BPMN Live MCP

add_bpmn_element

Add tasks, gateways, events, and other BPMN elements to an existing diagram to build or extend workflow models.

Instructions

Add an element (task, gateway, event, etc.) to a BPMN diagram

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "diagramId": "<diagramId>",
      "elementType": "<elementType>"
    },
    "name": "add_bpmn_element"
  }
}

Input Schema

Name	Required	Description
`x`	No	X coordinate for the element (default: 100)
`y`	No	Y coordinate for the element (default: 100)
`name`	No	The name/label for the element
`diagramId`	Yes	The diagram ID returned from create_bpmn_diagram
`isExpanded`	No	Whether a subprocess or participant is expanded
`elementType`	Yes	The type of BPMN element to add
`hostElementId`	No	Host element ID for boundary events
`parentElementId`	No	Optional parent container ID, required for lanes and nested elements
`eventDefinitionType`	No	Optional event definition type, for example bpmn:TimerEventDefinition

Schema Changelog

Changes observed during successful MCP inspections.

First observedv1.0.0Sep 28, 2026

TDQS

C2.9/5.0

Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations are provided, so the description carries the full burden for a mutation tool. It does not state whether the modeler must be open, whether changes are reversible, what is returned, or what permissions are required for adding elements.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

A single, front-loaded sentence with no wasted words. It is appropriately concise, though for a nine-parameter mutation tool it provides minimal structure beyond the bare statement.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given nine parameters, no annotations, and no output schema, the description is too thin. It omits prerequisites, return behavior, and how this tool relates to siblings needed before or after adding an element.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so all nine parameters are already documented with descriptions, including the elementType enum. The description's examples ('task, gateway, event, etc.') add minimal meaning beyond the schema, fitting the baseline 3 for high schema coverage.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb and resource ('Add an element') and clarifies the context with examples ('task, gateway, event, etc.'). However, it does not distinguish this tool from siblings such as create_bpmn_diagram, connect_bpmn_elements, or list_bpmn_elements.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description gives no explicit when-to-use, when-not-to-use, or alternative-tool guidance. The schema mentions create_bpmn_diagram for diagramId, but that is structured field context, not description-level guidance.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Deploy Server