diff --git a/packages/ui/acp-agent/README.md b/packages/ui/acp-agent/README.md
index 8730102b64..63c9d3df23 100644
--- a/packages/ui/acp-agent/README.md
+++ b/packages/ui/acp-agent/README.md
@@ -42,7 +42,7 @@ The leaf supplies the swappable backends: an LLM adapter (`llm-deepseek` for the
 - honors `DSH_SNAPSHOT=replay` by booting the sibling `cordis.snapshot.yml` (the keyless replay tree, `llm-replay` in place of `llm-deepseek`);
 - in a snapshot run, disposes the context on stdin EOF so the session log is fully flushed before exit.
 
-Run it under `node --expose-internals`: the cordis Loader resolves the config's bare plugin specifiers through its internal module loader, active only under that flag. (`demo:acp` runs under tsx, whose tsconfig `paths` map resolves them instead.)
+Run it under `node --expose-internals`, or Loader's optional `node-addon-require-builtin` fallback is required, so the cordis Loader can resolve the config's bare plugin specifiers through its internal module loader. (`demo:acp` runs under tsx, whose tsconfig `paths` map resolves them instead.)
 
 All diagnostics go to **stderr** — stdout is the protocol.
 
diff --git a/packages/ui/app-boot/README.md b/packages/ui/app-boot/README.md
index fdea712274..73b126c33e 100644
--- a/packages/ui/app-boot/README.md
+++ b/packages/ui/app-boot/README.md
@@ -12,7 +12,7 @@ Shared boot glue for the app bins ([`dsh-stdio-agent`](../stdio-agent/README.md)
 
 Two failure classes the guards handle: `loader.await()` swallows init rejections (`Promise.allSettled`) — Node still exits non-zero on the resulting unhandled rejection, and `installFailLoud` replaces the noisy dump with one labelled line and a guaranteed `exit(1)`; a failed plugin IMPORT is only logged by the Loader (the process would otherwise exit 0 on a usable config typo), leaving a fiber-less entry that `assertEntriesLoaded` turns into a `boot()` rejection.
 
-Bare plugin specifiers in a config (`@deepseek-ai/dsh-*`) resolve through the cordis Loader's internal module loader, active only under `node --expose-internals`; the bins' subprocess smokes exercise that path, while this package's unit suite drives `boot()` in-process against configs with relative specifiers.
+Bare plugin specifiers in a config (`@deepseek-ai/dsh-*`) resolve through the cordis Loader's internal module loader, using `node --expose-internals` or the optional `node-addon-require-builtin` fallback. the bins' subprocess smokes exercise that path, while this package's unit suite drives `boot()` in-process against configs with relative specifiers.
 
 ## Model Experience
 
@@ -20,6 +20,6 @@ Indirectly, through the plugin tree it loads, which determines the prompts, sche
 
 ## Known Limitations and Deferred Work
 
-- **Bare package specifiers depend on Loader internals** — production bins need `node --expose-internals`; an in-process caller without it must use resolvable relative/file specifiers or tsx path mapping.
+- **Bare package specifiers depend on Loader internals** — production bins need `node --expose-internals` or the Loader's optional native fallback; an in-process caller without either must use resolvable relative/file specifiers or tsx path mapping.
 - **Snapshot replay swapping is basename-specific** — only a config ending in `cordis.yml` or `cordis.yaml` maps to the sibling `cordis.snapshot.yml`; custom config names require caller-managed selection.
 - **Environment loading is cwd-scoped and optional** — the helper loads one `.env` file and warns on failure; it does not search parents, merge profiles, or validate required variables.
diff --git a/packages/ui/app-boot/src/index.ts b/packages/ui/app-boot/src/index.ts
index a519b3cf70..e270ead589 100644
--- a/packages/ui/app-boot/src/index.ts
+++ b/packages/ui/app-boot/src/index.ts
@@ -98,7 +98,8 @@ export function assertEntriesLoaded(ctx: Context, binName: string): void {
  * tree settles. The include uses an absolute file URL while `baseUrl` stays at
  * the config directory for its relative imports. A missing fiber rejects here;
  * a later init rejection is handled by {@link installFailLoud}. Built bins need
- * `--expose-internals` for bare plugin specifiers; relative specifiers do not.
+ * `--expose-internals` or the Loader's native fallback for bare plugin
+ * specifiers; relative specifiers do not.
  * @param binName - the diagnostic prefix for load-failure errors.
  * @param absoluteConfigPath - the config to include; must already be absolute
  * (see {@link resolveConfigPath}).
diff --git a/packages/ui/stdio-agent/README.md b/packages/ui/stdio-agent/README.md
index 8cd97f5cc7..0f4088ae07 100644
--- a/packages/ui/stdio-agent/README.md
+++ b/packages/ui/stdio-agent/README.md
@@ -38,7 +38,7 @@ Fresh stdio sessions use the process launch directory as `session.header.cwd`, s
 
 ## The bin
 
-`dsh-stdio-agent [path-to-cordis.yml]` (default `./cordis.yml`) loads a gitignored `.env` from the cwd (`DEEPSEEK_API_KEY` / `DEEPSEEK_BASE_URL`), then drives the cordis Loader against the config and awaits the whole plugin tree before returning. Run it under `node --expose-internals`: the cordis Loader resolves the config's bare plugin specifiers (`@deepseek-ai/dsh-*`, npm packages) through its internal module loader, which is only active under that flag. The `demo:echo` / `demo:repl` scripts invoke it that way.
+`dsh-stdio-agent [path-to-cordis.yml]` (default `./cordis.yml`) loads a gitignored `.env` from the cwd (`DEEPSEEK_API_KEY` / `DEEPSEEK_BASE_URL`), then drives the cordis Loader against the config and awaits the whole plugin tree before returning. Run it under `node --expose-internals`, or install the Loader's optional `node-addon-require-builtin` fallback, so the Loader can resolve the config's bare plugin specifiers (`@deepseek-ai/dsh-*`, npm packages). The `demo:echo` / `demo:repl` scripts use `--expose-internals`.
 
 ## Example leaf `cordis.yml`