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Sample

@modelcontextprotocol/sdk 1.30.0: Register and read parameterized dynamic resources with ResourceTemplate in McpServer

Verified sample for npm @modelcontextprotocol/sdk 1.30.0: Register and read parameterized dynamic resources with ResourceTemplate in McpServer. The contract…

sha256:2686f8ca34f388a6a4d0c53609e0571e2917b29b959aef8a01558e606f889507

This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured. How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people. MIT-0

Execution evidence

The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.

Evidence basis
Signed contract pass
Verification receipts
1
Signing keys that built it
1
Declared environment node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

Verification-run environments

Environment Contract Stages Run
node 22 · linux alpine/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1node:22-alpine@sha256:c610fcdfb1d5…		 2026-08-27

Case

HOW
Goal
Register and read parameterized dynamic resources with ResourceTemplate in McpServer
Packages
Symbols
  • ResourceTemplate
Environment
node 22.23.2
Created
2026-08-27T21:56:40Z

Contract

  1. ResourceTemplate encapsulates URI template pattern and exposes uriTemplate, listCallback, and completeCallback accessors
  2. McpServer.resource with ResourceTemplate registers dynamic resource templates queryable via client.listResourceTemplates()
  3. Client.readResource matches dynamic template URIs, parses named path variables, and invokes template readCallback with extracted parameters
  4. Client.readResource throws McpError with ErrorCode.InvalidParams (-32602) when requesting a URI not matching any registered static resource or ResourceTemplate
  5. Client.complete provides argument completions for ResourceTemplate variables using completeCallback handlers

Files

  • PROMPT.md
  • csx.json
  • index.js
  • package-lock.json
  • package.json
  • spec.json
  • test/contract.js

Download the source artifact (tar.gz)

Source

PROMPT.md
Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: Register and read parameterized dynamic resources with ResourceTemplate in McpServer
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40modelcontextprotocol/sdk@1.30.0
Demonstrate these symbols/APIs:
  - ResourceTemplate

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.
csx.json
{"case":{"caseId":"case:sha256:9c97b04648d5e3abfa90d11d481f501a37addab26d039746dac6b0ac35dd331b","contract":["ResourceTemplate encapsulates URI template pattern and exposes uriTemplate, listCallback, and completeCallback accessors","McpServer.resource with ResourceTemplate registers dynamic resource templates queryable via client.listResourceTemplates()","Client.readResource matches dynamic template URIs, parses named path variables, and invokes template readCallback with extracted parameters","Client.readResource throws McpError with ErrorCode.InvalidParams (-32602) when requesting a URI not matching any registered static resource or ResourceTemplate","Client.complete provides argument completions for ResourceTemplate variables using completeCallback handlers"],"goal":"Register and read parameterized dynamic resources with ResourceTemplate in McpServer","kind":"HOW","packages":["pkg:npm/%40modelcontextprotocol/sdk@1.30.0"],"schemaVersion":1,"symbols":["ResourceTemplate"]},"contractCommand":["node","test/contract.js"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"cjs","os":"linux","osVersionBucket":"24","packageManager":"npm","packageManagerVersion":"10.9.8","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/%40modelcontextprotocol/sdk@1.30.0"],"schemaVersion":1,"subject":"pkg:npm/%40modelcontextprotocol/sdk@1.30.0","symbols":["ResourceTemplate"],"verifierAdapter":"node-typescript@1"}
index.js
'use strict';

const { McpServer, ResourceTemplate } = require('@modelcontextprotocol/sdk/server/mcp.js');
const { Client } = require('@modelcontextprotocol/sdk/client/index.js');
const { InMemoryTransport } = require('@modelcontextprotocol/sdk/inMemory.js');
const { McpError, ErrorCode } = require('@modelcontextprotocol/sdk/types.js');

/**
 * Creates a ResourceTemplate instance with uri pattern and callbacks.
 *
 * @param {string} uriPattern - URI template string (e.g. 'users://{userId}/profile')
 * @param {object} [callbacks] - Optional callbacks for list and complete
 * @returns {ResourceTemplate}
 */
function createResourceTemplate(uriPattern, callbacks = {}) {
  return new ResourceTemplate(uriPattern, {
    list: callbacks.list,
    complete: callbacks.complete,
  });
}

/**
 * Sets up a linked McpServer and Client over InMemoryTransport with sample dynamic resource templates.
 *
 * @param {object} [options]
 * @returns {Promise<{ server: McpServer, client: Client, clientTransport: InMemoryTransport, serverTransport: InMemoryTransport }>}
 */
async function setupServerAndClient(options = {}) {
  const server = new McpServer(
    { name: options.serverName || 'sample-resource-server', version: '1.0.0' },
    { capabilities: options.serverCapabilities || {} }
  );

  // Register user profile dynamic resource template
  const userTemplate = new ResourceTemplate('users://{userId}/profile', {
    list: async () => ({
      resources: [
        { uri: 'users://1/profile', name: 'User 1 Profile' },
        { uri: 'users://2/profile', name: 'User 2 Profile' },
      ],
    }),
    complete: {
      userId: async (value) => ['1', '2', '3', '42'].filter((id) => id.startsWith(value)),
    },
  });

  server.resource(
    'user-profile',
    userTemplate,
    { description: 'Dynamic user profile resource', mimeType: 'application/json' },
    async (uri, { userId }) => {
      return {
        contents: [
          {
            uri: uri.href,
            mimeType: 'application/json',
            text: JSON.stringify({ userId, status: 'active', name: `User ${userId}` }),
          },
        ],
      };
    }
  );

  // Register file dynamic resource template with multi-segment variables
  const fileTemplate = new ResourceTemplate('documents://{category}/{docId}', {
    complete: {
      category: async (value) => ['reports', 'invoices', 'notes'].filter((cat) => cat.startsWith(value)),
    },
  });

  server.resource(
    'document',
    fileTemplate,
    { description: 'Categorized document resource', mimeType: 'text/plain' },
    async (uri, { category, docId }) => {
      return {
        contents: [
          {
            uri: uri.href,
            mimeType: 'text/plain',
            text: `Category: ${category}\nDocument: ${docId}\nContent: Sample document body`,
          },
        ],
      };
    }
  );

  const [clientTransport, serverTransport] = InMemoryTransport.createLinkedPair();
  const client = new Client(
    { name: options.clientName || 'sample-resource-client', version: '1.0.0' },
    { capabilities: options.clientCapabilities || {} }
  );

  await Promise.all([
    client.connect(clientTransport),
    server.connect(serverTransport),
  ]);

  return { server, client, clientTransport, serverTransport };
}

module.exports = {
  ResourceTemplate,
  McpServer,
  Client,
  InMemoryTransport,
  McpError,
  ErrorCode,
  createResourceTemplate,
  setupServerAndClient,
};
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package.json
{
  "name": "sample-mcp-resource-template",
  "version": "1.0.0",
  "description": "Register and read parameterized dynamic resources with ResourceTemplate in McpServer",
  "main": "index.js",
  "scripts": {
    "test": "node test/contract.js"
  },
  "license": "MIT-0",
  "dependencies": {
    "@modelcontextprotocol/sdk": "1.30.0"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "Register and read parameterized dynamic resources with ResourceTemplate in McpServer",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40modelcontextprotocol/sdk@1.30.0"
  ],
  "symbols": [
    "ResourceTemplate"
  ]
}
test/contract.js
'use strict';

const assert = require('assert');
const {
  ResourceTemplate,
  McpServer,
  Client,
  McpError,
  ErrorCode,
  createResourceTemplate,
  setupServerAndClient,
} = require('../index.js');

async function runContract() {
  // 1. ResourceTemplate encapsulates URI template pattern and exposes uriTemplate, listCallback, and completeCallback accessors
  const dummyList = async () => ({ resources: [] });
  const dummyComplete = { id: async (val) => [val] };
  const rt = createResourceTemplate('items://{id}/details', {
    list: dummyList,
    complete: dummyComplete,
  });

  assert.strictEqual(rt instanceof ResourceTemplate, true, 'rt must be instance of ResourceTemplate');
  assert.strictEqual(typeof rt.uriTemplate, 'object', 'rt.uriTemplate must be UriTemplate object');
  assert.strictEqual(rt.uriTemplate.template, 'items://{id}/details', 'rt.uriTemplate.template must match input');
  assert.strictEqual(rt.listCallback, dummyList, 'rt.listCallback must return list callback');
  assert.strictEqual(typeof rt.completeCallback('id'), 'function', 'rt.completeCallback("id") must return completer');
  assert.strictEqual(rt.completeCallback('nonexistent'), undefined, 'rt.completeCallback for nonexistent variable must be undefined');

  // Set up client-server pair
  const { server, client } = await setupServerAndClient();

  // 2. McpServer.resource with ResourceTemplate registers dynamic resource templates queryable via client.listResourceTemplates()
  const templateListResult = await client.listResourceTemplates();
  assert.strictEqual(Array.isArray(templateListResult.resourceTemplates), true, 'resourceTemplates must be an array');
  assert.strictEqual(templateListResult.resourceTemplates.length, 2, 'Should register 2 resource templates');

  const userProfileTemplate = templateListResult.resourceTemplates.find((t) => t.name === 'user-profile');
  assert.ok(userProfileTemplate, 'user-profile template must be present');
  assert.strictEqual(userProfileTemplate.uriTemplate, 'users://{userId}/profile', 'uriTemplate must match registered pattern');
  assert.strictEqual(userProfileTemplate.description, 'Dynamic user profile resource');
  assert.strictEqual(userProfileTemplate.mimeType, 'application/json');

  const documentTemplate = templateListResult.resourceTemplates.find((t) => t.name === 'document');
  assert.ok(documentTemplate, 'document template must be present');
  assert.strictEqual(documentTemplate.uriTemplate, 'documents://{category}/{docId}');

  // Verify listResources delegates to template list callback if provided
  const resourcesList = await client.listResources();
  assert.strictEqual(Array.isArray(resourcesList.resources), true);
  assert.strictEqual(resourcesList.resources.length, 2);
  assert.strictEqual(resourcesList.resources[0].uri, 'users://1/profile');

  // 3. Client.readResource matches dynamic template URIs, parses named path variables, and invokes template readCallback with extracted parameters
  const user1Res = await client.readResource({ uri: 'users://42/profile' });
  assert.strictEqual(Array.isArray(user1Res.contents), true);
  assert.strictEqual(user1Res.contents.length, 1);
  assert.strictEqual(user1Res.contents[0].uri, 'users://42/profile');
  assert.strictEqual(user1Res.contents[0].mimeType, 'application/json');
  const user1Data = JSON.parse(user1Res.contents[0].text);
  assert.strictEqual(user1Data.userId, '42');
  assert.strictEqual(user1Data.status, 'active');

  const docRes = await client.readResource({ uri: 'documents://reports/annual-2026' });
  assert.strictEqual(docRes.contents.length, 1);
  assert.strictEqual(docRes.contents[0].uri, 'documents://reports/annual-2026');
  assert.strictEqual(docRes.contents[0].mimeType, 'text/plain');
  assert.ok(docRes.contents[0].text.includes('Category: reports'));
  assert.ok(docRes.contents[0].text.includes('Document: annual-2026'));

  // 4. Client.readResource throws McpError with ErrorCode.InvalidParams (-32602) when requesting a URI not matching any registered static resource or ResourceTemplate
  let unhandledCaught = false;
  try {
    await client.readResource({ uri: 'invalid://scheme/path' });
  } catch (err) {
    assert.strictEqual(err instanceof McpError, true, 'Error must be instance of McpError');
    assert.strictEqual(err.code, ErrorCode.InvalidParams, 'Error code must be InvalidParams');
    assert.strictEqual(err.code, -32602, 'ErrorCode.InvalidParams must be -32602');
    assert.ok(err.message.includes('Resource invalid://scheme/path not found'));
    unhandledCaught = true;
  }
  assert.strictEqual(unhandledCaught, true, 'Unmatched URI must throw McpError');

  // 5. Client.complete provides argument completions for ResourceTemplate variables using completeCallback handlers
  const completionUser = await client.complete({
    ref: {
      type: 'ref/resource',
      uri: 'users://{userId}/profile',
    },
    argument: {
      name: 'userId',
      value: '4',
    },
  });
  assert.deepStrictEqual(completionUser.completion.values, ['42'], 'Completion should match prefix "4" to "42"');
  assert.strictEqual(completionUser.completion.hasMore, false);

  const completionDoc = await client.complete({
    ref: {
      type: 'ref/resource',
      uri: 'documents://{category}/{docId}',
    },
    argument: {
      name: 'category',
      value: 'rep',
    },
  });
  assert.deepStrictEqual(completionDoc.completion.values, ['reports'], 'Completion should match prefix "rep" to "reports"');

  await client.close();
  await server.close();

  console.log('Contract assertions passed successfully.');
}

runContract().catch((err) => {
  console.error('Contract test failed:', err);
  process.exit(1);
});

Origin Seeder

anonymous