AI agents invoke start-migration to trigger actions in AWS AppSync MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.
Migration operations typically trigger long-running processes that execute transformations on data or infrastructure. While reversibility is often possible, the scope and complexity of a migration make it an Execute-category risk rather than Write. If this tool executes arbitrary migrations without constraints, misuse could cause significant operational disruption.
From the tool's definition Tool name 'start-migration' suggests initiating a migration operation, which implies executing a process with external side effects. Description is empty, limiting certainty.
Documented attack patterns abuse exactly the kind of access start-migration gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and AWS AppSync MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for start-migration:
{
"version": "1",
"default": "deny",
"tools": {
"start-migration": {
"limits": [
{
"counter": "start-migration_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}start-migration stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.
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start-migration. It is categorised as a Execute tool in the AWS AppSync MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the AWS AppSync MCP Server MCP server in PolicyLayer and add a rule for start-migration: 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 AWS AppSync MCP Server. Nothing to install.
start-migration is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the start-migration 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 start-migration. 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.
start-migration is provided by the AWS AppSync MCP Server MCP server (awslabs.aws-appsync-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from AWS AppSync 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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805 AWS AppSync MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.