Six stacks worth stealing

Each one is a full set of answers for a shape of problem someone has already had. Take it as-is, or open it in the builder and change the two things that differ for you.

Weekend prototype

Smallest thing that is still honest. Local, cheap, no accounts beyond one model key.

setup.shBuild sheetJSON
harnessClaude Code
modelAnthropic
memoryPostgres (rolled by hand)
retrievalChroma
searchTavily
toolsMCP (Model Context Protocol)
securityRebuff + No isolation (host process)
observabilityArize Phoenix
runtimeDocker Compose

Customer-facing support agent

Talks to strangers, remembers them, and is assumed hostile-adjacent by default.

setup.shBuild sheetJSON
harnessClaude Agent SDK
modelAnthropic
frameworkVercel AI SDK
memoryZep
retrievalturbopuffer
searchExa
toolsComposio
securityLakera Guard + Microsoft Presidio + iron-proxy
observabilityLangfuse
runtimeVercel

Regulated / on-prem

Nothing leaves the estate. Every component runs on infrastructure you control.

setup.shBuild sheetJSON
harnessLetta
modelvLLM
frameworkLangGraph
memoryPostgres (rolled by hand)
retrievalpgvector
searchSearXNG
toolsMCP (Model Context Protocol)
securityMicrosoft Presidio + NeMo Guardrails + Kata Containers + iron-proxy
observabilityLangfuse
runtimeKubernetes

Long-running operations agent

Runs for hours, survives deploys, and stops to ask a human before it spends money.

setup.shBuild sheetJSON
harnessClaude Agent SDK
modelAnthropic
frameworkLangGraph
memoryMem0
retrievalQdrant
searchExa
toolsArcade
securityAuth0 for AI Agents + Lakera Guard + iron-proxy
observabilityBraintrust
runtimeTemporal

Research analyst

Reads the whole internet, writes something with citations, runs code to check itself.

setup.shBuild sheetJSON
harnessClaude Agent SDK
modelAnthropic
frameworkPydantic AI
memoryCognee
retrievalLanceDB
searchExa
toolsFirecrawl
securityGuardrails AI + E2B + iron-proxy
observabilityPydantic Logfire
runtimeModal

Browser automation

Drives real web apps that have no API, on behalf of a specific signed-in user.

setup.shBuild sheetJSON
harnessClaude Agent SDK
modelAnthropic
frameworkMastra
memoryMem0
retrievalpgvector
searchFirecrawl
toolsBrowserbase
securityDescope Agentic Identity + gVisor + iron-proxy
observabilityLangfuse
runtimeFly.io
· For agents/ This page, machine-readable

Every page here answers to Accept: text/markdown and returns the same content at roughly a tenth the tokens. No separate site, no toggle — same URL.

curl -s -H "Accept: text/markdown" https://newagent.build/stacks