') + ')', 'gi'); if (regex.test(text)) { found = true; var frag = document.createDocumentFragment(); var parts = text.split(regex); parts.forEach(function(part, i) { if (i % 2 === 0) { frag.appendChild(document.createTextNode(part)); } else { var span = document.createElement('span'); span.className = 'userscript-highlight'; span.textContent = part; frag.appendChild(span); } }); node.parentNode.replaceChild(frag, node); } }); } else if (node.nodeType === 1 && node.childNodes) { // element var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT']; if (!skipTags.includes(node.tagName)) { Array.from(node.childNodes).forEach(highlight); } } } highlight(document.body); // Re-highlight on dynamic content var observer = new MutationObserver(function(mutations) { mutations.forEach(function(m) { m.addedNodes.forEach(function(node) { if (node.nodeType === 1 || node.nodeType === 3) highlight(node); }); }); }); observer.observe(document.body, { childList: true, subtree: true }); })(); } } catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + ', 'i'); if (__m === '*' || __re.test(location.href)) { // Strip utm_, fbclid, gclid, etc. from all links on page (function() { var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content', 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid', 'ref', 'ref_src', 'source', 'medium', 'campaign']; function cleanUrl(url) { try { var u = new URL(url, window.location.origin); var changed = false; trackingParams.forEach(function(p) { if (u.searchParams.has(p)) { u.searchParams.delete(p); changed = true; } }); return changed ? u.toString() : url; } catch (e) { return url; } } function cleanLinks() { document.querySelectorAll('a[href]').forEach(function(a) { var clean = cleanUrl(a.href); if (clean !== a.href) a.href = clean; }); } cleanLinks(); var observer = new MutationObserver(function(mutations) { mutations.forEach(function(m) { m.addedNodes.forEach(function(node) { if (node.nodeType === 1) { if (node.tagName === 'A') cleanLinks(); node.querySelectorAll('a[href]').forEach(function(a) { var clean = cleanUrl(a.href); if (clean !== a.href) a.href = clean; }); } }); }); }); observer.observe(document.body, { childList: true, subtree: true }); })(); } } catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); } })(); (function(){ try { var __m = "youtube.com"; var __re = new RegExp('^' + "youtube\\.com" + ', 'i'); if (__m === '*' || __re.test(location.href)) { // Auto-enable theater mode on YouTube (function() { function tryTheater() { var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]'); if (btn && !btn.classList.contains('activated')) { btn.click(); } } // Try immediately tryTheater(); // Try after navigation (SPA) var lastUrl = location.href; setInterval(function() { if (location.href !== lastUrl) { lastUrl = location.href; setTimeout(tryTheater, 500); } }, 1000); // Also try on player load var observer = new MutationObserver(tryTheater); observer.observe(document.body, { childList: true, subtree: true }); })(); } } catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + ', 'i'); if (__m === '*' || __re.test(location.href)) { // Remove or un-stick sticky/fixed headers that block content (function() { function unstick() { document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) { if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') { el.style.position = 'static'; el.style.top = 'auto'; el.style.zIndex = 'auto'; } }); } unstick(); var observer = new MutationObserver(unstick); observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] }); })(); } } catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); } })(); })(); [SEP-2663] refactor!: remove 2025-11 experimental tasks by felixweinberger · Pull Request #2128 · modelcontextprotocol/typescript-sdk · GitHub
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[SEP-2663] refactor!: remove 2025-11 experimental tasks - #2128

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[SEP-2663] refactor!: remove 2025-11 experimental tasks#2128
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@felixweinbergerfelixweinberger commented May 20, 2026•
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🗺️ Milestone tracker · standalone prerequisite — unblocks the dispatch-core extraction (M5). The PR-stack table that used to live here described a superseded prototype stack (#2129–#2134); this PR now stands alone.

Removes the 2025-11 experimental tasks implementation per SEP-2663 (tasks moved to Extensions Track).

Motivation and Context

SEP-2663 removes tasks from the core protocol. This deletes TaskManager, the task interception hooks in Protocol, and experimental.tasks.* accessors.

How Has This Been Tested?

Full suite green after rebase onto current main (test:all, check:all, lint:all; e2e matrix 0 unexpected failures). Mechanical deletion; grep audit confirms no task references remain in packages/** except microtask/platformBackgroundTask (unrelated JS terms) and taskSupport in ToolExecutionSchema (removed when the schema next syncs from spec).

Breaking Changes

Yes — experimental.tasks.* removed. See docs/migration.md.

Types of changes

  • Breaking change (fix or feature that would cause existing functionality to change)

Checklist

  • I have read the MCP Documentation
  • My code follows the repository's style guidelines
  • New and existing tests pass locally
  • I have added or updated documentation as needed

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🦋 Changeset detected

Latest commit: b1ada31

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 7 packages
NameType
@modelcontextprotocol/coreMajor
@modelcontextprotocol/serverMajor
@modelcontextprotocol/clientMajor
@modelcontextprotocol/expressMajor
@modelcontextprotocol/fastifyMajor
@modelcontextprotocol/honoMajor
@modelcontextprotocol/nodeMajor

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@modelcontextprotocol/hono

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@modelcontextprotocol/node

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commit: b1ada31

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@felixweinbergerfelixweinberger added the v2-stateless 2026-06 SDK: Protocol decomposition + SEP alignment (request-first / stateless) label May 20, 2026
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@felixweinberger
[SEP-2663] refactor!: remove 2025-11 experimental tasks (impl + refer…
adb443e
…ences)
Removes the 2025-11 experimental tasks side-channel through Protocol:
TaskManager, processInbound*/processOutbound*, task interception, the
experimental.tasks.* client/server accessors, and all task-augmented
request handling.
Also extends beyond the implementation deletion to scrub remaining
references in examples, docs, and comments. The only task-related
symbol remaining in packages/*.ts is `taskSupport` in ToolExecutionSchema,
kept solely to match spec.types.ts (which still declares it); both are
removed together in the next commit (spec regen).
CHANGELOG entries are preserved (historical record). Migration docs
retain a brief removal note. `microtask`/`platformBackgroundTask` are
JS/platform terminology, not MCP tasks.
Satisfies: SEP-2663 (core-removal half; tasks are now Extensions Track).
@felixweinberger
felixweinbergerforce-pushed the fweinberger/v2-tasks-delete branch from 96f39c0 to adb443eCompareJune 2, 2026 08:04
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Comment threadpackages/core/src/shared/protocol.ts
Comment threadtest/e2e/requirements.ts Outdated
@felixweinberger
address review: remove task mappings from codemod, drop orphaned chan…
65dcf1e
…geset, complete migration removal lists, fix stale counts, drop leftover task requirement entries
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KKonstantinov
KKonstantinov previously approved these changes Jun 2, 2026
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@felixweinberger
address deletion-audit findings: scrub planning vocabulary, fix phant…
8064c37
…om spec-type entries, restore collateral cancellation test
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felixweinberger merged commit c8d7401 into mainJun 2, 2026
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[SEP-2663] refactor!: remove 2025-11 experimental tasks (#2128)
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