AI agents call get_histogram to retrieve information from Gimp without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool retrieves histogram data from an image without modifying it, which is a read operation. While the description is empty (lowering confidence slightly), the name strongly suggests querying pixel distribution data—a non-destructive, informational operation typical of GIMP's analysis features. No side effects or data modification expected.
From the tool's definition Tool name 'get_histogram' indicates data retrieval; no description provided, but histograms are typically read-only diagnostic outputs in image editors
Documented attack patterns abuse exactly the kind of access get_histogram gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Gimp, and nothing reaches the server without passing your rules. This is the rule we recommend for get_histogram:
{
"version": "1",
"default": "deny",
"tools": {
"get_histogram": {}
}
}get_histogram is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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get_histogram. It is categorised as a Read tool in the Gimp MCP Server, which means it retrieves data without modifying state.
Register the Gimp MCP server in PolicyLayer and add a rule for get_histogram: 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 Gimp. Nothing to install.
get_histogram 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 get_histogram 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 get_histogram. 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.
get_histogram is provided by the Gimp MCP server (maorcc/gimp-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Gimp, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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79 Gimp tools catalogued and risk-classified — across an index of 43,000+ MCP servers.