placehold_image
Generate a placeholder image URL with custom size, colors, and text (no network call).
This record as markdown: /tools/io-github-malamutemayhem-unclick-mcp-server/placehold-image.md
What placehold_image does on UnClick
AI agents call placehold_image to retrieve information from UnClick 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 |
|---|---|---|---|
font | string | — | Font name (roboto, lato, open-sans, montserrat, etc.). |
text | string | — | Custom text overlay. |
width | number | — | Image width in pixels (default 300, max 4000). |
height | number | — | Image height in pixels (default: same as width). |
background | string | — | Background hex color (default: CCCCCC). |
foreground | string | — | Text hex color (default: 333333). |
Parameters from the server's own tool schema.
Why placehold_image is rated Low
This is a read operation—it retrieves/returns generated content (a URL string) with no irreversible changes, no code execution with external effects, no financial impact, and no destructive capability. The most severe applicable category is Read.
From the tool's definition Tool generates and returns a placeholder image URL with custom parameters (size, colors, text). The description explicitly states '(no network call)', indicating it computes or constructs a URL response without side effects or data modification.
Attacks that exploit this kind of access
The rule that runs placehold_image safely
PolicyLayer is an MCP gateway: it sits between your AI agents and UnClick, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For placehold_image, this is the rule to start with:
placehold_image 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 UnClick, apply this rule, and every placehold_image call is checked against it from then on.
Questions about placehold_image
Generate a placeholder image URL with custom size, colors, and text (no network call). It is categorised as a Read tool in the UnClick MCP Server, which means it retrieves data without modifying state.
placehold_image accepts 6 parameters: font, text, width, height, background, foreground. The full parameter table on this page comes from the server's own tool schema.
Register the UnClick MCP server in PolicyLayer and add a rule for placehold_image: 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 UnClick. Nothing to install.
placehold_image 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 placehold_image 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 placehold_image. 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.
placehold_image is provided by the UnClick MCP server (@unclick/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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