diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c5604e4..b7b74a7 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -2,22 +2,22 @@ name: CI / build
 on:
   pull_request:
   push:
-    branches: [main]
+    branches: [ main ]
 jobs:
   python:
+    name: python (${{ matrix.python-version }})
     runs-on: ubuntu-latest
     strategy:
-      matrix:
-        python-version: ["3.11","3.12"]
+      matrix: { python-version: ["3.11","3.12"] }
     steps:
       - uses: actions/checkout@v5
       - uses: actions/setup-python@v5
-        with:
-          python-version: ${{ matrix.python-version }}
+        with: { python-version: ${{ matrix.python-version }} }
       - run: python -m pip install -U pip
-      - run: pip install poetry
-      - run: poetry install --no-interaction
-      - run: poetry run ruff check .
-      - run: poetry run black --check .
-      - run: PYTHONPATH=src poetry run pytest -q
-      - run: poetry run mypy src
+      - run: pip install pytest mypy ruff black
+      - run: ruff check .
+      - run: black --check .
+      - run: pytest -q
+      - name: mypy (solo 3.12)
+        if: matrix.python-version == '3.12'
+        run: mypy src
diff --git a/src/diff_risk_dashboard/cli.py b/src/diff_risk_dashboard/cli.py
index 0085bf1..323264e 100644
--- a/src/diff_risk_dashboard/cli.py
+++ b/src/diff_risk_dashboard/cli.py
@@ -3,39 +3,59 @@
 import argparse
 import json
 import sys
+from collections.abc import Mapping
 from pathlib import Path
-
-from .core import Summary, summarize
-
-
-def _print_table(summary: Summary) -> None:
-    bs = summary["by_severity"]
-    rows = [
-        ("CRITICAL", bs["CRITICAL"]),
-        ("HIGH", bs["HIGH"]),
-        ("MEDIUM", bs["MEDIUM"]),
-        ("LOW", bs["LOW"]),
-        ("INFO", bs["INFO"]),
-    ]
-    print("\n=== Diff Risk Summary ===")
-    print(f"Total findings: {summary['total']}")
-    print("Severity counts:")
-    w = max(len(r[0]) for r in rows)
-    for name, cnt in rows:
-        print(f"  {name:<{w}} : {cnt}")
-    print(f"Worst severity : {summary['worst']}")
-    print(f"Risk level     : {summary['risk_level']}\n")
-
-
-def main(argv: list[str] | None = None) -> int:
-    p = argparse.ArgumentParser(description="Diff Risk Dashboard (APV JSON -> summary)")
-    p.add_argument("apv_json", help="Path to ai-patch-verifier JSON")
-    args = p.parse_args(argv)
-    data = json.loads(Path(args.apv_json).read_text(encoding="utf-8"))
-    sm = summarize(data)
-    _print_table(sm)
-    return 2 if sm["risk_level"] == "red" else (1 if sm["risk_level"] == "yellow" else 0)
-
-
-if __name__ == "__main__":
-    sys.exit(main())
+from typing import Any
+
+from .core import summarize_apv_json
+from .report import to_markdown
+
+
+def _exit_code(risk: str) -> int:
+    return {"green": 0, "yellow": 1, "red": 2}.get(risk, 0)
+
+
+def _print_table(summary: Mapping[str, Any]) -> None:
+    by = summary.get("by_severity", {}) or {}
+    print("Severity\tCount")
+    for sev in ["CRITICAL", "HIGH", "MEDIUM", "LOW", "INFO"]:
+        print(f"{sev}\t{by.get(sev, by.get(sev.lower(), 0))}")
+    print(f"TOTAL\t{summary.get('total', 0)}")
+
+
+def main() -> int:
+    p = argparse.ArgumentParser(
+        prog="diff_risk_dashboard", description="Diff Risk Dashboard (APV JSON -> summary)"
+    )
+    p.add_argument("input", help="Path o texto JSON de ai-patch-verifier")
+    p.add_argument(
+        "-f", "--format", choices=["table", "json", "md"], default="table", help="Formato de salida"
+    )
+    p.add_argument("-o", "--output", default="-", help="Archivo de salida; '-' = stdout")
+    p.add_argument(
+        "--no-exit-by-risk", action="store_true", help="No ajustar el exit code por nivel de riesgo"
+    )
+    args = p.parse_args()
+
+    summary: Mapping[str, Any] = summarize_apv_json(args.input)
+    out: str | None = None
+    if args.format == "json":
+        out = json.dumps(summary, indent=2)
+    elif args.format == "md":
+        out = to_markdown(summary)
+    else:
+        _print_table(summary)
+
+    if out is not None:
+        if args.output == "-":
+            print(out)
+        else:
+            Path(args.output).write_text(out, encoding="utf-8")
+            print(f"Wrote {args.output}", file=sys.stderr)
+
+    risk = str(summary.get("risk", summary.get("risk_level", "green")))
+    return 0 if args.no_exit_by_risk else _exit_code(risk)
+
+
+if __name__ == "__main__":  # pragma: no cover
+    raise SystemExit(main())
diff --git a/src/diff_risk_dashboard/report.py b/src/diff_risk_dashboard/report.py
new file mode 100644
index 0000000..c536ff5
--- /dev/null
+++ b/src/diff_risk_dashboard/report.py
@@ -0,0 +1,33 @@
+from __future__ import annotations
+
+from collections.abc import Mapping
+from typing import Any
+
+_SEVERITIES = ["CRITICAL", "HIGH", "MEDIUM", "LOW", "INFO"]
+
+
+def _get_counts(summary: Mapping[str, Any]) -> dict[str, int]:
+    counts: dict[str, int] = {}
+    by = summary.get("by_severity", {}) or {}
+    if isinstance(by, Mapping):
+        for sev in _SEVERITIES:
+            counts[sev] = int(by.get(sev, by.get(sev.lower(), 0)) or 0)
+    return counts
+
+
+def to_markdown(summary: Mapping[str, Any]) -> str:
+    counts = _get_counts(summary)
+    total = int(summary.get("total", 0) or 0)
+    worst = str(summary.get("worst", "INFO") or "INFO").upper()
+    risk = str(summary.get("risk", summary.get("risk_level", "green")) or "green").lower()
+    emoji = {"red": "🔴", "yellow": "🟡", "green": "🟢"}.get(risk, "🟢")
+    lines = [
+        f"# Diff Risk Dashboard {emoji} — Worst: **{worst}**",
+        "",
+        "| Severity | Count |",
+        "|---|---:|",
+    ]
+    for sev in _SEVERITIES:
+        lines.append(f"| {sev} | {counts.get(sev, 0)} |")
+    lines += [f"| **TOTAL** | **{total}** |", "", "> Generated by diff-risk-dashboard CLI"]
+    return "\n".join(lines)