Add a comment anchored to a specific text range. Note: Due to Google API limitations, programmatic comments appear in
AI agents use addComment to create or update resources in Google Drive MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Google Drive MCP Server environment.
Adding comments to documents is a reversible write operation that modifies document content without irreversibly deleting data or executing arbitrary code. The blast radius is medium: a rogue agent could spam comments or add misleading/sensitive information to collaborative documents, but comments can be deleted and don't cause financial harm or execute system-level operations.
From the tool's definition Tool name 'addComment' and description explicitly states it 'Add[s] a comment anchored to a specific text range' — this creates new data (comments) in Google Drive documents, modifying their state reversibly.
Documented attack patterns abuse exactly the kind of access addComment gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Google Drive MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for addComment:
{
"version": "1",
"default": "deny",
"tools": {
"addComment": {
"limits": [
{
"counter": "addcomment_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}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.
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Add a comment anchored to a specific text range. Note: Due to Google API limitations, programmatic comments appear in. It is categorised as a Write tool in the Google Drive MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Google Drive MCP Server 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 MCP Server. Nothing to install.
addComment is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
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.
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.
addComment is provided by the Google Drive MCP Server MCP server (piotr-agier/google-drive-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 107 Google Drive MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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107 Google Drive MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.