Harness — Tiny apps for agents and humans

Backlog

Project management for humans and agents.

$14.99

A kanban board both you and the agent can see. Cards move through Backlog, Active, Review, and Done. Set dependencies between cards. The agent reads the board, creates cards, moves them forward — and knows what's blocked.

Drag cards between columns or let the agent do it via the API. A built-in dependency graph shows what's ready and what's waiting. Timeline view tracks everything that happened.

Endpoint

GET localhost:43123/api/projects POST localhost:43123/api/cards {"projectId":"...","title":"...","status":"backlog"} PATCH localhost:43123/api/cards/:id {"status":"active","dependsOn":["..."]}

A shared list between you and the agent. Two columns — things to do, and things not to do.

The agent can read both columns but can only write to the first. The "don't" list is yours alone — guardrails the agent can see but can't change.

Endpoint

GET localhost:3143 POST localhost:3143 {"todo":["ship it","fix the bug"]}

The agent leaves a question. You answer whenever you want. No blocking, no interruptions.

Questions queue up with a pulsing dot while they wait. The agent posts and moves on — it can check back later, or not. Like email between you and your code.

Endpoint

POST localhost:3145 {"question":"should I refactor this?"} GET localhost:3145/1 → {"answer":"no, just ship it"}

The agent sends an alert — critical, urgent, or concerning. The app yells for you. The message appears.

For the things that shouldn't wait. A deploy stuck for 12 minutes. Memory at 94%. A test that's been failing silently. Stay on top of failures.

Endpoint

POST localhost:3144 {"level":"critical","message":"deploy stuck"}

A pomodoro timer the agent can check. Set a duration, start the clock, and the agent knows how much time is left.

Give it a deadline — "you have 25 minutes to finish this refactor." The agent can query the remaining time and prioritize accordingly.

Endpoint

GET localhost:3142 → "18:32 work"

One button. Kills the agent process. Choose Claude, Codex, or both.

A kill switch. No confirmation dialog, no "are you sure." You pressed the button, so you're sure. The process is dead. Start a new one when you're ready.

Press Cmd+Shift+Space from anywhere. A small floating bar appears. Type a thought, press Enter. It's saved to ~/thoughts.md with a timestamp and the window disappears.

For the things that cross your mind while the agent is working. Ideas, reminders, things to revisit later. Press Escape to dismiss without saving.

An app for humans. A circle that expands and contracts. Four seconds in, seven seconds out.

Don't hyperventilate after your agent deletes your prod db. Just breathe.

Setup — the most important step