Show HN: Aegis – Open-source pre-execution firewall for AI agents

Every agent framework lets the LLM decide which tools to call at machine speed. There's nothing between the decision and execution - no check, no confirmation. AEGIS intercepts tool calls before they execute: classifies them (SQL, file, shell, network), evaluates against policies, and either allows, blocks, or holds for human approval. One line of code, zero changes to your agent: import agentguard agentguard.auto(" Built-in detection for SQL injection, path traversal, command injection, prompt injection, data exfiltration, and PII leakage.