diff --git a/strix/config/config.py b/strix/config/config.py
index 782101dd..4593452a 100644
--- a/strix/config/config.py
+++ b/strix/config/config.py
@@ -53,6 +53,10 @@ class Config:
     traceloop_api_key = None
     traceloop_headers = None
 
+    # Webhook
+    strix_webhook_url: str | None = None
+    strix_webhook_format = "generic"
+
     # Config file override (set via --config CLI arg)
     _config_file_override: Path | None = None
 
diff --git a/strix/interface/webhooks.py b/strix/interface/webhooks.py
new file mode 100644
index 00000000..bcf18c6e
--- /dev/null
+++ b/strix/interface/webhooks.py
@@ -0,0 +1,255 @@
+"""Webhook dispatcher for scan completion notifications.
+
+Sends scan results to external services (Slack, Discord, or generic JSON endpoints)
+when a penetration test completes.
+"""
+
+from __future__ import annotations
+
+import logging
+from typing import TYPE_CHECKING, Any
+from urllib.parse import urlparse
+
+import requests
+
+
+if TYPE_CHECKING:
+    import argparse
+
+
+logger = logging.getLogger(__name__)
+
+WEBHOOK_TIMEOUT = 10
+
+
+def send_completion_webhook(
+    webhook_url: str,
+    webhook_format: str,
+    tracer: Any,
+    args: argparse.Namespace,
+) -> None:
+    """Send scan completion results to a webhook URL.
+
+    Args:
+        webhook_url: The destination webhook URL.
+        webhook_format: One of ``"generic"``, ``"slack"``, or ``"discord"``.
+        tracer: The global :class:`Tracer` instance containing scan results.
+        args: Parsed CLI arguments (used to extract target info and run name).
+    """
+    resolved_format = _resolve_format(webhook_url, webhook_format)
+
+    formatters: dict[str, Any] = {
+        "generic": _format_generic,
+        "slack": _format_slack,
+        "discord": _format_discord,
+    }
+
+    formatter = formatters.get(resolved_format, _format_generic)
+    payload = formatter(tracer, args)
+
+    try:
+        response = requests.post(webhook_url, json=payload, timeout=WEBHOOK_TIMEOUT)
+        response.raise_for_status()
+        logger.info(
+            "Webhook delivered successfully to %s (status %s)",
+            webhook_url,
+            response.status_code,
+        )
+    except requests.RequestException as exc:
+        logger.warning("Failed to deliver webhook to %s: %s", webhook_url, exc)
+
+
+# ---------------------------------------------------------------------------
+# Format resolution
+# ---------------------------------------------------------------------------
+
+
+def _resolve_format(url: str, explicit_format: str) -> str:
+    """Auto-detect the webhook format from the URL when the user chose ``"generic"``."""
+    if explicit_format != "generic":
+        return explicit_format
+
+    host = urlparse(url).hostname or ""
+    if "hooks.slack.com" in host:
+        return "slack"
+    if "discord.com" in host or "discordapp.com" in host:
+        return "discord"
+
+    return "generic"
+
+
+# ---------------------------------------------------------------------------
+# Payload helpers
+# ---------------------------------------------------------------------------
+
+
+def _targets_summary(args: argparse.Namespace) -> str:
+    targets_info: list[dict[str, Any]] = getattr(args, "targets_info", [])
+    if not targets_info:
+        return "unknown"
+    return ", ".join(t.get("original", "unknown") for t in targets_info)
+
+
+def _vulnerability_summary(tracer: Any) -> list[dict[str, Any]]:
+    """Return a lightweight list of vulnerability dicts safe for JSON serialisation."""
+    return [
+        {
+            "id": report.get("id", ""),
+            "title": report.get("title", ""),
+            "severity": report.get("severity", ""),
+            "cvss": report.get("cvss"),
+            "target": report.get("target", ""),
+            "endpoint": report.get("endpoint", ""),
+            "description": report.get("description", ""),
+        }
+        for report in tracer.vulnerability_reports
+    ]
+
+
+def _severity_counts(tracer: Any) -> dict[str, int]:
+    counts: dict[str, int] = {"critical": 0, "high": 0, "medium": 0, "low": 0, "info": 0}
+    for report in tracer.vulnerability_reports:
+        severity = report.get("severity", "").lower()
+        if severity in counts:
+            counts[severity] += 1
+    return counts
+
+
+def _scan_completed(tracer: Any) -> bool:
+    if tracer and tracer.scan_results:
+        return bool(tracer.scan_results.get("scan_completed", False))
+    return False
+
+
+# ---------------------------------------------------------------------------
+# Formatters
+# ---------------------------------------------------------------------------
+
+
+def _format_generic(tracer: Any, args: argparse.Namespace) -> dict[str, Any]:
+    """Plain JSON payload with full scan data."""
+    completed = _scan_completed(tracer)
+    llm_stats = tracer.get_total_llm_stats()["total"] if tracer else {}
+    return {
+        "event": "scan_completed" if completed else "scan_ended",
+        "run_name": getattr(args, "run_name", ""),
+        "targets": _targets_summary(args),
+        "scan_mode": getattr(args, "scan_mode", ""),
+        "completed": completed,
+        "vulnerability_count": len(tracer.vulnerability_reports),
+        "severity_counts": _severity_counts(tracer),
+        "vulnerabilities": _vulnerability_summary(tracer),
+        "stats": {
+            "agents": len(tracer.agents),
+            "tools": tracer.get_real_tool_count(),
+            "input_tokens": llm_stats.get("input_tokens", 0),
+            "output_tokens": llm_stats.get("output_tokens", 0),
+            "cost": llm_stats.get("cost", 0),
+        },
+    }
+
+
+def _format_slack(tracer: Any, args: argparse.Namespace) -> dict[str, Any]:
+    """Slack Block Kit payload."""
+    completed = _scan_completed(tracer)
+    vuln_count = len(tracer.vulnerability_reports)
+    counts = _severity_counts(tracer)
+
+    status_emoji = ":white_check_mark:" if completed else ":warning:"
+    status_text = "completed" if completed else "ended"
+
+    severity_line = (
+        " | ".join(f"*{sev.upper()}*: {cnt}" for sev, cnt in counts.items() if cnt > 0)
+        or "None found"
+    )
+
+    blocks: list[dict[str, Any]] = [
+        {
+            "type": "header",
+            "text": {
+                "type": "plain_text",
+                "text": f"{status_emoji} Strix Scan {status_text.title()}",
+                "emoji": True,
+            },
+        },
+        {
+            "type": "section",
+            "fields": [
+                {"type": "mrkdwn", "text": f"*Target:*\n{_targets_summary(args)}"},
+                {"type": "mrkdwn", "text": f"*Run:*\n{getattr(args, 'run_name', 'N/A')}"},
+                {"type": "mrkdwn", "text": f"*Scan Mode:*\n{getattr(args, 'scan_mode', 'N/A')}"},
+                {"type": "mrkdwn", "text": f"*Vulnerabilities:*\n{vuln_count}"},
+            ],
+        },
+        {
+            "type": "section",
+            "text": {
+                "type": "mrkdwn",
+                "text": f"*Severity Breakdown:* {severity_line}",
+            },
+        },
+    ]
+
+    # Add top vulnerabilities (max 5)
+    for report in tracer.vulnerability_reports[:5]:
+        title = report.get("title", "Untitled")
+        severity = report.get("severity", "unknown").upper()
+        endpoint = report.get("endpoint", "")
+        text = f":rotating_light: *[{severity}]* {title}"
+        if endpoint:
+            text += f"\n`{endpoint}`"
+        blocks.append(
+            {
+                "type": "section",
+                "text": {"type": "mrkdwn", "text": text},
+            }
+        )
+
+    return {"blocks": blocks}
+
+
+def _format_discord(tracer: Any, args: argparse.Namespace) -> dict[str, Any]:
+    """Discord webhook payload with an embed."""
+    completed = _scan_completed(tracer)
+    vuln_count = len(tracer.vulnerability_reports)
+    counts = _severity_counts(tracer)
+
+    color = 0x22C55E if completed else 0xEAB308  # green / yellow
+    if counts["critical"] > 0:
+        color = 0xDC2626
+    elif counts["high"] > 0:
+        color = 0xEA580C
+
+    severity_line = (
+        " | ".join(f"**{sev.upper()}**: {cnt}" for sev, cnt in counts.items() if cnt > 0)
+        or "None found"
+    )
+
+    fields: list[dict[str, Any]] = [
+        {"name": "Target", "value": _targets_summary(args), "inline": True},
+        {"name": "Scan Mode", "value": getattr(args, "scan_mode", "N/A"), "inline": True},
+        {"name": "Vulnerabilities", "value": str(vuln_count), "inline": True},
+        {"name": "Severity Breakdown", "value": severity_line, "inline": False},
+    ]
+
+    # Top vulnerabilities (max 5)
+    for report in tracer.vulnerability_reports[:5]:
+        title = report.get("title", "Untitled")
+        severity = report.get("severity", "unknown").upper()
+        endpoint = report.get("endpoint", "")
+        value = f"**[{severity}]** {title}"
+        if endpoint:
+            value += f"\n`{endpoint}`"
+        fields.append({"name": "\u200b", "value": value, "inline": False})
+
+    status_text = "Scan Completed" if completed else "Scan Ended"
+
+    embed: dict[str, Any] = {
+        "title": f"\ud83d\udd12 Strix \u2014 {status_text}",
+        "description": f"Run: **{getattr(args, 'run_name', 'N/A')}**",
+        "color": color,
+        "fields": fields,
+        "footer": {"text": "Strix Security Scanner"},
+    }
+
+    return {"embeds": [embed]}
diff --git a/tests/interface/test_webhooks.py b/tests/interface/test_webhooks.py
new file mode 100644
index 00000000..364307d5
--- /dev/null
+++ b/tests/interface/test_webhooks.py
@@ -0,0 +1,272 @@
+"""Tests for the webhook dispatcher module."""
+
+from __future__ import annotations
+
+import argparse
+from typing import Any
+from unittest.mock import MagicMock, patch
+
+import requests
+
+from strix.interface.webhooks import (
+    _format_discord,
+    _format_generic,
+    _format_slack,
+    _resolve_format,
+    _severity_counts,
+    _targets_summary,
+    _vulnerability_summary,
+    send_completion_webhook,
+)
+
+
+def _make_tracer(
+    vulnerability_reports: list[dict[str, Any]] | None = None,
+    scan_completed: bool = True,
+) -> MagicMock:
+    """Create a mock tracer with configurable vulnerability reports."""
+    tracer = MagicMock()
+    tracer.vulnerability_reports = vulnerability_reports or []
+    tracer.scan_results = {"scan_completed": scan_completed}
+    tracer.agents = {"agent-1": {}, "agent-2": {}}
+    tracer.get_real_tool_count.return_value = 5
+    tracer.get_total_llm_stats.return_value = {
+        "total": {
+            "input_tokens": 1000,
+            "output_tokens": 500,
+            "cost": 0.05,
+            "requests": 3,
+            "cached_tokens": 200,
+        }
+    }
+    return tracer
+
+
+def _make_args(
+    targets_info: list[dict[str, Any]] | None = None,
+    run_name: str = "test-run_abcd",
+    scan_mode: str = "deep",
+) -> argparse.Namespace:
+    """Create a mock args namespace."""
+    default_targets: list[dict[str, Any]] = [
+        {"original": "https://example.com", "type": "web_application"},
+    ]
+    return argparse.Namespace(
+        targets_info=targets_info if targets_info is not None else default_targets,
+        run_name=run_name,
+        scan_mode=scan_mode,
+    )
+
+
+SAMPLE_VULNS: list[dict[str, Any]] = [
+    {
+        "id": "VULN-001",
+        "title": "SQL Injection in login endpoint",
+        "severity": "critical",
+        "cvss": 9.8,
+        "target": "https://example.com",
+        "endpoint": "/api/login",
+        "description": "Unsanitised input allows SQL injection.",
+    },
+    {
+        "id": "VULN-002",
+        "title": "Reflected XSS",
+        "severity": "high",
+        "cvss": 7.1,
+        "target": "https://example.com",
+        "endpoint": "/search?q=<script>",
+        "description": "User input reflected without encoding.",
+    },
+]
+
+
+class TestResolveFormat:
+    """Tests for webhook format auto-detection."""
+
+    def test_explicit_slack_format(self) -> None:
+        """Explicit format should override auto-detection."""
+        assert _resolve_format("https://example.com/hook", "slack") == "slack"
+
+    def test_explicit_discord_format(self) -> None:
+        """Explicit format should override auto-detection."""
+        assert _resolve_format("https://example.com/hook", "discord") == "discord"
+
+    def test_auto_detect_slack(self) -> None:
+        """Slack URLs should be auto-detected."""
+        url = "https://hooks.slack.com/services/T00/B00/xxx"
+        assert _resolve_format(url, "generic") == "slack"
+
+    def test_auto_detect_discord(self) -> None:
+        """Discord URLs should be auto-detected."""
+        url = "https://discord.com/api/webhooks/123456/token"
+        assert _resolve_format(url, "generic") == "discord"
+
+    def test_auto_detect_discordapp(self) -> None:
+        """Legacy discordapp.com URLs should be auto-detected."""
+        url = "https://discordapp.com/api/webhooks/123456/token"
+        assert _resolve_format(url, "generic") == "discord"
+
+    def test_generic_fallback(self) -> None:
+        """Unknown URLs should stay generic."""
+        assert _resolve_format("https://example.com/hook", "generic") == "generic"
+
+
+class TestTargetsSummary:
+    """Tests for _targets_summary."""
+
+    def test_single_target(self) -> None:
+        args = _make_args()
+        assert _targets_summary(args) == "https://example.com"
+
+    def test_multiple_targets(self) -> None:
+        args = _make_args(
+            targets_info=[
+                {"original": "https://a.com"},
+                {"original": "https://b.com"},
+            ]
+        )
+        assert _targets_summary(args) == "https://a.com, https://b.com"
+
+    def test_no_targets(self) -> None:
+        args = _make_args(targets_info=[])
+        assert _targets_summary(args) == "unknown"
+
+
+class TestSeverityCounts:
+    """Tests for _severity_counts."""
+
+    def test_counts_severities(self) -> None:
+        tracer = _make_tracer(vulnerability_reports=SAMPLE_VULNS)
+        counts = _severity_counts(tracer)
+        assert counts["critical"] == 1
+        assert counts["high"] == 1
+        assert counts["medium"] == 0
+
+    def test_empty_reports(self) -> None:
+        tracer = _make_tracer()
+        counts = _severity_counts(tracer)
+        assert all(v == 0 for v in counts.values())
+
+
+class TestVulnerabilitySummary:
+    """Tests for _vulnerability_summary."""
+
+    def test_returns_expected_keys(self) -> None:
+        tracer = _make_tracer(vulnerability_reports=SAMPLE_VULNS)
+        result = _vulnerability_summary(tracer)
+        assert len(result) == 2
+        assert result[0]["id"] == "VULN-001"
+        assert result[0]["severity"] == "critical"
+
+    def test_empty_reports(self) -> None:
+        tracer = _make_tracer()
+        assert _vulnerability_summary(tracer) == []
+
+
+class TestFormatGeneric:
+    """Tests for the generic JSON formatter."""
+
+    def test_structure(self) -> None:
+        tracer = _make_tracer(vulnerability_reports=SAMPLE_VULNS)
+        args = _make_args()
+        payload = _format_generic(tracer, args)
+
+        assert payload["event"] == "scan_completed"
+        assert payload["run_name"] == "test-run_abcd"
+        assert payload["vulnerability_count"] == 2
+        assert payload["completed"] is True
+        assert "vulnerabilities" in payload
+        assert "stats" in payload
+
+    def test_scan_not_completed(self) -> None:
+        tracer = _make_tracer(scan_completed=False)
+        args = _make_args()
+        payload = _format_generic(tracer, args)
+
+        assert payload["event"] == "scan_ended"
+        assert payload["completed"] is False
+
+
+class TestFormatSlack:
+    """Tests for the Slack Block Kit formatter."""
+
+    def test_structure(self) -> None:
+        tracer = _make_tracer(vulnerability_reports=SAMPLE_VULNS)
+        args = _make_args()
+        payload = _format_slack(tracer, args)
+
+        assert "blocks" in payload
+        blocks = payload["blocks"]
+        assert blocks[0]["type"] == "header"
+        assert blocks[1]["type"] == "section"
+
+    def test_no_vulnerabilities(self) -> None:
+        tracer = _make_tracer()
+        args = _make_args()
+        payload = _format_slack(tracer, args)
+
+        # Should still have header + summary blocks, just no vuln blocks
+        assert len(payload["blocks"]) == 3
+
+
+class TestFormatDiscord:
+    """Tests for the Discord embed formatter."""
+
+    def test_structure(self) -> None:
+        tracer = _make_tracer(vulnerability_reports=SAMPLE_VULNS)
+        args = _make_args()
+        payload = _format_discord(tracer, args)
+
+        assert "embeds" in payload
+        embed = payload["embeds"][0]
+        assert "Scan Completed" in embed["title"]
+        assert embed["color"] == 0xDC2626  # critical = red
+
+    def test_clean_scan_is_green(self) -> None:
+        tracer = _make_tracer()
+        args = _make_args()
+        payload = _format_discord(tracer, args)
+
+        embed = payload["embeds"][0]
+        assert embed["color"] == 0x22C55E  # green
+
+
+class TestSendCompletionWebhook:
+    """Tests for the top-level send function."""
+
+    @patch("strix.interface.webhooks.requests.post")
+    def test_posts_to_url(self, mock_post: MagicMock) -> None:
+        """Verify that the function POSTs to the provided URL."""
+        mock_post.return_value = MagicMock(status_code=200)
+        tracer = _make_tracer()
+        args = _make_args()
+
+        send_completion_webhook("https://example.com/hook", "generic", tracer, args)
+
+        mock_post.assert_called_once()
+        call_kwargs = mock_post.call_args
+        assert call_kwargs[1]["json"]["event"] == "scan_completed"
+
+    @patch("strix.interface.webhooks.requests.post")
+    def test_auto_detects_slack(self, mock_post: MagicMock) -> None:
+        """Verify Slack auto-detection produces Block Kit payload."""
+        mock_post.return_value = MagicMock(status_code=200)
+        tracer = _make_tracer()
+        args = _make_args()
+
+        send_completion_webhook(
+            "https://hooks.slack.com/services/T00/B00/xxx", "generic", tracer, args
+        )
+
+        payload = mock_post.call_args[1]["json"]
+        assert "blocks" in payload
+
+    @patch("strix.interface.webhooks.requests.post")
+    def test_failure_does_not_raise(self, mock_post: MagicMock) -> None:
+        """Webhook delivery failures should be logged, not raised."""
+        mock_post.side_effect = requests.ConnectionError("refused")
+        tracer = _make_tracer()
+        args = _make_args()
+
+        # Should not raise
+        send_completion_webhook("https://example.com/hook", "generic", tracer, args)