DarwinLoop
Your AI Agents smarter at each user interaction
DarwinLoop is an open-source Python and Node.js library that detects implicit user feedback signals, computes prompt quality metrics, and autonomously evolves your agent's prompt — without touching your infrastructure, storing conversations, or requiring labeled data.
You ship your agents. And they stay just the way they are.
Evolving your agents is expensive
Reading conversation logs to find failure patterns is economically irrational at production volume.
Most of your complaining customers get ignored
Every re-prompt, correction, and session abandoned by users is diagnostic data. Today it vanishes on every turn.
Prompts don't age well
Production agents accumulate failure modes silently. There's no alert when your prompt starts degrading.
Finally an easy way to close the loop
Click a step to see how it works.
One wrap call. Your agent now evolves itself.
import darwin
agent = darwin.wrap(
agent=my_agent, # any LangChain, OpenAI, Anthropic agent
agent_id="support-bot",
llm_api_key=OPENAI_KEY # BYOK — for the mutation engine only
)
# That's it. Darwin runs in the background.
# Your agent now evolves autonomously.Production-grade primitives, not a science project.
Privacy by design
Raw conversations never leave your process. Darwin stores hashes and anonymized summaries only.
Three mutation levels
Injection (session-scoped), Soft Edit (auto-apply to new sessions), Hard Edit (GitHub PR for human approval).
Local-first
SQLite by default. PostgreSQL/Supabase via pluggable interface. No SaaS dependency. pip install and go.
Statistical validation
Fisher exact test, Student's t-test, or threshold-based. Configurable. Mutations only promote when provably better.
Genetic Evolutionary Algorithm mutation engine
Prompt evolution via reflective reasoning + Pareto-optimal candidate selection. The algorithm that beat Claude Opus 4.1 on enterprise benchmarks at 90× lower cost.
Join the waitlist for DarwinLoop
We're onboarding teams in small batches. Drop your email and we'll send you an invite as soon as a slot opens up.
No spam. One email when you're in.