Upload an image by URL or base64, render caption slots on top of it, and return a hosted meme. Watermark customization is applied only for premium callers.
Risk signalsHandles credentials or secrets (apiKey) · High parameter count (12 properties)
Part of the Memesio Meme Generator server.
Free to start. No card required.
AI agents use caption_upload to create or modify resources in Memesio Meme Generator. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.
Without a policy, an AI agent could call caption_upload repeatedly, creating or modifying resources faster than any human could review. PolicyLayer's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach Memesio Meme Generator.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"caption_upload": {
"limits": [
{
"counter": "caption_upload_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Memesio Meme Generator policy for all 7 tools.
These attack patterns abuse exactly the kind of access caption_upload gives an agent. Each links to the full case and the policy that stops it:
Other write tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Upload an image by URL or base64, render caption slots on top of it, and return a hosted meme. Watermark customization is applied only for premium callers.. It is categorised as a Write tool in the Memesio Meme Generator MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Memesio Meme Generator MCP server in PolicyLayer and add a rule for caption_upload: 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 Memesio Meme Generator. Nothing to install.
caption_upload 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 caption_upload 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 caption_upload. 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.
caption_upload is provided by the Memesio Meme Generator MCP server (https://memesio.com/api/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 7 Memesio Meme Generator tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
4,600+ MCP servers and 31,000+ tools scanned and risk-classified.