AI agents use esa_create_post to create or update resources in esa MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your esa MCP Server environment.
This tool creates new data (posts/documents) in the esa system, which is a reversible write operation. It does not execute arbitrary code, delete data, or move money. The severity is medium because an AI agent could create unwanted, misleading, or spam content in a shared knowledge base, but the action is reversible through deletion or modification by authorized users.
From the tool's definition Tool name 'esa_create_post' and description 'Create a new post' directly indicate a create operation on documents/posts in the esa knowledge base system.
Documented attack patterns abuse exactly the kind of access esa_create_post gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and esa MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for esa_create_post:
{
"version": "1",
"default": "deny",
"tools": {
"esa_create_post": {
"limits": [
{
"counter": "esa_create_post_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}esa_create_post 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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Create a new post. It is categorised as a Write tool in the esa MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the esa MCP Server MCP server in PolicyLayer and add a rule for esa_create_post: 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 esa MCP Server. Nothing to install.
esa_create_post 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 esa_create_post 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 esa_create_post. 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.
esa_create_post is provided by the esa MCP Server MCP server (kajirita2002/esa-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from esa 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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9 esa MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.