# 2026-03-25T18:11 — Procedures (Prompt Engineer, sonnet)

**Task:** Update #588 model catalog  
**Mode:** background  
**Status:** ✅ MERGED

## Outcome

Updated all 5 copies of `squad.agent.md`. Removed stale models, added new models, restructured fallback chains. Committed on `squad/588-update-model-catalog`.

## Details

**Changes:**
- Removed 2 stale models: `claude-opus-4.6-fast`, `gpt-5` (standalone)
- Added 5 new models: `claude-sonnet-4.6`, `claude-opus-4.6-1m`, `gpt-5.4`, `gpt-5.3-codex`, `gpt-5.4-mini`
- Default code model bumped to `claude-sonnet-4.6`
- Code specialist bumped to `gpt-5.3-codex`
- Fallback chains restructured with current model availability

**Templates updated:**
1. `.squad-templates/squad.agent.md`
2. `templates/squad.agent.md`
3. `.squad/templates/squad.agent.md`
4. `packages/squad-sdk/templates/squad.agent.md`
5. `packages/squad-cli/templates/squad.agent.md`

**Decision:** Model catalog is current as of March 25. Platform default for code model is `claude-sonnet-4.6`. All agents using model selection will reference current models.

---

*Logged by Scribe at 2026-03-25T18:11Z*
