io.datadef/mcp

up checked 2026-11-11T07:39:28.126Z

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Publisher-provided description

Generate, edit, and export data-architecture diagrams from your AI. Column lineage, PNG in chat.

Summary by lookupd

Creates and edits data-architecture diagrams with column-level lineage, adding nodes, zones, edges and notes, and exports them as PNG in…

Install

Claude Code, remote (streamable-http)

claude mcp add --transport http mcp https://datadef.io/mcp

Codex, remote (streamable-http)

codex mcp add mcp --url https://datadef.io/mcp

Cursor, remote (streamable-http) → .cursor/mcp.json

{
  "mcpServers": {
    "mcp": {
      "url": "https://datadef.io/mcp"
    }
  }
}

Other clients: docs. Or tell your agent: Set up lookupd for me: read https://lookupd.com/agent.md and follow it.

Tools (showing 30 of 39)

Publisher-provided text

• get_design_guide When: read once before your first canvas_* call, to build or to edit. Datadef's standard for a readable diagram (size, edge discipline, nested zones, notes) and
• canvas_describe_canvas When: Use when you want a flat list of every node, edge and zone. canvas_view shows the same ids as a zone tree with positions and defects, and is usually the b
• canvas_inspect_nodes When: Use before changing a node's fields or columns, to see everything it carries: columns, metadata, owners, neighbours. Get full detail for specific nodes:
• canvas_search_icons When: Use before adding nodes that should show a vendor logo (Snowflake, Kafka, Power BI) and you are unsure of the icon id. Find icon ids in Datadef's library
• canvas_measure_canvas When: Use only for a precise manual placement the user asked for: exact x/y/width/height per node. To check a layout, canvas_view is faster and already reports
• canvas_add_nodes When: Use to add components (tables, pipelines, sources, consumers, service icons), each placed in its zone with `group`. Add one or more nodes to the canvas.
• canvas_add_standalone_node When: Use only when the user wants a node at a specific position, outside the automatic layout. Otherwise use canvas_add_nodes. Add a single data node at an ex
• canvas_update_nodes When: Use for any in-place change: rename a node or zone (it keeps its size and contents), edit a note's text, recolour (`color: "green"`, `fill`, `family`), ch
• canvas_replace_node When: Use when one component changes identity or type (Redshift becomes Snowflake, a card becomes a service icon). The node keeps its id, connections, lineage,
• canvas_remove_nodes When: Use to delete nodes and their edges. Removing a zone keeps its contents (they move up to the parent, same place on screen): that is how to ungroup. Pass k
• canvas_connect_nodes When: Use to draw the flows that genuinely move data between two nodes. Never connect a zone: connect a node inside it. Draw edges (arrows) between nodes to sh
• canvas_update_edges When: Use to relabel, retype, restyle (dashed, colour), reverse, put arrowheads on both ends, or re-point an existing edge, instead of disconnecting and reconne
• canvas_disconnect_nodes When: Use to delete specific edges between two nodes. Remove edges, given as source and target, or as an edge id / "Source -> Target" string in `edge`. Batch:
• canvas_set_columns When: Use `mode: "merge"` to add or update (renameTo) a few columns, `mode: "remove"` to drop some, or the default replace for the full list. Columns that stay
• canvas_group_nodes When: Use to create a zone (a layer, domain, stage or boundary), nested with `parentGroup`, optionally moving existing nodes into it: the zone is drawn around t
• canvas_move_to_group When: Use to move existing nodes or zones into another zone (they are placed inside it and the zone grows to fit), or out of every zone with group null. A zone
• canvas_add_lineage When: Use to record which source columns produce which target columns. No line is drawn. Record column-level lineage: which source column produces which target
• canvas_remove_lineage When: Use to delete lineage rows between two nodes (one column pair, or all rows between them). Lineage pointing at deleted nodes or columns is cleaned automati
• canvas_add_text When: Use for a note that tells the diagram's reader a decision, constraint or gotcha. Pass `anchor` (the node or zone it explains) and it is placed beside it,
• canvas_add_shape When: Use rarely: a pointer or highlight the user asked for. Never as a backdrop; zones are the containers. Place a rectangle, circle, arrow, or line as a visu
• canvas_add_flow_arrow When: Use after the final layout, where one arrow should stand for a bundle of identical flows (zone to zone). Draw one large labelled arrow SHAPE between two
• canvas_add_region When: Use after the final layout to mark nodes that belong together without moving them into a zone. Regions do not move with layout. Draw a labelled transluce
• canvas_suggest_simplifications When: Use when the diagram feels dense or the user asks to simplify. It changes nothing; it reports what could collapse. Report where this canvas could be coll
• canvas_collapse_nodes When: Use to merge several similar nodes into one while keeping their connections, usually after canvas_suggest_simplifications. Merge several nodes into one s
• canvas_move_nodes When: Use only when the user asked for a specific placement. Moving a zone moves its children; never move the children as well. Set node positions precisely. U
• canvas_resize_nodes When: Use only when the user asked for a specific size. Set the width and height of nodes. Mostly for shapes, text boxes, and group zones — data nodes size the
• canvas_align_nodes When: Use only when the user asked for alignment that layout does not give. Align nodes to a shared edge or centre line, or space them evenly. Cleaner and far
• canvas_layout_canvas When: Use once, after the structure (zones, nodes, edges) is complete, not after each change. With no arguments it only places what was added or changed; nothin
• canvas_validate_canvas When: Use before you finish: broken references and icons, nodes outside their zone, overlapping zones or nodes. Loops are reported as information only. Check y
• canvas_view When: use to see a diagram before you edit it and after each round of changes; this is how you check your work. It answers in milliseconds from the saved diagra

Details

• Version: 1.0.0
• Transports: streamable-http
• Uptime (7 days): 100%
• Median latency: 1019 ms
• First indexed: 2026-11-01T09:02:59.934Z
• Last seen in registry: 2026-11-01T09:02:59.934Z
• Website: https://datadef.io

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