Practical coverage of defensive AI engineering. Guardrails for LLMs, content filters and moderation pipelines, model defenses against adversarial attacks, output safety, and how to ship AI features without shipping liability with them.https://guardml.io/enhttps://guardml.io/posts/constitutional-ai/https://guardml.io/posts/constitutional-ai/Constitutional AI replaces human harm labels with a written set of principles and AI self-critique. Here is how the method works, where it sits in yourThu, 18 Jun 2026 00:00:00 GMTconstitutional-airlaifmodel-alignmentllm-safetyguardrailsrlhfGuardML Editorialhttps://guardml.io/posts/llm-guardrails-3/https://guardml.io/posts/llm-guardrails-3/A practitioner's guide to LLM guardrails — the five rail types, what each one actually catches, where each is bypassed, and how to wire a stack that failsWed, 03 Jun 2026 00:00:00 GMTllm-guardrailsguardrailscontent-filterprompt-injectiondefense-in-depthtoolingGuardML Editorialhttps://guardml.io/posts/mcp-tool-poisoning-defensive-guardrails/https://guardml.io/posts/mcp-tool-poisoning-defensive-guardrails/MCP makes every server an injection surface in your LLM app. Tool poisoning, rug-pulls, and the lethal trifecta are live. Here is what to actually defend.Sat, 30 May 2026 00:00:00 GMTmcpprompt-injectiontool-poisoningagent-securityguardrailslethal-trifectaGuardML Editorialhttps://guardml.io/posts/g4-meromero-31b-uncensored-heretic-is-out-now-a-finetune-of/https://guardml.io/posts/g4-meromero-31b-uncensored-heretic-is-out-now-a-finetune-of/A new uncensored fine-tune of Gemma 4 31B achieves a 15/100 refusal rate via Arbitrary-Rank Ablation on attention output projections — KL divergence 0.Sat, 16 May 2026 00:00:00 GMTbypassabliterationalignmentfine-tuningcontent-filterguardrailsGuardML Editorialhttps://guardml.io/posts/ai-moderation-tools/https://guardml.io/posts/ai-moderation-tools/A practitioner's comparison of AI moderation tools — AWS Bedrock Guardrails, Azure AI Content Safety, Lakera Guard, NeMo Guardrails, and Llama Guard —Thu, 14 May 2026 00:00:00 GMTguardrailscontent-filterllm-securityjailbreakprompt-injectiontoolingGuardML Editorialhttps://guardml.io/posts/llm-alignment-2/https://guardml.io/posts/llm-alignment-2/Practitioners rely on alignment benchmarks that miss the attack surface that matters: agentic tasks, implicit harm, and low-resource languages.Thu, 14 May 2026 00:00:00 GMTalignmentevaluationbenchmarksagentic-aimultilingualguardrailsGuardML Editorialhttps://guardml.io/posts/ai-safety-tools/https://guardml.io/posts/ai-safety-tools/A practitioner's breakdown of the leading AI safety tools — NeMo Guardrails, LLM Guard, Llama Guard, and managed platforms — with benchmark data, knownTue, 12 May 2026 00:00:00 GMTguardrailsllm-securityai-safetycontent-filterdefense-in-depthGuardML Editorialhttps://guardml.io/posts/weekly-how-to-compress-kv-cache-in-rl-post-training-shadow-mask-dis/https://guardml.io/posts/weekly-how-to-compress-kv-cache-in-rl-post-training-shadow-mask-dis/A new preprint argues that compressing KV cache during RL rollouts silently biases the policy you ship. For teams treating RLHF as a defensive controlTue, 12 May 2026 00:00:00 GMTalignmentrlhfkv-cacherlaifdefense-in-depthtraining-infraGuardML Editorialhttps://guardml.io/posts/chatgpt-safety/https://guardml.io/posts/chatgpt-safety/ChatGPT safety explained: how RLHF, Rule-Based Rewards, safe-completions, and the Moderation API work, plus the jailbreaks that defeat each layer.Mon, 11 May 2026 00:00:00 GMTchatgptguardrailscontent-filterjailbreakalignmentbypassGuardML Editorialhttps://guardml.io/posts/llm-alignment/https://guardml.io/posts/llm-alignment/LLM alignment trains models to internalize safety constraints — but every technique has documented bypass paths.Mon, 11 May 2026 00:00:00 GMTalignmentrlhfconstitutional-aidpoguardrailsfine-tuningGuardML Editorialhttps://guardml.io/posts/llm-guardrails-2/https://guardml.io/posts/llm-guardrails-2/A practical comparison of LLM guardrail implementations — classifiers, rule engines, LLM judges — with empirical bypass rates and deployment patterns thatMon, 11 May 2026 00:00:00 GMTllm-guardrailsguardrailscontent-filterprompt-injectiontoolingdefense-in-depthGuardML Editorialhttps://guardml.io/posts/llm-guardrails/https://guardml.io/posts/llm-guardrails/LLM guardrails are the control layer between a language model and the real world. This guide covers how they work, how they fail under adversarialMon, 11 May 2026 00:00:00 GMTllm-guardrailscontent-filterprompt-injectionjailbreakdefense-in-depthguardrailsGuardML Editorialhttps://guardml.io/posts/llm-safety/https://guardml.io/posts/llm-safety/LLM safety spans alignment training, inference-time guardrails, and external filters — each with known failure modes.Mon, 11 May 2026 00:00:00 GMTllm-safetyguardrailsalignmentjailbreakdefense-in-depthcontent-filterGuardML Editorialhttps://guardml.io/posts/llm-security-tools/https://guardml.io/posts/llm-security-tools/A working guide to LLM security tools for 2026 — covering red-teaming frameworks, runtime guardrails, and observability layers, with honest notes on whatMon, 11 May 2026 00:00:00 GMTllm-security-toolsguardrailsred-teamingprompt-injectiondefense-in-depthtoolingGuardML Editorialhttps://guardml.io/posts/model-alignment/https://guardml.io/posts/model-alignment/Model alignment trains AI systems to follow human intent rather than optimize for proxy metrics. Here's what the main techniques actually do, how they'reMon, 11 May 2026 00:00:00 GMTalignmentrlhfreward-hackingconstitutional-aidefense-in-depthllm-securityGuardML Editorialhttps://guardml.io/posts/content-moderation-ai-tools/https://guardml.io/posts/content-moderation-ai-tools/A practitioner's comparison of leading content moderation AI tools — OpenAI Moderation, Azure AI Content Safety, Llama Guard 4, NeMo Guardrails, and moreSun, 10 May 2026 00:00:00 GMTcontent-moderationguardrailsllm-safetyai-toolsfilteringGuardML Editorialhttps://guardml.io/posts/ai-content-filter/https://guardml.io/posts/ai-content-filter/A practitioner's breakdown of AI content filter approaches — classifier-based, LLM-as-judge, and guard models — with honest coverage of bypass techniquesSat, 09 May 2026 00:00:00 GMTcontent-filterguardrailsllm-safetybypassdefense-in-depthGuardML Editorialhttps://guardml.io/posts/output-classification-pii-secrets-detector/https://guardml.io/posts/output-classification-pii-secrets-detector/Most output filters catch the obvious cases and miss the long tail. Here's how to build an output classifier that's actually deployable in production.Thu, 07 May 2026 00:00:00 GMToutput-filteringpii-detectionsecrets-detectionllm-securitydetection-engineeringGuardML Editorialhttps://guardml.io/posts/content-moderation-tools/https://guardml.io/posts/content-moderation-tools/A practitioner's guide to the leading content moderation tools for LLM applications—OpenAI Moderation API, Llama Guard, Perspective API, andTue, 05 May 2026 00:00:00 GMTcontent-moderationguardrailsllm-safetytoolingdefense-in-depthGuardML Editorialhttps://guardml.io/posts/weekly-updating-our-model-spec-with-teen-protections/https://guardml.io/posts/weekly-updating-our-model-spec-with-teen-protections/OpenAI's December Model Spec adds Root-level Under-18 Principles that bind the model even against jailbreak framing.Tue, 05 May 2026 00:00:00 GMTmodel-specage-gatingguardrailsroleplay-jailbreakpolicy-hierarchyopenaiGuardML Editorialhttps://guardml.io/posts/ai-content-moderation/https://guardml.io/posts/ai-content-moderation/A technical breakdown of AI content moderation for LLM applications — how classifier-based guardrails work, the bypass techniques that defeat them, andSun, 03 May 2026 00:00:00 GMTcontent-moderationguardrailsllm-safetyjailbreakllama-guarddefense-in-depthGuardML Editorialhttps://guardml.io/posts/updating-our-model-spec-with-teen-protections/https://guardml.io/posts/updating-our-model-spec-with-teen-protections/OpenAI's December 18 Model Spec adds Under-18 Principles, an age-prediction classifier, and real-time moderation across modalities.Sun, 03 May 2026 00:00:00 GMTguardrailsopenaimodel-specteen-safetyage-verificationmoderationGuardML Editorial