diff --git a/scripts/runtime-provider-env-patches.ts b/scripts/runtime-provider-env-patches.ts
index a2acd80..4cb65cb 100644
--- a/scripts/runtime-provider-env-patches.ts
+++ b/scripts/runtime-provider-env-patches.ts
@@ -40,6 +40,7 @@ function inspect(runtime: string) {
     const match = new RegExp(`^${escapePattern(options)}\\.env\\[(${identifier})\\]\\?\\.trim\\(\\)(\\|\\|void 0)?$`, "u").exec(source);
     if (!match) incompatible();
     return { name: binding.id.name, key: match[1]!, init: binding.init, source,
+      original: `${options}.env[${match[1]}]?.trim()`,
       replacement: `${options}.env[${match[1]}]?.trim()||void 0` };
   });
   const builtin = bindings[0]!;
@@ -74,7 +75,7 @@ function inspect(runtime: string) {
   const inserted = runtime.slice(initial.end, initial.end + recovery.length) === recovery;
   const patched = inserted && bindings.every(binding => binding.source === binding.replacement) && bundledSource === replacement;
   if (runtime.slice(prepare.start, prepare.end).includes(fallbackName) && !patched) incompatible();
-  return { patched, bindings, initial, bundled: bundled.init, replacement, recovery };
+  return { patched, bindings, initial, bundled: bundled.init, original, replacement, recovery };
 }
 
 export function hasRuntimeBuiltinProviderEnvRecovery(runtime: string): boolean {
@@ -94,3 +95,18 @@ export function patchRuntimeBuiltinProviderEnvRecovery(runtime: string): string
   }
   return runtime;
 }
+
+/** Restore the upstream bootstrap in test fixtures, preserving all other runtime patches. */
+export function unpatchRuntimeBuiltinProviderEnvRecovery(runtime: string): string {
+  const inspected = inspect(runtime);
+  if (!inspected.patched) return runtime;
+  const edits = [
+    ...inspected.bindings.map(binding => ({ start: binding.init.start, end: binding.init.end, text: binding.original })),
+    { start: inspected.initial.end, end: inspected.initial.end + inspected.recovery.length, text: "" },
+    { start: inspected.bundled.start, end: inspected.bundled.end, text: inspected.original }
+  ];
+  for (const edit of edits.sort((first, second) => second.start - first.start)) {
+    runtime = runtime.slice(0, edit.start) + edit.text + runtime.slice(edit.end);
+  }
+  return runtime;
+}
diff --git a/src/launcher.ts b/src/launcher.ts
index 614c443..660977e 100644
--- a/src/launcher.ts
+++ b/src/launcher.ts
@@ -533,6 +533,7 @@ export async function main(args: string[]): Promise<number> {
   process.once("SIGINT", onPluginSigint);
   process.once("SIGTERM", onPluginSigterm);
   if (process.platform !== "win32") process.once("SIGHUP", onPluginSighup);
+  const builtinProviderWarnings = new Set<string>();
   let pluginCommand: number | undefined;
   try {
     pluginCommand = await runPluginCommand(args, {
@@ -541,9 +542,10 @@ export async function main(args: string[]): Promise<number> {
         params,
         onStderr: stderr => {
           for (const line of stderr.split(/\r?\n/u)) {
-            if (line.startsWith("ZCode Built-in: ignoring unavailable ZCODE_BUILTIN_PROVIDER_CONFIG_FILE ")) {
-              process.stderr.write(`${line}\n`);
-            }
+            if (!line.startsWith("ZCode Built-in: ignoring unavailable ZCODE_BUILTIN_PROVIDER_CONFIG_FILE ")
+              || builtinProviderWarnings.has(line)) continue;
+            builtinProviderWarnings.add(line);
+            process.stderr.write(`${line}\n`);
           }
         },
         signal: signal ?? pluginAbortController.signal,
diff --git a/test/runtime-provider-env-patches.test.ts b/test/runtime-provider-env-patches.test.ts
index c5cc078..575f566 100644
--- a/test/runtime-provider-env-patches.test.ts
+++ b/test/runtime-provider-env-patches.test.ts
@@ -1,5 +1,5 @@
 import { describe, expect, test } from "bun:test";
-import { hasRuntimeBuiltinProviderEnvRecovery, patchRuntimeBuiltinProviderEnvRecovery } from "../scripts/runtime-provider-env-patches.ts";
+import { hasRuntimeBuiltinProviderEnvRecovery, patchRuntimeBuiltinProviderEnvRecovery, unpatchRuntimeBuiltinProviderEnvRecovery } from "../scripts/runtime-provider-env-patches.ts";
 
 const source = [
   'var active="ZCODE_BUILTIN_PROVIDER_CONFIG_FILE",bundled="ZCODE_BUILTIN_PROVIDER_BUNDLED_CONFIG_FILE",personal="ZCODE_PERSONAL_PROVIDER_CONFIG_FILE";',
@@ -40,6 +40,16 @@ describe("built-in provider environment recovery", () => {
     expect(patchRuntimeBuiltinProviderEnvRecovery(patched)).toBe(patched);
   });
 
+  test("restores the unpatched bootstrap without removing unrelated runtime changes", () => {
+    const baseline = `${source};const unrelatedPatch=true;`;
+    const patched = patchRuntimeBuiltinProviderEnvRecovery(baseline);
+    const restored = unpatchRuntimeBuiltinProviderEnvRecovery(patched);
+    expect(restored).toBe(baseline);
+    expect(hasRuntimeBuiltinProviderEnvRecovery(restored)).toBe(false);
+    expect(unpatchRuntimeBuiltinProviderEnvRecovery(restored)).toBe(restored);
+    expect(patchRuntimeBuiltinProviderEnvRecovery(restored)).toBe(patched);
+  });
+
   test.each([undefined, "", " \t "])("discovers bundled config for an unset or blank override (%j)", async value => {
     const host = fixture();
     const env: Record<string, string> = value === undefined ? {} : { ZCODE_BUILTIN_PROVIDER_CONFIG_FILE: value };
@@ -122,5 +132,6 @@ describe("built-in provider environment recovery", () => {
     const partial = patchRuntimeBuiltinProviderEnvRecovery(source).replace("using bundled catalog", "partial recovery");
     expect(hasRuntimeBuiltinProviderEnvRecovery(partial)).toBe(false);
     expect(() => patchRuntimeBuiltinProviderEnvRecovery(partial)).toThrow("incompatible");
+    expect(() => unpatchRuntimeBuiltinProviderEnvRecovery(partial)).toThrow("incompatible");
   });
 });
diff --git a/test/runtime/builtin-provider-env.test.ts b/test/runtime/builtin-provider-env.test.ts
index 25b526e..09f050e 100644
--- a/test/runtime/builtin-provider-env.test.ts
+++ b/test/runtime/builtin-provider-env.test.ts
@@ -5,14 +5,13 @@ import { mkdir, mkdtemp, readFile, readdir, rm, symlink, writeFile } from "node:
 import { tmpdir } from "node:os";
 import { join } from "node:path";
 import { fileURLToPath } from "node:url";
-import { hasRuntimeBuiltinProviderEnvRecovery, patchRuntimeBuiltinProviderEnvRecovery } from "../../scripts/runtime-provider-env-patches.ts";
+import { hasRuntimeBuiltinProviderEnvRecovery, patchRuntimeBuiltinProviderEnvRecovery, unpatchRuntimeBuiltinProviderEnvRecovery } from "../../scripts/runtime-provider-env-patches.ts";
 import { runtimeTestEnv } from "../fixtures/runtime-env.ts";
 
 const root = fileURLToPath(new URL("../..", import.meta.url));
 const node = Bun.which("node");
 const endpoint = "http://127.0.0.1:9";
 let directory = "", packageRoot = "", builtinContent = "";
-let baselineUnpatched = false;
 
 beforeAll(async () => {
   directory = await mkdtemp(join(tmpdir(), "zcode-builtin-env-"));
@@ -25,10 +24,15 @@ beforeAll(async () => {
     }
   }
   const original = await readFile(join(root, "vendor/zcode.cjs"), "utf8");
-  baselineUnpatched = !hasRuntimeBuiltinProviderEnvRecovery(original);
+  const baseline = unpatchRuntimeBuiltinProviderEnvRecovery(original);
+  const patched = patchRuntimeBuiltinProviderEnvRecovery(original);
+  expect(hasRuntimeBuiltinProviderEnvRecovery(baseline)).toBe(false);
+  if (patchRuntimeBuiltinProviderEnvRecovery(baseline) !== patched) {
+    throw new Error("Unpatched runtime fixture did not preserve the other runtime patches.");
+  }
   builtinContent = await readFile(join(root, "vendor/provider/zcode-builtin.json"), "utf8");
-  await writeFile(join(vendor, "zcode.cjs"), patchRuntimeBuiltinProviderEnvRecovery(original));
-  await writeFile(join(vendor, "unpatched.cjs"), original);
+  await writeFile(join(vendor, "zcode.cjs"), patched);
+  await writeFile(join(vendor, "unpatched.cjs"), baseline);
   await writeFile(join(vendor, "provider/zcode-builtin.json"), builtinContent);
   await writeFile(join(packageRoot, "package.json"), JSON.stringify({ type: "module", version: "0.0.0-test" }));
   const build = await Bun.build({ entrypoints: [join(root, "bin/zcode.ts")], outdir: join(packageRoot, "bin"), target: "node", format: "esm" });
@@ -145,18 +149,52 @@ test("fails with a diagnostic when neither override nor bundled fallback is usab
   expect(result.stderr).toContain("no valid bundled fallback");
 }, 10000);
 
-test("recovers the real launcher plugin-validation path, reproducing failure when an unpatched runtime is available", async () => {
+test("reproduces an unavailable builtin override failure with the unpatched runtime", async () => {
+  const { home, env } = await homeEnv(false);
+  env.ZCODE_BUILTIN_PROVIDER_CONFIG_FILE = join(home, "stale.json");
+  const control = await run(home, env, [join(packageRoot, "vendor/unpatched.cjs"), "app-server"]);
+  expect(control.code).toBe(1);
+  expect(control.stderr).toContain("均不可用");
+}, 10000);
+
+test("recovers the real launcher plugin-validation source path with one warning", async () => {
   const { home, env } = await homeEnv(false);
   env.ZCODE_BUILTIN_PROVIDER_CONFIG_FILE = join(home, "stale.json");
-  if (baselineUnpatched) {
-    const control = await run(home, env, [join(packageRoot, "vendor/unpatched.cjs"), "app-server"]);
-    expect(control.code).toBe(1);
-    expect(control.stderr).toContain("均不可用");
-  }
   const marketplace = join(home, "marketplace.json");
   await writeFile(marketplace, JSON.stringify({ name: "builtin-env-fixture", plugins: [] }));
   const fixed = await run(home, env, [join(packageRoot, "bin/zcode.js"), "plugins", "validate", "--source", marketplace], false);
   expect(fixed.code).toBe(0);
   expect(fixed.stdout).toContain("Plugin validation completed.");
-  expect(fixed.stderr).toContain("using bundled catalog");
+  expect(fixed.stderr.match(/using bundled catalog/gu)).toHaveLength(1);
 }, 15000);
+
+test("warns once per command when plugin-coordinate validation starts multiple app-servers", async () => {
+  const { home, env } = await homeEnv(false);
+  const marketplace = join(home, "marketplace");
+  const plugin = join(marketplace, "plugin");
+  await mkdir(join(plugin, ".zcode-plugin"), { recursive: true });
+  await mkdir(join(plugin, "skills", "probe"), { recursive: true });
+  await writeFile(join(marketplace, "marketplace.json"), JSON.stringify({
+    name: "builtin-env-fixture", pluginRoot: ".",
+    plugins: [{ name: "probe", source: "./plugin", version: "1.0.0", description: "Validation fixture" }]
+  }));
+  await writeFile(join(plugin, ".zcode-plugin", "plugin.json"), JSON.stringify({
+    name: "probe", version: "1.0.0", description: "Validation fixture", skills: "skills"
+  }));
+  await writeFile(join(plugin, "skills", "probe", "SKILL.md"),
+    "---\nname: probe\ndescription: Validation fixture\n---\nValidation fixture.\n");
+  const launcher = join(packageRoot, "bin/zcode.js");
+  const added = await run(home, env, [launcher, "plugins", "marketplace", "add", marketplace, "--yes"], false);
+  expect(added.code).toBe(0);
+  expect(added.stderr).not.toContain("using bundled catalog");
+
+  env.ZCODE_BUILTIN_PROVIDER_CONFIG_FILE = join(home, "stale.json");
+  for (const json of [false, true]) {
+    const result = await run(home, env,
+      [launcher, "plugins", "validate", "probe@builtin-env-fixture", ...json ? ["--json"] : []], false);
+    expect(result.code).toBe(0);
+    if (json) expect(JSON.parse(result.stdout)).toMatchObject({ diagnostics: [] });
+    else expect(result.stdout).toContain("Plugin validation completed.");
+    expect(result.stderr.match(/using bundled catalog/gu)).toHaveLength(1);
+  }
+}, 30000);