Claude Code harnesses for product managers. Free, public, on your own Mac.
productagent.dev is a free, public library of 8 Claude Code harnesses for product managers and operators: skills, agents, shell scripts on a schedule, a permissions fence and a Telegram bot. The flagship, Loops, lets an agent keep working while you sleep. You give each loop a goal, a budget, a cadence and a model. Loops runs on your Mac and the Claude or ChatGPT plan you already pay for, stays inside a fence it cannot climb, and leaves four plain lines per loop in the morning. Install Loops with one line: curl -fsSL https://productagent.dev/install.sh | bash
Who productagent.dev is for
Product managers who already run part of the day in Claude Code or Codex.
Founders and operators with more projects than evenings.
Anyone who wants an agent to keep working overnight without handing it the keys.
What you get: 8 harnesses
Each harness is a folder you can read before you run it. Open one to see every file.
flow-design (global): A progressive design interview: one question per screen, ending in a clickable HTML prototype of a linear user journey (onboarding, checkout, wizard).
loops (system): Give an agent a goal, a budget, a cadence and a model. It works one bounded run at a time while you sleep, inside a fence, and hands you four plain sentences in the morning.
prototype-swarm (global): Crawls a multi-screen HTML prototype for undefined click destinations and spawns one generator agent per missing screen, with a handoff packet written by the source screen, until the click graph is covered.
self-maintenance (system): The one way an unattended run may touch its own loop registry, and the one place a "need from you" becomes a decision you settle with a single command instead of a paste.
pm-strategist (global): A product and strategy advisor agent that blends three lenses (build taste, business structure, PM execution) and pressure-tests ideas instead of cheerleading.
todo (system): A TODO list for PMs in one markdown file, reachable from Claude Code and from Telegram: capture, see what's due, triage, and hand items to an agent that asks before it acts.
rev-intel-harness ↗ (link): A CSV of companies in, the people out: point your existing AI subscriptions at target accounts. Open source, MIT.
karma ↗ (link): A personal knowledge graph over everything the loops write: seeds in, relationships out, so a month of night reports stays searchable. Open source, MIT.
What Loops leaves you in the morning
## L-03 — Ship one fix
- Trying to: ship the "sort permits by county" backlog item.
- Did: added the county filter; the page renders in a headless browser.
- Decided: left the mobile layout alone; separate backlog item.
- Need from you: merge branch night/2026-09-14 if the screenshot looks right.
Four words run the whole system. A Loop is work with a goal that renews itself. A Run is one bounded pass at a loop. An Order is a one-off instruction for tonight. A Decision is anything a run could not settle; the run hands the decision back to you instead of guessing. Read the full concept page at harnesses/loops/README.md, and the runner and fence at MACHINE.md.
INSTALL
INSTALL LOOPS · MACOS · RUNS ON THE PLAN YOU ALREADY PAY FOR
I use
Pick one and the steps below adapt. Either way it runs on your own Mac, on your own subscription, and nothing phones home.
Want one skill, not the whole machine? Copy a skill folder (for example flow-design) into ~/.claude/skills/, or an agent file (for example pm-strategist) into ~/.claude/agents/. Restart Claude Code and the skill or agent shows up.
How productagent.dev is made
Harrison Johnson, a product manager, runs these harnesses on real projects every day and night. Each harness gets copied off Harrison's machine, scrubbed of personal paths, budgets and client names, and published here as a folder. Claude Code wrote most of the code and much of the prose; Harrison makes the calls on what ships and what the rules are. Every example on the site is synthetic. No live data from Harrison's machine lands here.
The site reads the GitHub repository at build time, so productagent.dev and the repo always match. Want the case for loops in the words of the people building Claude Code? Read why.
Questions people ask
What is a Claude Code harness?
A harness is anything written down that tells Claude Code how to do a repeated job: a skill (a SKILL.md folder), an agent definition, a slash command, a permissions fence, a set of shell scripts on a schedule, or a whole bot. productagent.dev publishes the harnesses one product manager runs every day, as the folders they are.
Is productagent.dev free?
Yes. Every harness is a public folder on GitHub. Loops runs on the Claude or ChatGPT plan you already pay for. productagent.dev sells nothing and has no paid tier.
How do I install a harness?
Loops installs with one line in the macOS Terminal: curl -fsSL https://productagent.dev/install.sh | bash. For a single skill or agent, copy its folder into ~/.claude/skills (skills) or its file into ~/.claude/agents (agents), then restart Claude Code.
What is Loops?
Loops lets an agent keep working on a goal while you sleep. You set four knobs per loop: a goal, a budget, a cadence and a model. Each night the runner does one bounded run per loop inside a fence, then writes four lines per loop: what it was trying to do, what it did, what it decided, and what it needs from you.
Is it safe to let an agent run unattended?
Loops is built around that question. Each run has a dollar budget and a timeout. A fence of Claude Code permissions allows a short list of actions and blocks git push, rm, shells and edits to the loops file. The runner keeps its own list of every blocked call and prints the list under the morning report, so the agent cannot hide what it tried. Nothing runs until you write a loop, and --off unloads the schedule.
Does it work with Codex or ChatGPT?
Loops runs Claude Code or Codex on your own Mac, on your own subscription. The skills and agents target Claude Code.
Does anything leave my machine?
No. Loops runs locally, writes its reports to local files and sends no telemetry.