Give it context
State, history, files, and the right information at the right moment.
Designed for people in the loop
Build agents
people can work with.
Ayjnt is an agent harness framework for building capable agents with a browser interface, a terminal interface, and a safe path to the host.
bunx ayjnt new my-agent browser
localhost:8787/code/demo
Agent is workingReading src/runtime/tools.ts
ready when you are
terminal
› fix the failing bridge test ✓ 3 files updated you
Why a harness? Intelligence is only
Intelligence is only
part of the system.
A model can reason. A harness makes that reasoning useful: it gives the agent tools, context, memory, boundaries, observability, and a place for people to step in.
Give it capabilities
Tools that run near the agent or cross the bridge to the host.
Give it boundaries
Isolation, explicit permissions, and human approval for meaningful actions.
Keep people present
A useful interface for directing, inspecting, and collaborating with the agent.
Architecture The right runtime
The right runtime
for each kind of work.
Isolation where agents reason. Native capability where work touches the machine. A typed, permission-aware bridge between them.
Human You choose the interface
app.tsx browser cli.ts terminal 01
Agent runtime Safe, stateful, instant.
Agents run in workerd V8 isolates, with durable state, scheduling, workflows, and agent-to-agent RPC.
typed bridge tools cross with explicit permissions
02
Host runtime Close to the machine.
Host actions run in Bun, where agents can work with files, shells, databases, processes, and local connectors.
Human You choose the interface
app.tsx browser cli.ts terminal requests
01
Agent runtime · workerd Safe, stateful, instant.
Agents reason in isolated V8 environments with durable state, scheduling, workflows, and agent-to-agent RPC.
typed bridgetools cross with explicit permissions
02
Host runtime · Bun Close to the machine.
Host actions work with files, shells, databases, processes, and local connectors.
Human interfaces Every agent gets
Every agent gets
a front door.
The interface lives beside the agent, not in a separate product. Create the surface that fits the moment—or provide both.
Browser
app.tsxTyped, realtime React UI co-located with the agent it controls.
bridge tests2,814 tokens
Find the race in the host bridge and fix it.
AY
I found a pending request that can outlive its connection. I’m adding cancellation and a regression test.
✓
edit src/core/hostBridge.tsTerminal
cli.tsFull-screen, scriptable, and close to the files and tools developers already use.
ayjnt-code~/projects/ayjnt
you clean up the docs and examples
agent I’ll inventory the current site first.
● Search examples/** 24 results
● Read docs-astro/src/pages/index.astro
agent There are three overlapping scheduling examples. I’ll consolidate them into one practical brief agent.
›
Examples Six real starting points.
Six real starting points.
No catalog filler.
Each example teaches a distinct harness pattern and includes a human interface you can run, inspect, and adapt.
01↗
Coding harness
A full-screen terminal coding agent with browser-visible sessions, transcripts, and token usage.
OpenTUIBun hostapp.tsx
02↗
Realtime voice
A Gemini-powered conversation with a fluid audio-reactive sphere that turns green while listening.
Geminiaudioapp.tsx
03↗
Chess arena
Play an agent or let two providers play each other. Bring OpenAI, Gemini, Claude, or Ollama.
multi-providerstateapp.tsx
04↗
Endpoint monitor
Check an HTTP endpoint once, on an interval, or with cron and inspect status, latency, and response history.
schedulingstatenotifications
05↗
Content review
A useful approval workflow that researches, drafts, pauses for a human, and publishes after approval.
workflowapprovalapp.tsx
06↗
Research team
A lead agent delegates investigation, fact-checking, and synthesis to focused agents and shows the handoffs.
multi-agentRPCobservability
Start building From idea to running agent
From idea to running agent
in four commands.
Start locally. Add a browser UI, a terminal UI, or both. Deploy the agent runtime only when you need the cloud.
Read the quickstart →bunx ayjnt new my-agent
cd my-agent
bun install
bun run dev