diff --git a/projects/business/memory/sessions.md b/projects/business/memory/sessions.md
index a7e2e38..162b0d0 100644
--- a/projects/business/memory/sessions.md
+++ b/projects/business/memory/sessions.md
@@ -10,14 +10,14 @@
   2. **Sitemap audit** — Correct namespace, all 7 pages included, proper priorities.
   3. **Security headers audit** — CSP, HSTS, X-Frame-Options, Permissions-Policy, CORS all correct.
   4. **404 page verification** — Returns proper 404 status code.
-  5. **Coverage sub-agent spawned** — Targeting keys.ts (80.95% branches) and billing.ts (86.66% branches). Sonnet 512k spawn failed instantly (13ms, same issue as session 178). Haiku sub-agent running.
+  5. **Coverage sub-agents failed** — Targeting keys.ts and billing.ts branch coverage. Sonnet 512k: unknown model error. Haiku: crashed with JSON parse error mid-output (8m23s runtime, no code committed). No coverage changes.
 - **Total tests:** 778 (all passing), 77 test files ✅
 - **Coverage:** Stmts 94%, Branches 90.61%, Functions 84.95%, Lines 94.5%
 - **Open bugs:** ZERO 🎉
 - **CI runner:** Still absent
 - **Investor test:** All 5 checks ✅
 - **Staging delta:** 94 commits ahead of production (v0.5.1)
-- **Note:** Sonnet 512k sub-agent spawning consistently fails (13ms, sessions 178-179). Haiku works. May be a model config issue.
+- **Note:** `anthropic/claude-sonnet-4-512k` is not a valid model. Haiku crashed mid-task. Coverage work deferred to next session — try with `anthropic/claude-sonnet-4` instead.
 
 ## Session 178 — 2026-03-15 11:00 UTC (Sunday Morning)
 - **Production:** v0.5.1 ✅ healthy, 2 replicas, 0 restarts, ~10d uptime (863K+ seconds)