The production framework
for AI agents.
CrewAI and LangGraph frame how your agent thinks. agentFast frames everything above that — and stays agnostic about which one runs underneath. This is what a run looks like once it does:
| planning | complexity | medium — budget raised to 30 iterations | — |
| memory | recall | 2 facts about cust_alice | — |
| guardrail | pii:input | 1 email redacted before the model saw it | — |
| llm | claude-sonnet-4-5 | 1 tool call | $0.0031 |
| tool | kb_search | ok · 3 hits · 6ms | — |
| llm | claude-sonnet-4-5 | 1 tool call | $0.0028 |
| tool | order_lookup | ok · ord_1001 · 4ms | — |
| hitl | approval_requested | refund_request — run paused, durably | — |
Not a developer? Start here — no code on that page. Every capability below also opens with a plain-language summary before the technical detail.
Get started
From a clean machine to an agent answering a real ticket.What an agent is, what goes wrong, and why any of this exists. No code.
One command to a running agent, playground and dashboard.
Install into your own project, with the extras per SDK.
Scaffold an agent, point it at your data, gate a risky tool.
What changes and what doesn't across the five adapters.
Build
Make it yours: your tools, your behaviour, your infrastructure.The production layer
The capabilities agentFast frames — identical on every SDK.The four layers, the adapter seam, and the hole at L1.
Checkpoint per iteration; resume from the exact step after a kill.
Pause on risky tools, survive a restart, execute exactly once.
Watch a run live over SSE — tokens, tools, approvals, re-attach.
One error vocabulary, MCP servers by config, agents as MCP servers.
Long-term facts, session buffer, episodic log, and the scratchpad.
Keep long runs inside the model's window instead of failing at it.
Fan out to sub-agents, each with its own context window, under one durable run.
PII redacted before the model sees it, injection defence, limits.
Step trees, cost and latency per step, OTEL and LangSmith export.
A judge that can't be contaminated, and a CI gate that fails closed.