diff --git a/AGENTS.md b/AGENTS.md
index d090736..5a838fd 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -56,8 +56,14 @@ The live analysis effect clears auto-capture progress when its settings change.
 [PuzlWerk already exists](https://github.com/wstein/puzlwerk). Its target ownership
 is the shared ReScript cube mechanics, state model, coordinates, cubie/sticker
 identity, orientation/symmetry semantics, notation/codecs and reusable solver
-integration; its viewer boundary uses TypeScript. This does not mean a package
-is released or CubeAssembler already consumes it. See
+integration. **Shared TypeScript viewer ownership is unresolved:** [Cubistry
+#21](https://github.com/wstein/cubistry/issues/21) originally proposed a
+PuzlWerk viewer, but the current [PuzlWerk ecosystem boundary](https://github.com/wstein/puzlwerk/blob/main/README.md#ecosystem-boundary)
+excludes browser viewers, while [Cubistry #60](https://github.com/wstein/cubistry/issues/60)
+assigns the current renderer to Cubistry. Neither is an approved silent
+replacement of #21. Do not add or migrate a shared viewer until the owner
+resolves this discrepancy and separately approves M2. Repository existence
+does not mean a package is released or CubeAssembler consumes it. See
 [Cubistry #21](https://github.com/wstein/cubistry/issues/21),
 [local tracking #29](https://github.com/wstein/cube-assembler/issues/29),
 [PuzlWerk #5](https://github.com/wstein/puzlwerk/issues/5) and
@@ -79,9 +85,11 @@ Each implementation/migration phase needs explicit human approval.
 CubeAssembler remains the independent scanning/assembly application. Preserve
 its capture, color review, profiles, assembly, UI, renderer and existing
 2×2–7×7 behavior/tests until an approved replacement and migration plan exist.
-Necessary fixes remain allowed in their authorized scope. Before expanding
-reusable cube or viewer primitives, check PuzlWerk ownership and track the
-shared change rather than building a second permanent engine. Do not silently
+Necessary fixes remain allowed in their authorized scope. Before expanding reusable cube mechanics, check PuzlWerk ownership and track
+the shared change rather than building a second permanent engine. Before
+extending reusable viewer primitives, consult the unresolved viewer ownership
+gate in Cubistry #21; preserve the working app renderer and avoid a second
+permanent rendering engine. Do not silently
 move code, add unapproved dependencies or delete working functionality.
 
 Cubacle remains a separate optional Rust solver provider, not Rust code inside