agentkit-jsEdge-native agent runtime

Three-tier sandboxed code execution · prompt-cache cost control · first-class Chinese model support · ships to Cloudflare Workers.

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Why three sandbox tiers?

GitHub

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Three-tier code execution

VmKernel (in-process), QuickJS / Pyodide / Wasmtime (true WASM, edge-safe), RemoteSandboxKernel (E2B / CF Sandbox microVMs). Drop-in interchangeable. No other framework ships all three.

Decision tree

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Prompt-cache cost control

Auto cache breakpoints, 1-hour TTL, per-TTL usage metering. Verified –86% tokens in CI-gated benchmark.

See benchmarks

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Chinese models, first-class

Doubao, DeepSeek, Kimi, Qwen, GLM, MiniMax. Each adapter handles thinking modes + cache strategies + reasoning fields correctly. None of the Western frameworks ship these.

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Time-travel debugger

EventLogReplay + opt-in <DevTools/> React UI. Step replay any agent run, fork from any step. Tiny opt-in package.

Open guide

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Durable runtime

Checkpoints, SSE Last-Event-ID resume, stateless human-in-the-loop. Backends - CF KV, Durable Objects, Redis, Upstash.

Architecture

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Honest, CI-gated benchmarks

Every percentage in the README is reproduced in CI - drift outside ±10 % fails the build. No bit-rot.

See the numbers

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Pareto-first model evaluation

@agentkit-js/evals-runner ships six benchmark suites and paired statistics (McNemar / Wilson / bootstrap) — multi-model comparisons surface trade-off fronts, not single-number ranks.

Open guide

Apache-2.0 · vs Vercel AI SDK / Mastra / LangGraph