MCP Server
Flowgraf
in.flowgraf/flowgraf
What this MCP does
Creates and edits architecture diagrams from infrastructure graphs and returns editable canvases, SVGs, and Mermaid representations.
Capabilities
Tools
3
tools
create_diagram
Create architecture diagram
Create a NEW architecture diagram from a graph that YOU author, and get back a shareable, editable canvas URL plus a rendered SVG and Mermaid.
You produce only the SEMANTICS â nodes, the groups (VPC/cluster/...) they live in, and the directed edges between them. You do NOT lay anything out: never send x/y/position/pinned. A deterministic layout engine computes all geometry and an icon layer picks the pictures from each node's kind.
kind.catalog is one of aws | gcp | azure | k8s | saas | generic, each with rich per-catalog kind.types (e.g. aws:lambda, gcp:bigquery, azure:cosmos_db, k8s:deployment, saas:kafka):
- "aws" (api_gateway, lambda, s3, rds, dynamodb, sqs, bedrock, kinesis, fargate, eventbridge, aurora, ...).
- "gcp" (compute_engine, gke, cloud_run, cloud_sql, spanner, firestore, bigquery, pubsub, dataflow, vertex_ai, ...).
- "azure" (virtual_machine, aks, app_service, functions, blob_storage, sql_database, cosmos_db, service_bus, event_hubs, key_vault, ...).
- "k8s" (pod, deployment, statefulset, daemonset, job, cronjob, service, ingress, configmap, secret, hpa, ...).
- "saas" for hosted third-parties (redis, postgresql, mysql, mongodb, kafka, stripe, twilio, auth0, github, cloudflare, ...).
- "generic" primitive when nothing branded fits: service, database, cache, queue, user, external_system, storage, gateway, function, note.
- "generic" FLOWCHART kinds for processes/flowcharts: process, decision, terminator, data, document, subprocess.
edge.kind is one of: request, response, async_event, data_flow, dependency, network, generic.
WORKED EXAMPLE â a user hitting an API in a VPC that talks to Postgres:
{
"title": "Web API",
"domain": "cloud_architecture",
"graph": {
"groups": [{ "id": "g_vpc", "label": "VPC", "type": "vpc" }],
"nodes": [
{ "id": "n_user", "label": "User", "kind": { "catalog": "generic", "type": "user" } },
{ "id": "n_api", "label": "API", "kind": { "catalog": "aws", "type": "api_gateway" }, "parentId": "g_vpc" },
{ "id": "n_db", "label": "Postgres", "kind": { "catalog": "aws", "type": "rds" }, "parentId": "g_vpc" }
],
"edges": [
{ "id": "e1", "source": "n_user", "target": "n_api", "kind": "request" },
{ "id": "e2", "source": "n_api", "target": "n_db", "kind": "data_flow" }
]
}
}
Returns { diagramId, url, svg, mermaid, version }. Give the user the url â opening it shows the same diagram on an editable canvas (anonymous; it's theirs to claim by signing in). To change the diagram afterwards, use get_diagram then edit_diagram.
Input schema
{'type': 'object', '$schema': 'http://json-schema.org/draft-07/schema#', 'required': ['title', 'graph'], 'properties': {'graph': {'type': 'object', 'properties': {'edges': {'type': 'array', 'items': {'type': 'object', 'required': ['id', 'source', 'target', 'kind'], 'properties': {'id': {'type': 'string', 'minLength': 1}, 'kind': {'enum': ['request', 'response', 'async_event', 'data_flow', 'dependency', 'network', 'generic'], 'type': 'string'}, 'label': {'type': 'string'}, 'source': {'type': 'string', 'minLength': 1, 'description': 'id of the source node.'}, 'target': {'type': 'string', 'minLength': 1, 'description': 'id of the target node.'}, 'directed': {'type': 'boolean'}}, 'additionalProperties': False}, 'description': 'Directed connections between node ids.'}, 'nodes': {'type': 'array', 'items': {'type': 'object', 'required': ['id', 'label', 'kind'], 'properties': {'id': {'type': 'string', 'minLength': 1, 'description': 'Stable snake_case id you assign, e.g. n_api. Referenced by edges.'}, 'kind': {'type': 'object', 'required': ['catalog', 'type'], 'properties': {'type': {'type': 'string', 'minLength': 1, 'description': 'Catalog-specific type, e.g. api_gateway, rds, redis, service.'}, 'catalog': {'enum': ['aws', 'gcp', 'azure', 'k8s', 'saas', 'generic'], 'type': 'string'}}, 'additionalProperties': False}, 'label': {'type': 'string', 'description': "Human label shown on the node, e.g. 'API Gateway'."}, 'parentId': {'type': 'string', 'minLength': 1, 'description': 'id of the group this node lives in (a VPC, cluster, ...).'}}, 'additionalProperties': False}, 'description': 'The nodes (services, databases, users, ...).'}, 'groups': {'type': 'array', 'items': {'type': 'object', 'required': ['id', 'label', 'type'], 'properties': {'id': {'type': 'string', 'minLength': 1, 'description': 'Stable snake_case id you assign, e.g. g_vpc.'}, 'type': {'enum': ['vpc', 'subnet', 'availability_zone', 'region', 'cluster', 'trust_boundary', 'logical'], 'type': 'string'}, 'label': {'type': 'string'}, 'style': {'type': 'object', 'properties': {'color': {'type': 'string'}, 'dashed': {'type': 'boolean'}}, 'additionalProperties': False}, 'parentId': {'type': 'string', 'minLength': 1, 'description': 'id of the parent group, for nested containers.'}}, 'additionalProperties': False}, 'description': 'Containers that nodes live in (VPCs, clusters, ...).'}}, 'additionalProperties': False}, 'title': {'type': 'string', 'minLength': 1, 'description': 'A short title for the diagram.'}, 'domain': {'enum': ['cloud_architecture', 'system_design', 'sequence', 'flow', 'generic'], 'type': 'string', 'description': 'Optional domain hint (default: generic).'}}}
edit_diagram
Edit architecture diagram
Apply a list of operations to an EXISTING diagram. The ops re-use this tool's op vocabulary; you author them, we validate + apply + re-layout + re-render.
ALWAYS call get_diagram(diagramId) first: it returns the current ids and the `version`. Pass that version as `baseVersion`. If the diagram changed since you fetched it, you get a STALE_VERSION error telling you the current version â refetch with get_diagram, recompute your ops, and retry.
The operations (each element of `ops`):
- add_node { op, node:{ id, label, kind, parentId? } }
- remove_node { op, id } (also drops edges touching the node)
- update_node { op, id, patch:{ label?, kind?, parentId?, metadata? } }
- add_edge { op, edge:{ id, source, target, kind, label?, directed? } }
- remove_edge { op, id }
- update_edge { op, id, patch:{ source?, target?, label?, kind?, directed? } }
- add_group { op, group:{ id, label, type, parentId? } }
- remove_group{ op, id }
- move_to_group { op, nodeId, groupId } (groupId null un-nests the node)
- set_layout { op, patch:{ direction?, spacing? } }
- insert_between { op, newNode:{ id, label, kind, parentId? }, sourceId, targetId, inKind?, outKind? }
insert_between IS THE KEY OP for "add X between A and B" requests. It splices newNode onto the existing AâB edge: removes that edge, adds the node, and wires AânewNodeâB so the connection re-routes through it automatically.
WORKED EXAMPLE â "add a Redis cache between the API and the DB" on the diagram above:
1) get_diagram(diagramId) â shows nodes n_api, n_db and version 1.
2) edit_diagram({ diagramId, baseVersion: 1, ops: [
{ "op": "insert_between", "sourceId": "n_api", "targetId": "n_db",
"newNode": { "id": "n_redis", "label": "Redis", "kind": { "catalog": "saas", "type": "redis" }, "parentId": "g_vpc" },
"inKind": "request", "outKind": "data_flow" }
] })
The APIâDB edge is gone and now flows APIâRedisâDB. Never send x/y/position â geometry is computed for you.
Node kinds: catalog â {aws, gcp, azure, k8s, saas, generic} with rich per-catalog types (e.g. aws:lambda, gcp:bigquery, azure:cosmos_db, k8s:deployment, saas:kafka), plus generic flowchart kinds (process, decision, terminator, data, document, subprocess).
Returns { url, svg, mermaid, appliedOps, version }.
Input schema
{'type': 'object', '$schema': 'http://json-schema.org/draft-07/schema#', 'required': ['diagramId', 'baseVersion', 'ops'], 'properties': {'ops': {'type': 'array', 'items': {'oneOf': [{'type': 'object', 'required': ['op', 'node'], 'properties': {'op': {'type': 'string', 'const': 'add_node'}, 'node': {'type': 'object', 'required': ['id', 'label', 'kind'], 'properties': {'id': {'type': 'string', 'minLength': 1}, 'kind': {'type': 'object', 'required': ['catalog', 'type'], 'properties': {'type': {'type': 'string', 'maxLength': 512, 'minLength': 1}, 'catalog': {'enum': ['aws', 'gcp', 'azure', 'k8s', 'saas', 'generic'], 'type': 'string'}}, 'additionalProperties': False}, 'label': {'type': 'string', 'maxLength': 512}, 'style': {'type': 'object', 'properties': {'bold': {'type': 'boolean'}, 'fill': {'enum': ['gray', 'slate', 'blue', 'teal', 'green', 'amber', 'orange', 'red', 'pink', 'violet'], 'type': 'string'}, 'border': {'enum': ['gray', 'slate', 'blue', 'teal', 'green', 'amber', 'orange', 'red', 'pink', 'violet'], 'type': 'string'}, 'textSize': {'enum': ['s', 'm', 'l'], 'type': 'string'}}, 'additionalProperties': False}, 'metadata': {'type': 'object', 'propertyNames': {'type': 'string', 'maxLength': 256}, 'additionalProperties': {}}, 'parentId': {'type': 'string', 'minLength': 1}}, 'additionalProperties': False}}, 'additionalProperties': False}, {'type': 'object', 'required': ['op', 'id'], 'properties': {'id': {'type': 'string', 'minLength': 1}, 'op': {'type': 'string', 'const': 'remove_node'}}, 'additionalProperties': False}, {'type': 'object', 'required': ['op', 'id', 'patch'], 'properties': {'id': {'type': 'string', 'minLength': 1}, 'op': {'type': 'string', 'const': 'update_node'}, 'patch': {'type': 'object', 'properties': {'kind': {'type': 'object', 'required': ['catalog', 'type'], 'properties': {'type': {'type': 'string', 'maxLength': 512, 'minLength': 1}, 'catalog': {'enum': ['aws', 'gcp', 'azure', 'k8s', 'saas', 'generic'], 'type': 'string'}}, 'additionalProperties': False}, 'label': {'type': 'string', 'maxLength': 512}, 'style': {'type': 'object', 'properties': {'bold': {'type': 'boolean'}, 'fill': {'enum': ['gray', 'slate', 'blue', 'teal', 'green', 'amber', 'orange', 'red', 'pink', 'violet'], 'type': 'string'}, 'border': {'enum': ['gray', 'slate', 'blue', 'teal', 'green', 'amber', 'orange', 'red', 'pink', 'violet'], 'type': 'string'}, 'textSize': {'enum': ['s', 'm', 'l'], 'type': 'string'}}, 'additionalProperties': False}, 'metadata': {'type': 'object', 'propertyNames': {'type': 'string', 'maxLength': 256}, 'additionalProperties': {}}, 'parentId': {'type': 'string', 'minLength': 1}}, 'additionalProperties': False}}, 'additionalProperties': False}, {'type': 'object', 'required': ['op', 'edge'], 'properties': {'op': {'type': 'string', 'const': 'add_edge'}, 'edge': {'type': 'object', 'required': ['id', 'source', 'target', 'kind'], 'properties': {'id': {'type': 'string', 'minLength': 1}, 'kind': {'enum': ['request', 'response', 'async_event', 'data_flow', 'dependency', 'network', 'generic'], 'type': 'string'}, 'label': {'type': 'string', 'maxLength': 512}, 'style': {'type': 'object', 'properties': {'bold': {'type': 'boolean'}, 'color': {'enum': ['gray', 'slate', 'blue', 'teal', 'green', 'amber', 'orange', 'red', 'pink', 'violet'], 'type': 'string'}, 'width': {'enum': ['thin', 'normal', 'thick'], 'type': 'string'}, 'textSize': {'enum': ['s', 'm', 'l'], 'type': 'string'}}, 'additionalProperties': False}, 'source': {'type': 'string', 'minLength': 1}, 'target': {'type': 'string', 'minLength': 1}, 'directed': {'type': 'boolean'}}, 'additionalProperties': False}}, 'additionalProperties': False}, {'type': 'object', 'required': ['op', 'id'], 'properties': {'id': {'type': 'string', 'minLength': 1}, 'op': {'type': 'string', 'const': 'remove_edge'}}, 'additionalProperties': False}, {'type': 'object', 'required': ['op', 'id', 'patch'], 'properties': {'id': {'type': 'string', 'minLength': 1}, 'op': {'type': 'string', 'const': 'update_edge'}, 'patch': {'type': 'object', 'properties': {'kind': {'enum': ['request', 'response', 'async_event', 'data_flow', 'dependency', 'network', 'generic'], 'type': 'string'}, 'label': {'type': 'string', 'maxLength': 512}, 'style': {'type': 'object', 'properties': {'bold': {'type': 'boolean'}, 'color': {'enum': ['gray', 'slate', 'blue', 'teal', 'green', 'amber', 'orange', 'red', 'pink', 'violet'], 'type': 'string'}, 'width': {'enum': ['thin', 'normal', 'thick'], 'type': 'string'}, 'textSize': {'enum': ['s', 'm', 'l'], 'type': 'string'}}, 'additionalProperties': False}, 'source': {'type': 'string', 'minLength': 1}, 'target': {'type': 'string', 'minLength': 1}, 'directed': {'type': 'boolean'}}, 'additionalProperties': False}}, 'additionalProperties': False}, {'type': 'object', 'required': ['op', 'group'], 'properties': {'op': {'type': 'string', 'const': 'add_group'}, 'group': {'type': 'object', 'required': ['id', 'label', 'type'], 'properties': {'id': {'type': 'string', 'minLength': 1}, 'type': {'enum': ['vpc', 'subnet', 'availability_zone', 'region', 'cluster', 'trust_boundary', 'logical'], 'type': 'string'}, 'label': {'type': 'string', 'maxLength': 512}, 'style': {'type': 'object', 'properties': {'color': {'enum': ['gray', 'slate', 'blue', 'teal', 'green', 'amber', 'orange', 'red', 'pink', 'violet'], 'type': 'string'}, 'dashed': {'type': 'boolean'}}, 'additionalProperties': False}, 'parentId': {'type': 'string', 'minLength': 1}}, 'additionalProperties': False}}, 'additionalProperties': False}, {'type': 'object', 'required': ['op', 'id'], 'properties': {'id': {'type': 'string', 'minLength': 1}, 'op': {'type': 'string', 'const': 'remove_group'}}, 'additionalProperties': False}, {'type': 'object', 'required': ['op', 'id', 'patch'], 'properties': {'id': {'type': 'string', 'minLength': 1}, 'op': {'type': 'string', 'const': 'update_group'}, 'patch': {'type': 'object', 'properties': {'type': {'enum': ['vpc', 'subnet', 'availability_zone', 'region', 'cluster', 'trust_boundary', 'logical'], 'type': 'string'}, 'label': {'type': 'string', 'maxLength': 512}, 'style': {'type': 'object', 'properties': {'color': {'enum': ['gray', 'slate', 'blue', 'teal', 'green', 'amber', 'orange', 'red', 'pink', 'violet'], 'type': 'string'}, 'dashed': {'type': 'boolean'}}, 'additionalProperties': False}}, 'additionalProperties': False}}, 'additionalProperties': False}, {'type': 'object', 'required': ['op', 'nodeId', 'groupId'], 'properties': {'op': {'type': 'string', 'const': 'move_to_group'}, 'nodeId': {'type': 'string', 'minLength': 1}, 'groupId': {'anyOf': [{'type': 'string', 'minLength': 1}, {'type': 'null'}]}}, 'additionalProperties': False}, {'type': 'object', 'required': ['op', 'patch'], 'properties': {'op': {'type': 'string', 'const': 'set_layout'}, 'patch': {'type': 'object', 'properties': {'engine': {'enum': ['elk', 'dagre'], 'type': 'string'}, 'spacing': {'type': 'object', 'properties': {'node': {'type': 'number', 'maximum': 10000, 'minimum': 0}, 'layer': {'type': 'number', 'maximum': 10000, 'minimum': 0}}, 'additionalProperties': False}, 'direction': {'enum': ['TB', 'LR', 'BT', 'RL'], 'type': 'string'}}, 'additionalProperties': False}}, 'additionalProperties': False}, {'type': 'object', 'required': ['op', 'patch'], 'properties': {'op': {'type': 'string', 'const': 'set_theme'}, 'patch': {'type': 'object', 'properties': {'mode': {'enum': ['light', 'dark', 'blueprint'], 'type': 'string'}, 'styleMode': {'enum': ['plain', 'shadow'], 'type': 'string'}, 'background': {'enum': ['dots', 'grid', 'plain'], 'type': 'string'}}, 'additionalProperties': False}}, 'additionalProperties': False}, {'type': 'object', 'required': ['op', 'title'], 'properties': {'op': {'type': 'string', 'const': 'set_title'}, 'title': {'type': 'string', 'maxLength': 256, 'minLength': 1}}, 'additionalProperties': False}, {'type': 'object', 'required': ['op', 'newNode', 'sourceId', 'targetId'], 'properties': {'op': {'type': 'string', 'const': 'insert_between'}, 'inKind': {'enum': ['request', 'response', 'async_event', 'data_flow', 'dependency', 'network', 'generic'], 'type': 'string'}, 'newNode': {'type': 'object', 'required': ['id', 'label', 'kind'], 'properties': {'id': {'type': 'string', 'minLength': 1}, 'kind': {'type': 'object', 'required': ['catalog', 'type'], 'properties': {'type': {'type': 'string', 'maxLength': 512, 'minLength': 1}, 'catalog': {'enum': ['aws', 'gcp', 'azure', 'k8s', 'saas', 'generic'], 'type': 'string'}}, 'additionalProperties': False}, 'label': {'type': 'string', 'maxLength': 512}, 'style': {'type': 'object', 'properties': {'bold': {'type': 'boolean'}, 'fill': {'enum': ['gray', 'slate', 'blue', 'teal', 'green', 'amber', 'orange', 'red', 'pink', 'violet'], 'type': 'string'}, 'border': {'enum': ['gray', 'slate', 'blue', 'teal', 'green', 'amber', 'orange', 'red', 'pink', 'violet'], 'type': 'string'}, 'textSize': {'enum': ['s', 'm', 'l'], 'type': 'string'}}, 'additionalProperties': False}, 'metadata': {'type': 'object', 'propertyNames': {'type': 'string', 'maxLength': 256}, 'additionalProperties': {}}, 'parentId': {'type': 'string', 'minLength': 1}}, 'additionalProperties': False}, 'outKind': {'enum': ['request', 'response', 'async_event', 'data_flow', 'dependency', 'network', 'generic'], 'type': 'string'}, 'sourceId': {'type': 'string', 'minLength': 1}, 'targetId': {'type': 'string', 'minLength': 1}}, 'additionalProperties': False}]}}, 'diagramId': {'type': 'string', 'minLength': 1, 'description': 'The diagram to edit (from create_diagram or get_diagram).'}, 'baseVersion': {'type': 'integer', 'maximum': 9007199254740991, 'minimum': 1, 'description': 'The version you are editing against â\x80\x94 get it from get_diagram. Stale â\x86\x92 STALE_VERSION.'}}}
get_diagram
Get architecture diagram
Fetch a diagram's raw IR (nodes, groups, edges with their real ids) and its current `version`. Call this before edit_diagram so your ops reference ids that actually exist and you pass the correct baseVersion. Returns { diagram, version }.
Input schema
{'type': 'object', '$schema': 'http://json-schema.org/draft-07/schema#', 'required': ['diagramId'], 'properties': {'diagramId': {'type': 'string', 'minLength': 1, 'description': 'The diagram to fetch.'}}}
History
Recent tool changes
Added
get_diagram
Sept. 17, 2026, 12:39 p.m.
Added
edit_diagram
Sept. 17, 2026, 12:39 p.m.
Added
create_diagram
Sept. 17, 2026, 12:39 p.m.
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