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@@ -353,25 +353,6 @@ re-evaluate if isolation or write-volume demands it.
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- **Docs as projections:** `docs/TASKS.md` and `MISSION-MANIFEST.md` become generated exports of the DB, not hand-maintained.
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- **Sub-decision pending:** dedicated schema in existing PG instance (recommended) vs. dedicated PG instance. Revisit if isolation or write-volume demands it.
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## Decisions of record (2026-06-24, with Jason)
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- **Per-agent model switch (operator-configurable, NOT a global lock):** model selection is
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**per-agent**, never a host-global pin. Claude sessions MUST NOT be locked to a single model in
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`~/.claude/settings.json`; each agent chooses its model independently. The plumbing already exists —
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roster `model_hint` → `MOSAIC_AGENT_MODEL` → `start-agent-session.sh` appends `--model <hint>` to that
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agent's harness (claude or pi); settable today via `mosaic fleet add|edit <agent> --model <hint>`.
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**North-star target:** surface this as a **per-agent model switch in the webUI** (with CLI/TUI parity
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per MVP-X1) — read the roster, expose a per-agent model dropdown, write `model_hint` back, and restart
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that one agent to apply. Unset = inherit the harness default. This **composes with** the budget
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downgrade ladder (opus → sonnet → haiku, then Claude → Codex): the operator sets the per-agent model
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_intent/ceiling_; budget pacing may downgrade within policy. Tracked as a Fleet `TASKS.md` entry under
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the Phase-5 webUI surface.
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- **Orchestrator runtime (confirmed live):** the **orchestrator and enhancer run Claude Opus 4.8 in the
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Claude Code harness**; only workers (coder/reviewer) run pi/gpt-5.5. Consistent with the 2026-06-20
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"Claude reserved for Claude Code only" decision (the orchestrator runs _in_ Claude Code, not an
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alternate Claude harness). Pi/gpt-5.5 as the orchestrator is permitted **only if proven** at least as
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satisfactory; absent that proof, the orchestrator stays on Claude Opus 4.8.
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## Future enhancements (north-star, post-MVP — not on the MVP track)
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- **Mosaic Claude Discord Plugin** — a first-party Mosaic Discord connector that properly
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