build_and_push_image_to_ecr

THE RISK

High Risk

Why build_and_push_image_to_ecr needs a policy

Building and pushing Docker images are Execute operations: they trigger external build systems and modify remote infrastructure state. While the description is empty, the tool name clearly indicates code execution (build) combined with remote state modification (push to ECR).

From the tool's definition Tool name 'build_and_push_image_to_ecr' indicates executing a container image build process and pushing to AWS ECR (Elastic Container Registry). This involves running build operations and modifying a remote registry.

Documented attack patterns abuse exactly the kind of access build_and_push_image_to_ecr gives an agent:

POLICY

How to control build_and_push_image_to_ecr

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 build_and_push_image_to_ecr:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "build_and_push_image_to_ecr": {
      "limits": [
        {
          "counter": "build_and_push_image_to_ecr_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

build_and_push_image_to_ecr 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.

Create a free account and register AWS AppSync MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

Govern code and CI agents → Branch allowlists, approval on merges, and rate caps on the build and pipeline tools agents trigger.
High-risk tools in AWS AppSync MCP Server → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Agent sandbox → Bounding what an agent can execute and where the boundary should sit.
Least privilege for MCP → Granting agents the minimum tool surface the task needs.
Rate Limiting MCP Tool Calls: A Practical Guide →
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PolicyLayer vs alternatives → How deterministic, per-call MCP policy compares with gateways, identity layers, and authorisation platforms.

FAQ

Questions about build_and_push_image_to_ecr

What does the build_and_push_image_to_ecr tool do? +

build_and_push_image_to_ecr. 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.

How do I enforce a policy on build_and_push_image_to_ecr? +

Register the AWS AppSync MCP Server MCP server in PolicyLayer and add a rule for build_and_push_image_to_ecr: 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.

What risk level is build_and_push_image_to_ecr? +

build_and_push_image_to_ecr is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit build_and_push_image_to_ecr? +

Yes. Add a rate_limit block to the build_and_push_image_to_ecr 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.

How do I block build_and_push_image_to_ecr completely? +

Set action: deny in the PolicyLayer policy for build_and_push_image_to_ecr. 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.

What MCP server provides build_and_push_image_to_ecr? +

build_and_push_image_to_ecr 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.

Enforce policy on every AWS AppSync MCP Server tool call.

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.

CHECK YOUR STACK →