PlantUML MCP Server
Converts PlantUML snippets into shareable diagrams with support for capability landscapes, business scenarios, and ArchiMate diagrams. Supports HTTP, SSE, and STDIO transports for integration with Claude Desktop, Flowise, and other MCP-compatible runtimes.
Caution. Specific findings reduced this grade. They are listed on the page. Grades reflect the full trust pyramid: code, verification depth, and reputation. New projects cap at C until adoption is earned.
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sysam68
Source: Glama
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The grade above is for the source repository. Registries can serve a different version, so we mark the ones we were not able to read.
These names and descriptions are the publisher's own, read from the source code. We print them as written. Our assessment is the findings above, not this list.
generate_plantuml_diagramGenerate a PlantUML diagram with syntax validation. Returns diagram URLs on success or structured errors for auto-fix workflows.
generate_capability_landscapeGenerate an ArchiMate-based capability landscape diagram using groups, capability domains, and operational capabilities.
encode_plantumlEncode PlantUML code for usage in URLs or PlantUML servers.
decode_plantumlDecode an encoded PlantUML string back to PlantUML source.
generate_archimate_diagramGenerate an ArchiMate-compliant PlantUML diagram using stdlib templates. Provide structured elements/groups/relationships or a raw body snippet.
generate_business_scenarioBuild an ArchiMate sequence-style diagram from structured JSON describing elements and ordered interactions.
Disclosed vulnerabilities in this server's declared npm dependencies (via OSV). Whether each is reachable depends on the installed versions.
@modelcontextprotocol/sdk has cross-client data leak via shared server/transport instance reuse
Anthropic's MCP TypeScript SDK has a ReDoS vulnerability
Model Context Protocol (MCP) TypeScript SDK does not enable DNS rebinding protection by default
GENERATED_FILES_DIR📁 Fallback shared-volume export ( + PUBLIC_FILE_BASE_URL)LOG_LEVELinfo emergency → debug supportedMCP_API_KEY🔒 Optional Bearer authentication viaMCP_HOST/ MCP_PORT 0.0.0.0 / 3000 Bind address + port (HTTP/SSE)MCP_HTTP_ENABLE_JSON_RESPONSESfalse Return JSON body when true (for debugging)MCP_HTTP_PATH/mcp HTTP JSON-RPC endpointMCP_PORTMCP_HOST / 0.0.0.0 / 3000 Bind address + port (HTTP/SSE)MCP_SSE_MESSAGES_PATH/messages \MCP_SSE_PATH/sse SSE stream endpointMCP_TRANSPORTHTTP (default) Direct REST-style integration, reverse proxies, health checks =http node dist/plantuml-mcp-server.jsOB_FILE_API_BASE_URL☁️ Optional ob-file export via signed download URLs ()OB_FILE_API_TOKENunset Bearer token used to call the ob-file management APIOB_FILE_OIDC_AUDIENCEob-file Audience requested during the client-credentials token requestOB_FILE_OIDC_CLIENT_IDunset OIDC client identifier used by mcp-plantumlOB_FILE_OIDC_CLIENT_SECRETunset OIDC client secret used by mcp-plantumlOB_FILE_OIDC_DISCOVERY_URLunset Authelia OIDC discovery URL used to obtain a service access tokenOB_FILE_OIDC_FORWARDED_HOSTunset Optional X-Forwarded-Host header for internal Authelia callsOB_FILE_OIDC_FORWARDED_PROTOunset Optional X-Forwarded-Proto header for internal Authelia callsOB_FILE_OIDC_SCOPEgroups Scope requested during the client-credentials token requestOB_FILE_OIDC_TOKEN_ENDPOINTunset Optional direct token endpoint override (useful for internal service-to-service calls)PLANTUML_MCP_SKIP_AUTO_STARTunset When true, skips auto-start so scripts can import the server class without launching transportsPLANTUML_SERVER_URLOverride environment variables (, MCP_API_KEY, etc.) as needed.PUBLIC_FILE_BASE_URL📁 Fallback shared-volume export (GENERATED_FILES_DIR + )Tool annotations
No tools have read-only/destructive annotations
Add readOnlyHint or destructiveHint annotations to every tool so hosts can warn users before invoking.
All four hints declared on every tool
6/6 tools missing one or more hints — generate_plantuml_diagram (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); generate_capability_landscape (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); encode_plantuml (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint), +3 more. OpenAI's directory rejects tools where any of the four hints are missing or non-boolean.
For every tool, set all four hints (readOnlyHint, destructiveHint, idempotentHint, openWorldHint) to explicit true/false values that match the handler’s actual behaviour.
Tests exist
No test files found
Add tests that exercise each declared tool.
Production dependencies are patched
0 critical, 3 high severity in production deps — @modelcontextprotocol/sdk@1.19.1 (high), @modelcontextprotocol/sdk@1.19.1 (high)
Run npm audit fix, or upgrade the affected packages to a non-vulnerable version.
Dependency freshness
1/4 production deps stale: plantuml-encoder@2022-06-24 (4y)
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