Koskamo

Zovo Sequence Diagram MCP

Converts plain text descriptions into UML sequence diagrams, supporting participants, sync/async messages, notes, and control flow blocks like alt/else/loop. Outputs include PDF, SVG, and CSV files, with validation checks for grammar and drawing integrity.

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Endpoint and access

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Zovo Sequence Diagram MCP logo, by ZovoCommunity listingStreamable HTTPNo sign-inEndpoint checked 2026-11-08Published by Zovo
You need:No sign-in is needed.
MCP endpoint (Streamable HTTP)
https://sequence-diagram.zovo.one/mcp
Vendor documentation

What its tools do

2 tools, grouped by the hints the server advertises. Hints are self-declared, not verified behavior.

Read-only (2)

2 of 2 have a description · 2 of 2 declare behavior hints · 2 of 2 with parameters document them all

Checks and signals

Each line is separate evidence, not a trust score.

  • Passed Endpoint answered the live check ·
  • Availability 1 of 1 checks passed in 30 days

What you can do with it

  • Generate UML sequence diagrams from text
  • Validate sequence diagram syntax
  • Export diagrams to PDF, SVG, or CSV

Source and maintenance

Community listingRegistry 1.0.0
mcp-registry: io.github.theluckystrike/sequence-diagram@1.0.0Project website

Protocol and capabilities

Server
sequence-diagram 1.0.0
MCP protocol negotiated in check
2025-11-25
Tools
2 advertised
Resources
1 advertised
Resource templates
1 advertised
Prompts
Not advertised
Server-advertised capabilities
{
  "tools": {
    "listChanged": true
  },
  "resources": {
    "listChanged": true
  }
}

Server-provided instructions

Untrusted server output shown for inspection. It is not Koskamo guidance and is excluded from knowledge search.

Zovo Sequence Diagram draws a UML sequence diagram from a short line grammar, with PDF, SVG and CSV downloads. Use make_sequence_diagram to draw it and check_sequence to check the text without drawing. Grammar, one statement per line: participant Name, actor Name, participant "Long Name" as Alias; A -> B: text (sync), A ->> B: text (async), A --> B: text (reply), A -> A: text (self); note over A: text or note over A,B: text; alt condition, else condition, end; loop condition, end; opt condition, end; activate A, deactivate A; # or %% comment lines. A line outside the grammar is refused with its line number and the token, and nothing is drawn. When the user describes a flow in words, write it in this grammar first and show it to the user with the result. Files of large diagrams are kept for 1 hour so the download links work, then deleted.

Tools

2 advertised

make_sequence_diagram — Make sequence diagram
Advertised by the server during the last successful anonymous check.
Advertised read-only

Use this when the user wants a UML sequence diagram drawn, for example "draw a sequence diagram of the login flow" or "make a PDF of these API calls". Takes the diagram text in a line grammar: participant Name / actor Name / participant "Long Name" as Alias; A -> B: text (sync), A ->> B: text (async), A --> B: text (reply), A -> A: text (self); note over A: text / note over A,B: text; alt cond / else cond / end, loop cond / end, opt cond / end; activate A / deactivate A; # comment lines. When the user describes the flow in words, write it in this grammar first. Returns counts, the messages in order, the blocks with their messages, a check on the drawing (messages in order, frames holding their messages, overlapping labels), the PDF page count and smallest text size, an interactive diagram, and PDF, SVG and CSV downloads. Refuses a line outside the grammar with its line number and token. Up to 30 participants and 400 messages. Does not read features of other diagram languages outside this grammar. A diagram too wide for the paper with text of at least 7 pt gets no PDF (SVG and CSV only), and the result says so. Download links of large diagrams expire after about 1 hour.

make_sequence_diagram input schema
{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "diagram"
  ],
  "properties": {
    "title": {
      "type": "string",
      "maxLength": 400,
      "description": "Title printed on the diagram and used in file names, up to 80 characters, e.g. \"Login flow\"."
    },
    "diagram": {
      "type": "string",
      "maxLength": 200000,
      "description": "The diagram in this line grammar, one statement per line, up to 60,000 characters: participant Name | actor Name | participant \"Long Name\" as Alias; A -> B: text (sync call), A ->> B: text (async), A --> B: text (reply), A -> A: text (self); note over A: text | note over A,B: text; alt condition / else condition / end, loop condition / end, opt condition / end; activate A | deactivate A; lines starting with # or %% are comments. Example: \"actor User\\nUser -> Web: Log in\\nWeb -> DB: Find user\\nDB --> Web: User row\\nalt password ok\\nWeb --> User: Welcome\\nelse wrong password\\nWeb --> User: Try again\\nend\"."
    },
    "page_size": {
      "enum": [
        "letter",
        "a4",
        "tabloid"
      ],
      "type": "string",
      "description": "PDF paper: letter (default), a4 or tabloid (11 x 17 in). Landscape unless portrait needs fewer pages. Example: a4."
    }
  }
}
make_sequence_diagram output schema
{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "title",
    "counts",
    "participants",
    "messages",
    "blocks",
    "pdf",
    "layout_check",
    "warnings",
    "downloads"
  ],
  "properties": {
    "pdf": {
      "type": "object",
      "propertyNames": {
        "type": "string"
      },
      "additionalProperties": {}
    },
    "shown": {
      "type": "object",
      "propertyNames": {
        "type": "string"
      },
      "additionalProperties": {}
    },
    "title": {
      "type": "string"
    },
    "blocks": {
      "type": "array",
      "items": {
        "type": "object",
        "propertyNames": {
          "type": "string"
        },
        "additionalProperties": {}
      }
    },
    "counts": {
      "type": "object",
      "required": [
        "participants",
        "messages",
        "sync",
        "async",
        "reply",
        "self",
        "notes",
        "blocks",
        "max_nesting",
        "open_activations"
      ],
      "properties": {
        "self": {
          "type": "number"
        },
        "sync": {
          "type": "number"
        },
        "async": {
          "type": "number"
        },
        "notes": {
          "type": "number"
        },
        "reply": {
          "type": "number"
        },
        "blocks": {
          "type": "number"
        },
        "messages": {
          "type": "number"
        },
        "max_nesting": {
          "type": "number"
        },
        "participants": {
          "type": "number"
        },
        "open_activations": {
          "type": "number"
        }
      },
      "additionalProperties": false
    },
    "messages": {
      "type": "array",
      "items": {
        "type": "object",
        "propertyNames": {
          "type": "string"
        },
        "additionalProperties": {}
      }
    },
    "warnings": {
      "type": "array",
      "items": {
        "type": "string"
      }
    },
    "downloads": {
      "type": "object",
      "properties": {
        "csv": {
          "type": "string"
        },
        "pdf": {
          "type": "string"
        },
        "svg": {
          "type": "string"
        }
      },
      "additionalProperties": false
    },
    "layout_check": {
      "type": "object",
      "propertyNames": {
        "type": "string"
      },
      "additionalProperties": {}
    },
    "participants": {
      "type": "array",
      "items": {
        "type": "object",
        "propertyNames": {
          "type": "string"
        },
        "additionalProperties": {}
      }
    }
  },
  "additionalProperties": false
}
make_sequence_diagram annotations
{
  "title": "Make sequence diagram",
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}
check_sequence — Check sequence diagram text
Advertised by the server during the last successful anonymous check.
Advertised read-only

Use this when the user wants sequence diagram text checked without a drawing, for example "check my sequence diagram for unclosed blocks" or "which participants have no messages". Takes the same diagram text as make_sequence_diagram. Returns ready true or false; when a line breaks the grammar, the line number, the token and the reason; otherwise the participants with outgoing and incoming message counts, message counts by kind, the blocks with their lines, nesting depth and messages, activate lines with no deactivate, and participants that differ only in upper and lower case. Does not draw the diagram or make files, and does not read features of other diagram languages outside this grammar.

check_sequence input schema
{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "diagram"
  ],
  "properties": {
    "diagram": {
      "type": "string",
      "maxLength": 200000,
      "description": "The diagram in this line grammar, one statement per line, up to 60,000 characters: participant Name | actor Name | participant \"Long Name\" as Alias; A -> B: text (sync call), A ->> B: text (async), A --> B: text (reply), A -> A: text (self); note over A: text | note over A,B: text; alt condition / else condition / end, loop condition / end, opt condition / end; activate A | deactivate A; lines starting with # or %% are comments. Example: \"actor User\\nUser -> Web: Log in\\nWeb -> DB: Find user\\nDB --> Web: User row\\nalt password ok\\nWeb --> User: Welcome\\nelse wrong password\\nWeb --> User: Try again\\nend\"."
    }
  }
}
check_sequence output schema
{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "ready",
    "participants",
    "blocks",
    "activations",
    "error",
    "notes",
    "grammar",
    "limits"
  ],
  "properties": {
    "error": {
      "anyOf": [
        {
          "type": "object",
          "propertyNames": {
            "type": "string"
          },
          "additionalProperties": {}
        },
        {
          "type": "null"
        }
      ]
    },
    "notes": {
      "type": "array",
      "items": {
        "type": "string"
      }
    },
    "ready": {
      "type": "boolean"
    },
    "shown": {
      "type": "object",
      "propertyNames": {
        "type": "string"
      },
      "additionalProperties": {}
    },
    "blocks": {
      "type": "array",
      "items": {
        "type": "object",
        "propertyNames": {
          "type": "string"
        },
        "additionalProperties": {}
      }
    },
    "counts": {
      "type": "object",
      "required": [
        "participants",
        "messages",
        "sync",
        "async",
        "reply",
        "self",
        "notes",
        "blocks",
        "max_nesting",
        "open_activations"
      ],
      "properties": {
        "self": {
          "type": "number"
        },
        "sync": {
          "type": "number"
        },
        "async": {
          "type": "number"
        },
        "notes": {
          "type": "number"
        },
        "reply": {
          "type": "number"
        },
        "blocks": {
          "type": "number"
        },
        "messages": {
          "type": "number"
        },
        "max_nesting": {
          "type": "number"
        },
        "participants": {
          "type": "number"
        },
        "open_activations": {
          "type": "number"
        }
      },
      "additionalProperties": false
    },
    "limits": {
      "type": "object",
      "propertyNames": {
        "type": "string"
      },
      "additionalProperties": {}
    },
    "grammar": {
      "type": "array",
      "items": {
        "type": "string"
      }
    },
    "activations": {
      "type": "object",
      "propertyNames": {
        "type": "string"
      },
      "additionalProperties": {}
    },
    "participants": {
      "type": "array",
      "items": {
        "type": "object",
        "propertyNames": {
          "type": "string"
        },
        "additionalProperties": {}
      }
    }
  },
  "additionalProperties": false
}
check_sequence annotations
{
  "title": "Check sequence diagram text",
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}

Prompts

Not advertised

No prompt definitions available.

Resources

1 advertised

sequence-diagram-widget — Zovo Sequence Diagram view

Advertised by the server during the last successful anonymous check.

Interactive view for Zovo Sequence Diagram.

sequence-diagram-widget URI
ui://widget/sequence-diagram-v1-1.0.0-82b7f07db001c59095f95937f7a55abfd441c269af4f1ee71ad7743cfd18d2f3.html

MIME type: text/html;profile=mcp-app

sequence-diagram-widget-legacy — Zovo Sequence Diagram view (previous versions)

Advertised by the server during the last successful anonymous check.

sequence-diagram-widget-legacy URI template
ui://widget/sequence-diagram-{version}.html

MIME type: text/html;profile=mcp-app

30-day availability

Aggregated from read-only remote checks; this is not a tool-execution or security guarantee.

Successful checks
1 of 1 (100%)
Average latency
676 ms
95th percentile latency
676 ms

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

  • · probe · passed · 676 ms · metadata changed · 2 tool(s), 1 resource(s), 1 resource template(s)

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers the remote server. Use --scope project to write .mcp.json for the repo.
Claude Code configuration
claude mcp add --transport http zovo-sequence-diagram-mcp https://sequence-diagram.zovo.one/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).
Codex configuration
codex mcp add zovo-sequence-diagram-mcp --url https://sequence-diagram.zovo.one/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable zovo-sequence-diagram-mcp in your MCP settings.
Cursor configuration
{
  "mcpServers": {
    "zovo-sequence-diagram-mcp": {
      "url": "https://sequence-diagram.zovo.one/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure).
Cline configuration
{
  "mcpServers": {
    "zovo-sequence-diagram-mcp": {
      "type": "streamableHttp",
      "url": "https://sequence-diagram.zovo.one/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start zovo-sequence-diagram-mcp and inspect its tools.
VS Code configuration
{
  "servers": {
    "zovo-sequence-diagram-mcp": {
      "type": "http",
      "url": "https://sequence-diagram.zovo.one/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.
Gemini CLI configuration
gemini mcp add --transport http zovo-sequence-diagram-mcp https://sequence-diagram.zovo.one/mcp

Claude Desktop

Open Claude Settings > Connectors > Add custom connector, enter this server URL and enable it for the conversation. This is a manual remote-connector handoff, not a desktop JSON configuration.
Claude Desktop configuration
https://sequence-diagram.zovo.one/mcp

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.
Windsurf configuration
{
  "mcpServers": {
    "zovo-sequence-diagram-mcp": {
      "serverUrl": "https://sequence-diagram.zovo.one/mcp"
    }
  }
}

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