diff --git a/deno.json b/deno.json
index 0eed3f0c4..6f9d94247 100644
--- a/deno.json
+++ b/deno.json
@@ -90,7 +90,7 @@
       "packages/vocab-runtime/src/contexts/fep-22cd.json"
     ]
   },
-  "nodeModulesDir": "auto",
+  "nodeModulesDir": "none",
   "tasks": {
     "build": {
       "command": "pnpm --recursive --filter '@fedify/*' --parallel --silent build",
diff --git a/docs/package.json b/docs/package.json
index 4b04a1e13..b27984966 100644
--- a/docs/package.json
+++ b/docs/package.json
@@ -23,12 +23,15 @@
     "@fedify/vocab": "workspace:^",
     "@fedify/vocab-runtime": "workspace:^",
     "@fedify/relay": "workspace:^",
+    "@fedify/webfinger": "workspace:^",
     "@hono/node-server": "^1.13.7",
     "@js-temporal/polyfill": "catalog:",
     "@logtape/file": "catalog:",
     "@logtape/logtape": "catalog:",
     "@nestjs/common": "catalog:",
     "@opentelemetry/api": "catalog:",
+    "@opentelemetry/context-async-hooks": "catalog:",
+    "@opentelemetry/core": "catalog:",
     "@opentelemetry/exporter-trace-otlp-proto": "catalog:",
     "@opentelemetry/sdk-node": "catalog:",
     "@opentelemetry/sdk-trace-base": "catalog:",
diff --git a/examples/fresh/deno.json b/examples/fresh/deno.json
index e36f9c41b..36138585b 100644
--- a/examples/fresh/deno.json
+++ b/examples/fresh/deno.json
@@ -1,8 +1,8 @@
 {
   "tasks": {
     "check": "deno fmt --check . && deno lint . && deno check",
-    "dev": "vite",
-    "build": "vite build",
+    "dev": "deno run -A npm:vite@^7.1.3 --configLoader native",
+    "build": "deno run -A npm:vite@^7.1.3 build --configLoader native",
     "start": "deno serve -A _fresh/server.js",
     "update": "deno run -A -r jsr:@fresh/update ."
   },
diff --git a/mise.toml b/mise.toml
index 4cf727f5e..d45b38da4 100644
--- a/mise.toml
+++ b/mise.toml
@@ -70,9 +70,19 @@ depends = [
   "check:md",
   "check-versions",
   "check:manifest:workspace-protocol",
+  "check:node-modules",
 ]
 run = "sacho check"
 
+[tasks."check:node-modules"]
+description = "Check that Deno leaves pnpm's node_modules directories alone"
+run = '''
+if ! jq -e '.nodeModulesDir == "none"' deno.json > /dev/null; then
+  echo 'Set nodeModulesDir to "none" so Deno preserves pnpm workspace links.'
+  exit 1
+fi
+'''
+
 [tasks."check:fmt"]
 description = "Check code formatting"
 run = "deno fmt --check"
@@ -159,6 +169,10 @@ done
 '''
 
 # Testing
+[tasks."test:pack"]
+description = "Check that Deno preserves pnpm links and package packing"
+run = "node scripts/test_pack.mjs"
+
 [tasks."test:deno"]
 description = "Run the test suite using Deno"
 depends = ["prepare"]
diff --git a/packages/fastify/package.json b/packages/fastify/package.json
index bb8fbcca8..b0d0d3bf8 100644
--- a/packages/fastify/package.json
+++ b/packages/fastify/package.json
@@ -51,6 +51,7 @@
     "fastify": "catalog:"
   },
   "devDependencies": {
+    "@fedify/vocab": "workspace:^",
     "@types/node": "catalog:",
     "tsdown": "catalog:",
     "typescript": "catalog:"
diff --git a/packages/sqlite/package.json b/packages/sqlite/package.json
index 89961a58b..81ed52f00 100644
--- a/packages/sqlite/package.json
+++ b/packages/sqlite/package.json
@@ -75,6 +75,7 @@
     "@fedify/fedify": "workspace:^"
   },
   "devDependencies": {
+    "@fedify/fixture": "workspace:^",
     "@fedify/testing": "workspace:^",
     "@std/async": "catalog:",
     "tsdown": "catalog:",
diff --git a/packages/testing/package.json b/packages/testing/package.json
index 642c7e23a..96a1d0452 100644
--- a/packages/testing/package.json
+++ b/packages/testing/package.json
@@ -57,6 +57,8 @@
   },
   "devDependencies": {
     "@fedify/fixture": "workspace:^",
+    "@fedify/vocab": "workspace:^",
+    "@fedify/vocab-runtime": "workspace:^",
     "@js-temporal/polyfill": "catalog:",
     "@std/assert": "catalog:",
     "@std/async": "catalog:",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index b4986aaf0..24be96f09 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -225,6 +225,9 @@ importers:
       '@fedify/vocab-runtime':
         specifier: workspace:^
         version: link:../packages/vocab-runtime
+      '@fedify/webfinger':
+        specifier: workspace:^
+        version: link:../packages/webfinger
       '@hono/node-server':
         specifier: ^1.13.7
         version: 1.14.4(hono@4.8.3)
@@ -243,6 +246,12 @@ importers:
       '@opentelemetry/api':
         specifier: 'catalog:'
         version: 1.9.0
+      '@opentelemetry/context-async-hooks':
+        specifier: 'catalog:'
+        version: 2.5.0(@opentelemetry/api@1.9.0)
+      '@opentelemetry/core':
+        specifier: 'catalog:'
+        version: 2.5.0(@opentelemetry/api@1.9.0)
       '@opentelemetry/exporter-trace-otlp-proto':
         specifier: 'catalog:'
         version: 0.211.0(@opentelemetry/api@1.9.0)
@@ -995,6 +1004,9 @@ importers:
         specifier: 'catalog:'
         version: 5.1.0
     devDependencies:
+      '@fedify/vocab':
+        specifier: workspace:^
+        version: link:../vocab
       '@types/node':
         specifier: 'catalog:'
         version: 22.19.1
@@ -1392,6 +1404,9 @@ importers:
         specifier: ^1.31.0
         version: 1.39.5
     devDependencies:
+      '@fedify/fixture':
+        specifier: workspace:^
+        version: link:../fixture
       '@fedify/testing':
         specifier: workspace:^
         version: link:../testing
@@ -1433,6 +1448,12 @@ importers:
       '@fedify/fixture':
         specifier: workspace:^
         version: link:../fixture
+      '@fedify/vocab':
+        specifier: workspace:^
+        version: link:../vocab
+      '@fedify/vocab-runtime':
+        specifier: workspace:^
+        version: link:../vocab-runtime
       '@js-temporal/polyfill':
         specifier: 'catalog:'
         version: 0.5.1
diff --git a/scripts/test_pack.mjs b/scripts/test_pack.mjs
new file mode 100644
index 000000000..c239a701f
--- /dev/null
+++ b/scripts/test_pack.mjs
@@ -0,0 +1,118 @@
+import { deepStrictEqual, strictEqual } from "node:assert/strict";
+import { execFileSync } from "node:child_process";
+import {
+  mkdirSync,
+  mkdtempSync,
+  readdirSync,
+  readFileSync,
+  readlinkSync,
+  rmSync,
+  writeFileSync,
+} from "node:fs";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
+import process from "node:process";
+import { gunzipSync } from "node:zlib";
+
+// Use the repository's setting, but never let the negative control damage its
+// installed dependencies. Run through mise; DENO_TEST_BINARY may select a
+// different installed Deno without changing the pinned toolchain.
+const config = JSON.parse(
+  readFileSync(new URL("../deno.json", import.meta.url), "utf8"),
+);
+const deno = process.env.DENO_TEST_BINARY ?? "deno";
+const root = mkdtempSync(join(tmpdir(), "fedify-pack-"));
+function write(path, data) {
+  writeFileSync(join(root, path), data);
+}
+function json(path, value) {
+  write(path, JSON.stringify(value));
+}
+function run(command, args, cwd = root) {
+  return execFileSync(command, args, { cwd, encoding: "utf8", stdio: "pipe" });
+}
+function links() {
+  return [
+    readlinkSync(join(root, "packages/adapter/node_modules/@fedify/pack-core")),
+    readlinkSync(join(root, "packages/adapter/node_modules/chalk")),
+    readdirSync(join(root, "node_modules")).sort(),
+  ];
+}
+function packedManifest(path) {
+  const tar = gunzipSync(readFileSync(path));
+  for (let offset = 0; offset < tar.length;) {
+    const name = tar.subarray(offset, offset + 100).toString().split("\0")[0];
+    const size = parseInt(
+      tar.subarray(offset + 124, offset + 136).toString().replace(/\0/g, ""),
+      8,
+    );
+    if (!name) break;
+    if (name === "package/package.json") {
+      return JSON.parse(tar.subarray(offset + 512, offset + 512 + size));
+    }
+    offset += 512 + Math.ceil(size / 512) * 512;
+  }
+  throw new Error("Packed package.json not found");
+}
+
+try {
+  mkdirSync(join(root, "packages/core"), { recursive: true });
+  mkdirSync(join(root, "packages/adapter"), { recursive: true });
+  json("package.json", { private: true });
+  write("pnpm-workspace.yaml", "packages:\n  - packages/*\n");
+  json("deno.json", {
+    nodeModulesDir: config.nodeModulesDir,
+    workspace: ["./packages/core", "./packages/adapter"],
+    imports: { chalk: "npm:chalk@5.6.2" },
+  });
+  json("packages/core/deno.json", {
+    name: "@fedify/pack-core",
+    version: "1.2.3",
+    exports: "./mod.js",
+  });
+  json("packages/core/package.json", {
+    name: "@fedify/pack-core",
+    version: "1.2.3",
+    type: "module",
+    exports: "./mod.js",
+  });
+  write("packages/core/mod.js", "export const value = 42;\n");
+  json("packages/adapter/deno.json", { exports: "./mod.js" });
+  json("packages/adapter/package.json", {
+    name: "@fedify/pack-adapter",
+    version: "1.2.3",
+    type: "module",
+    peerDependencies: { "@fedify/pack-core": "workspace:^" },
+    devDependencies: { chalk: "5.6.2" },
+    scripts: { prepack: "node prepack.js" },
+  });
+  write(
+    "packages/adapter/mod.js",
+    'import chalk from "chalk";\nimport { value } from "@fedify/pack-core";\nconsole.log(chalk.green(String(value)));\n',
+  );
+  write(
+    "packages/adapter/prepack.js",
+    'import "./mod.js";\nimport { writeFileSync } from "node:fs";\nwriteFileSync("lifecycle.txt", "prepack ran");\n',
+  );
+  run("pnpm", ["install", "--ignore-scripts", "--no-frozen-lockfile"]);
+  const before = links();
+  console.log(run(deno, ["--version"]).trim());
+  run(deno, ["check", "packages/adapter/mod.js"]);
+  deepStrictEqual(links(), before, "Deno changed pnpm's node_modules");
+  run(
+    "pnpm",
+    ["pack", "--pack-destination", root],
+    join(root, "packages/adapter"),
+  );
+  strictEqual(
+    readFileSync(join(root, "packages/adapter/lifecycle.txt"), "utf8"),
+    "prepack ran",
+  );
+  const manifest = packedManifest(join(root, "fedify-pack-adapter-1.2.3.tgz"));
+  strictEqual(manifest.peerDependencies["@fedify/pack-core"], "^1.2.3");
+  console.log(
+    "Deno preserved pnpm links and lifecycle-enabled packing passed.",
+  );
+} finally {
+  rmSync(root, { recursive: true, force: true });
+}