Post a new tweet with attached media (images/videos). Twitter limitations: max 4 images OR 1 video per tweet (cannot mix types).
AI agents use sendTweetWithMedia to create or update resources in Twitter Client MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Twitter Client MCP environment.
This tool creates new tweets with media attachments, which is a reversible Write operation. It modifies the user's Twitter account by publishing content but does not execute arbitrary code, delete data, or move money. The severity is medium because misuse could result in unintended public posts that damage reputation or spread misinformation, but the action can be undone by deleting the tweet afterward.
From the tool's definition Tool description states 'Post a new tweet with attached media', which is a create/modify operation that adds new content to Twitter.
Documented attack patterns abuse exactly the kind of access sendTweetWithMedia gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Twitter Client MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for sendTweetWithMedia:
{
"version": "1",
"default": "deny",
"tools": {
"sendTweetWithMedia": {
"limits": [
{
"counter": "sendtweetwithmedia_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}sendTweetWithMedia 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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Post a new tweet with attached media (images/videos). Twitter limitations: max 4 images OR 1 video per tweet (cannot mix types). It is categorised as a Write tool in the Twitter Client MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Twitter Client MCP server in PolicyLayer and add a rule for sendTweetWithMedia: 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 Twitter Client MCP. Nothing to install.
sendTweetWithMedia 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 sendTweetWithMedia 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 sendTweetWithMedia. 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.
sendTweetWithMedia is provided by the Twitter Client MCP server (mzkrasner/twitter-client-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Twitter Client MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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20 Twitter Client MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.