getDiagramImage
Render a diagram that ALREADY exists in a document to an IMAGE (svg/png/jpeg @1x/2x/3x) and return it — a temporary imageUrl available for 1 hour plus, for png/jpeg, the image inline so you can see it, and title/url citing the document the diagram lives in. Pass the diagramId (from getDocument's ...
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What getDiagramImage does on Stable Baseline
AI agents call getDiagramImage to retrieve information from Stable Baseline without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
scale | number | — | Raster resolution multiplier 1x/2x/3x (default 2). Ignored for svg. |
format | string | — | png (default) or jpeg = raster; svg is scalable. A platform default diagram's SVG contains a browser foreignObject scene, so use PNG/JPEG where foreignObject SV |
diagramId | string | Yes | The diagram's id (from getDocument markers / getDiagramInDocument). |
background | string | — | Background for png/jpeg, e.g. '#ffffff' or 'transparent' (png only). |
Parameters from the server's own tool schema.
Why getDiagramImage is rated Low
Even though getDiagramImage only reads data, uncontrolled read access leaks sensitive information and racks up API costs: an agent caught in a retry loop can make thousands of calls a minute without anyone noticing.
Attacks that exploit this kind of access
The rule that runs getDiagramImage safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Stable Baseline, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For getDiagramImage, this is the rule to start with:
getDiagramImage is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Stable Baseline, apply this rule, and every getDiagramImage call is checked against it from then on.
Questions about getDiagramImage
Render a diagram that ALREADY exists in a document to an IMAGE (svg/png/jpeg @1x/2x/3x) and return it — a temporary imageUrl available for 1 hour plus, for png/jpeg, the image inline so you can see it, and title/url citing the document the diagram lives in. Pass the diagramId (from getDocument's DIAGRAM markers or getDiagramInDocument). Reuses the diagram's cached server render when available (pixel-identical to the editor), otherwise renders from the diagram's source on the fly. Read-only: nothing in the document or the diagram is changed; the image is a temporary artefact that expires after 1 hour. Use renderDiagram instead to generate from raw DSL without an existing diagram. It is categorised as a Read tool in the Stable Baseline MCP Server, which means it retrieves data without modifying state.
getDiagramImage accepts 4 parameters: scale, format, diagramId, background. Required: diagramId. The full parameter table on this page comes from the server's own tool schema.
Register the Stable Baseline MCP server in PolicyLayer and add a rule for getDiagramImage: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Stable Baseline. Nothing to install.
getDiagramImage is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the getDiagramImage rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for getDiagramImage. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
getDiagramImage is provided by the Stable Baseline MCP server (https://api.stablebaseline.io/functions/v1/cloud-serve/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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