For agents & LLMs
The undo button
for AI.
Agents act. Sometimes they act badly. Fast captures state before every run so "undo the last 47 tool calls" is a real, reliable operation — not a prayer.
Checkpoints
Capture the whole
moment.
Files, conversation state, and tool state — versioned together in one structured checkpoint, automatically, before an agent touches anything.
Rollbacks
Diff-aware, precise,
reversible.
Roll back exactly what an agent changed and nothing else. Structured diffs mean you can review before you revert — and revert the revert.
Agent API
Checkpoint, diff, and rollback verbs with idempotency keys, dry-run flags, and machine-readable errors.
Integrations
MCP server, LangChain, Cursor and more — Fast plugs into the tools your agents already run on.