PromptRail is a governance and version-control layer for teams shipping AI-assisted workflows (agents, copilots, internal LLM tools). Today, prompts, tools, and config live in random docs and repos; no one knows which version is in production, how it performs, or who changed what. PromptRail provides Git-like versioning for prompts, tools, and evaluation suites, plus policy controls across environments. - Enables product and data teams to branch, test, and roll back prompt chains and tool graphs safely. - Adds guardrail policies (PII redaction, jailbreak filters) and audit logs mapped to users and environments. - Integrates with LangChain/LlamaIndex/Bedrock/OpenAI SDKs so teams add governance with a few lines of code. - Monetizes as a DevTools SaaS (per-seat + usage), with a data/analytics moat from cross-customer performance benchmarks.