finch_create_ecr_repo
AI agents use finch_create_ecr_repo to create or update resources in AWS — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your AWS environment.
Creating an ECR repository is a reversible write operation—repositories can be deleted if created in error. While it does create cloud infrastructure, it does not execute arbitrary code, delete data, or handle financial transactions. Severity is medium because uncontrolled repository creation could lead to resource sprawl and unexpected AWS costs, but the impact is limited compared to execute or destructive actions.
From the tool's definition Tool name 'finch_create_ecr_repo' indicates it creates an AWS ECR (Elastic Container Registry) repository. The verb 'create' and the absence of destructive language suggest this is a write operation that creates a new resource.
Documented attack patterns abuse exactly the kind of access finch_create_ecr_repo gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and AWS, and nothing reaches the server without passing your rules. This is the rule we recommend for finch_create_ecr_repo:
{
"version": "1",
"default": "deny",
"tools": {
"finch_create_ecr_repo": {
"limits": [
{
"counter": "finch_create_ecr_repo_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}finch_create_ecr_repo 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.
Free to start. No card required.
finch_create_ecr_repo. It is categorised as a Write tool in the AWS MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the AWS MCP server in PolicyLayer and add a rule for finch_create_ecr_repo: 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. Nothing to install.
finch_create_ecr_repo 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 finch_create_ecr_repo 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 finch_create_ecr_repo. 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.
finch_create_ecr_repo is provided by the AWS MCP server (@awslabs/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from AWS, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
300 AWS tools catalogued and risk-classified — across an index of 43,000+ MCP servers.