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Semiotic

by nteract · remote · local (npm) · no sign-in to list tools · v3.12.1 · published by GitHub user nteract

Verified React chart generation: select, validate, repair, render, and inspect charts through MCP.

Changes · 3
CompareRegistry entry

5 tools: 3 change things and 2 only read.

Scanned Oct 21, 2026

2 checks matched something in the tool definitions. No finding is not a safety guarantee. How the checks work.

claude mcp add --transport http semiotic https://semiotic-mcp-server-481507046413.us-west1.run.app/mcp

Findings

Matches of fixed checks, with the text they matched.

2 warn
  • WarncreateChart

    The server marks "createChart" read-only (readOnlyHint: true), and its own name, description or input give the class "write".

    Matched text

    annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "createChart" says "create": a word for a change.

    What this check looks for
  • WarnauditChart

    The server marks "auditChart" read-only (readOnlyHint: true), and its own name, description or input give the class "write".

    Matched text

    annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The description's first verb is "run": a word for a change.

    What this check looks for

Tools

Open a tool for its reasons and full description. Descriptions are the publisher's own words, shown as they are.

5 tools

Changes things 3Claude Code: ask
  • auditChartRun design diagnostics plus accessibility and mobile audits, returning prioritized structured findings.1 finding

    Why it is in this group

    • The description's first verb is "run": a word for a change.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.

    Findings

    • Warn

      The server marks "auditChart" read-only (readOnlyHint: true), and its own name, description or input give the class "write".

      Matched text

      annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The description's first verb is "run": a word for a change.

      What this check looks for
    Description, as the server wrote it
    Run design diagnostics plus accessibility and mobile audits, returning prioritized structured findings.

    Annotations the server declares

    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
  • createChartSelect, validate, diagnose, render, and prove a static-data Semiotic chart.1 finding

    Why it is in this group

    • The name "createChart" says "create": a word for a change.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.

    Findings

    • Warn

      The server marks "createChart" read-only (readOnlyHint: true), and its own name, description or input give the class "write".

      Matched text

      annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "createChart" says "create": a word for a change.

      What this check looks for
    Description, as the server wrote it
    Select, validate, diagnose, render, and prove a static-data Semiotic chart. This is the default public workflow.

    Annotations the server declares

    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
  • improveChartDiagnose a chart configuration, assess data fit, and propose repairs or variants.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
    Description, as the server wrote it
    Diagnose a chart configuration, assess data fit, and propose repairs or variants.

    Annotations the server declares

    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
Only reads 2Claude Code: allow
  • explainChartReturn reader grounding: chart description, communicative intent, and navigable data structure.No findings

    Why it is in this group

    • The name "explainChart" says "explain": a word for reading.
    Description, as the server wrote it
    Return reader grounding: chart description, communicative intent, and navigable data structure.

    Annotations the server declares

    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
  • getChartSchemaReturn canonical Semiotic prop-schema guidance for code editing and advanced configuration.No findings

    Why it is in this group

    • The name "getChartSchema" says "get": a word for reading.
    Description, as the server wrote it
    Return canonical Semiotic prop-schema guidance for code editing and advanced configuration.

    Annotations the server declares

    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Install

Pinned to version 3.12.1. Values in angle brackets are yours to fill in.

claude mcp add --transport http semiotic https://semiotic-mcp-server-481507046413.us-west1.run.app/mcp

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json
{
  "permissions": {
    "allow": [
      "mcp__semiotic__explainChart",
      "mcp__semiotic__getChartSchema"
    ],
    "ask": [
      "mcp__semiotic__createChart",
      "mcp__semiotic__improveChart",
      "mcp__semiotic__auditChart"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. It assumes the server is installed as semiotic. Review it before you use it.