addComment

SERVERGoogle Drive SOURCE@ark7/google-drive-mcp

Medium RISK CLASS

Category Write

Parameters 82 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/ark7-google-drive-mcp/addcomment.md

WHAT IT DOES

What addComment does on Google Drive

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

Parameter	Type	Required	Description
`tabId`	string	—	Tab ID for multi-tab documents (defaults to the document body)
`account`	string	—	Alias of the Google account to target. Optional — defaults to the session/global default account, or the sole authenticated account. Run manage_accounts list to
`endIndex`	number	—	End index (exclusive; or use textToFind)
`documentId`	string	Yes	The document ID
`startIndex`	number	—	Start index (1-based; or use textToFind)
`textToFind`	string	—	Quote this exact text instead of using indices (case-sensitive)
`commentText`	string	Yes	The comment content
`matchInstance`	number	—	Which occurrence of textToFind to quote (1-based, default 1)

Parameters from the server's own tool schema.

RISK

Why addComment is rated Medium

An AI agent can call addComment faster than any human can review: one bad instruction and it creates or modifies resources in Google Drive by the hundred, each call as confident as the last.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs addComment safely

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

addComment Rate-limited

addComment 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": {
    "addComment": {
      "limits": [
        {
          "counter": "addcomment_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 Google Drive, apply this rule, and every addComment call is checked against it from then on.

FAQ

Questions about addComment

What does the addComment tool do? +

Add a comment quoting a text range, targeted by startIndex+endIndex or by textToFind. The comment appears in the document's comment panel and records the quoted passage. Google Docs does not support margin-anchored comments through any public API, so the comment is unanchored by design; this is a platform limit, not a failure. It is categorised as a Write tool in the Google Drive MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

What parameters does addComment accept? +

addComment accepts 8 parameters: tabId, account, endIndex, documentId, startIndex, textToFind, commentText, matchInstance. Required: documentId, commentText. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on addComment? +

Register the Google Drive MCP server in PolicyLayer and add a rule for addComment: 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 Google Drive. Nothing to install.

What risk level is addComment? +

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

Can I rate-limit addComment? +

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

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

addComment is provided by the Google Drive MCP server (@ark7/google-drive-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

More on Google Drive, and thousands of servers like it.

This server

All 131 Google Drive tools →

Across the catalogue

The MCP Attack Database →

Guides

Govern customer-ops agents →Argument validation →Scoped token →