# Arbor Foundation

> Use when explicitly consulting pinned Arbor evidence for terminal input, follow-output, bounded scrollback eviction and alternate-screen history ownership.

- Skill: `ryan-brosas/arbor-foundation` (Agent Skill, multi-file: 6 files)
- Install (CLI): `npx skillmds@latest add ryan-brosas/arbor-foundation`
- Raw SKILL.md: https://api.skillmd.com/api/skills/ryan-brosas/arbor-foundation/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: ryan-brosas (https://skillmd.com/u/ryan-brosas)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/ryan-brosas/arbor-foundation

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# Arbor foundation

Historical source evidence from [penso/arbor](https://github.com/penso/arbor),
revision `d8d82b7eec6cba3682374875d8f13407c7181ef0`; license: MIT (`LICENSE`).
Local convenience checkout: `<local-checkouts>/arbor`.

Current project source, tests, requirements, and runtime behavior outrank this
projection. This foundation is not a procedure or an exhaustive repository study.

Open [the index](references/index.md), select one capsule answering the active
question, and load only that capsule. Revalidate its source revision and cited
implementation/tests before relying on it. The index records bounded scope,
evidence, execution limitations, and the complete capsule inventory.

## Topic map

- [Control-key/text followup](references/control-text-followup.md): one-shot input deduplication.
- [Delayed output following](references/delayed-output-following.md): scroll policy, session fences, cancellation limits and test-only retry helpers.
- [Bounded scrollback eviction](references/bounded-scrollback-eviction.md): retained-length saturation versus surviving row identity.
- [Alternate-screen history ownership](references/alternate-screen-history-ownership.md): explicit active mode versus saved-buffer storage and detached projection.