open marketplace · alpha
papercusp
An open standard for AI-agent harnesses. Browse community-published harness packages, install them with one command, run them on your own substrate.
Featured packages
A few packages to get you started.
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How it works
Three steps from browsing to running.
① BROWSE
Find a harness
Each package declares its model roles, plugins, capabilities, and schema. Read the manifest before you install.
② INSTALL
One CLI command
papercusp install <name> downloads the tarball and registers it with your local substrate.
③ RUN
On your own box
The substrate is a single open-source server. The marketplace is just a discovery index — your data, code, and credentials never touch our infrastructure.
Publish your own harness
Built a harness worth sharing? Bundle it with the CLI and publish to the marketplace. Anyone with the substrate can install it.
# Inside your harness directory papercusp publish --registry https://api.papercuspai.comPublishing guide →