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build(deps): bump github.com/modelcontextprotocol/go-sdk from 1.6.0 to 1.6.1#2541

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build(deps): bump github.com/modelcontextprotocol/go-sdk from 1.6.0 to 1.6.1#2541
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@dependabot dependabot Bot commented on behalf of github May 25, 2026

Bumps github.com/modelcontextprotocol/go-sdk from 1.6.0 to 1.6.1.

Release notes

Sourced from github.com/modelcontextprotocol/go-sdk's releases.

v1.6.1

This release adds an MCPGODEBUG flag to opt out of the Content-Type check on POST requests.

Behavior Changes

Prior to v1.6.0 (v1.4.0...v1.5.0), the Content-Type check on POST requests was gated by the same disablecrossoriginprotection MCPGODEBUG flag as the cross-origin protection. In v1.6.0, the cross-origin protection was disabled by default (replaced by the opt-in enableoriginverification flag), but the Content-Type check was kept on unconditionally, leaving no way to disable it. This release restores an escape hatch for both the Streamable HTTP and SSE transports: setting MCPGODEBUG=disablecontenttypecheck=1 skips the Content-Type: application/json validation on POST requests. See #957.

What's Changed

Full Changelog: modelcontextprotocol/go-sdk@v1.6.0...v1.6.1

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Bumps [github.com/modelcontextprotocol/go-sdk](https://github.com/modelcontextprotocol/go-sdk) from 1.6.0 to 1.6.1.
- [Release notes](https://github.com/modelcontextprotocol/go-sdk/releases)
- [Commits](modelcontextprotocol/go-sdk@v1.6.0...v1.6.1)

---
updated-dependencies:
- dependency-name: github.com/modelcontextprotocol/go-sdk
  dependency-version: 1.6.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
@dependabot dependabot Bot added dependencies Pull requests that update a dependency file go Pull requests that update go code labels May 25, 2026
@dependabot dependabot Bot requested a review from a team as a code owner May 25, 2026 22:29
@dependabot dependabot Bot added dependencies Pull requests that update a dependency file go Pull requests that update go code labels May 25, 2026
github-actions Bot and others added 2 commits May 25, 2026 22:30
SamMorrowDrums added a commit that referenced this pull request May 28, 2026
Bumps github.com/modelcontextprotocol/go-sdk from v1.6.0 to v1.6.1 and
removes the CrossOriginProtection bypass we previously installed on the
StreamableHTTP handler.

As of go-sdk v1.6.0 the cross-origin check is opt-in: a nil
CrossOriginProtection on StreamableHTTPOptions means no check is run.
v1.6.1 also marks the field itself as deprecated (the SDK recommends
wrapping the handler with middleware instead, and the field will be
removed in v1.8.0).

This server authenticates via bearer tokens, not cookies, so the
Sec-Fetch-Site CSRF check is unnecessary and would block browser-based
MCP clients. Leaving CrossOriginProtection unset preserves that
behavior without depending on a deprecated API.

Supersedes #2541.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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