Engineering Log — The Tensorlake Blog

EngineeringJun 24, 2026·6 min read·◆ FEATURED

Accelerating Harbor with Tensorlake.

Tensorlake runs the real task Docker images for Harbor on microVM sandboxes. On Terminal-Bench 2.1 the oracle passes all 89 tasks in 36m 44s — every image published, cold starts in seconds.

Shanshan WangApplied AI · Tensorlake

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Jun 5, 2026Engineering

Tensorlake Sandboxes as the runtime for Claude Managed Agents.Run Claude Managed Agents on Tensorlake Sandboxes: you keep the control of self-hosting, and drop the always-on box. The short version — the server goes away.

Shanshan WangApplied AI · Tensorlake7 min May 13, 2026Engineering

Filter and rank: how we schedule sandboxes across every cloudOne primitive — filter, then rank — runs through statefulness, multi-cloud, BYOC, and the data path. A tour of the scheduler behind Tensorlake's sandbox fleet.

Diptanu Gon ChoudhuryCEO & Co-founder14 min May 1, 2026Engineering

Browser Harness: direct Chrome DevTools Protocol access and a self-healing harness for browser agentsBrowser-use strips their harness to 592 lines and gives the LLM a raw WebSocket to Chrome's DevTools Protocol. When the agent hits a gap, it writes a helper function — and saves it for future runs.

Antonio Jimeno YepesEngineering3 min Apr 30, 2026Engineering

How scaffold design affects coding agent benchmark scores: lessons from DroidContextual instruction injection, per-model tool schemas, and planning/execution splits — the harness decisions behind Droid's 77.3% on Terminal-Bench.

Antonio Jimeno YepesEngineering3 min Apr 29, 2026Engineering

Hermes: the coding agent that gets better the more you use itMost coding agents are stateless. Hermes uses a closed learning loop where the agent creates skills from experience, improves them during use, and builds a persistent model of who you are across sessions.

Antonio Jimeno YepesEngineering3 min Apr 29, 2026Engineering

Pi: a coding agent with efficient system promptingPi keeps its entire system prompt — including all tool definitions — under 1,000 tokens, a 10× reduction over tools like Claude Code or Cline.

Antonio Jimeno YepesEngineering2 min Apr 28, 2026Engineering

ForgeCode: top open source coding agent in Terminal-Bench@2.0ForgeCode reaches 81.8% on Terminal-Bench 2.0 with both Claude Opus 4.6 and GPT-5.4 — a look at what the harness is doing that the model isn't.

Antonio Jimeno YepesEngineering3 min Apr 27, 2026Engineering

Building Sandboxes for Computer UseComputer Use is a tiny loop. The hard part is building the boring, reproducible desktop around it.

BERNARD KOLOBARASoftware Engineer · Tensorlake8 min Apr 24, 2026Engineering

Starting hundreds of sandboxes in parallel, and the design that makes it possible.We replaced reconciliation loops with durable command outbox to scale our sandbox scheduler to start 1000s of sandboxes every second

David CalaveraSoftware Engineer · Tensorlake 9 min Apr 22, 2026Engineering

Tensorlake is now an official Harbor environment runtimeHarbor defines and evaluates terminal tasks. Tensorlake provides the MicroVM execution layer. Together they are a full evaluation stack for CLI agents.

Tensorlake TeamEngineering7 min

Engineering log.