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[v2] Мonorepo, sdk-client, sdk-server, sdk-core package split - #1279

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KKonstantinov:feature/v2-monorepo-setup
Dec 19, 2025
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[v2] Мonorepo, sdk-client, sdk-server, sdk-core package split#1279
felixweinberger merged 61 commits into
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KKonstantinov:feature/v2-monorepo-setup

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@KKonstantinovKKonstantinov commented Dec 10, 2025•
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Proof of Concept: v2 monorepo, package split

Motivation and Context

v1 of the sdk shipped both client and server in the same package, introducing extra dependencies to users who have a single concern (client or server only). Client and server packages are now split, depending on a shared core package.

Additionally, v1 exported all files as the public API of the SDK, limiting the SDK ability to iterate internally while keeping backwards compatibility. Barrel files are now introduced as the single entrypoint to the SDK and defining the public API of the SDK.

  • Dropped Node v18
  • Dropped CommonJS (ESM only)
  • Updated tsgo to one of the latest versions
  • Bumped the ts version
  • Added eslint import rules to tidy up imports
  • cleaned-up package.json files - client-sdk and server-sdk ship with the minimum required dependencies (as opposed to v1, which shipped server deps if you were only interested in the client and vice versa
  • introduce catalogs for reusing dep versions
  • bundling tool change - tsdown
  • updated docs

How Has This Been Tested?

Unit, integration tests

Breaking Changes

v2

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

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npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/client@1279

npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/server@1279

commit: c3b1a40

@KKonstantinovKKonstantinov added the v2 Ideas, requests and plans for v2 of the SDK which will incorporate major changes and fixes label Dec 10, 2025
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Is there a way we can break this PR up somehow so that this is more reviewable? E.g. with using git mv to preserve history and provenance of files? As it is it'll be quite hard to verify correctness of the split.

@KKonstantinov

KKonstantinov commented Dec 12, 2025•
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EDITs:

  • Provenance / history retained (except 3-4 files, will review them and bring it to them as well)
  • Dropped Node v18
  • Dropped CommonJS (ESM only)
  • Updated tsgo to one of the latest versions
  • Bumped the ts version
  • Added eslint import rules to tidy up imports
  • cleaned-up package.json files - client-sdk and server-sdk ship with the minimum required dependencies (as opposed to v1, which shipped server deps if you were only interested in the client and vice versa
  • introduce catalogs for reusing dep versions
  • bundling tool change - tsdown as per @mattzcarey
  • updated docs

TODOs still:

  • test(18) check - no code change, repository config -> needs to be removed as required check from branch rulesets, and replaced with test(20)

@KKonstantinovKKonstantinov added this to the v2 milestone Dec 12, 2025
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@KKonstantinovmozmo15
[v2] Мonorepo,sdk-client,sdk-server,sdk-corepackage split (m…
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…odelcontextprotocol#1279)
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[v2] Мonorepo, `sdk-client`, `sdk-server`, `sdk-core` package split by KKonstantinov · Pull Request #1279 · modelcontextprotocol/typescript-sdk · GitHub
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[v2] Мonorepo, sdk-client, sdk-server, sdk-core package split - #1279
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felixweinberger merged 61 commits into
modelcontextprotocol:mainfrom 
KKonstantinov:feature/v2-monorepo-setup
Dec 19, 2025
Merged
[v2] Мonorepo, sdk-client, sdk-server, sdk-core package split#1279
felixweinberger merged 61 commits into
modelcontextprotocol:mainfrom 
KKonstantinov:feature/v2-monorepo-setup
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Proof of Concept: v2 monorepo, package split
Motivation and Context
v1 of the sdk shipped both client and server in the same package, introducing extra dependencies to users who have a single concern (client or server only). Client and server packages are now split, depending on a shared core package.
Additionally, v1 exported all files as the public API of the SDK, limiting the SDK ability to iterate internally while keeping backwards compatibility. Barrel files are now introduced as the single entrypoint to the SDK and defining the public API of the SDK.
  • Dropped Node v18
  • Dropped CommonJS (ESM only)
  • Updated tsgo to one of the latest versions
  • Bumped the ts version
  • Added eslint import rules to tidy up imports
  • cleaned-up package.json files - client-sdk and server-sdk ship with the minimum required dependencies (as opposed to v1, which shipped server deps if you were only interested in the client and vice versa
  • introduce catalogs for reusing dep versions
  • bundling tool change - tsdown
  • updated docs
How Has This Been Tested?
Unit, integration tests
Breaking Changes
v2
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
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npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/client@1279

npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/server@1279

commit: c3b1a40
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Is there a way we can break this PR up somehow so that this is more reviewable? E.g. with using git mv to preserve history and provenance of files? As it is it'll be quite hard to verify correctness of the split.
@KKonstantinov
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EDITs:
  • Provenance / history retained (except 3-4 files, will review them and bring it to them as well)
  • Dropped Node v18
  • Dropped CommonJS (ESM only)
  • Updated tsgo to one of the latest versions
  • Bumped the ts version
  • Added eslint import rules to tidy up imports
  • cleaned-up package.json files - client-sdk and server-sdk ship with the minimum required dependencies (as opposed to v1, which shipped server deps if you were only interested in the client and vice versa
  • introduce catalogs for reusing dep versions
  • bundling tool change - tsdown as per @mattzcarey
  • updated docs
TODOs still:
  • test(18) check - no code change, repository config -> needs to be removed as required check from branch rulesets, and replaced with test(20)
@KKonstantinovKKonstantinov
added this to the v2 milestone
Dec 12, 2025
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linked an issue
Dec 12, 2025
that may be
closed
by this pull request


SDK V2
#809

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[v2] Мonorepo,sdk-client,sdk-server,sdk-corepackage split (m…
8ae33e3
…odelcontextprotocol#1279)
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v2Ideas, requests and plans for v2 of the SDK which will incorporate major changes and fixes

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Publish separate client and server packages

SDK V2


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[v2] Мonorepo, `sdk-client`, `sdk-server`, `sdk-core` package split by KKonstantinov · Pull Request #1279 · modelcontextprotocol/typescript-sdk · GitHub
Skip to content
[v2] Мonorepo, sdk-client, sdk-server, sdk-core package split - #1279
Merged
felixweinberger merged 61 commits into
modelcontextprotocol:mainfrom 
KKonstantinov:feature/v2-monorepo-setup
Dec 19, 2025
Merged
[v2] Мonorepo, sdk-client, sdk-server, sdk-core package split#1279
felixweinberger merged 61 commits into
modelcontextprotocol:mainfrom 
KKonstantinov:feature/v2-monorepo-setup
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Proof of Concept: v2 monorepo, package split
Motivation and Context
v1 of the sdk shipped both client and server in the same package, introducing extra dependencies to users who have a single concern (client or server only). Client and server packages are now split, depending on a shared core package.
Additionally, v1 exported all files as the public API of the SDK, limiting the SDK ability to iterate internally while keeping backwards compatibility. Barrel files are now introduced as the single entrypoint to the SDK and defining the public API of the SDK.
  • Dropped Node v18
  • Dropped CommonJS (ESM only)
  • Updated tsgo to one of the latest versions
  • Bumped the ts version
  • Added eslint import rules to tidy up imports
  • cleaned-up package.json files - client-sdk and server-sdk ship with the minimum required dependencies (as opposed to v1, which shipped server deps if you were only interested in the client and vice versa
  • introduce catalogs for reusing dep versions
  • bundling tool change - tsdown
  • updated docs
How Has This Been Tested?
Unit, integration tests
Breaking Changes
v2
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
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npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/client@1279

npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/server@1279

commit: c3b1a40
@KKonstantinovKKonstantinov
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v2
Ideas, requests and plans for v2 of the SDK which will incorporate major changes and fixes
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Is there a way we can break this PR up somehow so that this is more reviewable? E.g. with using git mv to preserve history and provenance of files? As it is it'll be quite hard to verify correctness of the split.
@KKonstantinov
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Dec 12, 2025•

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EDITs:
  • Provenance / history retained (except 3-4 files, will review them and bring it to them as well)
  • Dropped Node v18
  • Dropped CommonJS (ESM only)
  • Updated tsgo to one of the latest versions
  • Bumped the ts version
  • Added eslint import rules to tidy up imports
  • cleaned-up package.json files - client-sdk and server-sdk ship with the minimum required dependencies (as opposed to v1, which shipped server deps if you were only interested in the client and vice versa
  • introduce catalogs for reusing dep versions
  • bundling tool change - tsdown as per @mattzcarey
  • updated docs
TODOs still:
  • test(18) check - no code change, repository config -> needs to be removed as required check from branch rulesets, and replaced with test(20)
@KKonstantinovKKonstantinov
added this to the v2 milestone
Dec 12, 2025
@KKonstantinovKKonstantinov
linked an issue
Dec 12, 2025
that may be
closed
by this pull request


SDK V2
#809

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23 tasks

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mozmo15 pushed a commit
to mozmo15/typescript-sdk
that referenced
this pull request
Mar 30, 2026
@KKonstantinovmozmo15
[v2] Мonorepo,sdk-client,sdk-server,sdk-corepackage split (m…
8ae33e3
…odelcontextprotocol#1279)
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Development

Successfully merging this pull request may close these issues.

ESM only (if feasible)

Publish separate client and server packages

SDK V2


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[v2] Мonorepo, `sdk-client`, `sdk-server`, `sdk-core` package split by KKonstantinov · Pull Request #1279 · modelcontextprotocol/typescript-sdk · GitHub
Skip to content
[v2] Мonorepo, sdk-client, sdk-server, sdk-core package split - #1279
Merged
felixweinberger merged 61 commits into
modelcontextprotocol:mainfrom 
KKonstantinov:feature/v2-monorepo-setup
Dec 19, 2025
Merged
[v2] Мonorepo, sdk-client, sdk-server, sdk-core package split#1279
felixweinberger merged 61 commits into
modelcontextprotocol:mainfrom 
KKonstantinov:feature/v2-monorepo-setup
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Proof of Concept: v2 monorepo, package split
Motivation and Context
v1 of the sdk shipped both client and server in the same package, introducing extra dependencies to users who have a single concern (client or server only). Client and server packages are now split, depending on a shared core package.
Additionally, v1 exported all files as the public API of the SDK, limiting the SDK ability to iterate internally while keeping backwards compatibility. Barrel files are now introduced as the single entrypoint to the SDK and defining the public API of the SDK.
  • Dropped Node v18
  • Dropped CommonJS (ESM only)
  • Updated tsgo to one of the latest versions
  • Bumped the ts version
  • Added eslint import rules to tidy up imports
  • cleaned-up package.json files - client-sdk and server-sdk ship with the minimum required dependencies (as opposed to v1, which shipped server deps if you were only interested in the client and vice versa
  • introduce catalogs for reusing dep versions
  • bundling tool change - tsdown
  • updated docs
How Has This Been Tested?
Unit, integration tests
Breaking Changes
v2
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
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npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/client@1279

npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/server@1279

commit: c3b1a40
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Is there a way we can break this PR up somehow so that this is more reviewable? E.g. with using git mv to preserve history and provenance of files? As it is it'll be quite hard to verify correctness of the split.
@KKonstantinov
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EDITs:
  • Provenance / history retained (except 3-4 files, will review them and bring it to them as well)
  • Dropped Node v18
  • Dropped CommonJS (ESM only)
  • Updated tsgo to one of the latest versions
  • Bumped the ts version
  • Added eslint import rules to tidy up imports
  • cleaned-up package.json files - client-sdk and server-sdk ship with the minimum required dependencies (as opposed to v1, which shipped server deps if you were only interested in the client and vice versa
  • introduce catalogs for reusing dep versions
  • bundling tool change - tsdown as per @mattzcarey
  • updated docs
TODOs still:
  • test(18) check - no code change, repository config -> needs to be removed as required check from branch rulesets, and replaced with test(20)
@KKonstantinovKKonstantinov
added this to the v2 milestone
Dec 12, 2025
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SDK V2
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[v2] Мonorepo,sdk-client,sdk-server,sdk-corepackage split (m…
8ae33e3
…odelcontextprotocol#1279)
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[v2] Мonorepo, `sdk-client`, `sdk-server`, `sdk-core` package split by KKonstantinov · Pull Request #1279 · modelcontextprotocol/typescript-sdk · GitHub
Skip to content
[v2] Мonorepo, sdk-client, sdk-server, sdk-core package split - #1279
Merged
felixweinberger merged 61 commits into
modelcontextprotocol:mainfrom 
KKonstantinov:feature/v2-monorepo-setup
Dec 19, 2025
Merged
[v2] Мonorepo, sdk-client, sdk-server, sdk-core package split#1279
felixweinberger merged 61 commits into
modelcontextprotocol:mainfrom 
KKonstantinov:feature/v2-monorepo-setup
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Proof of Concept: v2 monorepo, package split
Motivation and Context
v1 of the sdk shipped both client and server in the same package, introducing extra dependencies to users who have a single concern (client or server only). Client and server packages are now split, depending on a shared core package.
Additionally, v1 exported all files as the public API of the SDK, limiting the SDK ability to iterate internally while keeping backwards compatibility. Barrel files are now introduced as the single entrypoint to the SDK and defining the public API of the SDK.
  • Dropped Node v18
  • Dropped CommonJS (ESM only)
  • Updated tsgo to one of the latest versions
  • Bumped the ts version
  • Added eslint import rules to tidy up imports
  • cleaned-up package.json files - client-sdk and server-sdk ship with the minimum required dependencies (as opposed to v1, which shipped server deps if you were only interested in the client and vice versa
  • introduce catalogs for reusing dep versions
  • bundling tool change - tsdown
  • updated docs
How Has This Been Tested?
Unit, integration tests
Breaking Changes
v2
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
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Is there a way we can break this PR up somehow so that this is more reviewable? E.g. with using git mv to preserve history and provenance of files? As it is it'll be quite hard to verify correctness of the split.
@KKonstantinov
KKonstantinov
commented
Dec 12, 2025•

edited

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ContributorAuthor
EDITs:
  • Provenance / history retained (except 3-4 files, will review them and bring it to them as well)
  • Dropped Node v18
  • Dropped CommonJS (ESM only)
  • Updated tsgo to one of the latest versions
  • Bumped the ts version
  • Added eslint import rules to tidy up imports
  • cleaned-up package.json files - client-sdk and server-sdk ship with the minimum required dependencies (as opposed to v1, which shipped server deps if you were only interested in the client and vice versa
  • introduce catalogs for reusing dep versions
  • bundling tool change - tsdown as per @mattzcarey
  • updated docs
TODOs still:
  • test(18) check - no code change, repository config -> needs to be removed as required check from branch rulesets, and replaced with test(20)
@KKonstantinovKKonstantinov
added this to the v2 milestone
Dec 12, 2025
@KKonstantinovKKonstantinov
linked an issue
Dec 12, 2025
that may be
closed
by this pull request


SDK V2
#809

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23 tasks

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@KKonstantinovmozmo15
[v2] Мonorepo,sdk-client,sdk-server,sdk-corepackage split (m…
8ae33e3
…odelcontextprotocol#1279)
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Auto-enable theater mode on YouTube
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function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
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(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
[v2] Мonorepo, `sdk-client`, `sdk-server`, `sdk-core` package split by KKonstantinov · Pull Request #1279 · modelcontextprotocol/typescript-sdk · GitHub
Skip to content
[v2] Мonorepo, sdk-client, sdk-server, sdk-core package split - #1279
Merged
felixweinberger merged 61 commits into
modelcontextprotocol:mainfrom 
KKonstantinov:feature/v2-monorepo-setup
Dec 19, 2025
Merged
[v2] Мonorepo, sdk-client, sdk-server, sdk-core package split#1279
felixweinberger merged 61 commits into
modelcontextprotocol:mainfrom 
KKonstantinov:feature/v2-monorepo-setup
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@KKonstantinov
@KKonstantinovKKonstantinov
commented
Dec 10, 2025•

edited

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Proof of Concept: v2 monorepo, package split
Motivation and Context
v1 of the sdk shipped both client and server in the same package, introducing extra dependencies to users who have a single concern (client or server only). Client and server packages are now split, depending on a shared core package.
Additionally, v1 exported all files as the public API of the SDK, limiting the SDK ability to iterate internally while keeping backwards compatibility. Barrel files are now introduced as the single entrypoint to the SDK and defining the public API of the SDK.
  • Dropped Node v18
  • Dropped CommonJS (ESM only)
  • Updated tsgo to one of the latest versions
  • Bumped the ts version
  • Added eslint import rules to tidy up imports
  • cleaned-up package.json files - client-sdk and server-sdk ship with the minimum required dependencies (as opposed to v1, which shipped server deps if you were only interested in the client and vice versa
  • introduce catalogs for reusing dep versions
  • bundling tool change - tsdown
  • updated docs
How Has This Been Tested?
Unit, integration tests
Breaking Changes
v2
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
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npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/client@1279

npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/server@1279

commit: c3b1a40
@KKonstantinovKKonstantinov
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v2
Ideas, requests and plans for v2 of the SDK which will incorporate major changes and fixes
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Is there a way we can break this PR up somehow so that this is more reviewable? E.g. with using git mv to preserve history and provenance of files? As it is it'll be quite hard to verify correctness of the split.
@KKonstantinov
KKonstantinov
commented
Dec 12, 2025•

edited

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ContributorAuthor
EDITs:
  • Provenance / history retained (except 3-4 files, will review them and bring it to them as well)
  • Dropped Node v18
  • Dropped CommonJS (ESM only)
  • Updated tsgo to one of the latest versions
  • Bumped the ts version
  • Added eslint import rules to tidy up imports
  • cleaned-up package.json files - client-sdk and server-sdk ship with the minimum required dependencies (as opposed to v1, which shipped server deps if you were only interested in the client and vice versa
  • introduce catalogs for reusing dep versions
  • bundling tool change - tsdown as per @mattzcarey
  • updated docs
TODOs still:
  • test(18) check - no code change, repository config -> needs to be removed as required check from branch rulesets, and replaced with test(20)
@KKonstantinovKKonstantinov
added this to the v2 milestone
Dec 12, 2025
@KKonstantinovKKonstantinov
linked an issue
Dec 12, 2025
that may be
closed
by this pull request


SDK V2
#809

Closed

23 tasks

This was referenced Jan 12, 2026
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This was referenced Jan 19, 2026
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 Open

 Open

 Open


This was referenced Jan 29, 2026
 Merged

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This was referenced Feb 6, 2026
 Open

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This was referenced Feb 15, 2026
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to mozmo15/typescript-sdk
that referenced
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Mar 30, 2026
@KKonstantinovmozmo15
[v2] Мonorepo,sdk-client,sdk-server,sdk-corepackage split (m…
8ae33e3
…odelcontextprotocol#1279)
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SDK V2


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(function(){
try {
var __m = "*";
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[v2] Мonorepo, `sdk-client`, `sdk-server`, `sdk-core` package split by KKonstantinov · Pull Request #1279 · modelcontextprotocol/typescript-sdk · GitHub
Skip to content
[v2] Мonorepo, sdk-client, sdk-server, sdk-core package split - #1279
Merged
felixweinberger merged 61 commits into
modelcontextprotocol:mainfrom 
KKonstantinov:feature/v2-monorepo-setup
Dec 19, 2025
Merged
[v2] Мonorepo, sdk-client, sdk-server, sdk-core package split#1279
felixweinberger merged 61 commits into
modelcontextprotocol:mainfrom 
KKonstantinov:feature/v2-monorepo-setup
Conversation
@KKonstantinov
@KKonstantinovKKonstantinov
commented
Dec 10, 2025•

edited

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Proof of Concept: v2 monorepo, package split
Motivation and Context
v1 of the sdk shipped both client and server in the same package, introducing extra dependencies to users who have a single concern (client or server only). Client and server packages are now split, depending on a shared core package.
Additionally, v1 exported all files as the public API of the SDK, limiting the SDK ability to iterate internally while keeping backwards compatibility. Barrel files are now introduced as the single entrypoint to the SDK and defining the public API of the SDK.
  • Dropped Node v18
  • Dropped CommonJS (ESM only)
  • Updated tsgo to one of the latest versions
  • Bumped the ts version
  • Added eslint import rules to tidy up imports
  • cleaned-up package.json files - client-sdk and server-sdk ship with the minimum required dependencies (as opposed to v1, which shipped server deps if you were only interested in the client and vice versa
  • introduce catalogs for reusing dep versions
  • bundling tool change - tsdown
  • updated docs
How Has This Been Tested?
Unit, integration tests
Breaking Changes
v2
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
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npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/client@1279

npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/server@1279

commit: c3b1a40
@KKonstantinovKKonstantinov
added
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v2
Ideas, requests and plans for v2 of the SDK which will incorporate major changes and fixes
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Is there a way we can break this PR up somehow so that this is more reviewable? E.g. with using git mv to preserve history and provenance of files? As it is it'll be quite hard to verify correctness of the split.
@KKonstantinov
KKonstantinov
commented
Dec 12, 2025•

edited

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EDITs:
  • Provenance / history retained (except 3-4 files, will review them and bring it to them as well)
  • Dropped Node v18
  • Dropped CommonJS (ESM only)
  • Updated tsgo to one of the latest versions
  • Bumped the ts version
  • Added eslint import rules to tidy up imports
  • cleaned-up package.json files - client-sdk and server-sdk ship with the minimum required dependencies (as opposed to v1, which shipped server deps if you were only interested in the client and vice versa
  • introduce catalogs for reusing dep versions
  • bundling tool change - tsdown as per @mattzcarey
  • updated docs
TODOs still:
  • test(18) check - no code change, repository config -> needs to be removed as required check from branch rulesets, and replaced with test(20)
@KKonstantinovKKonstantinov
added this to the v2 milestone
Dec 12, 2025
@KKonstantinovKKonstantinov
linked an issue
Dec 12, 2025
that may be
closed
by this pull request


SDK V2
#809

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This was referenced Jan 29, 2026
 Merged

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This was referenced Feb 6, 2026
 Open

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This was referenced Feb 15, 2026
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mozmo15 pushed a commit
to mozmo15/typescript-sdk
that referenced
this pull request
Mar 30, 2026
@KKonstantinovmozmo15
[v2] Мonorepo,sdk-client,sdk-server,sdk-corepackage split (m…
8ae33e3
…odelcontextprotocol#1279)
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Development

Successfully merging this pull request may close these issues.

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Publish separate client and server packages

SDK V2


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filter: none !important;
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filter: invert(1) hue-rotate(180deg) !important;
background: #2d2d44 !important;
border-color: #444 !important;
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';
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var style = document.getElementById('universal-dark-mode-style');
if (style) style.remove();
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enabled = !enabled;
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applyDarkMode();
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})();
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();
[v2] Мonorepo, `sdk-client`, `sdk-server`, `sdk-core` package split by KKonstantinov · Pull Request #1279 · modelcontextprotocol/typescript-sdk · GitHub
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[v2] Мonorepo, sdk-client, sdk-server, sdk-core package split - #1279
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felixweinberger merged 61 commits into
modelcontextprotocol:mainfrom 
KKonstantinov:feature/v2-monorepo-setup
Dec 19, 2025
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[v2] Мonorepo, sdk-client, sdk-server, sdk-core package split#1279
felixweinberger merged 61 commits into
modelcontextprotocol:mainfrom 
KKonstantinov:feature/v2-monorepo-setup
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@KKonstantinovKKonstantinov
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Dec 10, 2025•

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Proof of Concept: v2 monorepo, package split
Motivation and Context
v1 of the sdk shipped both client and server in the same package, introducing extra dependencies to users who have a single concern (client or server only). Client and server packages are now split, depending on a shared core package.
Additionally, v1 exported all files as the public API of the SDK, limiting the SDK ability to iterate internally while keeping backwards compatibility. Barrel files are now introduced as the single entrypoint to the SDK and defining the public API of the SDK.
  • Dropped Node v18
  • Dropped CommonJS (ESM only)
  • Updated tsgo to one of the latest versions
  • Bumped the ts version
  • Added eslint import rules to tidy up imports
  • cleaned-up package.json files - client-sdk and server-sdk ship with the minimum required dependencies (as opposed to v1, which shipped server deps if you were only interested in the client and vice versa
  • introduce catalogs for reusing dep versions
  • bundling tool change - tsdown
  • updated docs
How Has This Been Tested?
Unit, integration tests
Breaking Changes
v2
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
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npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/client@1279

npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/server@1279

commit: c3b1a40
@KKonstantinovKKonstantinov
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Ideas, requests and plans for v2 of the SDK which will incorporate major changes and fixes
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Dec 10, 2025
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Is there a way we can break this PR up somehow so that this is more reviewable? E.g. with using git mv to preserve history and provenance of files? As it is it'll be quite hard to verify correctness of the split.
@KKonstantinov
KKonstantinov
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EDITs:
  • Provenance / history retained (except 3-4 files, will review them and bring it to them as well)
  • Dropped Node v18
  • Dropped CommonJS (ESM only)
  • Updated tsgo to one of the latest versions
  • Bumped the ts version
  • Added eslint import rules to tidy up imports
  • cleaned-up package.json files - client-sdk and server-sdk ship with the minimum required dependencies (as opposed to v1, which shipped server deps if you were only interested in the client and vice versa
  • introduce catalogs for reusing dep versions
  • bundling tool change - tsdown as per @mattzcarey
  • updated docs
TODOs still:
  • test(18) check - no code change, repository config -> needs to be removed as required check from branch rulesets, and replaced with test(20)
@KKonstantinovKKonstantinov
added this to the v2 milestone
Dec 12, 2025
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SDK V2
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[v2] Мonorepo,sdk-client,sdk-server,sdk-corepackage split (m…
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…odelcontextprotocol#1279)
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@mattzcareymattzcareymattzcarey left review comments
@felixweinbergerfelixweinbergerfelixweinberger approved these changes

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

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ESM only (if feasible)

Publish separate client and server packages

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