[v2] move to Headers object - #1327

Merged
mattzcarey merged 6 commits into
modelcontextprotocol:mainfrom
KKonstantinov:feature/v2-server-headers-object
Jan 20, 2026
Merged

[v2] move to Headers object#1327
mattzcarey merged 6 commits into
modelcontextprotocol:mainfrom
KKonstantinov:feature/v2-server-headers-object

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@KKonstantinovKKonstantinov commented Dec 20, 2025•
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v2 project issue: #1300

Motivation and Context

v2

How Has This Been Tested?

Breaking Changes

Types of changes

  • Bug fix (non-breaking change which fixes an issue)
  • New feature (non-breaking change which adds functionality)
  • Breaking change (fix or feature that would cause existing functionality to change)
  • Documentation update

Checklist

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

Additional context

@KKonstantinov
KKonstantinov requested a review from a team as a code ownerDecember 20, 2025 12:17
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⚠️ No Changeset found

Latest commit: 751df8a

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

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@modelcontextprotocol/client

npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/client@1327

@modelcontextprotocol/server

npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/server@1327

@modelcontextprotocol/express

npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/express@1327

@modelcontextprotocol/hono

npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/hono@1327

@modelcontextprotocol/node

npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/node@1327

commit: 751df8a

@KKonstantinovKKonstantinov changed the title v2: move to Headers object[v2] move to Headers objectDec 23, 2025
@KKonstantinovKKonstantinov added the v2 Ideas, requests and plans for v2 of the SDK which will incorporate major changes and fixes label Dec 23, 2025
@mattzcarey
mattzcarey enabled auto-merge (squash) January 20, 2026 10:30
@mattzcarey
mattzcarey merged commit 40f6ba7 into modelcontextprotocol:mainJan 20, 2026
9 checks passed
@KKonstantinovKKonstantinov linked an issue Jan 21, 2026 that may be closed by this pull request
Use standard Headers API instead of custom request context object #1300
Closed
@KKonstantinovKKonstantinov self-assigned this Jan 21, 2026
mozmo15 pushed a commit to mozmo15/typescript-sdk that referenced this pull request Mar 30, 2026
@KKonstantinov@mattzcareymozmo15
[v2] move to Headers object (modelcontextprotocol#1327)
18a1490
Co-authored-by: Matt <77928207+mattzcarey@users.noreply.github.com>
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v2Ideas, requests and plans for v2 of the SDK which will incorporate major changes and fixes

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Successfully merging this pull request may close these issues.

Use standard Headers API instead of custom request context object

3 participants

@KKonstantinov@pcarleton@mattzcarey
, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

Skip to content
[v2] move to Headers object - #1327
Merged
mattzcarey merged 6 commits into
modelcontextprotocol:mainfrom 
KKonstantinov:feature/v2-server-headers-object
Jan 20, 2026
Merged
[v2] move to Headers object#1327
mattzcarey merged 6 commits into
modelcontextprotocol:mainfrom 
KKonstantinov:feature/v2-server-headers-object
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@KKonstantinov
@KKonstantinovKKonstantinov
commented
Dec 20, 2025•

edited

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Contributor
v2 project issue: #1300
Motivation and Context
v2
How Has This Been Tested?
Breaking Changes
Types of changes
  •  Bug fix (non-breaking change which fixes an issue)
  •  New feature (non-breaking change which adds functionality)
  •  Breaking change (fix or feature that would cause existing functionality to change)
  •  Documentation update
Checklist
  •  I have read the MCP Documentation
  •  My code follows the repository's style guidelines
  •  New and existing tests pass locally
  •  I have added appropriate error handling
  •  I have added or updated documentation as needed
Additional context
@KKonstantinov
KKonstantinov
requested a review
from a team
as a code ownerDecember 20, 2025 12:17
@changeset-bot
changeset-botBot
commented
Dec 20, 2025•

edited

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⚠️ No Changeset found
Latest commit: 751df8a
Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.
This PR includes no changesets
When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types
Click here to learn what changesets are, and how to add one.
Click here if you're a maintainer who wants to add a changeset to this PR
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@modelcontextprotocol/client
npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/client@1327

@modelcontextprotocol/server
npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/server@1327

@modelcontextprotocol/express
npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/express@1327

@modelcontextprotocol/hono
npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/hono@1327

@modelcontextprotocol/node
npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/node@1327

commit: 751df8a
@KKonstantinovKKonstantinov
changed the title
v2: move to Headers object[v2] move to Headers objectDec 23, 2025
@KKonstantinovKKonstantinov
added
the 
v2
Ideas, requests and plans for v2 of the SDK which will incorporate major changes and fixes
label
Dec 23, 2025
@mattzcarey
mattzcarey
enabled auto-merge (squash)
January 20, 2026 10:30
@mattzcarey
mattzcarey
merged commit 40f6ba7
into
modelcontextprotocol:mainJan 20, 2026

9 checks passed

@KKonstantinovKKonstantinov
linked an issue
Jan 21, 2026
that may be
closed
by this pull request


Use standard Headers API instead of custom request context object
#1300

Closed

@KKonstantinovKKonstantinov
self-assigned this
Jan 21, 2026
mozmo15 pushed a commit
to mozmo15/typescript-sdk
that referenced
this pull request
Mar 30, 2026
@KKonstantinov@mattzcareymozmo15
[v2] move to Headers object (modelcontextprotocol#1327)
18a1490
Co-authored-by: Matt <77928207+mattzcarey@users.noreply.github.com>
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@pcarletonpcarletonpcarleton approved these changes

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Labels

v2Ideas, requests and plans for v2 of the SDK which will incorporate major changes and fixes

Projects


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No milestone


Development

Successfully merging this pull request may close these issues.

Use standard Headers API instead of custom request context object


3 participants

@KKonstantinov@pcarleton@mattzcarey

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
[v2] move to Headers object - #1327
Merged
mattzcarey merged 6 commits into
modelcontextprotocol:mainfrom 
KKonstantinov:feature/v2-server-headers-object
Jan 20, 2026
Merged
[v2] move to Headers object#1327
mattzcarey merged 6 commits into
modelcontextprotocol:mainfrom 
KKonstantinov:feature/v2-server-headers-object
Conversation
@KKonstantinov
@KKonstantinovKKonstantinov
commented
Dec 20, 2025•

edited

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Contributor
v2 project issue: #1300
Motivation and Context
v2
How Has This Been Tested?
Breaking Changes
Types of changes
  •  Bug fix (non-breaking change which fixes an issue)
  •  New feature (non-breaking change which adds functionality)
  •  Breaking change (fix or feature that would cause existing functionality to change)
  •  Documentation update
Checklist
  •  I have read the MCP Documentation
  •  My code follows the repository's style guidelines
  •  New and existing tests pass locally
  •  I have added appropriate error handling
  •  I have added or updated documentation as needed
Additional context
@KKonstantinov
KKonstantinov
requested a review
from a team
as a code ownerDecember 20, 2025 12:17
@changeset-bot
changeset-botBot
commented
Dec 20, 2025•

edited

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⚠️ No Changeset found
Latest commit: 751df8a
Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.
This PR includes no changesets
When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types
Click here to learn what changesets are, and how to add one.
Click here if you're a maintainer who wants to add a changeset to this PR
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@modelcontextprotocol/client
npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/client@1327

@modelcontextprotocol/server
npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/server@1327

@modelcontextprotocol/express
npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/express@1327

@modelcontextprotocol/hono
npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/hono@1327

@modelcontextprotocol/node
npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/node@1327

commit: 751df8a
@KKonstantinovKKonstantinov
changed the title
v2: move to Headers object[v2] move to Headers objectDec 23, 2025
@KKonstantinovKKonstantinov
added
the 
v2
Ideas, requests and plans for v2 of the SDK which will incorporate major changes and fixes
label
Dec 23, 2025
@mattzcarey
mattzcarey
enabled auto-merge (squash)
January 20, 2026 10:30
@mattzcarey
mattzcarey
merged commit 40f6ba7
into
modelcontextprotocol:mainJan 20, 2026

9 checks passed

@KKonstantinovKKonstantinov
linked an issue
Jan 21, 2026
that may be
closed
by this pull request


Use standard Headers API instead of custom request context object
#1300

Closed

@KKonstantinovKKonstantinov
self-assigned this
Jan 21, 2026
mozmo15 pushed a commit
to mozmo15/typescript-sdk
that referenced
this pull request
Mar 30, 2026
@KKonstantinov@mattzcareymozmo15
[v2] move to Headers object (modelcontextprotocol#1327)
18a1490
Co-authored-by: Matt <77928207+mattzcarey@users.noreply.github.com>
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Reviewers

@pcarletonpcarletonpcarleton approved these changes

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@KKonstantinovKKonstantinov

Labels

v2Ideas, requests and plans for v2 of the SDK which will incorporate major changes and fixes

Projects


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Milestone


No milestone


Development

Successfully merging this pull request may close these issues.

Use standard Headers API instead of custom request context object


3 participants

@KKonstantinov@pcarleton@mattzcarey

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
[v2] move to Headers object - #1327
Merged
mattzcarey merged 6 commits into
modelcontextprotocol:mainfrom 
KKonstantinov:feature/v2-server-headers-object
Jan 20, 2026
Merged
[v2] move to Headers object#1327
mattzcarey merged 6 commits into
modelcontextprotocol:mainfrom 
KKonstantinov:feature/v2-server-headers-object
Conversation
@KKonstantinov
@KKonstantinovKKonstantinov
commented
Dec 20, 2025•

edited

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Contributor
v2 project issue: #1300
Motivation and Context
v2
How Has This Been Tested?
Breaking Changes
Types of changes
  •  Bug fix (non-breaking change which fixes an issue)
  •  New feature (non-breaking change which adds functionality)
  •  Breaking change (fix or feature that would cause existing functionality to change)
  •  Documentation update
Checklist
  •  I have read the MCP Documentation
  •  My code follows the repository's style guidelines
  •  New and existing tests pass locally
  •  I have added appropriate error handling
  •  I have added or updated documentation as needed
Additional context
@KKonstantinov
KKonstantinov
requested a review
from a team
as a code ownerDecember 20, 2025 12:17
@changeset-bot
changeset-botBot
commented
Dec 20, 2025•

edited

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⚠️ No Changeset found
Latest commit: 751df8a
Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.
This PR includes no changesets
When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types
Click here to learn what changesets are, and how to add one.
Click here if you're a maintainer who wants to add a changeset to this PR
@pkg-pr-new
pkg-pr-newBot
commented
Dec 20, 2025•

edited

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@modelcontextprotocol/client
npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/client@1327

@modelcontextprotocol/server
npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/server@1327

@modelcontextprotocol/express
npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/express@1327

@modelcontextprotocol/hono
npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/hono@1327

@modelcontextprotocol/node
npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/node@1327

commit: 751df8a
@KKonstantinovKKonstantinov
changed the title
v2: move to Headers object[v2] move to Headers objectDec 23, 2025
@KKonstantinovKKonstantinov
added
the 
v2
Ideas, requests and plans for v2 of the SDK which will incorporate major changes and fixes
label
Dec 23, 2025
@mattzcarey
mattzcarey
enabled auto-merge (squash)
January 20, 2026 10:30
@mattzcarey
mattzcarey
merged commit 40f6ba7
into
modelcontextprotocol:mainJan 20, 2026

9 checks passed

@KKonstantinovKKonstantinov
linked an issue
Jan 21, 2026
that may be
closed
by this pull request


Use standard Headers API instead of custom request context object
#1300

Closed

@KKonstantinovKKonstantinov
self-assigned this
Jan 21, 2026
mozmo15 pushed a commit
to mozmo15/typescript-sdk
that referenced
this pull request
Mar 30, 2026
@KKonstantinov@mattzcareymozmo15
[v2] move to Headers object (modelcontextprotocol#1327)
18a1490
Co-authored-by: Matt <77928207+mattzcarey@users.noreply.github.com>
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Reviewers

@pcarletonpcarletonpcarleton approved these changes

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@KKonstantinovKKonstantinov

Labels

v2Ideas, requests and plans for v2 of the SDK which will incorporate major changes and fixes

Projects


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Milestone


No milestone


Development

Successfully merging this pull request may close these issues.

Use standard Headers API instead of custom request context object


3 participants

@KKonstantinov@pcarleton@mattzcarey

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

Skip to content
[v2] move to Headers object - #1327
Merged
mattzcarey merged 6 commits into
modelcontextprotocol:mainfrom 
KKonstantinov:feature/v2-server-headers-object
Jan 20, 2026
Merged
[v2] move to Headers object#1327
mattzcarey merged 6 commits into
modelcontextprotocol:mainfrom 
KKonstantinov:feature/v2-server-headers-object
Conversation
@KKonstantinov
@KKonstantinovKKonstantinov
commented
Dec 20, 2025•

edited

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Contributor
v2 project issue: #1300
Motivation and Context
v2
How Has This Been Tested?
Breaking Changes
Types of changes
  •  Bug fix (non-breaking change which fixes an issue)
  •  New feature (non-breaking change which adds functionality)
  •  Breaking change (fix or feature that would cause existing functionality to change)
  •  Documentation update
Checklist
  •  I have read the MCP Documentation
  •  My code follows the repository's style guidelines
  •  New and existing tests pass locally
  •  I have added appropriate error handling
  •  I have added or updated documentation as needed
Additional context
@KKonstantinov
KKonstantinov
requested a review
from a team
as a code ownerDecember 20, 2025 12:17
@changeset-bot
changeset-botBot
commented
Dec 20, 2025•

edited

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⚠️ No Changeset found
Latest commit: 751df8a
Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.
This PR includes no changesets
When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types
Click here to learn what changesets are, and how to add one.
Click here if you're a maintainer who wants to add a changeset to this PR
@pkg-pr-new
pkg-pr-newBot
commented
Dec 20, 2025•

edited

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@modelcontextprotocol/client
npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/client@1327

@modelcontextprotocol/server
npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/server@1327

@modelcontextprotocol/express
npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/express@1327

@modelcontextprotocol/hono
npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/hono@1327

@modelcontextprotocol/node
npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/node@1327

commit: 751df8a
@KKonstantinovKKonstantinov
changed the title
v2: move to Headers object[v2] move to Headers objectDec 23, 2025
@KKonstantinovKKonstantinov
added
the 
v2
Ideas, requests and plans for v2 of the SDK which will incorporate major changes and fixes
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Dec 23, 2025
@mattzcarey
mattzcarey
enabled auto-merge (squash)
January 20, 2026 10:30
@mattzcarey
mattzcarey
merged commit 40f6ba7
into
modelcontextprotocol:mainJan 20, 2026

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@KKonstantinovKKonstantinov
linked an issue
Jan 21, 2026
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Use standard Headers API instead of custom request context object
#1300

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mozmo15 pushed a commit
to mozmo15/typescript-sdk
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Mar 30, 2026
@KKonstantinov@mattzcareymozmo15
[v2] move to Headers object (modelcontextprotocol#1327)
18a1490
Co-authored-by: Matt <77928207+mattzcarey@users.noreply.github.com>
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Use standard Headers API instead of custom request context object


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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
[v2] move to Headers object - #1327
Merged
mattzcarey merged 6 commits into
modelcontextprotocol:mainfrom 
KKonstantinov:feature/v2-server-headers-object
Jan 20, 2026
Merged
[v2] move to Headers object#1327
mattzcarey merged 6 commits into
modelcontextprotocol:mainfrom 
KKonstantinov:feature/v2-server-headers-object
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@KKonstantinov
@KKonstantinovKKonstantinov
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Dec 20, 2025•

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Contributor
v2 project issue: #1300
Motivation and Context
v2
How Has This Been Tested?
Breaking Changes
Types of changes
  •  Bug fix (non-breaking change which fixes an issue)
  •  New feature (non-breaking change which adds functionality)
  •  Breaking change (fix or feature that would cause existing functionality to change)
  •  Documentation update
Checklist
  •  I have read the MCP Documentation
  •  My code follows the repository's style guidelines
  •  New and existing tests pass locally
  •  I have added appropriate error handling
  •  I have added or updated documentation as needed
Additional context
@KKonstantinov
KKonstantinov
requested a review
from a team
as a code ownerDecember 20, 2025 12:17
@changeset-bot
changeset-botBot
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Dec 20, 2025•

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⚠️ No Changeset found
Latest commit: 751df8a
Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.
This PR includes no changesets
When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types
Click here to learn what changesets are, and how to add one.
Click here if you're a maintainer who wants to add a changeset to this PR
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@modelcontextprotocol/client
npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/client@1327

@modelcontextprotocol/server
npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/server@1327

@modelcontextprotocol/express
npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/express@1327

@modelcontextprotocol/hono
npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/hono@1327

@modelcontextprotocol/node
npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/node@1327

commit: 751df8a
@KKonstantinovKKonstantinov
changed the title
v2: move to Headers object[v2] move to Headers objectDec 23, 2025
@KKonstantinovKKonstantinov
added
the 
v2
Ideas, requests and plans for v2 of the SDK which will incorporate major changes and fixes
label
Dec 23, 2025
@mattzcarey
mattzcarey
enabled auto-merge (squash)
January 20, 2026 10:30
@mattzcarey
mattzcarey
merged commit 40f6ba7
into
modelcontextprotocol:mainJan 20, 2026

9 checks passed

@KKonstantinovKKonstantinov
linked an issue
Jan 21, 2026
that may be
closed
by this pull request


Use standard Headers API instead of custom request context object
#1300

Closed

@KKonstantinovKKonstantinov
self-assigned this
Jan 21, 2026
mozmo15 pushed a commit
to mozmo15/typescript-sdk
that referenced
this pull request
Mar 30, 2026
@KKonstantinov@mattzcareymozmo15
[v2] move to Headers object (modelcontextprotocol#1327)
18a1490
Co-authored-by: Matt <77928207+mattzcarey@users.noreply.github.com>
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v2Ideas, requests and plans for v2 of the SDK which will incorporate major changes and fixes

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Development

Successfully merging this pull request may close these issues.

Use standard Headers API instead of custom request context object


3 participants

@KKonstantinov@pcarleton@mattzcarey

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
[v2] move to Headers object - #1327
Merged
mattzcarey merged 6 commits into
modelcontextprotocol:mainfrom 
KKonstantinov:feature/v2-server-headers-object
Jan 20, 2026
Merged
[v2] move to Headers object#1327
mattzcarey merged 6 commits into
modelcontextprotocol:mainfrom 
KKonstantinov:feature/v2-server-headers-object
Conversation
@KKonstantinov
@KKonstantinovKKonstantinov
commented
Dec 20, 2025•

edited

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Contributor
v2 project issue: #1300
Motivation and Context
v2
How Has This Been Tested?
Breaking Changes
Types of changes
  •  Bug fix (non-breaking change which fixes an issue)
  •  New feature (non-breaking change which adds functionality)
  •  Breaking change (fix or feature that would cause existing functionality to change)
  •  Documentation update
Checklist
  •  I have read the MCP Documentation
  •  My code follows the repository's style guidelines
  •  New and existing tests pass locally
  •  I have added appropriate error handling
  •  I have added or updated documentation as needed
Additional context
@KKonstantinov
KKonstantinov
requested a review
from a team
as a code ownerDecember 20, 2025 12:17
@changeset-bot
changeset-botBot
commented
Dec 20, 2025•

edited

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⚠️ No Changeset found
Latest commit: 751df8a
Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.
This PR includes no changesets
When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types
Click here to learn what changesets are, and how to add one.
Click here if you're a maintainer who wants to add a changeset to this PR
@pkg-pr-new
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commented
Dec 20, 2025•

edited

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@modelcontextprotocol/client
npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/client@1327

@modelcontextprotocol/server
npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/server@1327

@modelcontextprotocol/express
npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/express@1327

@modelcontextprotocol/hono
npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/hono@1327

@modelcontextprotocol/node
npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/node@1327

commit: 751df8a
@KKonstantinovKKonstantinov
changed the title
v2: move to Headers object[v2] move to Headers objectDec 23, 2025
@KKonstantinovKKonstantinov
added
the 
v2
Ideas, requests and plans for v2 of the SDK which will incorporate major changes and fixes
label
Dec 23, 2025
@mattzcarey
mattzcarey
enabled auto-merge (squash)
January 20, 2026 10:30
@mattzcarey
mattzcarey
merged commit 40f6ba7
into
modelcontextprotocol:mainJan 20, 2026

9 checks passed

@KKonstantinovKKonstantinov
linked an issue
Jan 21, 2026
that may be
closed
by this pull request


Use standard Headers API instead of custom request context object
#1300

Closed

@KKonstantinovKKonstantinov
self-assigned this
Jan 21, 2026
mozmo15 pushed a commit
to mozmo15/typescript-sdk
that referenced
this pull request
Mar 30, 2026
@KKonstantinov@mattzcareymozmo15
[v2] move to Headers object (modelcontextprotocol#1327)
18a1490
Co-authored-by: Matt <77928207+mattzcarey@users.noreply.github.com>
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Reviewers

@pcarletonpcarletonpcarleton approved these changes

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@KKonstantinovKKonstantinov

Labels

v2Ideas, requests and plans for v2 of the SDK which will incorporate major changes and fixes

Projects


None yet


Milestone


No milestone


Development

Successfully merging this pull request may close these issues.

Use standard Headers API instead of custom request context object


3 participants

@KKonstantinov@pcarleton@mattzcarey

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

Skip to content
[v2] move to Headers object - #1327
Merged
mattzcarey merged 6 commits into
modelcontextprotocol:mainfrom 
KKonstantinov:feature/v2-server-headers-object
Jan 20, 2026
Merged
[v2] move to Headers object#1327
mattzcarey merged 6 commits into
modelcontextprotocol:mainfrom 
KKonstantinov:feature/v2-server-headers-object
Conversation
@KKonstantinov
@KKonstantinovKKonstantinov
commented
Dec 20, 2025•

edited

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Contributor
v2 project issue: #1300
Motivation and Context
v2
How Has This Been Tested?
Breaking Changes
Types of changes
  •  Bug fix (non-breaking change which fixes an issue)
  •  New feature (non-breaking change which adds functionality)
  •  Breaking change (fix or feature that would cause existing functionality to change)
  •  Documentation update
Checklist
  •  I have read the MCP Documentation
  •  My code follows the repository's style guidelines
  •  New and existing tests pass locally
  •  I have added appropriate error handling
  •  I have added or updated documentation as needed
Additional context
@KKonstantinov
KKonstantinov
requested a review
from a team
as a code ownerDecember 20, 2025 12:17
@changeset-bot
changeset-botBot
commented
Dec 20, 2025•

edited

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⚠️ No Changeset found
Latest commit: 751df8a
Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.
This PR includes no changesets
When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types
Click here to learn what changesets are, and how to add one.
Click here if you're a maintainer who wants to add a changeset to this PR
@pkg-pr-new
pkg-pr-newBot
commented
Dec 20, 2025•

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Open in StackBlitz
@modelcontextprotocol/client
npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/client@1327

@modelcontextprotocol/server
npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/server@1327

@modelcontextprotocol/express
npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/express@1327

@modelcontextprotocol/hono
npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/hono@1327

@modelcontextprotocol/node
npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/node@1327

commit: 751df8a
@KKonstantinovKKonstantinov
changed the title
v2: move to Headers object[v2] move to Headers objectDec 23, 2025
@KKonstantinovKKonstantinov
added
the 
v2
Ideas, requests and plans for v2 of the SDK which will incorporate major changes and fixes
label
Dec 23, 2025
@mattzcarey
mattzcarey
enabled auto-merge (squash)
January 20, 2026 10:30
@mattzcarey
mattzcarey
merged commit 40f6ba7
into
modelcontextprotocol:mainJan 20, 2026

9 checks passed

@KKonstantinovKKonstantinov
linked an issue
Jan 21, 2026
that may be
closed
by this pull request


Use standard Headers API instead of custom request context object
#1300

Closed

@KKonstantinovKKonstantinov
self-assigned this
Jan 21, 2026
mozmo15 pushed a commit
to mozmo15/typescript-sdk
that referenced
this pull request
Mar 30, 2026
@KKonstantinov@mattzcareymozmo15
[v2] move to Headers object (modelcontextprotocol#1327)
18a1490
Co-authored-by: Matt <77928207+mattzcarey@users.noreply.github.com>
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Reviewers

@pcarletonpcarletonpcarleton approved these changes

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@KKonstantinovKKonstantinov

Labels

v2Ideas, requests and plans for v2 of the SDK which will incorporate major changes and fixes

Projects


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No milestone


Development

Successfully merging this pull request may close these issues.

Use standard Headers API instead of custom request context object


3 participants

@KKonstantinov@pcarleton@mattzcarey