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build-on-aster is an open-source Claude Code plugin that teaches your AI coding assistant to build on Aster through this API — using your organization’s API key, with no internal access required.

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What it does

With the plugin installed, you can ask Claude Code (or any SKILL.md-aware assistant) to:
  • Build agents — wire up tools, models, knowledge bases, and skills in the right order
  • Stand up knowledge bases — run the full upload → process → search pipeline
  • Run agents — invoke an agent and read back its answer (the POST /chat → poll loop)
  • Maintain at scale — update prompts and tools, and manage agents across many organizations
  • Package skills and manage your org (invitations, tags)
It carries the exact request/response shapes, the gotchas that bite first-time integrators, and behavioral rules (read-before-write, verify-after-mutating) — all validated against this live API.

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Install

1

Add the marketplace and install the plugin

claude plugin marketplace add asterlabs-ai/build-on-aster
claude plugin install build-on-aster@aster
Or run the same from inside Claude Code: /plugin marketplace add asterlabs-ai/build-on-aster then /plugin install build-on-aster@aster.
2

Set your API key

Get a key from Control Hub → Settings → API Access (a 6-month, org-scoped bearer token), then expose it:
export ASTER_API_KEY="<your-key>"
3

Build

Ask your assistant to build something — e.g. “create an agent that summarizes uploaded invoices and put it in a knowledge base.” The plugin handles the API calls, polling, and verification.

View the source on GitHub

asterlabs-ai/build-on-aster — open source (MIT). Read the SKILL.md, file issues, or contribute.

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Prefer a plain skill?

Not using the plugin system? Clone the repo and point any SKILL.md-aware tool at it: 
git clone https://github.com/asterlabs-ai/build-on-aster ~/.claude/skills/build-on-aster
The rest of this API Reference documents every endpoint the plugin builds on.