arvan_s3_put_bucket_policy

Set a bucket's access policy (an S3 policy document).

SERVERArvanCloud MCP Server SOURCEdwin-gharibi/arvancloud-mcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/dwin-gharibi-arvancloud-mcp/arvan-s3-put-bucket-policy.md

WHAT IT DOES

What arvan_s3_put_bucket_policy does on ArvanCloud MCP Server

AI agents use arvan_s3_put_bucket_policy to create or update resources in ArvanCloud MCP Server, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your ArvanCloud MCP Server environment.

RISK

Why arvan_s3_put_bucket_policy is rated Medium

This tool modifies S3 bucket access policies, which controls who can read/write/delete objects in the bucket. While reversible, a misconfigured policy could grant excessive permissions to unauthorized parties or lock out legitimate users, representing significant blast radius. Categorized as Write rather than Execute because it sets configuration/metadata, not triggering code execution.

From the tool's definition Tool name 'arvan_s3_put_bucket_policy' and description 'Set a bucket's access policy' indicate modification of bucket configuration. The action is reversible (policies can be updated or removed), not destructive.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs arvan_s3_put_bucket_policy safely

PolicyLayer is an MCP gateway: it sits between your AI agents and ArvanCloud MCP Server, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For arvan_s3_put_bucket_policy, this is the rule to start with:

arvan_s3_put_bucket_policy Rate-limited

arvan_s3_put_bucket_policy 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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "arvan_s3_put_bucket_policy": {
      "limits": [
        {
          "counter": "arvan_s3_put_bucket_policy_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect ArvanCloud MCP Server, apply this rule, and every arvan_s3_put_bucket_policy call is checked against it from then on.

FAQ

Questions about arvan_s3_put_bucket_policy

What does the arvan_s3_put_bucket_policy tool do? +

Set a bucket's access policy (an S3 policy document). It is categorised as a Write tool in the ArvanCloud MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on arvan_s3_put_bucket_policy? +

Register the ArvanCloud MCP Server MCP server in PolicyLayer and add a rule for arvan_s3_put_bucket_policy: 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 ArvanCloud MCP Server. Nothing to install.

What risk level is arvan_s3_put_bucket_policy? +

arvan_s3_put_bucket_policy is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit arvan_s3_put_bucket_policy? +

Yes. Add a rate_limit block to the arvan_s3_put_bucket_policy 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 arvan_s3_put_bucket_policy completely? +

Set action: deny in the PolicyLayer policy for arvan_s3_put_bucket_policy. 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 arvan_s3_put_bucket_policy? +

arvan_s3_put_bucket_policy is provided by the ArvanCloud MCP Server MCP server (dwin-gharibi/arvancloud-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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