nteract/semiotic

v3.8.1 Breaking

This release includes 1 breaking change for platform teams planning a safe upgrade.

Published 11d MCP Data & Storage

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✓ No known CVEs patched

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✓ No known CVEs patched in this version

Topics

ai d3 data-visualization nteract react streaming

+1 more

visualization

Affected surfaces

breaking_upgrade

ReleasePort's take

Light signal

editorial:auto 11d

The `/healthz` health‑check alias was removed; only `GET /health` now works. Stateless MCP HTTP rendering no longer cancels request bodies and returns a proven SVG response.

Why it matters: If automation targets `/healthz`, requests will fail after upgrade to v3.8.1; adjust monitoring to use the new `GET /health` endpoint.

Summary

AI summary

Removed deprecated MCP HTTP /healthz endpoint and fixed stateless rendering cancellation.

Changes in this release

Type	Severity	Summary	CVE
Breaking	High	Removed `/healthz` alias; only `GET /health` is supported for health checks. Removed `/healthz` alias; only `GET /health` is supported for health checks. Source: llm_adapter@2026-07-16 Confidence: high	—
Bugfix	Medium	Stateless MCP HTTP rendering no longer cancels request body; createChart returns status: "render-proven" with SVG and evidence. Stateless MCP HTTP rendering no longer cancels request body; createChart returns status: "render-proven" with SVG and evidence. Source: llm_adapter@2026-07-16 Confidence: high	—

Full changelog

Fixed

Stateless MCP HTTP rendering. A normally completed request body no longer
cancels render work; hosted createChart rendering is verified to return
status: "render-proven" with SVG and render evidence.

Changed

MCP HTTP health endpoint. GET /health is the supported health and
deployment-identity endpoint; the unnecessary /healthz alias was removed.
Hosted release channels. Nightly continues to validate main; stable
deployments remain separately release-pinned to the published npm package.

Breaking Changes

Removed deprecated `/healthz` alias; only `GET /health` is supported as the health and deployment‑identity endpoint.

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About nteract/semiotic

React data visualization MCP server with 30+ chart types. 5 tools: suggest charts for a dataset, render validated React configs to SVG, diagnose configuration anti-patterns, get component schemas, and report issues.

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Related context

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Earlier breaking changes

v3.8.0 Deprecates `GuantletChart` typo alias; use `GauntletChart`. Migration required.
v3.6.0 Changes DifferenceChart to accept 2+ series via top‑2 subselection, adding caveats for extra series.
v3.6.0 Changes AreaChart to a single‑series chart; multi‑series inputs are subselected.