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PRODUCT · AGENTS

One agent.
Brilliant at one job.

An agent is a small, specialized worker: prompt + tools + memory + evals. Grain gives you the full loop — edit, test, ship, observe, improve.

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T
Triage
@grain/support/triage · v0.18 · sonnet-5.0
● prod9/10 evals
PROMPT
You triage incoming support tickets. Read the ticket, decide intent, route to one of: billing, tech, account, human. Set priority 1–5.
TOOLS
kb.search()
customer.lookup()
ticket.tag()
slack.notify()
MEMORY
session
per-ticket
long-term
customer-profile
LIVE RUN · 4s ago● 312ms
→ input
"Charged twice on Feb 4, please refund"
thinking
duplicate-charge pattern · billing
tool kb.search("duplicate charge")
← 3 matches, top 0.94
decision
{ route: "billing", priority: 2 }
tokens
1,284
cost
$0.003
latency
312ms
THE ANATOMY

Four pieces. That's it.

✎

Prompt

The brief it listens to. Structured, typed, versioned.

⚙︎

Tools

Functions, MCP servers, other agents. Typed args.

◔

Memory

Per-run, per-session, per-customer. You choose.

✓

Evals

Golden cases. Run on every change. Block regressions.

EVALS · AS CODE

Trust, verified every commit.

Golden cases live in git alongside the agent. Grain runs the full suite on every change. Regressions block deploy. Green = ship.

evals/triage/*.json · run #28419/10 passing
refund → billing
pass · 98% confidence
outage → tech, p1
pass · 94%
angry customer → human
pass · 91%
unknown intent → human
fail · routed to billing
multi-charge refund
pass · 96%
partial refund decline
pass · 89%
account locked → account
pass · 92%
MODEL-AGNOSTIC

Switch models like that.

Local CLIs on your machines — Claude Code, Codex, Grok CLI, Gemini CLI, Kimi Code, OpenCode, Nico Code — plus frontier APIs (Opus, GPT, Gemini, Grok) and open weights. One dropdown. Route per agent.

Claude Fable 5
Opus 4.8
Sonnet 5
Nico 2.5
GPT 5.6 SOL
GPT 5.6 Luna
Grok 4.5
Kimi K3
Gemini 3 Pro
DeepSeek V4
your own model

Build your first agent.

Free forever for solo devs. No credit card.

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Grain

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