Silmaril
Runtime security for AI that self-improves
About Silmaril
Silmaril is the first runtime security for AI that self-improves. It understands application context to block 2x as many threats as current SOTA defenses with 10x lower latency. Customers plug us into agentic frameworks like LangGraph with 5 lines of code. Silmaril has stopped $28M of damages for customers.
Public traction evidence
Each signal links to the public source used for attribution.
- X
Garry Tan post about Silmaril prompt injection defense
Garry Tan wrote that Silmaril (misspelled Simaril) YC Spring 2026 is SOTA prompt injection defense for LLMs.
- X
Garry Tan reply about using Silmaril
Garry Tan replied that he uses Silmaril for shell-level prompt injection and infiltration blocking.
- LinkedIn
Grey Baker post about Silmaril
Grey Baker highlighted Silmaril and its work on prompt-injection defense.
- YouTube
Silmaril: The world's first self-healing prompt injection defense
Learn about the firewall and book a call: silmaril.dev