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+---
+status: located
+opened: 2026-10-03
+located-in:
+  - mesh-tools
+  - mesh-controller
+fixed-by:
+amended-design:
+---
+
+# 212 — A toolchain rebuild keeps the SDK it cached, and every bundle built on it carries the old one
+
+## What was observed
+
+2026-10-03, rolling out [ADR 0193](../../02-DECISIONS/0193-every-bundle-the-runtime-serves-is-launched-and-the-runtime-knows-no-language.md).
+SDK 0.1.5 was published, then the TypeScript toolchain image was rebuilt, then node-tools and six
+bundles were rebuilt on it and pushed. On every machine the bundles carried SDK 0.1.3:
+
+```
+bundle SDK: "version": "0.1.3"
+```
+
+The launched packet filter and intrusion prevention, which register their seat first, then served
+their seat's verbs as their own tools, and `node-packet-filter.*` and `node-intrusion-prevention.*`
+stopped answering on three machines until fixed.
+
+## Why it matters beyond this instance
+
+The toolchain image installs its dependencies from a `package.json` that names the SDK by range.
+The file did not change, so the image build reused its cached install layer, and "rebuilt after
+the release" did not mean "carries the release". Every TypeScript bundle copies its dependencies
+from that image ([design 38](../../03-DESIGN/01-to-be/38-building-the-operators-machine.md) WP3),
+so an SDK release reaches no bundle until something else happens to change that file. Nothing
+reports it: the build succeeds and records the new commit.
+
+## Diagnosis
+
+Owners mesh-tools (the image's recipe) and mesh-controller (the builder that runs it). **Worked
+around** on the day by requiring `^0.1.5` in node-tools' `package.json` (mesh-tools #37), which
+changes the layer. **Fix direction:** a toolchain build must not trust a cached dependency install —
+install from a lockfile that a release updates, or build the install layer without the cache — and
+the build should record which SDK version the image carries, so a bundle's record says what it was
+compiled against. A check: after an SDK release and a toolchain rebuild, a bundle built on it reports
+the released version.