Uploads an image to Ghost CMS. Accepts a remote URL, a local file path (when GHOST_MCP_IMAGE_ROOT is configured), or a base64 payload. Returns the Ghost image URL, alt text, and ref (when Ghost echoes it).
AI agents use ghost_upload_image to create or update resources in Ghost MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Ghost MCP Server environment.
This tool creates new image resources in the Ghost CMS system, which is a reversible Write operation. While images could theoretically be deleted separately, the upload action itself does not destroy data. The severity is medium because malicious image uploads could deface a blog or consume storage, but the impact is limited to media assets and can be remediated by deletion.
From the tool's definition Tool description states it "Uploads an image to Ghost CMS" and accepts multiple input formats (remote URL, local file path, base64 payload), returning the Ghost image URL.
Documented attack patterns abuse exactly the kind of access ghost_upload_image gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Ghost MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for ghost_upload_image:
{
"version": "1",
"default": "deny",
"tools": {
"ghost_upload_image": {
"limits": [
{
"counter": "ghost_upload_image_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}ghost_upload_image stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
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Uploads an image to Ghost CMS. Accepts a remote URL, a local file path (when GHOST_MCP_IMAGE_ROOT is configured), or a base64 payload. Returns the Ghost image URL, alt text, and ref (when Ghost echoes it). It is categorised as a Write tool in the Ghost MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Ghost MCP Server MCP server in PolicyLayer and add a rule for ghost_upload_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 Ghost MCP Server. Nothing to install.
ghost_upload_image is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the ghost_upload_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 ghost_upload_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.
ghost_upload_image is provided by the Ghost MCP Server MCP server (jgardner04/ghost-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Ghost MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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39 Ghost MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.