diff --git a/AGENTS.md b/AGENTS.md
index 711f699..8a014cf 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -3,3 +3,5 @@
 - For repositories on `git.seimel.app`, use the existing Tea/Gitea token from `~/.config/tea/config.yml` for authenticated `git push`/`git fetch` operations.
 - Do not print, log, or expose the token.
 - Prefer token-authenticated HTTPS over unauthenticated HTTPS or SSH when pushing to `git.seimel.app`.
+- Python is forbidden for this project. Public workflow code and documentation must use R, Julia, Stan, and shell only; do not add Python scripts or Python references.
+- `data-setup/run_data_setup.sh` is intentionally a no-option public entry point. It downloads script-accessible sources, checks local raw files, rebuilds generated inputs under `_local/`, compares them to committed `data/`, and never replaces committed inputs automatically.
diff --git a/data-setup/README.md b/data-setup/README.md
index eb447ce..70b316c 100644
--- a/data-setup/README.md
+++ b/data-setup/README.md
@@ -55,25 +55,10 @@ Run the full source-data setup workflow with:
 bash data-setup/run_data_setup.sh
 ```
 
-Maintenance options:
-
-- `--dry-run` — check setup scripts only.
-- `--download-only` — download script-accessible sources.
-- `--build-test` — rebuild model-ready inputs from existing local sources.
-- `--compare` — compare regenerated inputs with committed `data/` inputs.
-- no option — download, rebuild, and compare locally.
-
-Minimal check:
-
-```bash
-bash data-setup/run_data_setup.sh --dry-run
-```
-
-Download sources:
-
-```bash
-bash data-setup/run_data_setup.sh --download-only
-```
+The command downloads script-accessible sources, checks required local files,
+rebuilds model-ready inputs under `_local/generated-inputs/`, and writes a
+comparison report under `_local/reports/`. It never replaces committed files in
+`data/`.
 
 V-Party:
 
@@ -96,24 +81,6 @@ Morgan is not a public provider download. The local OCR/transcription file can b
 _local/raw/morgan/morgan_positions_raw.csv
 ```
 
-Rebuild model-ready inputs:
-
-```bash
-bash data-setup/run_data_setup.sh --build-test
-```
-
-Compare regenerated inputs:
-
-```bash
-bash data-setup/run_data_setup.sh --compare
-```
-
-Full local source test:
-
-```bash
-bash data-setup/run_data_setup.sh
-```
-
 The comparison writes `_local/reports/input_comparison.md`. Replacing committed inputs, if ever needed, is a separate manual decision and is not done by these scripts.
 
 Known behavior: the current public/rebuilt sources run through the workflow successfully, but regenerated `text_data.csv`, `expert.csv`, and `lr_data.csv` are not byte-identical to the committed model-ready inputs because of source-version and linkage differences. The comparison report records those differences explicitly.
diff --git a/data-setup/run_data_setup.sh b/data-setup/run_data_setup.sh
index 2d38a28..ca63099 100644
--- a/data-setup/run_data_setup.sh
+++ b/data-setup/run_data_setup.sh
@@ -4,32 +4,17 @@ set -euo pipefail
 usage() {
   cat >&2 <<'EOF'
 Usage: bash data-setup/run_data_setup.sh
-
-Optional maintenance modes:
-  --dry-run        check setup scripts only
-  --download-only  download source files where scriptable
-  --build-test     rebuild inputs from existing local sources
-  --compare        compare regenerated inputs with committed data/
 EOF
 }
 
-if [ "$#" -gt 1 ]; then
+if [ "$#" -ne 0 ]; then
   usage
   exit 1
 fi
 
-MODE="${1:---full-test}"
 repo_root="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd -P)"
 cd "$repo_root"
 
-case "$MODE" in
-  --dry-run|--download-only|--build-test|--compare|--full-test) ;;
-  *)
-    usage
-    exit 1
-    ;;
-esac
-
 export PARTY2D_RAW_DATA_DIR="${PARTY2D_RAW_DATA_DIR:-$repo_root/_local/raw}"
 export PARTY2D_BUILD_DIR="${PARTY2D_BUILD_DIR:-$repo_root/_local/build}"
 export PARTY2D_GENERATED_INPUT_DIR="${PARTY2D_GENERATED_INPUT_DIR:-$repo_root/_local/generated-inputs}"
@@ -37,35 +22,13 @@ export PARTY2D_REPORT_DIR="${PARTY2D_REPORT_DIR:-$repo_root/_local/reports}"
 export R_LIBS_USER="${R_LIBS_USER:-$repo_root/_local/R/library}"
 mkdir -p "$R_LIBS_USER"
 
-if [ "$MODE" = "--dry-run" ]; then
-  echo "Checking data-setup scripts only; no downloads and no rebuild."
-  command -v bash >/dev/null
-  command -v Rscript >/dev/null
-  bash -n data-setup/check_raw_data.sh
-  Rscript -e 'files <- list.files("data-setup/R", pattern="\\.R$", full.names=TRUE); invisible(lapply(files, parse)); cat("R setup scripts parse OK\n")'
-  echo "Data setup dry run passed."
-  exit 0
-fi
-
-if [ "$MODE" = "--compare" ]; then
-  Rscript data-setup/R/03_compare_generated_inputs.R
-  exit 0
-fi
-
-if [ "$MODE" = "--download-only" ]; then
-  Rscript data-setup/R/00_install_dependencies.R
-  Rscript data-setup/R/01_download_sources.R
-  exit 0
-fi
-
-if [ "$MODE" = "--full-test" ]; then
-  Rscript data-setup/R/00_install_dependencies.R
-  Rscript data-setup/R/01_download_sources.R || true
-fi
-
+command -v bash >/dev/null
+command -v Rscript >/dev/null
+bash -n data-setup/check_raw_data.sh
+Rscript data-setup/R/00_install_dependencies.R
+Rscript data-setup/R/01_download_sources.R || true
 bash data-setup/check_raw_data.sh
 rm -rf "$PARTY2D_BUILD_DIR" "$PARTY2D_GENERATED_INPUT_DIR"
 mkdir -p "$PARTY2D_BUILD_DIR" "$PARTY2D_GENERATED_INPUT_DIR"
-Rscript data-setup/R/00_install_dependencies.R
 Rscript data-setup/R/02_build_model_inputs.R
 Rscript data-setup/R/03_compare_generated_inputs.R
diff --git a/docs/RAW_DATA_SOURCES.md b/docs/RAW_DATA_SOURCES.md
index 57c5cd4..61876d4 100644
--- a/docs/RAW_DATA_SOURCES.md
+++ b/docs/RAW_DATA_SOURCES.md
@@ -61,21 +61,15 @@ Observed checksum after download on 2026-06-11:
 sha256  2cd8c9108b1b0b9c1b6594bb21acee709c70259cd02f450bc69fc09b505fc9fb
 ```
 
-## Preflight check
+## Local source check and rebuild
 
-From the repository root, run:
-
-```bash
-bash data-setup/run_data_setup.sh --dry-run
-```
-
-To check local raw file placement and print byte sizes/checksums, run:
+To check local raw file placement and print byte sizes/checksums directly, run:
 
 ```bash
 bash data-setup/check_raw_data.sh
 ```
 
-After restricted/manual files are in place, run the full local rebuild and comparison test with:
+Run the full source-data setup, rebuild, and comparison test with:
 
 ```bash
 bash data-setup/run_data_setup.sh