Codex
LaunchingFor tightly scoped repository work: small surfaces, precise diffs, fast feedback loops.
The hosted agent harness behind one task API
Codex, Claude Code, and Pi, hosted behind one API. Send a task, follow normalized events, receive the finished artifacts.
What is an agent harness?
It is the layer that turns a raw model into a working engineer: the loop that plans, edits files, runs commands, and checks its own results. You may also see it called a coding harness or an LLM harness. The name is new; the layer is not.
HarnessAny is the hosted agent harness that runs that loop behind one API. You stop babysitting terminals and reconnecting sessions, and get the finished artifact instead.
One taskharness loop, hostedfinished artifact.
One contract. Three harnesses.
Pick the harness that fits the job. Nothing else changes.
Claude Code
LaunchingFor exploratory changes that read a lot of context before they write: refactors, migrations, unfamiliar corners.
Pi
LaunchingFor long-running, tool-heavy tasks where you want steady progress events and a clean final report.
Bring your keys, or bring nothing.
One field in the request decides. Everything downstream stays identical.
BYOK
your model accounts
Platform
supplied by HarnessAny
Same request shape. Same normalized events. Same artifact contract.
One task, three moves.
Choose
A maintained harness and a mode. The only decision on your side.
Send
One request: the task, the harness, the mode, and the artifacts you want back.
Receive
Normalized events while it runs. The finished change, and what happened, at the end.
Account and key setup belongs to the Quickstart that ships with the closed MVP.
The questions that decide whether this is for you.
Early access opens in waves.
Join the hosted agent harness waitlist and get exactly two messages from us: a confirmation, and your invite.