build(deps): bump mcp from 1.3.0 to 1.4.0 in /docs

[dependabot]

Bumps mcp from 1.3.0 to 1.4.0.

Release notes

Sourced from mcp's releases.

v1.4.0

This release repairs the subscriptions/listen stream. A host that buffers its responses, the documented Rails controller pattern among them, can decline the method with serve_subscriptions_listen: false instead of answering a modern client with a streaming body it cannot render, and the stream's ordering guarantees are enforced: no notification reaches a client before the acknowledgement, and none follows the graceful closing result.

Added

• Add serve_subscriptions_listen: for hosts that cannot hold an SSE stream open (#533)

Fixed

• Deliver subscriptions/listen notifications only after the acknowledgement (#532)
• Serialize subscriptions/listen writes so the graceful result is the final message (#535)

Changelog

Sourced from mcp's changelog.

[1.4.0] - 2026-08-28

This release repairs the subscriptions/listen stream. A host that buffers its responses, the documented Rails controller pattern among them, can decline the method with serve_subscriptions_listen: false instead of answering a modern client with a streaming body it cannot render, and the stream's ordering guarantees are enforced: no notification reaches a client before the acknowledgement, and none follows the graceful closing result.

Added

• Add serve_subscriptions_listen: for hosts that cannot hold an SSE stream open (#533)

Fixed

• Deliver subscriptions/listen notifications only after the acknowledgement (#532)
• Serialize subscriptions/listen writes so the graceful result is the final message (#535)

Commits

• da4ce54 Merge pull request #536 from koic/release_1_4_0
• 50accf6 Release 1.4.0
• 6b6b641 Merge pull request #535 from koic/serialize_listen_stream_writes_on_teardown
• 7909600 Merge pull request #534 from koic/add_a_docs_preview_rake_task
• 2200cbd Serialize subscriptions/listen writes so the graceful result is the final m...
• 411f6b9 Merge pull request #532 from koic/activate_listen_streams_after_the_acknowled...
• 636e494 Add a rake docs:preview task serving the docs site locally
• 3b79c8e Merge pull request #533 from koic/make_subscriptions_listen_refusable
• 3da0c10 Make subscriptions/listen refusable for hosts that cannot stream
• 5ce308b Deliver subscriptions/listen notifications only after the acknowledgement
• Additional commits viewable in compare view

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Summary by cubic

Bumps mcp in /docs from 1.3.0 to 1.4.0, which also pulls in a simpleidn update to 0.3.0. The new mcp version fixes subscriptions/listen stream ordering and adds a serve_subscriptions_listen: false option for hosts that can't keep SSE streams open.

^{Written for commit 2046606. Summary will update on new commits.}