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What's new in Mermaid Studio 2026.1.6?

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2026.1.6 Release Notes

Section titled “2026.1.6 Release Notes”

This release makes requirement diagrams and flowcharts easier to work with — better visual cues, smarter error detection, and inline docs for architecture and flowchart syntax.

Highlights

Section titled “Highlights”

  • Smarter MCP diagnostics — AI assistants using analyzeMermaidDiagram now receive suggested fixes alongside errors, giving them actionable information to resolve issues without needing multiple back-and-forth interactions

  • Architecture Diagram Formatter — New formatting options for architecture diagrams help keep complex diagrams organized and readable, with customizable code style settings

  • Architecture & Requirement diagram icons — Architecture and Requirement elements now have distinct icons in the editor and structure view, making it easier to scan and navigate complex diagrams

  • Inline documentation — Architecture and C4 keywords show documentation on hover, while flowchart elements show hints with Command + hover Control + hover

  • Flowchart Link Improvements — Improved parsing for flowchart links, including detection of a number of common mistakes and quick fixes to resolve them

  • Flowchart formatting — New code style options for link chain wrapping and alignment help keep complex flowcharts readable

    Before:

    flowchart LR
        A --> B --> C --> D

    After:

    flowchart LR
        A --> B
          --> C
          --> D

Added

Section titled “Added”
  • Added quick fix descriptions to analyzeMermaidDiagram MCP tool problem reports
  • Added architecture diagram formatter and code style settings
  • Added custom icons for various entities in requirement diagrams
  • Added inline documentation for architecture and flowchart elements
  • Added custom structural icons for architecture diagram elements
  • Added error detection and quick fixes for flowchart inline-text links, arrow left markers, and duplicate link labels
  • Added flowchart link chain wrapping and alignment options to code style settings
  • Added node labels in flowchart node reference completion popup
  • Added smart handling for comma-separated class modifiers in flowcharts (:::class1,class2) with a warning that only the first takes effect
  • Added clickable URL references in requirement diagram property values and file path navigation for docRef values
  • Added error annotation with “Wrap value in quotes” quick fix for requirement property values that clash with Mermaid keywords and property values containing characters invalid in Mermaid’s unquoted string syntax

Changed

Section titled “Changed”
  • Cleaned up flowchart arrow completions
  • Refined requirement diagram icons
  • Improved flowchart formatter pipe label spacing to keep labels adjacent to arrows

Fixed

Section titled “Fixed”
  • Fixed handling of multi-line flow statements in flowchart parser
  • Fixed flowchart inline-text link parsing (-- text -->) including multi-line support and incomplete link detection
  • Fixed timeline formatter wrap continuation lines misaligned when base indent level is set
  • Fixed requirement diagram unquoted text not handling ; characters