gcp_kms_decrypt

Decrypt data using a Cloud KMS key

SERVERGCP MCP Server SOURCEahmedselimmansor-ctrl/gcp_mcp_server

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/ahmedselimmansor-ctrl-gcp-mcp-server/gcp-kms-decrypt.md

WHAT IT DOES

What gcp_kms_decrypt does on GCP MCP Server

AI agents call gcp_kms_decrypt to retrieve information from GCP MCP Server without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why gcp_kms_decrypt is rated Low

Decryption is fundamentally a read operation—it retrieves plaintext from ciphertext without altering stored data or triggering external operations. However, severity is elevated to 'medium' rather than 'low' because unauthorized decryption of sensitive data (credentials, PII, secrets) could lead to significant information disclosure.

From the tool's definition Tool name 'gcp_kms_decrypt' and description 'Decrypt data using a Cloud KMS key' indicate data retrieval/transformation without modification or deletion of underlying resources.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs gcp_kms_decrypt safely

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

gcp_kms_decrypt Allowed

gcp_kms_decrypt is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "gcp_kms_decrypt": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

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

FAQ

Questions about gcp_kms_decrypt

What does the gcp_kms_decrypt tool do? +

Decrypt data using a Cloud KMS key. It is categorised as a Read tool in the GCP MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on gcp_kms_decrypt? +

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

What risk level is gcp_kms_decrypt? +

gcp_kms_decrypt is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit gcp_kms_decrypt? +

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

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

gcp_kms_decrypt is provided by the GCP MCP Server MCP server (ahmedselimmansor-ctrl/gcp_mcp_server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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