placeholder_image
Generate a placeholder image URL with custom size, colors, and text.
This record as markdown: /tools/io-github-malamutemayhem-unclick-mcp-server/placeholder-image.md
What placeholder_image does on UnClick
AI agents call placeholder_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 |
|---|---|---|---|
bg | string | — | Background hex color (default EEEEEE) |
fg | string | — | Text hex color (default 333333) |
text | string | — | Text overlay on the image |
width | number | — | Width in pixels (default 600) |
height | number | — | Height in pixels (default 400) |
Parameters from the server's own tool schema.
Why placeholder_image is rated Low
This tool retrieves or generates data (a URL for a placeholder image) without modifying, deleting, or executing external operations. It has no financial impact and causes no irreversible changes. The parameters (size, colors, text) customize the output but do not create persistence, write to systems, or execute code.
From the tool's definition Tool generates and returns a placeholder image URL with custom parameters (size, colors, text). The description indicates only retrieval/generation of a non-persistent asset with no side effects.
Attacks that exploit this kind of access
The rule that runs placeholder_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 placeholder_image, this is the rule to start with:
placeholder_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 placeholder_image call is checked against it from then on.
Questions about placeholder_image
Generate a placeholder image URL with custom size, colors, and text. It is categorised as a Read tool in the UnClick MCP Server, which means it retrieves data without modifying state.
placeholder_image accepts 5 parameters: bg, fg, text, width, height. 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 placeholder_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.
placeholder_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 placeholder_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 placeholder_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.
placeholder_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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