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First-party catalog#

Reference material for what PluggableHarness Agent ships or studies first-party: capability reports on the four first-party model vendors and twenty-two tool capabilities common to coding agents, plus design documents for the frontends it ships.

Important

These documents are descriptive, not normative. The protocol contracts — what a plugin MUST implement — live in the specifications; each report here cross-references the governing spec by heading anchor.

  • Model providers — Anthropic, OpenAI, Google (Gemini), and xAI (Grok): model rosters, reasoning and prompt caching, wire formats and auth, with confirmed-versus-uncertain data called out honestly per vendor.
  • Tools — file I/O, search, shell execution, web access, orchestration, memory, and more, each mapped to its place (or deliberate absence) in the tool reference catalog.
  • Frontends — the display surfaces themselves: how a concrete frontend resolves the layout, focus, keymap, and resize questions the frontend protocol deliberately leaves to the implementation.