## Dirac hash-anchored edit (vendored subset)

- **Project:** https://github.com/dirac-run/dirac
- **License:** Apache-2.0
- **Location:** [`.pi/lib/harness-anchored-edit/`](.pi/lib/harness-anchored-edit/) (anchor state, line protocol, edit resolve/apply)
- **Integration:** [`.pi/extensions/harness-anchored-edit.ts`](.pi/extensions/harness-anchored-edit.ts) — first-class harness `read`/`edit` (always on when harness extensions load). harness-lens autopatches anchored `edit.text` at `tool_call`; native apply via `applyAnchoredEditsToFile`.

## pi-vcc (vendored)

- **Project:** https://github.com/sting8k/pi-vcc
- **Conceptual basis:** https://github.com/lllyasviel/VCC (View-oriented Conversation Compiler)
- **License:** MIT (see upstream repository)
- **Pinned revision:** See [vendor/pi-vcc/UPSTREAM_PIN.md](vendor/pi-vcc/UPSTREAM_PIN.md)
- ultimate-pi loads it from [`vendor/pi-vcc`](vendor/pi-vcc) via [`.pi/extensions/ultimate-pi-vcc.ts`](.pi/extensions/ultimate-pi-vcc.ts). Harness configuration is env-only: `HARNESS_VCC_COMPACTION`, `HARNESS_VCC_DEBUG` ([`.pi/lib/harness-vcc-settings.ts`](.pi/lib/harness-vcc-settings.ts)). Maintainer refresh: `npm run vendor:sync-vcc`.

## pi-subagents (vendored)

- **Project:** https://github.com/narumiruna/pi-extensions (`extensions/pi-subagents`)
- **npm:** `@narumitw/pi-subagents@0.1.26`
- **License:** MIT ([vendor/pi-subagents/LICENSE](vendor/pi-subagents/LICENSE))
- **Pinned revision:** See [vendor/pi-subagents/UPSTREAM_PIN.md](vendor/pi-subagents/UPSTREAM_PIN.md)
- ultimate-pi loads it from [`vendor/pi-subagents`](vendor/pi-subagents) via [`.pi/extensions/harness-subagents.ts`](.pi/extensions/harness-subagents.ts) with harness discovery, spawn gates, and subprocess env. Maintainer refresh: `npm run vendor:sync-subagents`.

## CocoIndex Code (CLI + skill)

- **Project:** https://github.com/cocoindex-io/cocoindex-code
- **License:** Apache-2.0
- **Install:** `uv tool install 'cocoindex-code[full]'` (see `/harness-setup` §2.4)
- ultimate-pi vendors the upstream agent skill at [`.agents/skills/ccc/`](.agents/skills/ccc/) and bootstraps indexes via [`.pi/scripts/harness-cocoindex-bootstrap.sh`](.pi/scripts/harness-cocoindex-bootstrap.sh). Replaces deprecated `@beaconbay/ck-search`.