StartupY Combinator (P26)
Ardent
Database sandboxes for you and your coding agents, so agents test against a realistic Postgres.
Ardent gives coding agents Postgres database sandboxes. Its founders argue that without "a realistic sandbox at the DB layer for testing, they ship garbage that can take down production databases." The Y Combinator Spring 2026 company launched on Hacker News in May 2026.
Neighbours in the directory
San Francisco, CA · Est. 2022
The data framework for connecting agents to your data.
LlamaIndex provides ingestion, indexing and retrieval primitives that give agents grounded context over enterprise data — a foundational piece of the retrieval side of the harness stack.
Prague, Czechia · Est. 2023
Open-source sandboxes for running AI-generated code.
E2B gives agents secure, isolated cloud micro-VMs to execute code and commands — the execution runtime layer of the harness, used by many coding and data-analysis agents.
Est. 2023
Elastic sandboxes for running AI-generated code.
Daytona provides secure, OCI-compatible sandbox 'computers' that spin up in under 90ms — with snapshots for persistent agent state. In 2026 it moved core development to a private codebase while continuing to run as a commercial platform.
Sources
Verified Oct 29, 2026