diff --git a/plans/agent-briefings/primitives-loop.md b/plans/agent-briefings/primitives-loop.md
index 443c14c5..680c5099 100644
--- a/plans/agent-briefings/primitives-loop.md
+++ b/plans/agent-briefings/primitives-loop.md
@@ -668,15 +668,9 @@ Start with blank slates (CL, APL, Ruby, Tcl) — they haven't committed to worka
 **Scope per language:** only `lib/<lang>/**`. Don't touch spec or other languages.
 Brief each language's loop agent (or do inline) after rebasing their branch onto architecture.
 
-- [ ] Restart CL/APL/Ruby/Tcl loops with updated briefing pointing to new primitives.
-      Add a note to each `plans/<lang>-on-sx.md` under a `## SX primitive baseline` section:
-      "Use vectors for arrays; numeric tower + rationals for numbers; ADTs for tagged data;
-      coroutines for fibers; string-buffer for mutable string building; bitwise ops for bit
-      manipulation; multiple values for multi-return; promises for lazy evaluation; hash tables
-      for mutable associative storage; sets for O(1) membership; sequence protocol for
-      polymorphic iteration; gensym for unique symbols; char type for characters; string ports
-      + read/write for reader protocols; regexp for pattern matching; bytevectors for binary
-      data; format for string templating."
+- [x] Restart CL/APL/Ruby/Tcl loops with updated briefing pointing to new primitives.
+      Added `## SX primitive baseline` section to plans/common-lisp-on-sx.md,
+      plans/apl-on-sx.md, plans/ruby-on-sx.md, plans/tcl-on-sx.md. f43659ce.
 
 - [ ] Common Lisp: char type (`#\a`); string ports + `read`/`write` for reader/printer;
       gensym for macros; rational numbers for CL ratios; multiple values; sets for CL set ops;
@@ -726,6 +720,7 @@ Brief each language's loop agent (or do inline) after rebasing their branch onto
 
 _Newest first._
 
+- 2026-05-01: Phase 22 step 1 — SX primitive baseline added to CL/APL/Ruby/Tcl plans. f43659ce.
 - 2026-05-01: Phase 21 complete — format (~a ~s ~d ~x ~o ~b ~f ~% ~& ~~ ~t) as pure SX in spec/stdlib.sx. Fixed lib/r7rs.sx number->string to support optional radix; added format-decimal OCaml primitive. 28/28 tests on both JS and OCaml. 4d7b3e29.
 - 2026-04-26: Phase 7 complete — bitwise-and/or/xor/not + arithmetic-shift + bit-count + integer-length. OCaml: land/lor/lxor/lnot/lsl/asr + Kernighan popcount + lsr loop for integer-length. JS: bitwise ops + Hamming weight + Math.clz32. 26 tests, 158 assertions, all pass. a8a79dc9.
 - 2026-04-26: Phase 6 complete — JS+Tests+Commit all ticked. JS needed no changes (spec-level forms). 40/40 ADT tests pass JS. 2032/2500 JS total (+67 vs phase-4). Phase 6 fully landed: 6c872107+0dc7e159+5d1913e7. Phase 7 (bitwise) next.