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  feat: first-class skill packs on agents + ship gifsmith builtin

  steve released this 2026-07-05 05:05:58 +00:00 | 16 commits to main since this release

  Lifts the 'an agent uses a SKILL.md pack' concept out of a host and into the
  harness:

  • run.Ports.SkillPacks (SkillPackActivator) — nil-safe port; the executor folds
    a loaded agent's pack catalog into the system prompt and adds a skill_use
    loader tool to the toolbox (uses the existing ra.SystemPrompt + toolbox seams)
  • run.RunnableAgent.SkillPacks + persona.Agent.SkillPacks (+ skill_packs YAML,
    extends-inherit, ToRunnable) — the Agent noun is now pack-aware
  • skillpack.Activator — the battery's default port impl (resolve names → packs →
    catalog + skill_use), with a per-run BundleStager factory the host plumbs;
    satisfies the port structurally (no import of run)
  • agentbuiltins: ships gifsmith, a portable focused GIF/MP4 render agent that
    uses the gif pack — references tool/tier/pack NAMES only, no host coupling

  A host now wires run.Ports.SkillPacks instead of carrying its own activation
  glue. Tests: Activator resolution + gifsmith loads through persona→RunnableAgent.

  Co-Authored-By: Claude Opus 4.8 [email protected]

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