cobaya

Cobaya Assistant (Claude Code plugin)

Specialized Claude Code assistance for the Cobaya cosmological Bayesian-analysis framework.

What you get

• /cobaya:explain — passive knowledge skill: cobaya conventions, likelihood/theory skeletons, sampler config, debug order. Auto-loads when the conversation is about cobaya, MCMC convergence, Planck likelihoods, getdist, etc.
• /cobaya:setup-run <name> [likelihoods] — sets up and executes a full cobaya MCMC run end-to-end. Forks into the cobaya-engineer subagent so install/chain logs don't flood the main thread; returns a concise summary.
• cobaya-engineer subagent — specialist subagent for cobaya runs; can be invoked directly from /agents or used as the executor for /cobaya:setup-run.

Install

In any Claude Code session, run these three commands:

/plugin marketplace add https://github.com/borisbolliet/cobaya-claude-plugin.git
/plugin install cobaya@cobaya-claude-plugin
/reload-plugins

After /reload-plugins, /cobaya:explain and /cobaya:setup-run show in /help and the cobaya-engineer subagent appears in the Agent picker.

To update later (after I push a new commit):

/plugin uninstall cobaya@cobaya-claude-plugin
/plugin marketplace remove cobaya-claude-plugin
/plugin marketplace add https://github.com/borisbolliet/cobaya-claude-plugin.git
/plugin install cobaya@cobaya-claude-plugin
/reload-plugins

Try it

/cobaya:explain
What's the right covmat strategy for a Planck+lensing chain?

/cobaya:setup-run lcdm_planck planck_2018_lowl.TT,planck_2018_lowl.EE

Layout

.claude-plugin/marketplace.json   # single-plugin marketplace
plugins/cobaya/
  .claude-plugin/plugin.json      # plugin manifest
  skills/
    explain/
      SKILL.md                    # main knowledge skill
      reference.md                # detailed schema (loaded on demand)
    setup-run/
      SKILL.md                    # forks into cobaya-engineer
  agents/
    cobaya-engineer.md            # the subagent

Notes / open items

• No MCP server. Cobaya's CLI (cobaya-run, cobaya-install, getdist) is invoked directly via the Bash tool. An MCP server only becomes worthwhile if you want a typed tool surface or a long-lived/remote service (warm CAMB process, cluster job submitter).
• Agent reference in context: fork. skills/setup-run/SKILL.md references the subagent as agent: cobaya-engineer. If the plugin namespace isn't picked up automatically, switch to agent: cobaya:cobaya-engineer or whatever the live /agents listing shows.
• allowed-tools on the skills pre-approves cobaya-run, cobaya-install, getdist. Bash invocations that don't match those patterns will still prompt.
• No paths filter on /cobaya:explain — it's available everywhere, auto-loaded by description rather than file context.

License

MIT