list-colors

Get color palette. Returns: event colors (1-11) and calendar colors with hex values. Use when: displaying color options for event/calendar styling. Note: colorId is string.

SERVERMCP Google Workspace SOURCE199-mcp/mcp-google

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/199-biotechnologies-mcp-google/list-colors.md

WHAT IT DOES

What list-colors does on MCP Google Workspace

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

RISK

Why list-colors is rated Low

This tool performs a read-only retrieval of static color metadata used for UI styling. It has no side effects on calendar events, contacts, emails, or any other data. The blast radius of misuse is negligible—an agent could at worst render incorrect colors, but cannot access sensitive data, modify records, or trigger unwanted actions.

From the tool's definition Tool retrieves color palette data: 'Get color palette. Returns: event colors (1-11) and calendar colors with hex values.' No modification, deletion, or execution of external operations; purely informational query about available styling options.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs list-colors safely

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

list-colors Allowed

list-colors 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": {
    "list-colors": {}
  }
}

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

The button opens the PolicyLayer dashboard: create your workspace, connect MCP Google Workspace, apply this rule, and every list-colors call is checked against it from then on.

FAQ

Questions about list-colors

What does the list-colors tool do? +

Get color palette. Returns: event colors (1-11) and calendar colors with hex values. Use when: displaying color options for event/calendar styling. Note: colorId is string. It is categorised as a Read tool in the MCP Google Workspace MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list-colors? +

Register the MCP Google Workspace MCP server in PolicyLayer and add a rule for list-colors: 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 MCP Google Workspace. Nothing to install.

What risk level is list-colors? +

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

Can I rate-limit list-colors? +

Yes. Add a rate_limit block to the list-colors 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 list-colors completely? +

Set action: deny in the PolicyLayer policy for list-colors. 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 list-colors? +

list-colors is provided by the MCP Google Workspace MCP server (199-mcp/mcp-google). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

More on MCP Google Workspace, and thousands of servers like it.

This server

All 26 MCP Google Workspace tools →

Across the catalogue

list_symbols on ACE-MCP →aiva_list_affiliates on AIVA MCP Server → The MCP Attack Database →

Guides

Roll out MCP under one policy →Data exfiltration →MCP token cost →