camunda-mcp

camunda-mcp

MCP server for modeling Camunda 7 BPMN diagrams programmatically, including elements, flows, and Camunda extensions.

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camunda-mcp

MCP server (Model Context Protocol) com ferramentas para modelar BPMN Camunda 7, em Node.js, independente do Camunda Modeler.

Construído sobre bpmn-moddle e camunda-bpmn-moddle, os mesmos módulos do projeto bpmn-js — então o XML gerado é 100% compatível com o Camunda Modeler / bpmn-js. Layout/DI é regenerado pelo bpmn-auto-layout.

Namespace de extensão usada: http://camunda.org/schema/1.0/bpmn (Camunda 7).


Instalação

git clone https://github.com/fssou/camunda-mcp.git
cd camunda-mcp
npm install
npm run build

Uso em clientes MCP

Claude Desktop / Cursor / Continue (stdio)

Adicione no mcpServers do seu cliente:

{
  "mcpServers": {
    "camunda7": {
      "command": "node",
      "args": ["/caminho/absoluto/para/camunda-mcp/dist/index.js"]
    }
  }
}

Após salvar, o cliente lista todas as ferramentas (~40) prefixadas com camunda7.

Execução standalone (debug)

node dist/index.js
# imprime no stderr: "@fssou/camunda-mcp v0.1.0 ready on stdio"
# espera mensagens MCP JSON-RPC em stdin

Ferramentas disponíveis

Ciclo de vida do diagrama

Tool Descrição
create_diagram Cria um novo diagrama em memória. Retorna diagramId.
list_diagrams Lista diagramas abertos.
delete_diagram Descarta um diagrama.
load_diagram_xml Importa um XML BPMN 2.0.
load_diagram_file Importa um arquivo .bpmn do disco.
get_diagram_xml Serializa para XML.
save_diagram Grava .bpmn em disco.
auto_layout Regenera bpmndi:BPMNDiagram (shapes/edges) via bpmn-auto-layout.
validate_diagram Lista erros/warnings estruturais.

Elementos BPMN

Tool Descrição
add_start_event StartEvent (`none
add_end_event EndEvent (`none
add_intermediate_event IntermediateCatchEvent / IntermediateThrowEvent.
add_boundary_event BoundaryEvent anexado a uma atividade (interrupting ou não).
add_task Task / UserTask / ServiceTask / SendTask / ReceiveTask / ScriptTask / BusinessRuleTask / ManualTask.
add_gateway Exclusive / Parallel / Inclusive / EventBased / Complex.
add_subprocess SubProcess / Transaction / AdHocSubProcess (event sub-process via triggeredByEvent).
add_call_activity CallActivity (calledElement).
add_text_annotation Anotação de texto.
delete_element Remove o elemento e os fluxos incidentes.
list_elements Lista elementos (filtros por tipo / parentId).
get_element Inspeciona um elemento e suas extensões Camunda.
set_name, set_documentation Mutações genéricas.

Fluxos

Tool Descrição
connect_elements Cria um bpmn:SequenceFlow (com conditionExpression opcional).
add_message_flow Cria um bpmn:MessageFlow entre participants.
add_association Cria uma bpmn:Association (anotação ↔ elemento).
set_default_flow Marca um fluxo como default de um gateway/atividade.
set_condition_expression Define um bpmn:FormalExpression em um fluxo.

Pools e lanes

Tool Descrição
add_participant Cria um Participant (pool) — promove o diagrama para bpmn:Collaboration.
add_lane Cria uma Lane em um Participant.
assign_to_lane Adiciona um flow node a uma lane (flowNodeRef).

Extensões Camunda 7

Tool Descrição
set_task_implementation class, expression (+ resultVariable), delegateExpression, external (topic).
set_async asyncBefore, asyncAfter, exclusive, jobPriority.
set_user_task_assignment assignee, candidateUsers, candidateGroups, dueDate, followUpDate, priority.
set_form formKey ou formRef + camunda:FormData/FormField embutido.
set_io_mapping camunda:InputOutput com camunda:InputParameter / camunda:OutputParameter (value ou camunda:Script).
set_camunda_properties Substitui camunda:Properties.
add_execution_listener Anexa camunda:ExecutionListener (`start
add_task_listener Anexa camunda:TaskListener (`create
set_error_event_definition Configura bpmn:ErrorEventDefinition + bpmn:Error + camunda:errorCodeVariable/errorMessageVariable.
set_timer_event_definition timeDuration / timeCycle / timeDate (FormalExpression).
set_message_event_definition Cria/reusa bpmn:Message e seta messageRef.
set_signal_event_definition Cria/reusa bpmn:Signal e seta signalRef.
set_process_attributes id, name, isExecutable, camunda:versionTag, camunda:historyTimeToLive, camunda:jobPriority, camunda:candidateStarterUsers/Groups, camunda:isStartableInTasklist.

Exemplo de fluxo

Após o cliente MCP chamar as ferramentas, o XML produzido tem o seguinte formato (Camunda 7 plenamente válido):

<bpmn:definitions xmlns:bpmn="..." xmlns:camunda="http://camunda.org/schema/1.0/bpmn">
  <bpmn:process id="Approval_Process" isExecutable="true"
                camunda:versionTag="1.0.0" camunda:historyTimeToLive="P30D">
    <bpmn:startEvent id="Event_..." name="Pedido recebido" />
    <bpmn:userTask id="Activity_..." name="Aprovar pedido"
                   camunda:candidateGroups="gerentes" camunda:dueDate="P1D"
                   camunda:asyncBefore="true" camunda:exclusive="true"
                   camunda:formKey="embedded:app:forms/approve.html" />
    <bpmn:exclusiveGateway id="Gateway_..." name="Aprovado?" />
    <bpmn:serviceTask id="Activity_..." name="Faturar"
                      camunda:delegateExpression="${invoiceService}">
      <bpmn:extensionElements>
        <camunda:inputOutput>
          <camunda:inputParameter name="orderId">${execution.getVariable("orderId")}</camunda:inputParameter>
          <camunda:outputParameter name="invoiceId">${result.id}</camunda:outputParameter>
        </camunda:inputOutput>
        <camunda:properties>
          <camunda:property name="retries" value="5" />
        </camunda:properties>
        <camunda:executionListener event="end" expression="${endListener.notify(execution)}" />
      </bpmn:extensionElements>
    </bpmn:serviceTask>
    <bpmn:endEvent id="Event_..." name="Pedido recusado">
      <bpmn:errorEventDefinition errorRef="Error_PEDIDO_RECUSADO" />
    </bpmn:endEvent>
    <bpmn:sequenceFlow id="Flow_..." name="Aprovado" sourceRef="Gateway_..." targetRef="Activity_...">
      <bpmn:conditionExpression>${approved}</bpmn:conditionExpression>
    </bpmn:sequenceFlow>
  </bpmn:process>
  <bpmn:error id="Error_PEDIDO_RECUSADO" name="Pedido recusado" errorCode="PEDIDO_RECUSADO" />
</bpmn:definitions>

Use auto_layout para regenerar bpmndi:BPMNDiagram quando o diagrama mudar.


Desenvolvimento

npm install
npm run build         # compila TS → dist/
npm run typecheck     # tsc --noEmit
npm run lint          # eslint
npm test              # vitest (smoke end-to-end)
npm run dev           # roda src/index.ts via tsx (stdio)

A árvore do projeto:

src/
├── index.ts              # stdio entrypoint
├── server.ts             # buildServer() — factory de McpServer
├── store.ts              # DiagramStore + DiagramSession
├── bpmn/
│   ├── moddle.ts         # cria BpmnModdle com camunda 7 descriptor
│   ├── builder.ts        # BpmnBuilder — adiciona/remove elementos
│   ├── camunda.ts        # helpers de extensões Camunda 7
│   ├── layout.ts         # wrapper de bpmn-auto-layout
│   ├── validate.ts       # validateDiagram()
│   ├── xml.ts            # fromXML / toXML / indexById
│   └── types.ts          # uniões discriminadas de tipos BPMN
└── tools/
    ├── registry.ts       # schemas Zod por tool
    └── handlers.ts       # dispatch(toolName, params)
test/
└── smoke.test.ts         # end-to-end: criação → exportação → auto-layout → round-trip

Licença

MIT — veja LICENSE.

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