Cisco announced DefenseClaw in early 2026 as a suite of four tools under the AI Defense umbrella. The umbrella repository has 167 GitHub stars (as of March 28, 2026). Related tools under the same org — mcp-scanner (860+ stars) and skill-scanner (1,500+ stars) — are separate repos. ClawGuard has been shipping since late 2025 with a different philosophy.
Update (March 28, 2026): DefenseClaw released source code on March 28, 2026 (Python + Go, CLI, plugins, policies). The repository now contains a functional codebase. Our comparison below reflects both the documented architecture and the initial release. Stars: 167.
This is not a "we're better" post. These are two architecturally different tools solving overlapping problems. Here's what actually differs so you can decide which fits your stack.
| ClawGuard | DefenseClaw | |
|---|---|---|
| Detection Engine | Compiled regex (re.compile cache) | YARA rules + LLM-as-judge |
| Patterns | 225 patterns | YARA ruleset (count undisclosed) |
| Latency | <10ms per scan | Seconds (LLM inference required) |
| Languages | 15 (DE, FR, ES, ZH, JA, KO, ...) | English (no multilingual docs) |
| Dependencies | Zero (stdlib only) | Cisco AI Defense API, LLM provider, VirusTotal API |
| EU AI Act Mapping | Art. 9, 13, 15 mapped per finding | None documented |
| Toolset Scope | Prompt injection + MCP security scanner | 4 tools (MCP Scanner, Skill Scanner, AI BoM, CodeGuard) |
| Offline / Air-gapped | Fully offline capable | Requires internet (cloud APIs) |
| License | MIT | Apache 2.0 |
| Target Audience | SMBs, startups, compliance teams | Enterprise, Cisco ecosystem |
| OWASP Coverage | LLM + Agentic + MCP Top 10 | Partial (MCP-focused) |
| GitHub Action | Yes (clawguard-action@v1) | No |
* DefenseClaw details based on documented architecture only. No source code has been released as of March 27, 2026.
This is the fundamental difference. ClawGuard compiles 225 regex patterns at import time and matches against them in-process. No network calls, no GPU, no API keys. A scan takes under 10 milliseconds.
DefenseClaw takes a different approach: YARA rules handle static pattern matching, but the heavy lifting is done by an LLM that judges whether a given input is malicious. This means higher flexibility for novel attacks — an LLM can catch patterns that no regex anticipated — but it also means every scan requires an inference call.
The tradeoffs are predictable:
| Factor | Regex (ClawGuard) | LLM-as-Judge (DefenseClaw) |
|---|---|---|
| Latency | Microseconds to milliseconds | Hundreds of ms to seconds |
| Cost per scan | Zero (CPU only) | LLM API costs per request |
| Determinism | 100% reproducible | Non-deterministic (LLM variance) |
| Novel attack detection | Limited to known patterns | Can generalize to unseen attacks |
| Offline deployment | Works anywhere | Requires API connectivity |
For runtime guardrails where every millisecond counts — think middleware scanning every user message before it hits your agent — regex is the practical choice. For deep analysis of MCP server configurations where you can afford seconds per scan, LLM-as-judge adds a layer of semantic understanding.
DefenseClaw ships four distinct tools. Beyond MCP scanning, you get:
If you're already in the Cisco ecosystem or need a broader AI security suite, DefenseClaw covers more surface area in a single package. The LLM-as-judge approach also means it can theoretically catch zero-day injection patterns that no rule-based scanner has seen before.
At <10ms per scan, ClawGuard can sit in your request pipeline without adding noticeable latency. This matters for real-time chat applications and high-throughput API gateways.
Prompt injection is not an English-only problem. Attackers use German, Chinese, Japanese, Korean, and 11 other languages to bypass English-only scanners. ClawGuard ships patterns for all 15.
Every finding maps to specific EU AI Act articles (9, 13, 15). With the August 2, 2026 deadline approaching, teams operating in the EU need audit trails that connect security findings to regulatory requirements. ClawGuard generates these mappings automatically.
No API keys to manage. No cloud connectivity required. No LLM provider bills. Install it, import it, scan. This makes it viable for air-gapped environments, on-premise deployments, and CI/CD pipelines where external API calls are restricted.
Choose ClawGuard if: you need runtime scanning (<10ms), multilingual coverage, EU AI Act compliance, offline/air-gapped deployment, or zero operational cost per scan.
Choose DefenseClaw if: you need broader AI security tooling (BoM, CodeGuard, Skill Scanner), want LLM-based semantic analysis for novel attacks, or are already embedded in the Cisco security ecosystem.
Use both if: you want deterministic regex scanning as a fast first layer and LLM-as-judge as a deeper second pass. The tools are not mutually exclusive — they complement each other well in a layered security architecture.
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225 patterns, 15 languages, <10ms latency. Free scan, no account needed.