Open SourceFrameworkFree
Eve
Vercel's filesystem-first framework for durable backend AI agents: an agent is a directory (agent.ts for the model, instructions.md for the prompt, typed tool files, skills, channels, schedules). Tools can gate themselves behind human approval (needsApproval) and you test the agent with file-based evals (defineEval). Apache-2.0; production plumbing rides Vercel (Workflow, Sandbox, AI Gateway).
2 workflows use Eve
AgentsFreeMachine-verified
Eve: gate the dangerous tool behind a human, in one field
Make an Eve agent's irreversible tool stop and wait for a person above a threshold, using the needsApproval predicate, and verify the file is shaped right before you trust it.
Eve· intermediate
AgentsFreeMachine-verified
Eve: make evals the deploy gate, not a vibe check
Write a file-based Eve eval that asserts a large refund routes through approval, and wire eve eval into CI so a prompt change can't ship a regression.
Eve· intermediate