diff --git a/README.md b/README.md
index 005e14b..a6453be 100644
--- a/README.md
+++ b/README.md
@@ -162,6 +162,10 @@ To generate the tool-expansion review artifacts in one command:
 bash demo/run-tool-expansion-review.sh
 ```
 
+See [`docs/tutorials/tool-expansion-quality-gate.md`](docs/tutorials/tool-expansion-quality-gate.md)
+for the quality-gate flow and [`docs/promo/social-hooks.md`](docs/promo/social-hooks.md)
+for grounded launch copy.
+
 ## Development
 
 ```bash
diff --git a/demo/run-tool-expansion-review.sh b/demo/run-tool-expansion-review.sh
index 33d326e..7d5f938 100755
--- a/demo/run-tool-expansion-review.sh
+++ b/demo/run-tool-expansion-review.sh
@@ -1,58 +1,41 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
-ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
-OUT_DIR="${TMPDIR:-/tmp}/promptdiff-tool-expansion-demo"
-MARKDOWN_REPORT="$OUT_DIR/tool-expansion-report.md"
-JSON_REPORT="$OUT_DIR/tool-expansion-report.json"
-RULES_REPORT="$OUT_DIR/rules-check.md"
+repo_root="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+cd "$repo_root"
 
-rm -rf "$OUT_DIR"
-mkdir -p "$OUT_DIR"
+npm run build >/dev/null
 
-npm --prefix "$ROOT_DIR" run build >/dev/null
+rm -rf .tmp/promptdiff-demo
+mkdir -p .tmp/promptdiff-demo
 
-set +e
-node "$ROOT_DIR/dist/cli.js" compare \
-  "$ROOT_DIR/examples/prompts/tool-expansion-old.md" \
-  "$ROOT_DIR/examples/prompts/tool-expansion-new.md" \
-  --out "$MARKDOWN_REPORT"
-markdown_status=$?
-
-node "$ROOT_DIR/dist/cli.js" compare \
-  "$ROOT_DIR/examples/prompts/tool-expansion-old.md" \
-  "$ROOT_DIR/examples/prompts/tool-expansion-new.md" \
+node dist/cli.js compare \
+  examples/prompts/tool-expansion-old.md \
+  examples/prompts/tool-expansion-new.md \
+  --out .tmp/promptdiff-demo/tool-expansion.md
+
+node dist/cli.js compare \
+  examples/prompts/tool-expansion-old.md \
+  examples/prompts/tool-expansion-new.md \
   --format json \
-  --out "$JSON_REPORT"
-json_status=$?
+  --out .tmp/promptdiff-demo/tool-expansion.json
+
+set +e
+node dist/cli.js check examples/prompts/*.md --rules examples/rules.json --fail-on high \
+  --out .tmp/promptdiff-demo/rules-check.md
+gate_code=$?
 set -e
 
-if [ "$markdown_status" -ne 0 ] && [ "$markdown_status" -ne 2 ]; then
-  echo "promptdiff compare failed with exit code $markdown_status" >&2
-  exit "$markdown_status"
+if [ "$gate_code" -ne 2 ]; then
+  printf 'expected rules quality gate to exit 2, got %s\n' "$gate_code" >&2
+  exit 1
 fi
 
-if [ "$json_status" -ne 0 ] && [ "$json_status" -ne 2 ]; then
-  echo "promptdiff JSON compare failed with exit code $json_status" >&2
-  exit "$json_status"
-fi
+grep -q "Tool" .tmp/promptdiff-demo/tool-expansion.md
+grep -q "highestSeverity" .tmp/promptdiff-demo/tool-expansion.json
+grep -q "PromptDiff" .tmp/promptdiff-demo/rules-check.md
+node -e "const fs=require('node:fs'); const report=JSON.parse(fs.readFileSync('.tmp/promptdiff-demo/tool-expansion.json','utf8')); if (!report.summary || !Array.isArray(report.findings)) process.exit(1);"
 
-node "$ROOT_DIR/dist/cli.js" check \
-  "$ROOT_DIR/examples/prompts/safe.md" \
-  --rules "$ROOT_DIR/examples/rules.json" \
-  --out "$RULES_REPORT"
-
-test -s "$MARKDOWN_REPORT"
-test -s "$JSON_REPORT"
-test -s "$RULES_REPORT"
-grep -q "Tool surface changed" "$MARKDOWN_REPORT"
-grep -q '"highestSeverity": "critical"' "$JSON_REPORT"
-grep -q "PromptDiff Rules Check" "$RULES_REPORT"
-node -e "const fs=require('node:fs'); const report=JSON.parse(fs.readFileSync(process.argv[1],'utf8')); if (!report.summary || !Array.isArray(report.findings)) process.exit(1);" "$JSON_REPORT"
-
-echo "Markdown report: $MARKDOWN_REPORT"
-echo "JSON report: $JSON_REPORT"
-echo "Rules report: $RULES_REPORT"
-echo "Expected compare Markdown exit: $markdown_status"
-echo "Expected compare JSON exit: $json_status"
-find "$OUT_DIR" -maxdepth 1 -type f -print | sort
+printf 'Markdown report: .tmp/promptdiff-demo/tool-expansion.md\n'
+printf 'JSON report: .tmp/promptdiff-demo/tool-expansion.json\n'
+printf 'Rules report: .tmp/promptdiff-demo/rules-check.md\n'
diff --git a/docs/promo/social-hooks.md b/docs/promo/social-hooks.md
index d61dc21..28c759c 100644
--- a/docs/promo/social-hooks.md
+++ b/docs/promo/social-hooks.md
@@ -1,26 +1,26 @@
-# Social Hooks
+# PromptDiff Promotion Hooks
 
-These drafts are grounded in the current README, examples, and CLI behavior.
+## Grounded facts
 
-## Prompt Tool Review
+- PromptDiff compares prompt revisions from local files.
+- It emits Markdown or JSON reports.
+- It redacts common secret-like values by default.
+- It includes a `check` command backed by a JSON rules file.
+- It is deterministic and heuristic, not an LLM judge.
 
-Prompt edits can quietly change tool access, safety language, and output contracts.
+## Short posts
 
-PromptDiff gives those changes names in a local Markdown or JSON report, so reviewers can discuss the actual risk instead of eyeballing a wall of text.
+1. Prompt changes can expand tool access without looking dramatic. PromptDiff
+   turns that revision into a local review artifact.
+2. Treat prompts like code: compare revisions, name risky categories, and keep
+   a Markdown report with the PR.
+3. Demo angle: old support prompt, new tool-expanded prompt, one report showing
+   what changed and one rules gate that exits non-zero.
 
-Demo: compare `examples/prompts/tool-expansion-old.md` with `examples/prompts/tool-expansion-new.md`.
+## Video outline
 
-## CI Angle
-
-PromptDiff has two useful modes:
-
-- `compare` for prompt revision reports
-- `check` for required phrases, forbidden phrases, and section rules
-
-It is deterministic, local-first, and built for review evidence rather than scoring prompts with another model.
-
-## Limitation-Aware Post
-
-PromptDiff is not an LLM judge and does not claim to understand every semantic change.
-
-That is the point: it catches concrete review signals such as risky instruction language, removed guardrails, tool references, output-contract shifts, and secret-like values.
+1. Open `examples/prompts/tool-expansion-old.md`.
+2. Open `examples/prompts/tool-expansion-new.md`.
+3. Run `bash demo/run-tool-expansion-review.sh`.
+4. Show `.tmp/promptdiff-demo/tool-expansion.md`.
+5. Show the expected quality-gate exit behavior from the script.
diff --git a/docs/tutorials/tool-expansion-quality-gate.md b/docs/tutorials/tool-expansion-quality-gate.md
new file mode 100644
index 0000000..040de64
--- /dev/null
+++ b/docs/tutorials/tool-expansion-quality-gate.md
@@ -0,0 +1,54 @@
+# Tool Expansion Quality Gate Demo
+
+This walkthrough creates reviewer-facing artifacts for a prompt change that
+expands tool language and then runs the checked-in rules gate.
+
+## Build the CLI
+
+```sh
+npm run build
+```
+
+## Compare the prompt revision
+
+```sh
+node dist/cli.js compare \
+  examples/prompts/tool-expansion-old.md \
+  examples/prompts/tool-expansion-new.md \
+  --out .tmp/promptdiff-demo/tool-expansion.md
+```
+
+Write JSON for automation:
+
+```sh
+node dist/cli.js compare \
+  examples/prompts/tool-expansion-old.md \
+  examples/prompts/tool-expansion-new.md \
+  --format json \
+  --out .tmp/promptdiff-demo/tool-expansion.json
+```
+
+## Run the rules gate
+
+```sh
+node dist/cli.js check examples/prompts/*.md --rules examples/rules.json --fail-on high \
+  --out .tmp/promptdiff-demo/rules-check.md
+```
+
+Exit code `2` means the configured prompt quality gate failed. In this demo,
+that is expected evidence for the risky fixture set, not a runtime error.
+
+## One-command demo
+
+```sh
+bash demo/run-tool-expansion-review.sh
+```
+
+The script writes Markdown and JSON artifacts, verifies expected report text,
+and confirms the rules gate exits with code `2`.
+
+## Boundaries
+
+- PromptDiff is deterministic and heuristic; it is not an LLM judge.
+- Reports are review artifacts, not final safety decisions.
+- Do not claim hosted scanning, telemetry, or network behavior.