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Backed byYCombinator

RL Environment for Agentic Tool-Use

Powering frontier AI labs with managed environments and premium data

Talk to Researcher
For AI Labs
Problems We Solve
Managing test accounts
Streamlined account management
Hours of test data setup
Instant state initialization
No visibility into AI actions
State export for verification
Slow manual cleanup
One-click reset & teardown
Sequential, blocking runs
Isolated, parallel runs

MCP sandboxes
for LLM training

Fully managed live MCP sandbox environments for training and evaluating AI models on agentic tool use. We handle auth, state resets, and parallel isolation—supporting 1,000+ concurrent runs so you focus on building better models.

300+ MCP Servers
Full Server Fidelity
High-Quality Initialization Data
RL Training Ready
View Sandbox API docs
For AI Labs
Challenges We Solve
Tasks too clean and simple
Noisy, ambiguous real-world tasks
Data inconsistent across tools
Logically consistent multi-tool data
Scenarios hard to scale
Scalable, diverse scenarios
Static, predictable environments
Interruptions & notifications

Ultra realistic environments
for RL training

Simple tasks don't prepare agents for production. Train on complex, long-horizon workflows in environments that mirror the real world.

Long-Horizon Tasks
Multi-Tool Workflows
Real-World Dynamics
Scalable by Design
Learn more

Loved by builders

Discover what our community has to say about their Klavis experience.

Model Context Protocol (MCP)

Model Context Protocol (MCP)

@MCP_Community

“the entire @Klavis_AI team for turning complex MCP infrastructure into plug-and-play simplicity. Enterprise-grade tools without the enterprise headaches!”

Fireworks AI

Fireworks AI

“Today, we are launching and open-sourcing Eval Protocol: a framework to run RL directly on your production agents. EP brings the training loop to your agent wherever it lives—with day-0 integrations including Klavis AI (YC X25)—streams traces back, and computes rewards to update the model.”

Guillermo Flor

Guillermo Flor

Founder @The AI Opportunity

“Xiangkai built the tool-calling infra at Google Gemini — before MCPs even existed 🤯 He saw the limits of traditional APIs for agents. And knew the real unlock wasn't smarter models”

CrewAI

CrewAI

“Automate your next sales follow-up! All powered by CrewAI + Klavis AI (YC X25) MCP — no manual coding of OAuth flows, no glue scripts.”

Llamaindex

Llamaindex

“Build AI agents that connect to YouTube, Gmail and other services in just a few lines of code using LlamaIndex and @Klavis_AI's MCP servers!.”

Together AI

Together AI

“Congrats to the Klavis AI (YC X25) team! Now you can use Together AI + MCP servers to securely connect tools like Salesforce & Gmail and let AI run real workflows.”

Compliance

We are SOC 2 Type II and GDPR compliant, ensuring enterprise-grade security for your data.

SOC 2 Type II CompliantGDPR Compliant

Investors

We've raised seed round from the best firms including HSG (formerly Sequoia China) and Y Combinator.

HSGY Combinator

Power Your Tool-Use Training & Eval with Klavis

Talk to Researcher
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