chore(deps): Update dependency mcp to v2

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
mcp	>=1.28.1 → >=2.1.1

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Release Notes

modelcontextprotocol/python-sdk (mcp)

v2.1.1

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What's Changed

• Point imports of mcp.server.fastmcp at the migration guide by @​maxisbey in #​3388

Full Changelog: modelcontextprotocol/python-sdk@v2.1.0...v2.1.1

v2.1.0

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Highlights

• Client accepts StdioServerParameters directly: Client(StdioServerParameters(command="uv", args=["run", "server.py"])) (#​3321).
• Prompt messages accept Image and Audio, prompt functions may return bare content blocks, and Message / UserMessage / AssistantMessage are exported from mcp.server.mcpserver (#​3320).
• The 4 MiB request body limit now also covers the SSE transport and the OAuth endpoints; SseServerTransport and MCPServer.sse_app() take max_request_body_size, and the SSE message endpoint answers 405 to non-POST requests (#​3336).

Behaviour changes to be aware of

• Handler exceptions (#​3314): an unexpected exception from a tool, resource or prompt handler is logged once at ERROR with its traceback, and the client now sees only Error executing tool <name> (or the resource/prompt equivalent) rather than the exception text. Raise ToolError / ResourceError when the message is meant for the model; those still reach the client and are logged at INFO without a traceback.
• Content-block return annotations (#​3320): a tool annotated to return TextContent, EmbeddedResource, Image, Audio, or lists/unions of them no longer advertises outputSchema or returns structuredContent; its content is unchanged. Pass structured_output=True to keep the previous shape.

Fixes

• TypedDict tool results: NotRequired keys are omitted instead of serialized as null, and registration no longer fails on Python 3.10 (#​3224, #​3227); recursive return types get an object-rooted outputSchema that pre-2026 clients accept (#​3337).
• 2026-07-28 over HTTP: a POSTed notification such as notifications/cancelled is acknowledged with 202 instead of rejected with 400 (#​3324).
• Pre-2026 sessions ignore cache-hint fields from later revisions instead of failing list_tools() (#​3223), and accept boolean sub-schemas in tool schema properties (#​3353).
• mcp install reads and preserves a Claude Desktop config containing non-ASCII text on any Windows code page (#​3296).

What's Changed

• Retire wording tied to pre-2.0 milestones by @​maxisbey in #​3211
• Describe the maintenance line without hardcoding 1.28 by @​maxisbey in #​3212
• Ask which release line a bug report is on by @​maxisbey in #​3213
• Link the released 2026-07-28 spec and point migrators at /v1/ by @​maxisbey in #​3214
• Bump conformance harness to 0.2.0-alpha.11 by @​maxisbey in #​3282
• Read UTF-8 test fixtures with explicit encoding by @​ShuQingDollarVoyager in #​3245
• Pin each conformance leg to a spec-revision wire by @​maxisbey in #​3304
• docs: publish translated docs in twelve languages and the tool that maintains them by @​maxisbey in #​3280
• Pin text I/O to UTF-8 and fail CI on locale-dependent reads/writes by @​maxisbey in #​3296
• docs: lead the README client example with a URL, not the server object by @​maxisbey in #​3315
• Publish versioning, roadmap, and dependency policies for v2 by @​maxisbey in #​3215
• Drop later-revision cache-hint fields on pre-2026 sessions by @​maxisbey in #​3223
• Stop framing breaking changes as a workflow in AGENTS.md by @​maxisbey in #​3286
• MCPServer: content-block returns are unstructured, prompt messages take Image/Audio by @​maxisbey in #​3320
• Let Client take StdioServerParameters directly by @​maxisbey in #​3321
• Gate external PRs on an assigned, linked issue by @​maxisbey in #​3291
• docs: cover the remaining Tier 1 audit items by @​maxisbey in #​3325
• Acknowledge notification POSTs with 202 on the 2026-07-28 HTTP entry by @​maxisbey in #​3326
• Shorten stdio test comments by @​Kludex in #​3329
• Hand TypedDict tool results to pydantic natively by @​maxisbey in #​3331
• Apply the request body limit to the SSE and OAuth endpoints by @​maxisbey in #​3336
• Accept boolean sub-schemas in 2025-11-25 tool schema properties by @​pja-ant in #​3354
• Log MCPServer handler exceptions by kind and keep crash details off the wire by @​maxisbey in #​3314
• Give recursive tool return types an object-rooted output schema by @​maxisbey in #​3376
• docs: refresh translations for recent English changes by @​maxisbey in #​3379
• Build releases with the pinned hatchling and a publish action that accepts Metadata 2.5 by @​maxisbey in #​3380

New Contributors

• @​ShuQingDollarVoyager made their first contribution in #​3245

Full Changelog: modelcontextprotocol/python-sdk@v2.0.0...v2.1.0

v2.0.1

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One off backport of the FastMCP import warning for 2.0.x, this is due to a lot of people running into this error and making issues on other repos about it. Ideally either pin mcp<2 or upgrade to 2.

What's Changed

• [v2.0.x] Point imports of mcp.server.fastmcp at the migration guide by @​maxisbey in #​3393

Full Changelog: modelcontextprotocol/python-sdk@v2.0.0...v2.0.1

v2.0.0

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MCP Python SDK v2 Stable Release

This is v2.0.0, the stable v2 release of the MCP Python SDK. It supports the 2026-07-28 revision of the Model Context Protocol and serves every earlier revision from the same server. pip install mcp now installs 2.x.

pip install "mcp[cli]"

# or
uv add "mcp[cli]"

Documentation Rewrite

The documentation has the full tutorial and API reference. Coming from v1? What's new in v2 is the tour of what changed and why, and the migration guide lists every breaking change with before-and-after code.

V1 Maintenance mode

v1.x is in maintenance mode and will only receive security fixes from now on The 1.x line lives on the v1.x branch, continues to receive critical bug fixes and security patches, and is documented at https://py.sdk.modelcontextprotocol.io/v1/. If your project is not ready to migrate, keep a <2 upper bound on your requirement (for example mcp>=1.28,<2).

Highlights

One SDK, both protocol eras

v2 speaks the 2026-07-28 revision (stateless requests with no handshake, server/discover, subscriptions/listen, multi-round-trip requests) and still serves every 2025-era client from the same MCPServer, over Streamable HTTP and stdio, with nothing to configure. Client(target) negotiates the version automatically.

FastMCP is now MCPServer, and there is a first-class Client

The decorator API is unchanged; the low-level Server is rebuilt around a shared dispatcher engine, and one Client object replaces v1's transport-plus-ClientSession-plus-initialize() layering. It connects to a URL, a stdio subprocess, a custom transport, or straight to a server object in memory for tests.

Multi-round-trip requests and resolver dependency injection

At 2026-07-28 the server can no longer call the client, so tools return the question instead. A Resolve(fn) parameter is filled by your function invisibly to the model and can put a question to the user; one tool body serves both eras.

Extension APIs, OpenTelemetry, and a standalone types package

Servers and clients compose protocol extensions through pluggable extension APIs (MCP Apps built in); OpenTelemetry tracing ships on by default; every protocol type is its own package, mcp-types (imported as mcp_types), published in lock-step with mcp.

Hardened stdio and auth

stdio servers keep handler subprocesses and stray prints off the wire, and stdout is diverted to stderr while serving. OAuth adds RFC 9207 issuer validation, the SEP-990 identity-assertion flow, and the client-credentials extension.

Coming from a v2 pre-release

Since the last release candidate: the per-version wire packages are private (mcp_types._v*), mcp.types is a permanent alias for mcp_types, the auth registration request model is split from the registered-client record, cancelled requests are no longer answered, and log notifications are gated on the per-request log-level opt-in at 2026-07-28. Since the betas: Client(cache=False) is now cache=None with CacheConfig() the default; Context.client_id, RFC7523OAuthClientProvider, and OAuthClientProvider(timeout=) are removed; the client-credentials providers take scope=; message_handler receives notifications and exceptions only; FileResource(is_binary=) becomes encoding; MCP_* env vars are gone with pydantic-settings; Streamable HTTP servers reject bodies over 4 MiB with HTTP 413. The migration guide covers all of it.

Known gaps

The tasks extension (SEP-2663) is not part of this release. On the client, the DPoP proof binding (SEP-1932) and the workload-identity jwt-bearer grant are not implemented; both are additive and can land in 2.x.

Feedback

Something rough, confusing, or broken? Open an issue or find us in #python-sdk-dev on the MCP Contributors Discord.

Full Changelog: modelcontextprotocol/python-sdk@v2.0.0rc1...v2.0.0

v1.29.1

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What's Changed

• [v1.x] Complete the FastMCP Settings model at import time by @​maxisbey in #​3352
• [v1.x] Apply the request body limit to the SSE and OAuth endpoints by @​maxisbey in #​3344
• [v1.x] Give recursive tool return types an object-rooted output schema by @​maxisbey in #​3377

Full Changelog: modelcontextprotocol/python-sdk@v1.29.0...v1.29.1

v1.29.0

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What's Changed

• [v1.x] Route Context.report_progress() to the originating request stream by @​maxisbey in #​2994
• [v1.x] docs: publish llms.txt and markdown renditions of the docs by @​maxisbey in #​3029
• [v1.x] docs: pin mkdocs<2 by @​maxisbey in #​3074
• [v1.x] Add Streamable HTTP request body limits by @​Kludex in #​3101
• [v1.x] fix: reject trailing newline in tool-name validation by @​maxisbey in #​3086
• [v1.x] ci: pick the docs toolchain per worktree in build-docs.sh by @​maxisbey in #​3082
• [v1.x] Move the v1.x docs to /v1/ and mark v1.x as the maintenance line by @​maxisbey in #​3177

Full Changelog: modelcontextprotocol/python-sdk@v1.28.1...v1.29.0

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[lusoris]

Superseded by #1130, which batches this update together with 35 other pending dependency PRs into a single branch and a single CI run.

Batching was necessary: 45 concurrent dependency PRs could not drain through the merge gate (see #1127 / ADR-1123), and the full macOS/ARM/CUDA/SYCL matrix is disproportionate for a one-line manifest edit. Your change is included verbatim in #1130 — where a minor and a major targeted the same dependency, the major won.

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