AI agents use unlink_entities to create or update resources in EspoCRM-MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your EspoCRM-MCP environment.
Unlinking entities removes a relationship (association) between two records in EspoCRM. This is a reversible write operation since the entities themselves are preserved and the relationship could be re-established. It does not permanently delete data, making it a Write rather than Destructive category, though misuse could disrupt important business relationships between records.
From the tool's definition 'Remove relationships between entities' — removes a link/relationship between records, but does not delete the entities themselves
Documented attack patterns abuse exactly the kind of access unlink_entities gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and EspoCRM-MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for unlink_entities:
{
"version": "1",
"default": "deny",
"tools": {
"unlink_entities": {
"limits": [
{
"counter": "unlink_entities_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}unlink_entities 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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Remove relationships between entities. It is categorised as a Write tool in the EspoCRM-MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the EspoCRM- MCP server in PolicyLayer and add a rule for unlink_entities: 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 EspoCRM-MCP. Nothing to install.
unlink_entities 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 unlink_entities 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 unlink_entities. 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.
unlink_entities is provided by the EspoCRM- MCP server (zaphod-black/espomcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 46 EspoCRM-MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
46 EspoCRM-MCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.