feat: add InsAIts PostToolUse security monitoring hook

hooks/README.md

@@ -25,6 +25,7 @@ User request → Claude picks a tool → PreToolUse hook runs → Tool executes
 | **Git push reminder** | `Bash` | Reminds to review changes before `git push` | 0 (warns) |
 | **Doc file warning** | `Write` | Warns about non-standard `.md`/`.txt` files (allows README, CLAUDE, CONTRIBUTING, CHANGELOG, LICENSE, SKILL, docs/, skills/); cross-platform path handling | 0 (warns) |
 | **Strategic compact** | `Edit\|Write` | Suggests manual `/compact` at logical intervals (every ~50 tool calls) | 0 (warns) |
+| **InsAIts security monitor (opt-in)** | `Bash\|Write\|Edit\|MultiEdit` | Optional security scan for high-signal tool inputs. Disabled unless `ECC_ENABLE_INSAITS=1`. Blocks on critical findings, warns on non-critical, and writes audit log to `.insaits_audit_session.jsonl`. Requires `pip install insa-its`. [Details](../scripts/hooks/insaits-security-monitor.py) | 2 (blocks critical) / 0 (warns) |
 
 ### PostToolUse Hooks
 

hooks/hooks.json

@@ -63,6 +63,17 @@
           }
         ],
         "description": "Capture tool use observations for continuous learning"
+      },
+      {
+        "matcher": "Bash|Write|Edit|MultiEdit",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "node \"${CLAUDE_PLUGIN_ROOT}/scripts/hooks/run-with-flags.js\" \"pre:insaits-security\" \"scripts/hooks/insaits-security-wrapper.js\" \"standard,strict\"",
+            "timeout": 15
+          }
+        ],
+        "description": "Optional InsAIts AI security monitor for Bash/Edit/Write flows. Enable with ECC_ENABLE_INSAITS=1. Requires: pip install insa-its"
       }
     ],
     "PreCompact": [

mcp-configs/mcp-servers.json

@@ -88,6 +88,11 @@
       "command": "npx",
       "args": ["-y", "@modelcontextprotocol/server-filesystem", "/path/to/your/projects"],
       "description": "Filesystem operations (set your path)"
+    },
+    "insaits": {
+      "command": "python3",
+      "args": ["-m", "insa_its.mcp_server"],
+      "description": "AI-to-AI security monitoring — anomaly detection, credential exposure, hallucination checks, forensic tracing. 23 anomaly types, OWASP MCP Top 10 coverage. 100% local. Install: pip install insa-its"
     }
   },
   "_comments": {

scripts/hooks/insaits-security-monitor.py

@@ -0,0 +1,269 @@
+#!/usr/bin/env python3
+"""
+InsAIts Security Monitor -- PreToolUse Hook for Claude Code
+============================================================
+
+Real-time security monitoring for Claude Code tool inputs.
+Detects credential exposure, prompt injection, behavioral anomalies,
+hallucination chains, and 20+ other anomaly types -- runs 100% locally.
+
+Writes audit events to .insaits_audit_session.jsonl for forensic tracing.
+
+Setup:
+  pip install insa-its
+  export ECC_ENABLE_INSAITS=1
+
+  Add to .claude/settings.json:
+  {
+    "hooks": {
+      "PreToolUse": [
+        {
+          "matcher": "Bash|Write|Edit|MultiEdit",
+          "hooks": [
+            {
+              "type": "command",
+              "command": "node scripts/hooks/insaits-security-wrapper.js"
+            }
+          ]
+        }
+      ]
+    }
+  }
+
+How it works:
+  Claude Code passes tool input as JSON on stdin.
+  This script runs InsAIts anomaly detection on the content.
+  Exit code 0 = clean (pass through).
+  Exit code 2 = critical issue found (blocks tool execution).
+  Stderr output = non-blocking warning shown to Claude.
+
+Environment variables:
+  INSAITS_DEV_MODE   Set to "true" to enable dev mode (no API key needed).
+                     Defaults to "false" (strict mode).
+  INSAITS_MODEL      LLM model identifier for fingerprinting. Default: claude-opus.
+  INSAITS_FAIL_MODE  "open" (default) = continue on SDK errors.
+                     "closed" = block tool execution on SDK errors.
+  INSAITS_VERBOSE    Set to any value to enable debug logging.
+
+Detections include:
+  - Credential exposure (API keys, tokens, passwords)
+  - Prompt injection patterns
+  - Hallucination indicators (phantom citations, fact contradictions)
+  - Behavioral anomalies (context loss, semantic drift)
+  - Tool description divergence
+  - Shorthand emergence / jargon drift
+
+All processing is local -- no data leaves your machine.
+
+Author: Cristi Bogdan -- YuyAI (https://github.com/Nomadu27/InsAIts)
+License: Apache 2.0
+"""
+
+from __future__ import annotations
+
+import hashlib
+import json
+import logging
+import os
+import sys
+import time
+from typing import Any, Dict, List, Tuple
+
+# Configure logging to stderr so it does not interfere with stdout protocol
+logging.basicConfig(
+    stream=sys.stderr,
+    format="[InsAIts] %(message)s",
+    level=logging.DEBUG if os.environ.get("INSAITS_VERBOSE") else logging.WARNING,
+)
+log = logging.getLogger("insaits-hook")
+
+# Try importing InsAIts SDK
+try:
+    from insa_its import insAItsMonitor
+    INSAITS_AVAILABLE: bool = True
+except ImportError:
+    INSAITS_AVAILABLE = False
+
+# --- Constants ---
+AUDIT_FILE: str = ".insaits_audit_session.jsonl"
+MIN_CONTENT_LENGTH: int = 10
+MAX_SCAN_LENGTH: int = 4000
+DEFAULT_MODEL: str = "claude-opus"
+BLOCKING_SEVERITIES: frozenset = frozenset({"CRITICAL"})
+
+
+def extract_content(data: Dict[str, Any]) -> Tuple[str, str]:
+    """Extract inspectable text from a Claude Code tool input payload.
+
+    Returns:
+        A (text, context) tuple where *text* is the content to scan and
+        *context* is a short label for the audit log.
+    """
+    tool_name: str = data.get("tool_name", "")
+    tool_input: Dict[str, Any] = data.get("tool_input", {})
+
+    text: str = ""
+    context: str = ""
+
+    if tool_name in ("Write", "Edit", "MultiEdit"):
+        text = tool_input.get("content", "") or tool_input.get("new_string", "")
+        context = "file:" + str(tool_input.get("file_path", ""))[:80]
+    elif tool_name == "Bash":
+        # PreToolUse: the tool hasn't executed yet, inspect the command
+        command: str = str(tool_input.get("command", ""))
+        text = command
+        context = "bash:" + command[:80]
+    elif "content" in data:
+        content: Any = data["content"]
+        if isinstance(content, list):
+            text = "\n".join(
+                b.get("text", "") for b in content if b.get("type") == "text"
+            )
+        elif isinstance(content, str):
+            text = content
+        context = str(data.get("task", ""))
+
+    return text, context
+
+
+def write_audit(event: Dict[str, Any]) -> None:
+    """Append an audit event to the JSONL audit log.
+
+    Creates a new dict to avoid mutating the caller's *event*.
+    """
+    try:
+        enriched: Dict[str, Any] = {
+            **event,
+            "timestamp": time.strftime("%Y-%m-%dT%H:%M:%SZ", time.gmtime()),
+        }
+        enriched["hash"] = hashlib.sha256(
+            json.dumps(enriched, sort_keys=True).encode()
+        ).hexdigest()[:16]
+        with open(AUDIT_FILE, "a", encoding="utf-8") as f:
+            f.write(json.dumps(enriched) + "\n")
+    except OSError as exc:
+        log.warning("Failed to write audit log %s: %s", AUDIT_FILE, exc)
+
+
+def get_anomaly_attr(anomaly: Any, key: str, default: str = "") -> str:
+    """Get a field from an anomaly that may be a dict or an object.
+
+    The SDK's ``send_message()`` returns anomalies as dicts, while
+    other code paths may return dataclass/object instances.  This
+    helper handles both transparently.
+    """
+    if isinstance(anomaly, dict):
+        return str(anomaly.get(key, default))
+    return str(getattr(anomaly, key, default))
+
+
+def format_feedback(anomalies: List[Any]) -> str:
+    """Format detected anomalies as feedback for Claude Code.
+
+    Returns:
+        A human-readable multi-line string describing each finding.
+    """
+    lines: List[str] = [
+        "== InsAIts Security Monitor -- Issues Detected ==",
+        "",
+    ]
+    for i, a in enumerate(anomalies, 1):
+        sev: str = get_anomaly_attr(a, "severity", "MEDIUM")
+        atype: str = get_anomaly_attr(a, "type", "UNKNOWN")
+        detail: str = get_anomaly_attr(a, "details", "")
+        lines.extend([
+            f"{i}. [{sev}] {atype}",
+            f"   {detail[:120]}",
+            "",
+        ])
+    lines.extend([
+        "-" * 56,
+        "Fix the issues above before continuing.",
+        "Audit log: " + AUDIT_FILE,
+    ])
+    return "\n".join(lines)
+
+
+def main() -> None:
+    """Entry point for the Claude Code PreToolUse hook."""
+    raw: str = sys.stdin.read().strip()
+    if not raw:
+        sys.exit(0)
+
+    try:
+        data: Dict[str, Any] = json.loads(raw)
+    except json.JSONDecodeError:
+        data = {"content": raw}
+
+    text, context = extract_content(data)
+
+    # Skip very short content (e.g. "OK", empty bash results)
+    if len(text.strip()) < MIN_CONTENT_LENGTH:
+        sys.exit(0)
+
+    if not INSAITS_AVAILABLE:
+        log.warning("Not installed. Run: pip install insa-its")
+        sys.exit(0)
+
+    # Wrap SDK calls so an internal error does not crash the hook
+    try:
+        monitor: insAItsMonitor = insAItsMonitor(
+            session_name="claude-code-hook",
+            dev_mode=os.environ.get(
+                "INSAITS_DEV_MODE", "false"
+            ).lower() in ("1", "true", "yes"),
+        )
+        result: Dict[str, Any] = monitor.send_message(
+            text=text[:MAX_SCAN_LENGTH],
+            sender_id="claude-code",
+            llm_id=os.environ.get("INSAITS_MODEL", DEFAULT_MODEL),
+        )
+    except Exception as exc:  # Broad catch intentional: unknown SDK internals
+        fail_mode: str = os.environ.get("INSAITS_FAIL_MODE", "open").lower()
+        if fail_mode == "closed":
+            sys.stdout.write(
+                f"InsAIts SDK error ({type(exc).__name__}); "
+                "blocking execution to avoid unscanned input.\n"
+            )
+            sys.exit(2)
+        log.warning(
+            "SDK error (%s), skipping security scan: %s",
+            type(exc).__name__, exc,
+        )
+        sys.exit(0)
+
+    anomalies: List[Any] = result.get("anomalies", [])
+
+    # Write audit event regardless of findings
+    write_audit({
+        "tool": data.get("tool_name", "unknown"),
+        "context": context,
+        "anomaly_count": len(anomalies),
+        "anomaly_types": [get_anomaly_attr(a, "type") for a in anomalies],
+        "text_length": len(text),
+    })
+
+    if not anomalies:
+        log.debug("Clean -- no anomalies detected.")
+        sys.exit(0)
+
+    # Determine maximum severity
+    has_critical: bool = any(
+        get_anomaly_attr(a, "severity").upper() in BLOCKING_SEVERITIES
+        for a in anomalies
+    )
+
+    feedback: str = format_feedback(anomalies)
+
+    if has_critical:
+        # stdout feedback -> Claude Code shows to the model
+        sys.stdout.write(feedback + "\n")
+        sys.exit(2)  # PreToolUse exit 2 = block tool execution
+    else:
+        # Non-critical: warn via stderr (non-blocking)
+        log.warning("\n%s", feedback)
+        sys.exit(0)
+
+
+if __name__ == "__main__":
+    main()

scripts/hooks/insaits-security-wrapper.js

@@ -0,0 +1,88 @@
+#!/usr/bin/env node
+/**
+ * InsAIts Security Monitor — wrapper for run-with-flags compatibility.
+ *
+ * This thin wrapper receives stdin from the hooks infrastructure and
+ * delegates to the Python-based insaits-security-monitor.py script.
+ *
+ * The wrapper exists because run-with-flags.js spawns child scripts
+ * via `node`, so a JS entry point is needed to bridge to Python.
+ */
+
+'use strict';
+
+const path = require('path');
+const { spawnSync } = require('child_process');
+
+const MAX_STDIN = 1024 * 1024;
+
+function isEnabled(value) {
+  return ['1', 'true', 'yes', 'on'].includes(String(value || '').toLowerCase());
+}
+
+let raw = '';
+process.stdin.setEncoding('utf8');
+process.stdin.on('data', chunk => {
+  if (raw.length < MAX_STDIN) {
+    raw += chunk.substring(0, MAX_STDIN - raw.length);
+  }
+});
+
+process.stdin.on('end', () => {
+  if (!isEnabled(process.env.ECC_ENABLE_INSAITS)) {
+    process.stdout.write(raw);
+    process.exit(0);
+  }
+
+  const scriptDir = __dirname;
+  const pyScript = path.join(scriptDir, 'insaits-security-monitor.py');
+
+  // Try python3 first (macOS/Linux), fall back to python (Windows)
+  const pythonCandidates = ['python3', 'python'];
+  let result;
+
+  for (const pythonBin of pythonCandidates) {
+    result = spawnSync(pythonBin, [pyScript], {
+      input: raw,
+      encoding: 'utf8',
+      env: process.env,
+      cwd: process.cwd(),
+      timeout: 14000,
+    });
+
+    // ENOENT means binary not found — try next candidate
+    if (result.error && result.error.code === 'ENOENT') {
+      continue;
+    }
+    break;
+  }
+
+  if (!result || (result.error && result.error.code === 'ENOENT')) {
+    process.stderr.write('[InsAIts] python3/python not found. Install Python 3.9+ and: pip install insa-its\n');
+    process.stdout.write(raw);
+    process.exit(0);
+  }
+
+  // Log non-ENOENT spawn errors (timeout, signal kill, etc.) so users
+  // know the security monitor did not run — fail-open with a warning.
+  if (result.error) {
+    process.stderr.write(`[InsAIts] Security monitor failed to run: ${result.error.message}\n`);
+    process.stdout.write(raw);
+    process.exit(0);
+  }
+
+  // result.status is null when the process was killed by a signal or
+  // timed out.  Check BEFORE writing stdout to avoid leaking partial
+  // or corrupt monitor output.  Pass through original raw input instead.
+  if (!Number.isInteger(result.status)) {
+    const signal = result.signal || 'unknown';
+    process.stderr.write(`[InsAIts] Security monitor killed (signal: ${signal}). Tool execution continues.\n`);
+    process.stdout.write(raw);
+    process.exit(0);
+  }
+
+  if (result.stdout) process.stdout.write(result.stdout);
+  if (result.stderr) process.stderr.write(result.stderr);
+
+  process.exit(result.status);
+});