diff --git a/packages/axi-sdk-js/src/hooks.ts b/packages/axi-sdk-js/src/hooks.ts
index 6b554dc..9a2a706 100644
--- a/packages/axi-sdk-js/src/hooks.ts
+++ b/packages/axi-sdk-js/src/hooks.ts
@@ -353,6 +353,31 @@ function installOpenCodeAmbientPlugin(
   }
 }
 
+// Node version managers add their active bin directory to PATH from
+// interactive shell startup files (~/.zshrc, ~/.bashrc, fnm/asdf hooks).
+// Agent SessionStart hooks, however, run under a NON-interactive shell
+// (Claude Code spawns `/bin/sh -c "<command>"`) that never sources those
+// files. A bare binary name that resolves via one of these directories at
+// install time therefore becomes "command not found" when the hook later
+// fires. Detect such directories so the caller falls back to the absolute
+// exec path, which does not depend on PATH.
+const VERSION_MANAGER_PATH_SEGMENTS = new Set([
+  ".nvm", // nvm
+  ".nvs", // nvs
+  ".fnm", // fnm (install / some layouts)
+  "fnm_multishells", // fnm (per-shell PATH entry — the common case)
+  ".asdf", // asdf
+  ".volta", // Volta
+  ".nodenv", // nodenv
+]);
+
+export function isVersionManagerPathEntry(dir: string): boolean {
+  return dir
+    .replaceAll("\\", "/")
+    .split("/")
+    .some((segment) => VERSION_MANAGER_PATH_SEGMENTS.has(segment));
+}
+
 export function resolvePortableHookCommand(
   execPath: string,
   binaryNames: string[],
@@ -374,6 +399,9 @@ export function resolvePortableHookCommand(
     }
     for (const dir of context.pathEntries) {
       if (!dir) continue;
+      // Skip version-manager bin dirs: the bare name resolves here now but
+      // won't be on PATH when the hook runs in a non-interactive shell.
+      if (isVersionManagerPathEntry(dir)) continue;
       for (const ext of context.pathExtensions) {
         const candidate = join(dir, `${name}${ext}`);
         const resolvedCandidate = context.resolveRealPath(candidate);
diff --git a/packages/axi-sdk-js/test/hooks.test.ts b/packages/axi-sdk-js/test/hooks.test.ts
index fd21238..0092776 100644
--- a/packages/axi-sdk-js/test/hooks.test.ts
+++ b/packages/axi-sdk-js/test/hooks.test.ts
@@ -18,6 +18,7 @@ import {
   computeSessionStartHookUpdate,
   extractNpmShimScriptPath,
   installSessionStartHooks,
+  isVersionManagerPathEntry,
   resolvePortableHookCommand,
   shouldInstallHooksForNodeAxiExecPath,
 } from "../src/hooks.js";
@@ -337,6 +338,76 @@ describe("resolvePortableHookCommand", () => {
       resolvePortableHookCommand(exec, ["gh-axi"], "gh-axi", context),
     ).toBe(exec);
   });
+
+  it("returns the absolute exec path when the binary only resolves via nvm", () => {
+    // Reproduces the reported bug: `gh-axi setup hooks` run from an
+    // interactive shell where nvm has put its bin dir on PATH. The bare name
+    // resolves now, but the hook later runs under `/bin/sh` without nvm.
+    const exec = "/home/me/.nvm/versions/node/v20.11.1/bin/gh-axi";
+    const context = {
+      pathEntries: ["/home/me/.nvm/versions/node/v20.11.1/bin"],
+      pathExtensions: [""],
+      resolveRealPath: (p: string) =>
+        ({
+          [exec]: exec,
+          "/home/me/.nvm/versions/node/v20.11.1/bin/gh-axi": exec,
+        })[p],
+    };
+
+    expect(
+      resolvePortableHookCommand(exec, ["gh-axi"], "gh-axi", context),
+    ).toBe(exec);
+  });
+
+  it("prefers a stable PATH dir over a version-manager dir for the same binary", () => {
+    const exec = "/usr/local/lib/node_modules/gh-axi/dist/bin/gh-axi.js";
+    const context = {
+      // nvm dir comes first but must be skipped in favor of /usr/local/bin.
+      pathEntries: [
+        "/home/me/.nvm/versions/node/v20.11.1/bin",
+        "/usr/local/bin",
+      ],
+      pathExtensions: [""],
+      resolveRealPath: (p: string) =>
+        ({
+          [exec]: exec,
+          "/home/me/.nvm/versions/node/v20.11.1/bin/gh-axi": exec,
+          "/usr/local/bin/gh-axi": exec,
+        })[p],
+    };
+
+    expect(
+      resolvePortableHookCommand(exec, ["gh-axi"], "gh-axi", context),
+    ).toBe("gh-axi");
+  });
+});
+
+describe("isVersionManagerPathEntry", () => {
+  it("flags version-manager bin directories", () => {
+    for (const dir of [
+      "/home/me/.nvm/versions/node/v20.11.1/bin",
+      "/home/me/.nvs/node/20.11.1/x64/bin",
+      "/home/me/.fnm/node-versions/v20.11.1/installation/bin",
+      "/home/me/Library/Application Support/fnm_multishells/1234_567/bin",
+      "/home/me/.asdf/shims",
+      "/home/me/.volta/bin",
+      "/home/me/.nodenv/shims",
+    ]) {
+      expect(isVersionManagerPathEntry(dir)).toBe(true);
+    }
+  });
+
+  it("does not flag stable system directories", () => {
+    for (const dir of [
+      "/usr/local/bin",
+      "/opt/homebrew/bin",
+      "/usr/bin",
+      "/home/me/.local/bin",
+      "C:\\Program Files\\nodejs",
+    ]) {
+      expect(isVersionManagerPathEntry(dir)).toBe(false);
+    }
+  });
 });
 
 describe("extractNpmShimScriptPath", () => {