getDiagramImage
Render a diagram that ALREADY exists in a document to an IMAGE (svg/png/jpeg @1x/2x/3x) and return it — a temporary signed URL (expires in 1 hour) plus, for png/jpeg, the image inline so you can see it. Pass the diagramId (from getDocument's DIAGRAM markers or getDiagramInDocument). Reuses the di...
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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 = vector. |
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
This tool performs a retrieval operation on existing data (diagrams) and converts it to displayable formats. There are no side effects that create, modify, delete, or execute arbitrary operations. The only data persistence mentioned ('persistedRender:true') is a repair of unrendered diagrams on read, which is a benign side effect of repair rather than destructive modification.
From the tool's definition Tool renders and retrieves an already-existing diagram to image formats (svg/png/jpeg) and returns a temporary signed URL plus inline image data.
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 signed URL (expires in 1 hour) plus, for png/jpeg, the image inline so you can see it. Pass the diagramId (from getDocument's DIAGRAM markers or getDiagramInDocument). Reuses the diagram's cached server render when available (pixel-identical to the editor); when the diagram has no cached render yet, the fresh render is persisted back to the document (persistedRender:true in the response), so reading repairs unrendered diagrams. 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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