Topic

Prompt injection

5 articles on this topic from the NullSquare blog.

AI security

MCP security: threat model, risks, and production tests

August 28, 202614 min read

MCP security: threat model, risks, and production tests

A production-focused MCP security guide that turns tool poisoning, authorization, state, token, and runtime risks into explicit security boundaries and reproducible tests.

AI security Agent security Security testing Prompt injection

Agent security

AI agent memory needs its own security boundary

July 26, 20266 min read

AI agent memory needs its own security boundary

Persistent memory turns one hostile input into a cross-session risk. Secure the write, retrieval, action, and recovery paths as one system.

Agent security AI securityMemory poisoningPrompt injection Security testing

AI security

Persona is the hidden variable in agent behavior

July 4, 20264 min read

Persona is the hidden variable in agent behavior

NullSquare open-sourced Agent Behavior Lab so teams can measure how personas, tool definitions, histories, and model families shift agent safety.

AI security Prompt injection Agent security Model governance Security testing

AI safety

The Fable ban is really a scope-control warning

June 20, 20263 min read

The Fable ban is really a scope-control warning

Anthropic Fable 5 showed the hard truth of frontier AI safety: stronger coding and bug-finding models are also stronger cyber systems.

AI safetyPrompt injectionCyber capabilityModel governance Security testing

Prompt injection

Prompt injection testing has to leave the chat box

March 21, 20261 min read

Prompt injection testing has to leave the chat box

AI security testing works best when prompt injection is tested across documents, tools, memory, permissions, and real workflow boundaries.

Prompt injection AI security Agent securityScope control