORM" --timeout 19800 -- "${build[@]}")
         fi
         pixi run "${build[@]}" 2>&1 | tee rattler-build.log
         status=${PIPESTATUS[0]}
@@ -288,7 +291,7 @@ jobs:
       continue-on-error: true
       shell: bash -l {0}
       run: |
-        pixi run abi-check --distro "$DISTRO" --platform "$PLATFORM" --pr-builds "$CACHE_DIR" --summary "abi-check-$DISTRO.md"
+        pixi run abi-check --distro "$DISTRO" --platform "$PLATFORM" --pr-builds "$OUTPUT_DIR/$PLATFORM" --summary "abi-check-$DISTRO.md"
         cat "abi-check-$DISTRO.md" >> "$GITHUB_STEP_SUMMARY"
 
     - name: Upload the ABI check
@@ -313,7 +316,7 @@ jobs:
       if: ${{ always() && runner.os == 'Windows' && steps.build-recipes.outcome == 'cancelled' }}
       shell: bash -l {0}
       run: |
-        newest=$(ls -t "$CACHE_DIR"/*.conda 2>/dev/null | head -1)
+        newest=$(ls -t "$OUTPUT_DIR/$PLATFORM"/*.conda "$OUTPUT_DIR"/noarch/*.conda 2>/dev/null | head -1)
         if [ -n "$newest" ]; then echo "Removing $newest"; rm -f "$newest"; fi
 
     - name: Save build cache
@@ -321,7 +324,9 @@ jobs:
       if: ${{ always() && contains(fromJSON('["success","failure","cancelled"]'), steps.build-recipes.outcome) && (runner.os == 'Windows' || steps.build-recipes.outputs.cache-ready == 'true') }}
       uses: actions/cache/save@v5
       with:
-        path: ${{ env.CACHE_DIR }}
+        path: |
+          ${{ env.OUTPUT_DIR }}/${{ matrix.target.platform }}
+          ${{ env.OUTPUT_DIR }}/noarch
         key: ${{ runner.os }}-${{ matrix.distro }}-${{ matrix.target.platform }}-pr-${{ github.event.pull_request.number }}-${{ github.run_id }}-${{ github.run_attempt }}
 
     # Only the newest cache of a pull request/distribution/platform is restored; the ones
diff --git a/.scripts/build_unix.sh b/.scripts/build_unix.sh
index 12c548dac..9f559906d 100755
--- a/.scripts/build_unix.sh
+++ b/.scripts/build_unix.sh
@@ -40,7 +40,13 @@ pixi run -v rs "${ROBOSTACK_DISTRO}" build-ci "${recipe_args[@]}" --output-dir $
 
 # Check if it build something, this is a hotfix for the skips inside additional_recipes
 shopt -s nullglob
-conda_packages=( "${CONDA_BLD_PATH}/${target}"*/*.conda )
+if [[ -n "$target" ]]; then
+    # noarch packages (e.g. the compatibility packages) are uploaded from every platform;
+    # the first upload wins and the others skip
+    conda_packages=( "${CONDA_BLD_PATH}/${target}"*/*.conda "${CONDA_BLD_PATH}/noarch/"*.conda )
+else
+    conda_packages=( "${CONDA_BLD_PATH}/"*/*.conda )
+fi
 if (( ${#conda_packages[@]} > 0 )); then
     # Upload packages one-by-one; the upload task (tools/robostack.py) uploads them to
     # prefix.dev and anaconda.org and skips packages that are already there.
diff --git a/.scripts/build_win.bat b/.scripts/build_win.bat
index 97b29739d..e34056132 100644
--- a/.scripts/build_win.bat
+++ b/.scripts/build_win.bat
@@ -37,17 +37,19 @@ for %%X in (%CURRENT_RECIPES%) do set "RECIPE_ARGS=!RECIPE_ARGS! --recipe %FEEDS
 pixi run -v rs %ROBOSTACK_DISTRO% build-ci !RECIPE_ARGS! --output-dir %CONDA_BLD_PATH%
 if errorlevel 1 exit 1
 
-:: Check if .conda files exist in the win-64 directory
-if exist "%CONDA_BLD_PATH%\win-64\*.conda" (
-    echo Found .conda files, starting upload...
-    rem Upload packages one-by-one; the upload task (tools/robostack.py) uploads them to
-    rem prefix.dev and anaconda.org and skips packages that are already there.
-    for %%F in ("%CONDA_BLD_PATH%\win-64\*.conda") do (
+:: Upload the win-64 and noarch packages one-by-one; the upload task (tools/robostack.py)
+:: uploads them to prefix.dev and anaconda.org and skips packages that are already there
+:: (noarch ones, e.g. the compatibility packages, are uploaded from every platform).
+set FOUND=0
+for %%D in (win-64 noarch) do (
+    for %%F in ("%CONDA_BLD_PATH%\%%D\*.conda") do (
+        set FOUND=1
         echo Uploading %%~fF
         pixi run rs %ROBOSTACK_DISTRO% upload "%%~fF"
         if errorlevel 1 exit 1
     )
-) else (
-    echo Warning: No .conda files found in %CONDA_BLD_PATH%\win-64
+)
+if "!FOUND!" == "0" (
+    echo Warning: No .conda files found in %CONDA_BLD_PATH%\win-64 or %CONDA_BLD_PATH%\noarch
     echo This might be due to all the packages being skipped
 )
diff --git a/AGENTS.md b/AGENTS.md
index 8e51076a9..cb1111f06 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -21,6 +21,10 @@ to read without Claude):
   into `distros/<d>/`.
 - Run everything per distribution with `pixi run rs <distro> <task>`, from the
   repository root. Package names are `ros2-<pkg>` (dashes), e.g. `ros2-rsl`.
+- lyrical builds packages with Python content for Python 3.12-3.14 and the others once
+  (`conditional_python_dependency`, see README "Python versions"). A built-once package
+  that fails its `package_contents` test ships Python after all: add `python` to its
+  `add_host` in `patch/dependencies.yaml`.
 - Never edit `conda_build_config.yaml` by hand: change `shared/pinning/` or the
   distribution's `distro.yaml`, then `pixi run rs <distro> render-pinning` (CI checks it).
 - A change outside `distros/` rebuilds every distribution in CI; keep such PRs focused.
@@ -51,6 +55,7 @@ pixi run rs <d> build --continue-on-failure     # everything missing on the chan
 pixi run rs <d> check-patches [--recipe ros2-<pkg>]
 pixi run rs <d> check-deps                      # pin conflicts, before building anything
 pixi run rs <d> gap-report                      # recipes without artifacts and vice versa
+pixi run rs <d> python-audit [--elf]            # per-Python vs built-once recipes against the published packages
 pixi run rs add-package <pkg>... [<d>...]       # select packages (as the bot does)
 pixi run rs check                               # sanity checks (CI)
 ```
diff --git a/README.md b/README.md
index c3825a728..a77afcf7a 100644
--- a/README.md
+++ b/README.md
@@ -16,7 +16,8 @@ distribution comes from the channel. The older names keep working: for every pac
 there is also a small `ros-<distro>-<package>` package that just depends on
 `ros2-<package>` of the same version (vinca's `package_name_mode: both` in
 `shared/vinca.yaml`), so existing environments and instructions such as
-`pixi add ros-jazzy-desktop` don't break.
+`pixi add ros-jazzy-desktop` don't break. These are `noarch` packages, built once for
+all platforms: each platform's build uploads them, and whichever comes first wins.
 
 **A package is missing?** Open a *Package request* issue. robostack-bot opens a pull
 request that adds it to the build, and a maintainer reviews it.
@@ -106,6 +107,16 @@ pixi run rs check                             # sanity checks (also run in CI)
 of a distribution uses `full_rebuild: true` there. A new build number goes into its
 `pkg_additional_info.yaml` (one package) or `vinca.yaml` (everything).
 
+**Python versions:** a distribution's `pinning_overrides` can list several Pythons, as
+lyrical does for 3.12-3.14. With `conditional_python_dependency: true` in its
+`vinca.yaml`, only packages with Python content (Python modules, rosidl Python bindings,
+extensions) get python in host/run and are built once per Python; the others are built
+once, without a `python_abi` dependency, and fail their build if they ship
+`site-packages` content or a CPython extension anyway. When vinca's guess from
+`package.xml` is wrong, add `python` to the package's `add_host` (or `remove_host`) in
+`patch/dependencies.yaml`. `pixi run rs <distro> python-audit [--elf]` compares the
+guess with the published packages and lists the misses.
+
 **Building only some distributions in a PR:** a PR builds the distributions it changes,
 and all of them as soon as it touches anything outside `distros/<distro>/`. To limit
 that (e.g. a humble rebuild that also changes `shared/` or `tools/`), add the label
diff --git a/distros/lyrical/conda_build_config.yaml b/distros/lyrical/conda_build_config.yaml
index f95422a34..65159c500 100644
--- a/distros/lyrical/conda_build_config.yaml
+++ b/distros/lyrical/conda_build_config.yaml
@@ -1000,8 +1000,9 @@ pythia8:
 python:
   # conda-forge supports only 3.14+ for win-arm64 and linux-riscv64
   # part of a zip_keys: python, is_python_min
+  - 3.12.* *_cpython   # [not ((win and arm64) or riscv64)]
+  - 3.13.* *_cp313     # [not ((win and arm64) or riscv64)]
   - 3.14.* *_cp314
-  - 3.12.* *_cpython
 python_impl:
   - cpython
 
@@ -1009,14 +1010,16 @@ python_impl:
 python_min:
   # minimum supported python version per CFEP-25
   # bump to next minor version when we drop python versions
-  - '3.11'             # [not ((win and arm64) or riscv64)]
+  - '3.12'             # [not ((win and arm64) or riscv64)]
   - '3.14'             # [(win and arm64) or riscv64]
 is_freethreading:
   - false
 is_python_min:
   # part of a zip_keys: python, is_python_min
-  - false
-  - false
+  - true               # [not ((win and arm64) or riscv64)]
+  - false              # [not ((win and arm64) or riscv64)]
+  - false              # [not ((win and arm64) or riscv64)]
+  - true               # [(win and arm64) or riscv64]
 is_abi3:
   - true
 pytorch:
diff --git a/distros/lyrical/distro.yaml b/distros/lyrical/distro.yaml
index 33b9e0ddf..b9f2ed47d 100644
--- a/distros/lyrical/distro.yaml
+++ b/distros/lyrical/distro.yaml
@@ -7,10 +7,21 @@ upload_to: [prefix, anaconda]
 read_from: prefix
 rosdistro_sync: lyrical/2026-10-05
 pinning_overrides:
-  # build every python package for 3.14 (the shared default) and 3.12;
-  # is_python_min is zipped with python, so it needs one entry per version
-  python: [3.14.* *_cp314, 3.12.* *_cpython]
-  is_python_min: [false, false]
+  # Lyrical supports Python 3.12-3.14 (REP 2000). Packages with Python content are
+  # built for each (vinca.yaml: conditional_python_dependency), the others once.
+  # conda-forge has only 3.14+ for win-arm64 and linux-riscv64, so those get one variant.
+  python:
+    - 3.12.* *_cpython # [not ((win and arm64) or riscv64)]
+    - 3.13.* *_cp313   # [not ((win and arm64) or riscv64)]
+    - 3.14.* *_cp314
+  is_python_min:
+    - true             # [not ((win and arm64) or riscv64)]
+    - false            # [not ((win and arm64) or riscv64)]
+    - false            # [not ((win and arm64) or riscv64)]
+    - true             # [(win and arm64) or riscv64]
+  python_min:
+    - '3.12'           # [not ((win and arm64) or riscv64)]
+    - '3.14'           # [(win and arm64) or riscv64]
   # every pyqt6 6.11.0 build on conda-forge needs qt6-main <=6.11.2, but the shared
   # `6.11` pin resolves to 6.11.3, whose run export (>=6.11.3) rules pyqt6 out: the
   # rqt packages then can't be installed with python_qt_binding. The published
diff --git a/distros/lyrical/vinca.yaml b/distros/lyrical/vinca.yaml
index 15070a041..2306e66a9 100644
--- a/distros/lyrical/vinca.yaml
+++ b/distros/lyrical/vinca.yaml
@@ -3,7 +3,12 @@ ros_distro: lyrical
 patch_dir: patch
 rosdistro_snapshot: rosdistro_snapshot.yaml
 rosdistro_additional_recipes: rosdistro_additional_recipes.yaml
-build_number: 30
+build_number: 31
+# Only packages with Python content get python in host/run, and with it the Python
+# variants of distro.yaml (cp312-cp314); the others are built once, without a
+# python_abi dependency. Override the classification per package with python in
+# add_host (or remove_host) in patch/dependencies.yaml.
+conditional_python_dependency: true
 
 mutex_package:
   version: 0.22.0
diff --git a/pixi.lock b/pixi.lock
index ab0edb4f3..c8f90e8ec 100644
--- a/pixi.lock
+++ b/pixi.lock
@@ -68,6 +68,7 @@ environments:
       - conda: https://prefix.dev/conda-forge/linux-64/ncurses-6.6-hdb14827_1.conda
       - conda: https://prefix.dev/conda-forge/linux-64/openssl-3.6.5-h781a0a9_0.conda
       - conda: https://prefix.dev/conda-forge/linux-64/patchelf-0.19.2-hee9eb32_0.conda
+      - conda: https://prefix.dev/conda-forge/linux-64/py-rattler-0.28.1-py311hc91d8b8_0.conda
       - conda: https://prefix.dev/conda-forge/linux-64/python-3.14.7-hcd007b5_106_cp314.conda
       - conda: https://prefix.dev/conda-forge/linux-64/pyyaml-6.0.3-py314h67df5f8_1.conda
       - conda: https://prefix.dev/conda-forge/linux-64/rattler-build-0.80.0-hf01adef_0.conda
@@ -77,28 +78,29 @@ environments:
       - conda: https://prefix.dev/conda-forge/linux-64/tk-8.6.13-noxft_h1df4ec4_4.conda
       - conda: https://prefix.dev/conda-forge/linux-64/yaml-0.2.5-hebe6cf0_3.conda
       - conda: https://prefix.dev/conda-forge/linux-64/zstd-1.5.7-hb78ec9c_7.conda
+      - conda: https://prefix.dev/conda-forge/noarch/_python_abi3_support-1.0-hd8ed1ab_3.conda
       - conda: https://prefix.dev/conda-forge/noarch/ca-certificates-2026.7.22-hbd8a1cb_0.conda
       - conda: https://prefix.dev/conda-forge/noarch/colorama-0.4.6-pyhd8ed1ab_1.conda
+      - conda: https://prefix.dev/conda-forge/noarch/cpython-3.14.10-py314hd8ed1ab_100.conda
       - conda: https://prefix.dev/conda-forge/noarch/exceptiongroup-1.3.1-pyhd8ed1ab_0.conda
       - conda: https://prefix.dev/conda-forge/noarch/iniconfig-2.3.0-pyhd8ed1ab_0.conda
       - conda: https://prefix.dev/conda-forge/noarch/packaging-26.3-pyhc364b38_0.conda
       - conda: https://prefix.dev/conda-forge/noarch/pluggy-1.6.0-pyhf9edf01_1.conda
       - conda: https://prefix.dev/conda-forge/noarch/pygments-2.21.0-pyhcf101f3_0.conda
       - conda: https://prefix.dev/conda-forge/noarch/pytest-9.1.1-pyhc364b38_2.conda
+      - conda: https://prefix.dev/conda-forge/noarch/python-gil-3.14.10-h4df99d1_100.conda
       - conda: https://prefix.dev/conda-forge/noarch/python_abi-3.14-9_cp314.conda
       - conda: https://prefix.dev/conda-forge/noarch/setuptools-81.0.0-pyh332efcf_0.conda
       - conda: https://prefix.dev/conda-forge/noarch/tomli-2.5.0-pyh5ded981_0.conda
       - conda: https://prefix.dev/conda-forge/noarch/typing_extensions-4.16.0-pyhcf101f3_0.conda
       - conda: https://prefix.dev/conda-forge/noarch/tzdata-2026c-h151e31d_0.conda
-      - pypi: git+https://github.com/RoboStack/vinca.git?rev=74d1e856d5b00c0cb5ee0c1be41dac4afcae7bf5#74d1e856d5b00c0cb5ee0c1be41dac4afcae7bf5
+      - pypi: git+https://github.com/EzraBrooks/vinca.git?rev=ec69ef82c330e52496bb11a60004a9d06a80ae0b#ec69ef82c330e52496bb11a60004a9d06a80ae0b
       - pypi: https://files.pythonhosted.org/packages/0b/a7/71ac2cff56fec219ed242bb11b8efb69fcc4bec75db06fb7bfe35de520e6/certifi-2026.7.22-py3-none-any.whl
       - pypi: https://files.pythonhosted.org/packages/12/74/ef303ec980ef962ffe548fa36cb138bb399d1d1315731ba7bb81da85f7e0/rosdistro-1.1.0-py3-none-any.whl
       - pypi: https://files.pythonhosted.org/packages/12/b3/231ffd4ab1fc9d679809f356cebee130ac7daa00d6d6f3206dd4fd137e9e/distro-1.9.0-py3-none-any.whl
       - pypi: https://files.pythonhosted.org/packages/15/63/327d25d91af32209b394abe5626706c4b7ad5a4812cc464a4e3a2be6916f/rospkg-1.6.3-py3-none-any.whl
       - pypi: https://files.pythonhosted.org/packages/18/24/bad3ac4271589df29cf5ce2f5ae490518a5739358052bd0d61209e6fea54/charset_normalizer-3.5.2-cp314-cp314-manylinux2014_x86_64.manylinux_2_17_x86_64.manylinux_2_28_x86_64.whl
-      - pypi: https://files.pythonhosted.org/packages/31/dc/cc50210e11e465c975462439a492516a73300ab8caa8f5e0902544fd748b/zstandard-0.25.0-cp314-cp314-manylinux2014_x86_64.manylinux_2_17_x86_64.manylinux_2_28_x86_64.whl
       - pypi: https://files.pythonhosted.org/packages/32/91/30151a39f7570f448ed84529390628a651d7f27c87d73c9b887f8189695e/docutils-0.23-py3-none-any.whl
-      - pypi: https://files.pythonhosted.org/packages/35/79/5e2cffa1c77432f11cd93a5351f30732c997a239d3a3090856a72d6d8ba7/ruamel.yaml-0.17.40-py3-none-any.whl
       - pypi: https://files.pythonhosted.org/packages/38/bb/d215ee7c73b61497b28a5503f9f53523f294fcc936762b7caf90e0c1c2b5/pyparsing-3.3.3-py3-none-any.whl
       - pypi: https://files.pythonhosted.org/packages/3b/95/88ed47cb7da88569a78b7d6fb9420298df7e99997810c844a924d96d3c08/empy-3.3.4.tar.gz
       - pypi: https://files.pythonhosted.org/packages/3f/53/b5e80bac66d0db921ddbbe3c8d37198455c19302a29da1a434708c35c79d/catkin_pkg-1.1.1-py3-none-any.whl
@@ -113,6 +115,7 @@ environments:
       - pypi: https://files.pythonhosted.org/packages/b3/38/89ba8ad64ae25be8de66a6d463314cf1eb366222074cfda9ee839c56a4b4/mdurl-0.1.2-py3-none-any.whl
       - pypi: https://files.pythonhosted.org/packages/b3/81/4da04ced5a082363ecfa159c010d200ecbd959ae410c10c0264a38cac0f5/markdown_it_py-4.2.0-py3-none-any.whl
       - pypi: https://files.pythonhosted.org/packages/b7/ce/149a00dd41f10bc29e5921b496af8b574d8413afcd5e30dfa0ed46c2cc5e/six-1.17.0-py2.py3-none-any.whl
+      - pypi: https://files.pythonhosted.org/packages/b8/0c/51f6841f1d84f404f92463fc2b1ba0da357ca1e3db6b7fbda26956c3b82a/ruamel_yaml-0.19.1-py3-none-any.whl
       - pypi: https://files.pythonhosted.org/packages/e5/ca/78d423b324b8d77900030fa59c4aa9054261ef0925631cd2501dd015b7b7/boolean_py-5.0-py3-none-any.whl
       - pypi: https://files.pythonhosted.org/packages/ec/57/56b9bcc3c9c6a792fcbaf139543cee77261f3651ca9da0c93f5c1221264b/python_dateutil-2.9.0.post0-py2.py3-none-any.whl
       linux-aarch64-glibc-2-17:
@@ -148,6 +151,7 @@ environments:
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-  name: zstandard
-  version: 0.25.0
-  sha256: c19bcdd826e95671065f8692b5a4aa95c52dc7a02a4c5a0cac46deb879a017a2
-  requires_dist:
-  - cffi~=1.17 ; python_full_version < '3.14' and platform_python_implementation != 'PyPy' and extra == 'cffi'
-  - cffi>=2.0.0b0 ; python_full_version >= '3.14' and platform_python_implementation != 'PyPy' and extra == 'cffi'
-  requires_python: '>=3.9'
 - pypi: https://files.pythonhosted.org/packages/3b/95/88ed47cb7da88569a78b7d6fb9420298df7e99997810c844a924d96d3c08/empy-3.3.4.tar.gz
   name: empy
   version: 3.3.4
   sha256: 73ac49785b601479df4ea18a7c79bc1304a8a7c34c02b9472cf1206ae88f01b3
-- pypi: https://files.pythonhosted.org/packages/3d/5c/f8923b595b55fe49e30612987ad8bf053aef555c14f05bb659dd5dbe3e8a/zstandard-0.25.0-cp314-cp314-macosx_10_13_x86_64.whl
-  name: zstandard
-  version: 0.25.0
-  sha256: e29f0cf06974c899b2c188ef7f783607dbef36da4c242eb6c82dcd8b512855e3
-  requires_dist:
-  - cffi~=1.17 ; python_full_version < '3.14' and platform_python_implementation != 'PyPy' and extra == 'cffi'
-  - cffi>=2.0.0b0 ; python_full_version >= '3.14' and platform_python_implementation != 'PyPy' and extra == 'cffi'
-  requires_python: '>=3.9'
 - pypi: https://files.pythonhosted.org/packages/3f/53/b5e80bac66d0db921ddbbe3c8d37198455c19302a29da1a434708c35c79d/catkin_pkg-1.1.1-py3-none-any.whl
   name: catkin-pkg
   version: 1.1.1
@@ -3507,14 +3630,6 @@ packages:
   - markdown-it-py>=2.2.0
   - pygments>=2.13.0,<3.0.0
   requires_python: '>=3.9.0'
-- pypi: https://files.pythonhosted.org/packages/8d/09/d0a2a14fc3439c5f874042dca72a79c70a532090b7ba0003be73fee37ae2/zstandard-0.25.0-cp314-cp314-macosx_11_0_arm64.whl
-  name: zstandard
-  version: 0.25.0
-  sha256: 05df5136bc5a011f33cd25bc9f506e7426c0c9b3f9954f056831ce68f3b6689f
-  requires_dist:
-  - cffi~=1.17 ; python_full_version < '3.14' and platform_python_implementation != 'PyPy' and extra == 'cffi'
-  - cffi>=2.0.0b0 ; python_full_version >= '3.14' and platform_python_implementation != 'PyPy' and extra == 'cffi'
-  requires_python: '>=3.9'
 - pypi: https://files.pythonhosted.org/packages/8f/db/d7282caf7ab03af44d5d6fdbaa019b35c7d7f1c90588b839c07cba640d6a/markupsafe-3.0.4-cp314-cp314-manylinux2014_x86_64.manylinux_2_17_x86_64.manylinux_2_28_x86_64.whl
   name: markupsafe
   version: 3.0.4
@@ -3548,14 +3663,6 @@ packages:
   - pysocks>=1.5.6,!=1.5.7 ; extra == 'socks'
   - chardet>=3.0.2,<8 ; extra == 'use-chardet-on-py3'
   requires_python: '>=3.10'
-- pypi: https://files.pythonhosted.org/packages/a4/86/a48e56320d0a17189ab7a42645387334fba2200e904ee47fc5a26c1fd8ca/zstandard-0.25.0-cp314-cp314-manylinux2014_aarch64.manylinux_2_17_aarch64.manylinux_2_28_aarch64.whl
-  name: zstandard
-  version: 0.25.0
-  sha256: 223415140608d0f0da010499eaa8ccdb9af210a543fac54bce15babbcfc78439
-  requires_dist:
-  - cffi~=1.17 ; python_full_version < '3.14' and platform_python_implementation != 'PyPy' and extra == 'cffi'
-  - cffi>=2.0.0b0 ; python_full_version >= '3.14' and platform_python_implementation != 'PyPy' and extra == 'cffi'
-  requires_python: '>=3.9'
 - pypi: https://files.pythonhosted.org/packages/ad/40/e2d117b048d47282ade906fbfd92814cbee5647afc13fda88a3406039372/markupsafe-3.0.4-cp314-cp314-macosx_11_0_arm64.whl
   name: markupsafe
   version: 3.0.4
@@ -3624,6 +3731,17 @@ packages:
   version: 1.17.0
   sha256: 4721f391ed90541fddacab5acf947aa0d3dc7d27b2e1e8eda2be8970586c3274
   requires_python: '>=2.7,!=3.0.*,!=3.1.*,!=3.2.*'
+- pypi: https://files.pythonhosted.org/packages/b8/0c/51f6841f1d84f404f92463fc2b1ba0da357ca1e3db6b7fbda26956c3b82a/ruamel_yaml-0.19.1-py3-none-any.whl
+  name: ruamel-yaml
+  version: 0.19.1
+  sha256: 27592957fedf6e0b62f281e96effd28043345e0e66001f97683aa9a40c667c93
+  requires_dist:
+  - ruamel-yaml-clib ; platform_python_implementation == 'CPython' and extra == 'oldlibyaml'
+  - ruamel-yaml-clibz>=0.3.7 ; platform_python_implementation == 'CPython' and extra == 'libyaml'
+  - ruamel-yaml-jinja2>=0.2 ; extra == 'jinja2'
+  - ryd ; extra == 'docs'
+  - mercurial>5.7 ; extra == 'docs'
+  requires_python: '>=3.9'
 - pypi: https://files.pythonhosted.org/packages/d1/78/5ed86f743d4bc350db307e7636419a0a5ee1d91806d30c7f667bd5c80dae/charset_normalizer-3.5.2-cp314-cp314-win_amd64.whl
   name: charset-normalizer
   version: 3.5.2
diff --git a/pixi.toml b/pixi.toml
index c76cfff92..4de7ddfd3 100644
--- a/pixi.toml
+++ b/pixi.toml
@@ -21,6 +21,7 @@ rattler-build = ">=0.80.0,<0.81"
 cmake = "<4.0"
 setuptools = "<82.0"
 rattler-index = ">=0.27.16"
+py-rattler = ">=0.28.1,<0.29"
 pyyaml = "*"
 # Some git repos need git-lfs, see https://github.com/RoboStack/ros-jazzy/issues/118
 git-lfs = "*"
@@ -36,7 +37,7 @@ git = "*"
 
 [pypi-dependencies]
 # One vinca for all distributions.
-vinca = { git = "https://github.com/RoboStack/vinca.git", rev = "74d1e856d5b00c0cb5ee0c1be41dac4afcae7bf5" }
+vinca = { git = "https://github.com/EzraBrooks/vinca.git", rev = "ec69ef82c330e52496bb11a60004a9d06a80ae0b" }
 # For local development, temporarily use (and regenerate pixi.lock):
 # vinca = { path = "../vinca", editable = true }
 
@@ -44,5 +45,5 @@ vinca = { git = "https://github.com/RoboStack/vinca.git", rev = "74d1e856d5b00c0
 rs = { cmd = "python tools/robostack.py", description = "Run a task for one distribution: `pixi run rs <distro> <task>` (generate-recipes, build, build-one, check-patches, check-deps, create-snapshot, render-pinning, sort, ...)." }
 sort = { cmd = "sh -lc 'vinca-sort-vinca-lists $@ shared/vinca.yaml && vinca-sort-yaml-keys $@ shared/robostack.yaml shared/pkg_additional_info.yaml shared/patch/dependencies.yaml && for d in distros/*/; do (cd $d && vinca-sort-vinca-lists $@ vinca.yaml && vinca-sort-yaml-keys $@ pkg_additional_info.yaml rosdistro_additional_recipes.yaml $(ls patch/dependencies.yaml 2>/dev/null)) || exit 1; done' --", description = "Sort the YAML files of all distributions (`--check` to only check)." }
 test = { cmd = "python -m pytest tools/tests", description = "Unit tests of the repository tooling (tools/tests)." }
-abi-check = { cmd = "pixi exec -s python=3.14 -s zstandard -s pyyaml -s pyelftools python tools/abi_check.py", description = "Compare the ABI of package builds with libabigail (Linux only): `pixi run abi-check --distro jazzy --latest-pairs 30`, `--old a.conda --new b.conda`, or `--pr-builds <dir>` (a pull request's builds against the released ones)." }
+abi-check = { cmd = "pixi exec -s python=3.14 -s py-rattler -s pyyaml -s pyelftools python tools/abi_check.py", description = "Compare the ABI of package builds with libabigail (Linux only): `pixi run abi-check --distro jazzy --latest-pairs 30`, `--old a.conda --new b.conda`, or `--pr-builds <dir>` (a pull request's builds against the released ones)." }
 render-pinning = { cmd = "sh -lc 'for d in distros/*/; do python tools/robostack.py $(basename $d) render-pinning || exit 1; done'", description = "Regenerate every distribution's conda_build_config.yaml from shared/pinning and its distro.yaml." }
diff --git a/tools/abi_check.py b/tools/abi_check.py
index 0aab03c67..28bea9c98 100644
--- a/tools/abi_check.py
+++ b/tools/abi_check.py
@@ -30,62 +30,48 @@
 from __future__ import annotations
 
 import argparse
-import io
+import asyncio
 import re
 import json
 import os
 import shutil
 import subprocess
 import sys
-import tarfile
 import tempfile
-import urllib.error
-import urllib.request
-import zipfile
 from pathlib import Path
 
-import zstandard
+import rattler
+from rattler.exceptions import FetchRepoDataError
+from rattler.package_streaming import download_and_extract, download_to_path, extract
 
 # abidiff exit status bits (libabigail's abidiff_status)
 ABI_ERROR = 1
 ABI_USAGE_ERROR = 2
 ABI_CHANGE = 4
 ABI_INCOMPATIBLE_CHANGE = 8
+REPODATA_CACHE = Path(tempfile.gettempdir()) / "robostack-abi-check-repodata"
 
 
-def _open(url: str):
-    return urllib.request.urlopen(urllib.request.Request(url, headers={"User-Agent": "robostack-abi-check"}), timeout=300)
-
-
-def extract_conda(path: Path, dest: Path) -> None:
-    """Unpack a .conda (zip with zstd-compressed tarballs) or .tar.bz2 package."""
-    dest.mkdir(parents=True, exist_ok=True)
-    if path.suffix == ".conda":
-        with zipfile.ZipFile(path) as z:
-            for name in z.namelist():
-                if name.startswith("pkg-") and name.endswith(".tar.zst"):
-                    data = zstandard.ZstdDecompressor().stream_reader(io.BytesIO(z.read(name)))
-                    with tarfile.open(fileobj=data, mode="r|") as tar:
-                        tar.extractall(dest, filter="data")
-    else:
-        with tarfile.open(path, "r:bz2") as tar:
-            tar.extractall(dest, filter="data")
+def read_index(path: Path) -> dict:
+    """The repodata record of a package file (its info/index.json)."""
+    return json.loads(asyncio.run(rattler.RepoDataRecord.from_package_archive(path)).to_json())
 
 
-def read_index(path: Path) -> dict:
-    """info/index.json of a package."""
-    if path.suffix == ".conda":
-        with zipfile.ZipFile(path) as z:
-            name = next(n for n in z.namelist() if n.startswith("info-") and n.endswith(".tar.zst"))
-            data = zstandard.ZstdDecompressor().stream_reader(io.BytesIO(z.read(name)))
-            with tarfile.open(fileobj=data, mode="r|") as tar:
-                for member in tar:
-                    if member.name == "info/index.json":
-                        return json.load(tar.extractfile(member))
-    else:
-        with tarfile.open(path, "r:bz2") as tar:
-            return json.load(tar.extractfile("info/index.json"))
-    raise ValueError(f"{path} has no info/index.json")
+def channel_records(channel: str, platform: str) -> list[dict]:
+    """The repodata records of the channel for the platform (none when it has no
+    packages for it). The abi-check task runs without vinca, so not vinca's
+    get_channel_records."""
+    try:
+        [repodata] = asyncio.run(rattler.fetch_repo_data(
+            channels=[rattler.Channel(channel)], platforms=[rattler.Subdir(platform)],
+            cache_path=REPODATA_CACHE, callback=None,
+        ))
+    except FetchRepoDataError as error:
+        # network failures raise the same type
+        if not str(error).startswith("repodata not found"):
+            raise
+        return []
+    return [json.loads(record.to_json()) for record in repodata.load_all_records()]
 
 
 def libraries(prefix: Path) -> dict[str, Path]:
@@ -125,8 +111,8 @@ def classify(rc: int, report: str) -> str:
 def compare(old_pkg: Path, new_pkg: Path, work: Path) -> dict:
     a, b = work / "old", work / "new"
     shutil.rmtree(work, ignore_errors=True)
-    extract_conda(old_pkg, a)
-    extract_conda(new_pkg, b)
+    extract(old_pkg, a)
+    extract(new_pkg, b)
     old_libs, new_libs = libraries(a), libraries(b)
     result = {"libraries": {}, "removed_libraries": sorted(set(old_libs) - set(new_libs)),
               "headers": header_changes(a, b)}
@@ -225,10 +211,6 @@ def short_name(name: str, distro: str) -> str | None:
     return None
 
 
-def _version_key(v: str):
-    return [int(p) if p.isdigit() else 0 for p in v.replace("-", ".").split(".")]
-
-
 def _belongs_to(rec: dict, distro: str) -> bool:
     """A record of this distribution: ros-<distro>-* names, or ros2-* builds pinned to
     its mutex (a channel such as the test channel can hold several distributions)."""
@@ -243,15 +225,7 @@ def released(channels: str | list[str], platform: str, distro: str) -> dict[str,
     packages are left out."""
     by_name: dict[str, dict[str, dict]] = {}
     for channel in [channels] if isinstance(channels, str) else channels:
-        try:
-            with _open(f"{channel.rstrip('/')}/{platform}/repodata.json") as r:
-                data = json.load(r)
-        except urllib.error.HTTPError as error:
-            if error.code == 404:  # no packages for this platform there
-                continue
-            raise
-        records = list(data.get("packages", {}).items()) + list(data.get("packages.conda", {}).items())
-        for filename, rec in records:
+        for rec in channel_records(channel, platform):
             short = short_name(rec["name"], distro)
             if short is None or _is_compatibility_package(rec) or not _belongs_to(rec, distro):
                 continue
@@ -260,12 +234,12 @@ def released(channels: str | list[str], platform: str, distro: str) -> dict[str,
             if current is None or (rec.get("build_number", 0), rec.get("timestamp", 0)) > (
                 current.get("build_number", 0), current.get("timestamp", 0)
             ):
-                versions[rec["version"]] = {"file": filename, "channel": channel, **rec}
+                versions[rec["version"]] = {**rec, "file": rec["fn"], "channel": channel}
     return by_name
 
 
 def newest(versions: dict[str, dict]) -> dict:
-    return versions[max(versions, key=_version_key)]
+    return versions[max(versions, key=rattler.Version)]
 
 
 def latest_pairs(channel: str, platform: str, count: int, distro: str) -> list[tuple[str, dict, dict]]:
@@ -275,7 +249,7 @@ def latest_pairs(channel: str, platform: str, count: int, distro: str) -> list[t
     for short, versions in sorted(released(channel, platform, distro).items()):
         if len(versions) < 2:
             continue
-        ordered = sorted(versions, key=_version_key)
+        ordered = sorted(versions, key=rattler.Version)
         pairs.append((short, versions[ordered[-2]], versions[ordered[-1]]))
     # most recently uploaded new versions first
     pairs.sort(key=lambda p: p[2].get("timestamp", 0), reverse=True)
@@ -343,11 +317,10 @@ def channel_for(distro: str) -> list[str]:
     return extra + [rs.repodata_url(distro)]
 
 
-def download(channel: str, platform: str, filename: str, dest: Path) -> Path:
-    target = dest / filename
+def download(rec: dict, dest: Path) -> Path:
+    target = dest / rec["file"]
     if not target.exists():
-        with _open(f"{channel.rstrip('/')}/{platform}/{filename}") as r, open(target, "wb") as f:
-            shutil.copyfileobj(r, f)
+        asyncio.run(download_to_path(rattler.Client(), rec["url"], target))
     return target
 
 
@@ -355,19 +328,16 @@ def download(channel: str, platform: str, filename: str, dest: Path) -> Path:
 MAX_DEPENDENTS_TO_INSPECT = 40
 
 
-def linking_dependents(channel, platform, by_name, candidates, sonames, downloads: Path, tmp: Path) -> dict:
+def linking_dependents(by_name, candidates, sonames, tmp: Path) -> dict:
     """Which of the dependents link to one of the SONAMEs (and so need a rebuild);
     metapackages, Python packages and configurations don't."""
     if len(candidates) > MAX_DEPENDENTS_TO_INSPECT:
         return {"rebuild": candidates, "checked": False}
     rebuild = []
     for name in candidates:
-        rec = newest(by_name[name])
-        pkg = download(rec["channel"], platform, rec["file"], downloads)
         target = tmp / "dependent"
         shutil.rmtree(target, ignore_errors=True)
-        extract_conda(pkg, target)
-        pkg.unlink(missing_ok=True)
+        asyncio.run(download_and_extract(rattler.Client(), newest(by_name[name])["url"], target))
         if needed(target) & set(sonames):
             rebuild.append(name)
     return {"rebuild": rebuild, "checked": True, "candidates": len(candidates)}
@@ -407,14 +377,14 @@ def check_pr_builds(pr_dir: Path, channel: str, platform: str, distro: str, tmp:
         if old["file"] == pkg.name:
             continue
         print(f"{short}: {old['version']} (build {old.get('build_number', 0)}) -> {index['version']} (PR)", flush=True)
-        old_pkg = download(old["channel"], platform, old["file"], downloads)
+        old_pkg = download(old, downloads)
         res = compare(old_pkg, pkg, tmp / "work")
         old_pkg.unlink(missing_ok=True)
         res.update(old=f"{old['version']} (build {old.get('build_number', 0)})", new=index["version"],
                    pins=pin_changes(old, index, distro))
         if res["broken_sonames"]:
             res["dependents"] = linking_dependents(
-                channel, platform, by_name, dependents(by_name, short, distro), res["broken_sonames"], downloads, tmp
+                by_name, dependents(by_name, short, distro), res["broken_sonames"], tmp
             )
         results[short] = res
         print(f"  -> {res['verdict']}", flush=True)
@@ -566,8 +536,8 @@ def main() -> int:
             downloads.mkdir()
             for name, old, new in latest_pairs(channel, args.platform, args.latest_pairs, args.distro):
                 print(f"{name}: {old['version']} -> {new['version']}", flush=True)
-                old_pkg = download(old["channel"], args.platform, old["file"], downloads)
-                new_pkg = download(new["channel"], args.platform, new["file"], downloads)
+                old_pkg = download(old, downloads)
+                new_pkg = download(new, downloads)
                 res = compare(old_pkg, new_pkg, tmp / "work")
                 res.update(old=old["version"], new=new["version"])
                 results[name] = res
diff --git a/tools/build_gap_report.py b/tools/build_gap_report.py
index 945e947d9..fa814e559 100644
--- a/tools/build_gap_report.py
+++ b/tools/build_gap_report.py
@@ -2,7 +2,8 @@
 """Report gaps between generated recipes and built conda artifacts.
 
 Default behavior is platform-agnostic: it inspects all output/<platform> folders that
-contain conda artifacts and reports gaps per platform. Only artifacts built with the
+contain conda artifacts and reports gaps per platform; output/noarch artifacts count for
+every platform. Only artifacts built with the
 CURRENT build_number (and, for the mutex package, its own build_number) are counted —
 older-build_number leftovers from a previous full rebuild are ignored, since counting
 them makes the report claim far more packages are done than the current build actually
@@ -293,8 +294,12 @@ def main() -> int:
         )
         print(f"Filtering to build_number {build_number}{mutex_note}{override_note}\n")
 
+    # noarch packages (e.g. the compatibility packages) count as built on every platform
+    built_noarch = built_packages_for_platform(
+        output_root, "noarch", build_number, mutex_norm_name, mutex_build_number, pkg_build_number_overrides
+    )
     for idx, platform in enumerate(selected_platforms):
-        built = built_packages_for_platform(
+        built = built_noarch | built_packages_for_platform(
             output_root, platform, build_number, mutex_norm_name, mutex_build_number, pkg_build_number_overrides
         )
 
diff --git a/tools/check_dependency_compat.py b/tools/check_dependency_compat.py
index ff145731f..d03217230 100644
--- a/tools/check_dependency_compat.py
+++ b/tools/check_dependency_compat.py
@@ -47,6 +47,8 @@
 from urllib.request import Request, urlopen
 
 import ruamel.yaml
+from rattler import Version, VersionSpec
+from rattler.exceptions import InvalidVersionError, InvalidVersionSpecError
 
 ROS_PREFIXES = ("ros-", "ros2-")
 DEFAULT_CHANNELS = ["https://repo.prefix.dev/conda-forge"]
@@ -659,7 +661,7 @@ def report_conflicts(
         if any(len(spec.split()) > 1 for _, spec in specs):
             print("   note: the spec is version-restricted (dummy package in pkg_additional_info.yaml?);"
                   " a newer conda-forge version may already be built against the pinned libraries.")
-        glibc_needs = sorted({m.group(1) for m in _GLIBC_NEED_RE.finditer(block)}, key=version_tuple)
+        glibc_needs = sorted({m.group(1) for m in _GLIBC_NEED_RE.finditer(block)}, key=Version)
         if (glibc_needs and host_names is not None and normalized(culprit) not in host_names
                 and args.platform.startswith("linux")
                 and solver.solve(f"glibc-{culprit}", pins, specs, glibc=glibc_needs[-1])[0]):
@@ -793,74 +795,31 @@ def report_migrations(
 
 
 # ----------------------------------------------------------------------- stale
-_VERSION_PART_RE = re.compile(r"^(\d+)(.*)$")
-
-
-def version_tuple(version: str) -> tuple[int, ...]:
-    parts: list[int] = []
-    for part in version.strip().split("."):
-        match = _VERSION_PART_RE.match(part)
-        if not match:
-            break
-        parts.append(int(match.group(1)))
-        if match.group(2):  # pre-release suffix such as '0a0': stop here
-            break
-    return tuple(parts)
-
-
-def _pad(t: tuple[int, ...], n: int) -> tuple[int, ...]:
-    return t + (0,) * (n - len(t))
-
-
-def _cmp(a: tuple[int, ...], b: tuple[int, ...]) -> int:
-    n = max(len(a), len(b))
-    a, b = _pad(a, n), _pad(b, n)
-    return (a > b) - (a < b)
-
-
-def pin_range(pin_version: str) -> tuple[tuple[int, ...], tuple[int, ...], bool]:
-    """Return (lowest, upper_exclusive, exact) for a pin such as '1.90', '7.35.1.*' or '11.*'."""
-    text = pin_version.strip()
-    exact = not text.endswith(".*") and "*" not in text
-    prefix = version_tuple(text.rstrip("*").rstrip("."))
-    if not prefix:
-        return (0,), (10**9,), False
-    upper = prefix[:-1] + (prefix[-1] + 1,)
-    return prefix, upper, exact
+_SPEC_VERSION_RE = re.compile(r"\d[0-9A-Za-z_.+!]*")
 
 
 def constraint_compatible(constraint: str, pin_version: str) -> bool:
-    """Whether some version can satisfy both the dependency constraint and the pin."""
-    low, upper_excl, _ = pin_range(pin_version)
-    constraint = constraint.strip()
-    if constraint in ("", "*"):
+    """Whether some version can satisfy both the dependency constraint and the pin
+    ('1.90', '1.90.*': every version starting with 1.90)."""
+    pin = pin_version.strip().rstrip("*").rstrip(".")
+    if not pin[:1].isdigit():
+        return True
+    try:
+        spec = VersionSpec(constraint.strip() or "*")
+        pinned = VersionSpec(f"{pin}.*")
+    except InvalidVersionSpecError:
         return True
-    if "|" in constraint:
-        return any(constraint_compatible(part, pin_version) for part in constraint.split("|"))
-    for clause in [c.strip() for c in constraint.split(",") if c.strip()]:
-        if clause.startswith(">="):
-            if _cmp(upper_excl, version_tuple(clause[2:])) <= 0:
-                return False
-        elif clause.startswith(">"):
-            if _cmp(upper_excl, version_tuple(clause[1:])) <= 0:
-                return False
-        elif clause.startswith("<="):
-            if _cmp(low, version_tuple(clause[2:])) > 0:
-                return False
-        elif clause.startswith("<"):
-            if _cmp(low, version_tuple(clause[1:])) >= 0:
-                return False
-        elif clause.startswith("!="):
+    # rattler can't intersect specs; if the two overlap, the lowest version they share
+    # is the pin's, a bound of the constraint, or (for a > bound) just above one
+    bounds = [v.rstrip(".") for v in _SPEC_VERSION_RE.findall(constraint)]
+    for candidate in [pin, *bounds, *(f"{v}.1" for v in bounds)]:
+        try:
+            version = Version(candidate)
+        except InvalidVersionError:
             continue
-        else:
-            other = clause[2:] if clause.startswith("==") else clause
-            other_low, other_upper, _ = pin_range(other)
-            n = max(len(low), len(other_low))
-            a, b = _pad(low, n), _pad(other_low, n)
-            k = min(len(low), len(other_low))
-            if a[:k] != b[:k]:
-                return False
-    return True
+        if spec.matches(version) and pinned.matches(version):
+            return True
+    return False
 
 
 _CBC_KEY_RE = re.compile(r"^([A-Za-z0-9_.-]+):\s*(?:#\s*\[(.+?)\])?\s*$")
@@ -937,21 +896,21 @@ def variant_pins(variant_config: Path, platform: str) -> dict[str, str]:
 
 
 def load_repodata(source: str, platform: str) -> tuple[dict[str, Any], bool]:
+    """The records of a channel URL, a platform directory of a local channel
+    (output/<platform>) or either's repodata.json, by file name."""
+    from vinca.utils import get_channel_records
+
     remote = "://" in source
     if remote:
-        url = source.rstrip("/")
-        if not url.endswith("repodata.json"):
-            url = f"{url}/{platform}/repodata.json"
-        with _urlopen(url, timeout=300) as response:
-            data = json.load(response)
+        channel = source.rstrip("/")
+        if channel.endswith("/repodata.json"):
+            channel, platform = channel.removesuffix("/repodata.json").rsplit("/", 1)
     else:
         path = Path(source)
-        if path.is_dir():
-            path = path / "repodata.json"
-        data = json.loads(path.read_text(encoding="utf-8"))
-    packages = dict(data.get("packages", {}))
-    packages.update(data.get("packages.conda", {}))
-    return packages, remote
+        if path.name == "repodata.json":
+            path = path.parent
+        channel, platform = str(path.parent), path.name
+    return {record["fn"]: record for record in get_channel_records(channel, platform)}, remote
 
 
 def ros_name_map(vinca_conf: dict[str, Any]) -> dict[str, str]:
diff --git a/tools/ci_build.py b/tools/ci_build.py
index d87b153c7..5b3e28eed 100644
--- a/tools/ci_build.py
+++ b/tools/ci_build.py
@@ -10,15 +10,21 @@
 import subprocess
 import sys
 
+from ci_config import cache_dirs
+
 
 class Interrupted(Exception):
     def __init__(self, signum):
         self.code = 124 if signum == signal.SIGALRM else 128 + signum
 
 
-def run(cmd: list[str], cache_dir: Path, timeout: float) -> int:
-    cache_dir = cache_dir.resolve()
-    original = {p: (p.stat().st_mtime_ns, p.stat().st_size) for p in cache_dir.glob("*.conda")}
+def run(cmd: list[str], package_dirs: list[Path], timeout: float) -> int:
+    package_dirs = [d.resolve() for d in package_dirs]
+
+    def archives():
+        return [p for d in package_dirs for p in d.glob("*.conda")]
+
+    original = {p: (p.stat().st_mtime_ns, p.stat().st_size) for p in archives()}
     completed = set()
 
     def output(line):
@@ -57,7 +63,7 @@ def interrupt(signum, frame):
                 output(line)
             proc.stdout.close()
             # Parallel builds can leave several partial archives, not just the newest one.
-            for p in cache_dir.glob("*.conda"):
+            for p in archives():
                 if p not in completed and original.get(p) != (p.stat().st_mtime_ns, p.stat().st_size):
                     print(f"Removing unfinished archive: {p}", flush=True)
                     p.unlink()
@@ -72,10 +78,11 @@ def interrupt(signum, frame):
 
 if __name__ == "__main__":
     parser = argparse.ArgumentParser(description=__doc__)
-    parser.add_argument("--cache-dir", type=Path, required=True)
+    parser.add_argument("--output-dir", type=Path, required=True, help="rattler-build's output directory")
+    parser.add_argument("--platform", required=True)
     parser.add_argument("--timeout", type=float, required=True, help="Build budget in seconds")
     parser.add_argument("command", nargs=argparse.REMAINDER)
     args = parser.parse_args()
     if args.timeout <= 0 or not args.command or args.command[0] != "--" or len(args.command) < 2:
         parser.error("provide a positive timeout and a command after --")
-    sys.exit(run(args.command[1:], args.cache_dir, args.timeout))
+    sys.exit(run(args.command[1:], cache_dirs(args.output_dir, args.platform), args.timeout))
diff --git a/tools/ci_config.py b/tools/ci_config.py
index 31c3ff031..de1b87f2a 100644
--- a/tools/ci_config.py
+++ b/tools/ci_config.py
@@ -30,9 +30,17 @@
 MARKER = ".ci-controls"
 
 
+def cache_dirs(output_dir: Path, platform: str) -> list[Path]:
+    """The cached package directories in rattler-build's output directory: the
+    platform's and noarch (its other contents, e.g. bld/ and src_cache/, are not
+    cached)."""
+    return [output_dir / platform, output_dir / "noarch"]
+
+
 def main() -> int:
     parser = argparse.ArgumentParser(description=__doc__.splitlines()[0])
-    parser.add_argument("--cache-dir", required=True, type=Path)
+    parser.add_argument("--output-dir", required=True, type=Path, help="rattler-build's output directory")
+    parser.add_argument("--platform", required=True)
     parser.add_argument("--config", default="ci.yaml", type=Path)
     parser.add_argument("--vinca", default="vinca.yaml", type=Path)
     args = parser.parse_args()
@@ -41,7 +49,12 @@ def main() -> int:
     if args.config.exists():
         config = yaml.safe_load(args.config.read_text()) or {}
     distro = yaml.safe_load(args.vinca.read_text())["ros_distro"]
-    cache = args.cache_dir
+    for cache in cache_dirs(args.output_dir, args.platform):
+        apply(cache, config, distro)
+    return 0
+
+
+def apply(cache: Path, config: dict, distro: str) -> None:
     controls = json.dumps({"full_rebuild": bool(config.get("full_rebuild", False)),
                            "evict_cache": [str(e) for e in config.get("evict_cache") or []]}, sort_keys=True)
     marker = cache / MARKER
@@ -50,11 +63,11 @@ def main() -> int:
         print(f"No cache directory {cache}; nothing to do.")
         cache.mkdir(parents=True)
         marker.write_text(controls)
-        return 0
+        return
 
     if marker.is_file() and marker.read_text() == controls:
         print("ci.yaml: controls already applied to this cache (a retry); keeping its packages.")
-        return 0
+        return
 
     if config.get("full_rebuild", False):
         print("ci.yaml: full_rebuild is set, ignoring the restored cache.")
@@ -64,7 +77,7 @@ def main() -> int:
             else:
                 child.unlink()
         marker.write_text(controls)
-        return 0
+        return
 
     for entry in config.get("evict_cache") or []:
         name = str(entry).replace("_", "-")
@@ -76,7 +89,6 @@ def main() -> int:
                 print(f"ci.yaml: evicting {path.name}")
                 path.unlink()
     marker.write_text(controls)
-    return 0
 
 
 if __name__ == "__main__":
diff --git a/tools/ci_estimate.py b/tools/ci_estimate.py
index 60eb5d2a5..46e5e6db5 100644
--- a/tools/ci_estimate.py
+++ b/tools/ci_estimate.py
@@ -1,6 +1,6 @@
 """How much a pull-request build still has to do, and roughly how long it takes.
 
-    python tools/ci_estimate.py --recipes distros/<d>/work/recipes --cache-dir <dir> --platform <p>
+    python tools/ci_estimate.py --recipes distros/<d>/work/recipes --output-dir <dir> --platform <p>
 
 A recipe makes one build per variant: per Python version for the packages with Python
 content, when the distribution pins several (build_timings.variant_builds). Builds whose
@@ -19,6 +19,7 @@
 from pathlib import Path
 
 import build_timings
+from ci_config import cache_dirs
 
 SECONDS = {  # platform: (per built package, per skipped package)
     "linux-64": (19, 2),
@@ -42,14 +43,15 @@ def duration(seconds: float) -> str:
 def main() -> int:
     parser = argparse.ArgumentParser(description=__doc__.splitlines()[0])
     parser.add_argument("--recipes", required=True, type=Path)
-    parser.add_argument("--cache-dir", required=True, type=Path)
+    parser.add_argument("--output-dir", required=True, type=Path, help="rattler-build's output directory")
     parser.add_argument("--platform", required=True)
     args = parser.parse_args()
 
     recipes = {p.name for p in args.recipes.iterdir() if (p / "recipe.yaml").is_file()} if args.recipes.is_dir() else set()
     variants = build_timings.variant_builds(args.recipes, args.platform) if recipes else {}
     builds = {r: variants.get(r, 1) for r in recipes}
-    cached = Counter(f.name.rsplit("-", 2)[0] for f in args.cache_dir.glob("*.conda")) if args.cache_dir.is_dir() else Counter()
+    cached = Counter(f.name.rsplit("-", 2)[0] for d in cache_dirs(args.output_dir, args.platform)
+                     for f in d.glob("*.conda"))
     to_build = {r: n - min(n, cached[r]) for r, n in builds.items() if n > cached[r]}
     skipped = sum(min(n, cached[r]) for r, n in builds.items())
     build, skip = SECONDS.get(args.platform, max(SECONDS.values()))
diff --git a/tools/maintenance.py b/tools/maintenance.py
index 8c0f81d49..7d4125006 100644
--- a/tools/maintenance.py
+++ b/tools/maintenance.py
@@ -100,31 +100,20 @@ def fold(title: str, body: list[str]) -> None:
     return "\n".join(lines)
 
 
-REPODATA_SUBDIRS = ("noarch", "linux-64", "linux-aarch64", "osx-64", "osx-arm64", "win-64")
+REPODATA_SUBDIRS = ("linux-64", "linux-aarch64", "osx-64", "osx-arm64", "win-64")  # get_channel_records adds noarch
 
 
 def released_builds(distro: str) -> dict[str, int] | None:
     """Highest build number of every package on the distribution's channel (all
     platforms), or None when the channel can't be read."""
-    import urllib.error
-    import urllib.request
+    from vinca.utils import get_channel_records
 
     base = rs.repodata_url(distro)
     builds: dict[str, int] = {}
-    read = False
     for subdir in REPODATA_SUBDIRS:
-        try:
-            request = urllib.request.Request(f"{base}/{subdir}/repodata.json", headers={"User-Agent": "robostack-bot"})
-            with urllib.request.urlopen(request, timeout=300) as response:
-                data = json.load(response)
-        except urllib.error.HTTPError as error:
-            if error.code == 404:
-                continue
-            raise
-        read = True
-        for record in [*data.get("packages", {}).values(), *data.get("packages.conda", {}).values()]:
+        for record in get_channel_records(base, subdir):
             builds[record["name"]] = max(builds.get(record["name"], 0), int(record.get("build_number", 0)))
-    return builds if read else None
+    return builds or None
 
 
 def released_build_number(distro: str, builds: dict[str, int] | None = None) -> int | None:
@@ -358,11 +347,12 @@ def rosdistro_syncs() -> list[dict]:
 
 
 def _newer(a: str, b: str) -> bool:
-    from packaging.version import InvalidVersion, Version
+    from rattler import Version
+    from rattler.exceptions import InvalidVersionError
 
     try:
         return Version(a) > Version(b)
-    except InvalidVersion:
+    except InvalidVersionError:
         return False
 
 
diff --git a/tools/package_tests.py b/tools/package_tests.py
index 675be12fb..ba4e350b3 100644
--- a/tools/package_tests.py
+++ b/tools/package_tests.py
@@ -21,6 +21,7 @@
 from __future__ import annotations
 
 import argparse
+import asyncio
 import json
 import os
 import re
@@ -30,9 +31,12 @@
 import sys
 import tempfile
 import time
-import urllib.request
 from pathlib import Path
 
+import rattler
+from rattler.package_streaming import download_to_path
+from vinca.utils import get_channel_records
+
 sys.path.insert(0, str(Path(__file__).resolve().parent))
 import robostack as rs
 
@@ -41,9 +45,6 @@
 REPORT_TITLE = "Package tests"
 # the issues of before, one per distribution: closed in favour of the one issue
 OLD_TITLE = re.compile(r"^\S+: package tests$")
-# packages.prefix.dev (where repo.prefix.dev redirects) answers Python-urllib's default
-# User-Agent with 403 Forbidden
-USER_AGENT = "robostack-package-tests"
 MAX_ISSUE_BODY = 60000  # GitHub's limit is 65536 characters
 LOG_TAIL = 60  # lines of a failed test's output kept in the results
 # a package's tests that run longer are stopped and reported as failed: a test that hangs
@@ -65,44 +66,21 @@ def tested_packages(distro: str) -> list[str]:
     return sorted(names)
 
 
-def request(url: str) -> urllib.request.Request:
-    return urllib.request.Request(url, headers={"User-Agent": USER_AGENT})
-
-
 def download(url: str, path: Path) -> None:
-    with urllib.request.urlopen(request(url), timeout=600) as response, path.open("wb") as fh:
-        shutil.copyfileobj(response, fh)
+    asyncio.run(download_to_path(rattler.Client(), url, path))
 
 
 def free_space(path: str) -> str:
     return f"{shutil.disk_usage(path).free / 2**30:.1f} GiB free"
 
 
-def fetch_json(url: str, attempts: int = 3) -> dict:
-    for attempt in range(1, attempts + 1):
-        try:
-            with urllib.request.urlopen(request(url), timeout=120) as response:
-                return json.load(response)
-        except urllib.error.HTTPError as error:
-            if error.code == 404:
-                return {}
-            if attempt == attempts:
-                raise
-        except OSError:
-            if attempt == attempts:
-                raise
-        time.sleep(10 * attempt)
-    return {}
-
-
-def newest_builds(repodata: dict, names: list[str]) -> list[dict]:
+def newest_builds(channel_records: list[dict], names: list[str]) -> list[dict]:
     """For each name, every variant of its newest build: the records with the version
     and build number of the newest upload (one per build string, e.g. per Python)."""
     records: dict[str, list[dict]] = {}
-    for section in ("packages", "packages.conda"):
-        for filename, record in (repodata.get(section) or {}).items():
-            if record.get("name") in names:
-                records.setdefault(record["name"], []).append({**record, "fn": filename})
+    for record in channel_records:
+        if record.get("name") in names:
+            records.setdefault(record["name"], []).append(record)
     selected = []
     for name in sorted(records):
         newest = max(records[name], key=lambda r: (r.get("build_number", 0), r.get("timestamp", 0)))
@@ -120,13 +98,10 @@ def newest_builds(repodata: dict, names: list[str]) -> list[dict]:
 def select(distro: str, platform: str) -> list[dict]:
     """The package files to test on this platform: {name, version, build, subdir, url}."""
     names = tested_packages(distro)
-    base = rs.repodata_url(distro)
     selected = []
-    for subdir in (platform, "noarch"):
-        repodata = fetch_json(f"{base}/{subdir}/repodata.json")
-        for record in newest_builds(repodata, names):
-            selected.append({"name": record["name"], "version": record["version"], "build": record["build"],
-                             "subdir": subdir, "url": f"{base}/{subdir}/{record['fn']}"})
+    for record in newest_builds(get_channel_records(rs.repodata_url(distro), platform), names):
+        selected.append({"name": record["name"], "version": record["version"], "build": record["build"],
+                         "subdir": record["subdir"], "url": record["url"]})
     return selected
 
 
@@ -196,7 +171,7 @@ def run(distro: str, platform: str, results: Path, only: list[str] | None = None
                     print(log, "\n❌ failed, trying again", flush=True)
                     ok, log, count = test_package(distro, package_file)
                     flaky = ok
-            except OSError as error:
+            except (OSError, RuntimeError) as error:  # rattler's download errors are RuntimeErrors
                 ok, log, count, flaky = False, f"download failed: {error}", 0, False
             finally:
                 package_file.unlink(missing_ok=True)
diff --git a/tools/python_abi_audit.py b/tools/python_abi_audit.py
new file mode 100644
index 000000000..1837a66be
--- /dev/null
+++ b/tools/python_abi_audit.py
@@ -0,0 +1,154 @@
+"""Check vinca's Python classification (conditional_python_dependency) against the
+published packages.
+
+    pixi run rs lyrical python-audit                 # linux-64, info/paths.json only
+    pixi run rs lyrical python-audit --elf           # also scan ELF files for libpython
+    pixi run rs lyrical python-audit --platform osx-arm64 --json audit.json
+
+A generated recipe (work/recipes) either has python in host, and is built for every
+Python of the distribution's pinning, or not, and is built once. This compares that
+with what the newest published build of each ros2-* package actually contains:
+
+- native: CPython extensions (*.cpython-*.so, *.pyd), rosidl_generator_py libraries,
+  or (--elf) ELF files that link libpython;
+- pure: only Python modules (site-packages);
+- none: no Python content.
+
+A recipe built once whose published package has Python content is a miss: that
+content would only work with the Python it happened to be built with. Misses make
+the exit status 1; fix them with `add_host: ["python"]` in patch/dependencies.yaml.
+Recipes built per Python without Python content in the package are only reported
+(an unneeded rebuild per Python, not a broken package).
+
+Run it before the switch to per-Python builds, while the channel still has the
+packages that were built with python in host (their content is complete).
+"""
+
+from __future__ import annotations
+
+import argparse
+import asyncio
+import json
+import re
+import sys
+from pathlib import Path
+
+import rattler
+import yaml
+from rattler.package_streaming import PackageArchive
+from vinca.utils import get_channel_records
+
+SITE_PACKAGES = re.compile(r"(^|/)(lib/python[0-9.]*/site-packages|Lib/site-packages)/")
+EXTENSION = re.compile(r"\.cpython-[^/]*\.(so|dylib)$|\.pyd$")
+CONCURRENCY = 16
+
+
+async def inspect(client: rattler.Client, url: str, elf: bool) -> dict:
+    """Classify by info/paths.json (read with range requests); with *elf*, the ELF
+    files of a package without Python files are searched for libpython (embedding)."""
+    for attempt in range(3):
+        try:
+            archive = await PackageArchive.from_url(client, url)
+            paths = [entry.relative_path.as_posix() for entry in (await archive.paths_json()).paths]
+            result = classify(paths, [])
+            if elf and result["content"] == "none":
+                linked = [entry.name async for entry in archive.stream("pkg")
+                          if entry.is_file and (data := await entry.read())[:4] == b"\x7fELF"
+                          and b"libpython3." in data]
+                result = classify(paths, linked)
+            return result
+        except Exception as err:  # noqa: BLE001 - network or archive trouble: retried, then reported
+            error = err
+    return {"content": "error", "error": str(error)}
+
+
+async def inspect_all(published: dict[str, dict], elf: bool) -> dict[str, dict]:
+    client = rattler.Client()
+    limit = asyncio.Semaphore(CONCURRENCY)
+
+    async def one(name: str, record: dict) -> tuple[str, dict]:
+        async with limit:
+            return name, {"file": record["fn"], **await inspect(client, record["url"], elf)}
+
+    return dict(await asyncio.gather(*(one(name, record) for name, record in published.items())))
+
+
+def classify(paths: list[str], linked: list[str]) -> dict:
+    site = [p for p in paths if SITE_PACKAGES.search(p)]
+    native = [p for p in paths if EXTENSION.search(p)]
+    native += [p for p in paths if "rosidl_generator_py" in p and re.search(r"\.(so|dylib|dll)$", p)]
+    native += linked
+    content = "native" if native else "pure" if site else "none"
+    return {"content": content, "examples": (native or site)[:3]}
+
+
+def flatten(requirements) -> list[str]:
+    out = []
+    for r in requirements or []:
+        if isinstance(r, dict):
+            out += flatten(r.get("then")) + flatten(r.get("else"))
+        else:
+            out.append(str(r))
+    return out
+
+
+def recipes_needing_python(recipes: Path) -> dict[str, bool]:
+    result = {}
+    for path in sorted(recipes.glob("ros2-*/recipe.yaml")):
+        recipe = yaml.safe_load(path.read_text())
+        host = flatten((recipe.get("requirements") or {}).get("host"))
+        result[recipe["package"]["name"]] = "python" in host
+    return result
+
+
+def newest_builds(records: list[dict]) -> dict[str, dict]:
+    newest: dict[str, tuple] = {}
+    for rec in records:
+        key = (rec["build_number"], rec.get("timestamp", 0))
+        if rec["name"].startswith("ros2-") and key > newest.get(rec["name"], ((-1, 0), None))[0]:
+            newest[rec["name"]] = (key, rec)
+    return {name: rec for name, (_, rec) in newest.items()}
+
+
+def main() -> int:
+    parser = argparse.ArgumentParser(description=__doc__, formatter_class=argparse.RawDescriptionHelpFormatter)
+    parser.add_argument("--channel", required=True, help="channel URL, e.g. https://prefix.dev/robostack-lyrical")
+    parser.add_argument("--platform", default="linux-64")
+    parser.add_argument("--recipes", default="recipes", type=Path, help="generated recipes (default: ./recipes)")
+    parser.add_argument("--elf", action="store_true",
+                        help="download the packages without Python files and look for libpython in their ELF files")
+    parser.add_argument("--json", type=Path, help="write the per-package results here")
+    args = parser.parse_args()
+
+    needs = recipes_needing_python(args.recipes)
+    if not needs:
+        print(f"No ros2-* recipes in {args.recipes}: run generate-recipes first", file=sys.stderr)
+        return 1
+    published = newest_builds(get_channel_records(args.channel, args.platform))
+    results = asyncio.run(inspect_all({n: published[n] for n in needs if n in published}, args.elf))
+
+    misses = sorted(n for n, r in results.items() if not needs[n] and r["content"] in ("native", "pure"))
+    unneeded = sorted(n for n, r in results.items() if needs[n] and r["content"] == "none")
+    errors = sorted(n for n, r in results.items() if r["content"] == "error")
+    counts: dict[tuple[bool, str], int] = {}
+    for n, r in results.items():
+        counts[(needs[n], r["content"])] = counts.get((needs[n], r["content"]), 0) + 1
+
+    print(f"{len(needs)} recipes, {len(results)} with a published {args.platform} package, "
+          f"{len(needs) - len(results)} unpublished")
+    for (per_python, content), count in sorted(counts.items()):
+        print(f"  {'per Python' if per_python else 'built once':10}  package content {content:7}  {count}")
+    for name in misses:
+        print(f"MISS {name}: built once, but ships {results[name]['content']} Python: {results[name]['examples']}")
+    if unneeded:
+        print(f"{len(unneeded)} recipes are built per Python without Python content: {', '.join(unneeded)}")
+    for name in errors:
+        print(f"ERROR {name}: {results[name]['error']}", file=sys.stderr)
+    if args.json:
+        args.json.write_text(json.dumps({n: {"per_python": needs[n], **r} for n, r in results.items()},
+                                        indent=1, sort_keys=True) + "\n")
+    return 1 if misses or errors else 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())
diff --git a/tools/robostack.py b/tools/robostack.py
index 96d2f4c67..d284ba5e5 100644
--- a/tools/robostack.py
+++ b/tools/robostack.py
@@ -441,7 +441,8 @@ def upload(distro: str, files: list[str], cwd: Path) -> int:
 
     def anaconda_upload() -> list[str] | None:
         # asked again before every attempt: an upload that timed out may still have
-        # arrived, and uploading it again fails with "already exists"
+        # arrived, or another platform's job uploaded the same noarch package, and
+        # uploading it again fails with "already exists"
         missing = [f for f in files if not on_anaconda(channel, Path(cwd, f))]
         return ["rattler-build", "upload", "anaconda", "-o", channel, "--api-key", token, *missing] if missing else None
 
@@ -550,6 +551,8 @@ def task(distro: str, name: str, args: list[str]) -> int:
         return run(py + [str(TOOLS / "check_dependency_compat.py"), *args], w)
     if name == "gap-report":
         return run(py + [str(TOOLS / "build_gap_report.py"), *args], w)
+    if name == "python-audit":
+        return run(py + [str(TOOLS / "python_abi_audit.py"), "--channel", repodata_url(distro), *args], w)
     if name in ("build", "build-one"):
         if not (w / "recipes").is_dir():
             print(f"No {(w / 'recipes').relative_to(ROOT)}: run `pixi run rs {distro} generate-recipes` first",
diff --git a/tools/tests/test_build_gap_report.py b/tools/tests/test_build_gap_report.py
new file mode 100644
index 000000000..e1623789d
--- /dev/null
+++ b/tools/tests/test_build_gap_report.py
@@ -0,0 +1,24 @@
+"""build_gap_report.py counts noarch artifacts for every platform."""
+
+import build_gap_report
+
+
+def test_noarch_artifacts_count_for_every_platform(tmp_path, monkeypatch, capsys):
+    recipes = tmp_path / "recipes"
+    for recipe in ("ros2-a", "ros2-b", "ros2-c"):
+        (recipes / recipe).mkdir(parents=True)
+    output = tmp_path / "output"
+    for subdir, package in (("linux-64", "ros2-a-1.0-h0_1"), ("osx-arm64", "ros2-c-1.0-h0_1"),
+                            ("noarch", "ros2-b-1.0-h0_1")):
+        (output / subdir).mkdir(parents=True)
+        (output / subdir / f"{package}.conda").write_text("")
+    monkeypatch.setattr("sys.argv", ["build_gap_report.py", "--output-dir", str(output), "--recipes-dir",
+                                     str(recipes), "--any-build-number"])
+
+    assert build_gap_report.main() == 0
+
+    report = capsys.readouterr().out
+    assert "Platform: noarch" not in report
+    linux, osx = report.split("Platform: linux-64")[1].split("Platform: osx-arm64")
+    assert "1 out of 3\n  - ros2-c\n" in linux
+    assert "1 out of 3\n  - ros2-a\n" in osx
diff --git a/tools/tests/test_build_timings.py b/tools/tests/test_build_timings.py
index a9edd28bb..64a74f07b 100644
--- a/tools/tests/test_build_timings.py
+++ b/tools/tests/test_build_timings.py
@@ -112,15 +112,17 @@ def test_ci_estimate_uses_the_measured_times(tmp_path, monkeypatch, capsys):
     for r in ("ros2-a", "ros-jazzy-a", "ros2-b", "ros2-new"):
         (recipes / r).mkdir(parents=True)
         (recipes / r / "recipe.yaml").write_text("")
-    cache = tmp_path / "cache"
-    cache.mkdir()
-    (cache / "ros2-b-1.0-h0_1.conda").write_text("")
+    output = tmp_path / "output"
+    (output / "linux-64").mkdir(parents=True)
+    (output / "linux-64" / "ros2-b-1.0-h0_1.conda").write_text("")
+    (output / "noarch").mkdir()
+    (output / "noarch" / "ros-jazzy-a-1.0-h0_1.conda").write_text("")
     monkeypatch.setenv("GITHUB_STEP_SUMMARY", "")
-    monkeypatch.setattr("sys.argv", ["ci_estimate.py", "--recipes", str(recipes), "--cache-dir", str(cache),
+    monkeypatch.setattr("sys.argv", ["ci_estimate.py", "--recipes", str(recipes), "--output-dir", str(output),
                                      "--platform", "linux-64"])
     assert ci_estimate.main() == 0
-    # ros2-a 150 s (average), its alias 0.3 s, ros2-new the median 80 s, ros2-b cached 2 s
-    assert capsys.readouterr().out.startswith("3 packages to build, 1 restored from the cache: roughly 4 min")
+    # ros2-a 150 s (average), ros2-new the median 80 s, ros2-b and the noarch alias cached 2 s each
+    assert capsys.readouterr().out.startswith("2 packages to build, 2 restored from the cache: roughly 4 min")
 
 
 def test_build_ci_parallel_times_each_build(tmp_path, monkeypatch, capsys):
@@ -236,13 +238,13 @@ def test_ci_estimate_counts_each_variant(tmp_path, monkeypatch, capsys):
         {"ros2-cpp": {"lyrical": 60.0}, "ros2-py": {"lyrical": 100.0}, "ros2-py-hdf5": {"lyrical": 10.0},
          "ros2-win-py": {"lyrical": 30.0}}))
     monkeypatch.setattr(build_timings, "TIMINGS", timings)
-    cache = tmp_path / "cache"
-    cache.mkdir()
+    cache = tmp_path / "output" / "linux-64"
+    cache.mkdir(parents=True)
     for f in ("ros2-py-1.0-py312h0_1.conda", "ros2-cpp-1.0-h0_1.conda"):
         (cache / f).write_text("")
     monkeypatch.setenv("GITHUB_STEP_SUMMARY", "")
-    monkeypatch.setattr("sys.argv", ["ci_estimate.py", "--recipes", str(recipes), "--cache-dir", str(cache),
-                                     "--platform", "linux-64"])
+    monkeypatch.setattr("sys.argv", ["ci_estimate.py", "--recipes", str(recipes), "--output-dir",
+                                     str(tmp_path / "output"), "--platform", "linux-64"])
     assert ci_estimate.main() == 0
     # ros2-py: 2 of 3 builds left, 200 s; ros2-py-hdf5 6 x 10 s; ros2-win-py 30 s; 2 cached x 2 s
     out = capsys.readouterr().out
diff --git a/tools/tests/test_ci_build.py b/tools/tests/test_ci_build.py
index 3c62f29bc..26dda8d07 100644
--- a/tools/tests/test_ci_build.py
+++ b/tools/tests/test_ci_build.py
@@ -14,21 +14,21 @@
 pytestmark = pytest.mark.skipif(os.name != "posix", reason="POSIX CI supervisor")
 
 
-def command(cache, timeout, script):
-    return [sys.executable, str(ROOT / "tools/ci_build.py"), "--cache-dir", str(cache),
+def command(output_dir, timeout, script):
+    return [sys.executable, str(ROOT / "tools/ci_build.py"), "--output-dir", str(output_dir), "--platform", "linux-64",
             "--timeout", str(timeout), "--", sys.executable, str(script)]
 
 
 @pytest.mark.parametrize("signum", [signal.SIGINT, signal.SIGTERM, None])
 def test_interruption_stops_descendants_and_preserves_only_finished_archives(tmp_path, signum):
-    cache = tmp_path / "packages"
+    cache = tmp_path / "linux-64"
     cache.mkdir()
     (cache / "restored.conda").write_text("cached")
     script = tmp_path / "build.py"
     # A descendant that ignores graceful termination and keeps modifying the output.
     script.write_text('''import os, signal, subprocess, sys, time
 from pathlib import Path
-cache = Path(sys.argv[0]).parent / "packages"
+cache = Path(sys.argv[0]).parent / "linux-64"
 (cache / "completed.conda").write_text("complete")
 print(f"Archive written to '{cache / 'completed.conda'}'", flush=True)
 for i in range(3):
@@ -47,7 +47,7 @@ def test_interruption_stops_descendants_and_preserves_only_finished_archives(tmp
 ''')
     output = tmp_path / "github-output"
     env = {**os.environ, "GITHUB_OUTPUT": str(output)}
-    proc = subprocess.Popen(command(cache, 2 if signum is None else 30, script), env=env,
+    proc = subprocess.Popen(command(tmp_path, 2 if signum is None else 30, script), env=env,
                             stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
     group = None
     try:
diff --git a/tools/tests/test_ci_config.py b/tools/tests/test_ci_config.py
new file mode 100644
index 000000000..1844851af
--- /dev/null
+++ b/tools/tests/test_ci_config.py
@@ -0,0 +1,50 @@
+"""ci_config.py applies ci.yaml's cache controls to the platform's and noarch packages."""
+
+import ci_config
+
+
+def _run(tmp_path, monkeypatch, output, ci_yaml=None):
+    config = tmp_path / "ci.yaml"
+    if ci_yaml is not None:
+        config.write_text(ci_yaml)
+    vinca = tmp_path / "vinca.yaml"
+    vinca.write_text("ros_distro: lyrical\n")
+    monkeypatch.setattr("sys.argv", ["ci_config.py", "--output-dir", str(output), "--platform", "linux-64",
+                                     "--config", str(config), "--vinca", str(vinca)])
+    assert ci_config.main() == 0
+
+
+def test_evicts_from_the_platform_and_noarch_caches(tmp_path, monkeypatch):
+    output = tmp_path / "output"
+    platform, noarch = output / "linux-64", output / "noarch"
+    for cache, package in ((platform, "ros2-foo-1.0-h0_1.conda"), (noarch, "ros-lyrical-foo-1.0-h0_1.conda")):
+        cache.mkdir(parents=True)
+        (cache / package).write_text("")
+        (cache / "ros2-bar-1.0-h0_1.conda").write_text("")
+
+    _run(tmp_path, monkeypatch, output, "evict_cache: [foo]\n")
+
+    for cache in (platform, noarch):
+        assert sorted(p.name for p in cache.iterdir()) == [".ci-controls", "ros2-bar-1.0-h0_1.conda"]
+
+
+def test_creates_a_missing_noarch_cache(tmp_path, monkeypatch):
+    output = tmp_path / "output"
+    (output / "linux-64").mkdir(parents=True)
+
+    _run(tmp_path, monkeypatch, output)
+
+    assert (output / "noarch" / ".ci-controls").is_file()
+
+
+def test_full_rebuild_keeps_the_rest_of_the_output_directory(tmp_path, monkeypatch):
+    output = tmp_path / "output"
+    for d in ("linux-64", "noarch", "bld"):
+        (output / d).mkdir(parents=True)
+        (output / d / "ros2-foo-1.0-h0_1.conda").write_text("")
+
+    _run(tmp_path, monkeypatch, output, "full_rebuild: true\n")
+
+    assert [p.name for p in (output / "linux-64").iterdir()] == [".ci-controls"]
+    assert [p.name for p in (output / "noarch").iterdir()] == [".ci-controls"]
+    assert (output / "bld" / "ros2-foo-1.0-h0_1.conda").is_file()
diff --git a/tools/tests/test_dependency_compat.py b/tools/tests/test_dependency_compat.py
new file mode 100644
index 000000000..cd465de99
--- /dev/null
+++ b/tools/tests/test_dependency_compat.py
@@ -0,0 +1,28 @@
+import pytest
+
+import abi_check
+from check_dependency_compat import constraint_compatible
+
+
+@pytest.mark.parametrize("constraint, pin, compatible", [
+    (">=1.88.0,<1.89.0a0", "1.88", True),
+    (">=1.88.0,<1.89.0a0", "1.90", False),
+    (">=3.12,<3.13.0a0", "3.12.*", True),
+    (">=11.2,<12", "11.*", True),
+    (">=2.0.2,<3", "2", True),
+    (">1.88,<1.89", "1.88", True),
+    ("<1.88.0a0", "1.88", False),
+    (">=1.86|>=2", "2", True),
+    ("==1.88.1", "1.88", True),
+    ("==1.88.1", "1.90", False),
+    ("~=1.88.1", "1.88", True),
+    ("", "1.88", True),
+    ("==1.88.1", "gcc", True),
+])
+def test_constraint_compatible(constraint, pin, compatible):
+    assert constraint_compatible(constraint, pin) is compatible
+
+
+def test_newest_orders_conda_versions():
+    versions = {v: {"version": v} for v in ("1.10.0", "1.9.2", "1.10.0rc1", "1.2")}
+    assert abi_check.newest(versions)["version"] == "1.10.0"
diff --git a/tools/tests/test_package_tests.py b/tools/tests/test_package_tests.py
index 4a18793b3..652e9b1fd 100644
--- a/tools/tests/test_package_tests.py
+++ b/tools/tests/test_package_tests.py
@@ -6,8 +6,8 @@
 import package_tests
 
 
-def record(name, version, build, number, timestamp=0):
-    return {"name": name, "version": version, "build": build, "build_number": number, "timestamp": timestamp}
+def record(fn, name, version, build, number, timestamp=0):
+    return {"fn": fn, "name": name, "version": version, "build": build, "build_number": number, "timestamp": timestamp}
 
 
 def test_tested_packages_are_the_test_files(tmp_path, monkeypatch):
@@ -23,24 +23,37 @@ def test_tested_packages_are_the_test_files(tmp_path, monkeypatch):
 
 
 def test_newest_builds_keeps_every_variant_of_the_newest_build():
-    repodata = {
-        "packages.conda": {
-            "a-1-py312_25.conda": record("ros2-a", "1", "py312_25", 25, 1),
-            "a-1-py314_27.conda": record("ros2-a", "1", "py314_27", 27, 2),
-            "a-1-py313_27.conda": record("ros2-a", "1", "py313_27", 27, 3),
-            "b-2-h1_3.conda": record("ros2-b", "2", "h1_3", 3),
-            "c-1-h_1.conda": record("ros2-untested", "1", "h_1", 1),
-        },
+    records = [
+        record("a-1-py312_25.conda", "ros2-a", "1", "py312_25", 25, 1),
+        record("a-1-py314_27.conda", "ros2-a", "1", "py314_27", 27, 2),
         # the same build in the old format too: the .conda one is tested
-        "packages": {"a-1-py314_27.tar.bz2": record("ros2-a", "1", "py314_27", 27, 2)},
-    }
-    selected = package_tests.newest_builds(repodata, ["ros2-a", "ros2-b"])
+        record("a-1-py314_27.tar.bz2", "ros2-a", "1", "py314_27", 27, 2),
+        record("a-1-py313_27.conda", "ros2-a", "1", "py313_27", 27, 3),
+        record("b-2-h1_3.conda", "ros2-b", "2", "h1_3", 3),
+        record("c-1-h_1.conda", "ros2-untested", "1", "h_1", 1),
+    ]
+    selected = package_tests.newest_builds(records, ["ros2-a", "ros2-b"])
     assert [(r["name"], r["build"], r["fn"]) for r in selected] == [
         ("ros2-a", "py313_27", "a-1-py313_27.conda"),
         ("ros2-a", "py314_27", "a-1-py314_27.conda"),
         ("ros2-b", "h1_3", "b-2-h1_3.conda"),
     ]
-    assert package_tests.newest_builds({}, ["ros2-a"]) == []
+    assert package_tests.newest_builds([], ["ros2-a"]) == []
+
+
+def test_select_reads_the_platform_and_noarch_once(monkeypatch):
+    calls = []
+
+    def get_channel_records(channel, platform):
+        calls.append((channel, platform))
+        return [{**record("a-1-h_3.conda", "ros2-a", "1", "h_3", 3), "subdir": "linux-64", "url": "u/a"},
+                {**record("b-1-h_3.conda", "ros-jazzy-b", "1", "h_3", 3), "subdir": "noarch", "url": "u/b"}]
+
+    monkeypatch.setattr(package_tests, "get_channel_records", get_channel_records)
+    monkeypatch.setattr(package_tests, "tested_packages", lambda distro: ["ros-jazzy-b", "ros2-a"])
+    assert [(p["name"], p["subdir"], p["url"]) for p in package_tests.select("jazzy", "linux-64")] == [
+        ("ros-jazzy-b", "noarch", "u/b"), ("ros2-a", "linux-64", "u/a")]
+    assert calls == [(package_tests.rs.repodata_url("jazzy"), "linux-64")]
 
 
 def test_ran_test_counts_the_tests_rattler_build_ran():
@@ -109,11 +122,6 @@ def gh(args):
     assert closed == [["api", "-X", "PATCH", "repos/o/r/issues/149", "-f", "state=closed", "-f", "state_reason=not_planned"]]
 
 
-def test_requests_send_a_user_agent():
-    # packages.prefix.dev answers Python-urllib's default User-Agent with 403
-    assert package_tests.request("https://repo.prefix.dev/x").get_header("User-agent") == package_tests.USER_AGENT
-
-
 def test_a_test_that_hangs_is_stopped_and_failed(monkeypatch):
     # the test leaves a process behind that ignores SIGTERM and keeps the output open,
     # like a node the test didn't stop: the whole process group is killed at the timeout
diff --git a/tools/tests/test_python_abi_audit.py b/tools/tests/test_python_abi_audit.py
new file mode 100644
index 000000000..2ec720d8c
--- /dev/null
+++ b/tools/tests/test_python_abi_audit.py
@@ -0,0 +1,30 @@
+import python_abi_audit as audit
+
+
+def test_classify_by_package_content():
+    assert audit.classify(["share/a/package.xml", "share/a/launch/__pycache__/x.cpython-314.pyc"], [])["content"] == "none"
+    assert audit.classify(["lib/python3.14/site-packages/a/__init__.py"], [])["content"] == "pure"
+    assert audit.classify(["lib/python/site-packages/a/__init__.py"], [])["content"] == "pure"
+    assert audit.classify(["Lib/site-packages/a/__init__.py"], [])["content"] == "pure"
+    assert audit.classify(["lib/a/_a.cpython-314-x86_64-linux-gnu.so"], [])["content"] == "native"
+    assert audit.classify(["Lib/site-packages/a/_a.cp314-win_amd64.pyd"], [])["content"] == "native"
+    assert audit.classify(["lib/liba_msgs__rosidl_generator_py.so"], [])["content"] == "native"
+    assert audit.classify(["lib/a/node"], ["lib/a/node"])["content"] == "native"
+
+
+def test_recipes_needing_python_reads_host(tmp_path):
+    for name, host in (("ros2-a", "[{if: unix, then: [python]}, ros2-b]"),
+                       ("ros2-b", "[\"python ${{ python_min }}.*\"]"),
+                       ("ros-lyrical-a", "[python]")):
+        (tmp_path / name).mkdir()
+        (tmp_path / name / "recipe.yaml").write_text(f"package: {{name: {name}}}\nrequirements:\n  host: {host}\n")
+    assert audit.recipes_needing_python(tmp_path) == {"ros2-a": True, "ros2-b": False}
+
+
+def test_newest_builds_takes_the_highest_build_number():
+    def rec(fn, name, number, timestamp=0):
+        return {"fn": fn, "name": name, "build_number": number, "timestamp": timestamp}
+
+    records = [rec("a-1-h_30.conda", "ros2-a", 30), rec("a-1-h_29.conda", "ros2-a", 29, 9),
+               rec("a-1-g_30.conda", "ros2-a", 30, 5), rec("x.conda", "ros-lyrical-a", 31)]
+    assert {name: r["fn"] for name, r in audit.newest_builds(records).items()} == {"ros2-a": "a-1-g_30.conda"}
diff --git a/tools/tests/test_upload.py b/tools/tests/test_upload.py
index 2ee2c4e08..9e3f62ce3 100644
--- a/tools/tests/test_upload.py
+++ b/tools/tests/test_upload.py
@@ -55,3 +55,19 @@ def test_anaconda_only(calls, monkeypatch):
     monkeypatch.setattr(rs, "on_anaconda", lambda channel, package: False)
     assert rs.upload("humble", ["linux-64/a-1-0.conda"], Path(".")) == 0
     assert [c[2] for c in calls] == ["anaconda"] and calls[0][4] == "robostack-humble"
+
+
+def test_on_anaconda_looks_up_noarch_packages_in_noarch(monkeypatch):
+    import urllib.error
+    import urllib.request
+
+    urls = []
+
+    def urlopen(request, timeout):
+        urls.append(request.full_url)
+        raise urllib.error.HTTPError(request.full_url, 404, "Not Found", {}, None)
+
+    monkeypatch.setattr(urllib.request, "urlopen", urlopen)
+    assert rs.on_anaconda("robostack-lyrical", Path("out/noarch/ros-lyrical-a-1.0.0-h0_31.conda")) is False
+    assert urls == ["https://api.anaconda.org/dist/robostack-lyrical/ros-lyrical-a/1.0.0/noarch/"
+                    "ros-lyrical-a-1.0.0-h0_31.conda"]